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<title>Web服務 | Go语言圣经</title>
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<div class="book" data-level="1.7" data-chapter-title="Web服務" data-filepath="ch1/ch1-07.md" data-basepath=".." data-revision="Thu Dec 31 2015 16:18:40 GMT+0800 (中国标准时间)">
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<div class="book-summary">
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<li class="chapter " data-level="0" data-path="index.html">
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前言
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<ul class="articles">
<li class="chapter " data-level="0.1" data-path="ch0/ch0-01.html">
<a href="../ch0/ch0-01.html">
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<b>0.1.</b>
Go語言起源
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<li class="chapter " data-level="0.2" data-path="ch0/ch0-02.html">
<a href="../ch0/ch0-02.html">
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<b>0.2.</b>
Go語言項目
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<li class="chapter " data-level="0.3" data-path="ch0/ch0-03.html">
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<b>0.3.</b>
本書的組織
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<b>0.4.</b>
更多的信息
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<b>0.5.</b>
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致謝
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</a>
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</ul>
</li>
<li class="chapter " data-level="1" data-path="ch1/ch1.html">
<a href="../ch1/ch1.html">
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<b>1.</b>
入門
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<li class="chapter " data-level="1.1" data-path="ch1/ch1-01.html">
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<b>1.1.</b>
Hello, World
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<li class="chapter " data-level="1.2" data-path="ch1/ch1-02.html">
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<b>1.2.</b>
命令行參數
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<b>1.3.</b>
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査找重複的行
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</a>
</li>
<li class="chapter " data-level="1.4" data-path="ch1/ch1-04.html">
<a href="../ch1/ch1-04.html">
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<b>1.4.</b>
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GIF動畵
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</a>
</li>
<li class="chapter " data-level="1.5" data-path="ch1/ch1-05.html">
<a href="../ch1/ch1-05.html">
<i class="fa fa-check"></i>
<b>1.5.</b>
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獲取URL
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</a>
</li>
<li class="chapter " data-level="1.6" data-path="ch1/ch1-06.html">
<a href="../ch1/ch1-06.html">
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<b>1.6.</b>
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併發獲取多個URL
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</a>
</li>
<li class="chapter active" data-level="1.7" data-path="ch1/ch1-07.html">
<a href="../ch1/ch1-07.html">
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<b>1.7.</b>
Web服務
</a>
</li>
<li class="chapter " data-level="1.8" data-path="ch1/ch1-08.html">
<a href="../ch1/ch1-08.html">
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<b>1.8.</b>
本章要點
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</li>
</ul>
</li>
<li class="chapter " data-level="2" data-path="ch2/ch2.html">
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<b>2.</b>
程序結構
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<ul class="articles">
<li class="chapter " data-level="2.1" data-path="ch2/ch2-01.html">
<a href="../ch2/ch2-01.html">
<i class="fa fa-check"></i>
<b>2.1.</b>
命名
</a>
</li>
<li class="chapter " data-level="2.2" data-path="ch2/ch2-02.html">
<a href="../ch2/ch2-02.html">
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<b>2.2.</b>
聲明
</a>
</li>
<li class="chapter " data-level="2.3" data-path="ch2/ch2-03.html">
<a href="../ch2/ch2-03.html">
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<b>2.3.</b>
變量
</a>
</li>
<li class="chapter " data-level="2.4" data-path="ch2/ch2-04.html">
<a href="../ch2/ch2-04.html">
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<b>2.4.</b>
賦值
</a>
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<li class="chapter " data-level="2.5" data-path="ch2/ch2-05.html">
<a href="../ch2/ch2-05.html">
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<b>2.5.</b>
類型
</a>
</li>
<li class="chapter " data-level="2.6" data-path="ch2/ch2-06.html">
<a href="../ch2/ch2-06.html">
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<b>2.6.</b>
包和文件
</a>
</li>
<li class="chapter " data-level="2.7" data-path="ch2/ch2-07.html">
<a href="../ch2/ch2-07.html">
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<b>2.7.</b>
作用域
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="3" data-path="ch3/ch3.html">
<a href="../ch3/ch3.html">
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<b>3.</b>
基礎數據類型
</a>
<ul class="articles">
<li class="chapter " data-level="3.1" data-path="ch3/ch3-01.html">
<a href="../ch3/ch3-01.html">
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<b>3.1.</b>
整型
</a>
</li>
<li class="chapter " data-level="3.2" data-path="ch3/ch3-02.html">
<a href="../ch3/ch3-02.html">
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<b>3.2.</b>
浮點數
</a>
</li>
<li class="chapter " data-level="3.3" data-path="ch3/ch3-03.html">
<a href="../ch3/ch3-03.html">
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<b>3.3.</b>
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複數
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</a>
</li>
<li class="chapter " data-level="3.4" data-path="ch3/ch3-04.html">
<a href="../ch3/ch3-04.html">
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<b>3.4.</b>
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布爾型
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</a>
</li>
<li class="chapter " data-level="3.5" data-path="ch3/ch3-05.html">
<a href="../ch3/ch3-05.html">
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<b>3.5.</b>
字符串
</a>
</li>
<li class="chapter " data-level="3.6" data-path="ch3/ch3-06.html">
<a href="../ch3/ch3-06.html">
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<b>3.6.</b>
常量
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="4" data-path="ch4/ch4.html">
<a href="../ch4/ch4.html">
<i class="fa fa-check"></i>
<b>4.</b>
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複合數據類型
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</a>
<ul class="articles">
<li class="chapter " data-level="4.1" data-path="ch4/ch4-01.html">
<a href="../ch4/ch4-01.html">
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<b>4.1.</b>
數組
</a>
</li>
<li class="chapter " data-level="4.2" data-path="ch4/ch4-02.html">
<a href="../ch4/ch4-02.html">
<i class="fa fa-check"></i>
<b>4.2.</b>
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Slice
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</a>
</li>
<li class="chapter " data-level="4.3" data-path="ch4/ch4-03.html">
<a href="../ch4/ch4-03.html">
<i class="fa fa-check"></i>
<b>4.3.</b>
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Map
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</a>
</li>
<li class="chapter " data-level="4.4" data-path="ch4/ch4-04.html">
<a href="../ch4/ch4-04.html">
<i class="fa fa-check"></i>
<b>4.4.</b>
結構體
</a>
</li>
<li class="chapter " data-level="4.5" data-path="ch4/ch4-05.html">
<a href="../ch4/ch4-05.html">
<i class="fa fa-check"></i>
<b>4.5.</b>
JSON
</a>
</li>
<li class="chapter " data-level="4.6" data-path="ch4/ch4-06.html">
<a href="../ch4/ch4-06.html">
<i class="fa fa-check"></i>
<b>4.6.</b>
文本和HTML模闆
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="5" data-path="ch5/ch5.html">
<a href="../ch5/ch5.html">
<i class="fa fa-check"></i>
<b>5.</b>
函數
</a>
<ul class="articles">
<li class="chapter " data-level="5.1" data-path="ch5/ch5-01.html">
<a href="../ch5/ch5-01.html">
<i class="fa fa-check"></i>
<b>5.1.</b>
函數聲明
</a>
</li>
<li class="chapter " data-level="5.2" data-path="ch5/ch5-02.html">
<a href="../ch5/ch5-02.html">
<i class="fa fa-check"></i>
<b>5.2.</b>
遞歸
</a>
</li>
<li class="chapter " data-level="5.3" data-path="ch5/ch5-03.html">
<a href="../ch5/ch5-03.html">
<i class="fa fa-check"></i>
<b>5.3.</b>
多返迴值
</a>
</li>
<li class="chapter " data-level="5.4" data-path="ch5/ch5-04.html">
<a href="../ch5/ch5-04.html">
<i class="fa fa-check"></i>
<b>5.4.</b>
錯誤
</a>
</li>
<li class="chapter " data-level="5.5" data-path="ch5/ch5-05.html">
<a href="../ch5/ch5-05.html">
<i class="fa fa-check"></i>
<b>5.5.</b>
函數值
</a>
</li>
<li class="chapter " data-level="5.6" data-path="ch5/ch5-06.html">
<a href="../ch5/ch5-06.html">
<i class="fa fa-check"></i>
<b>5.6.</b>
匿名函數
</a>
</li>
<li class="chapter " data-level="5.7" data-path="ch5/ch5-07.html">
<a href="../ch5/ch5-07.html">
<i class="fa fa-check"></i>
<b>5.7.</b>
可變參數
</a>
</li>
<li class="chapter " data-level="5.8" data-path="ch5/ch5-08.html">
<a href="../ch5/ch5-08.html">
<i class="fa fa-check"></i>
<b>5.8.</b>
Deferred函數
</a>
</li>
<li class="chapter " data-level="5.9" data-path="ch5/ch5-09.html">
<a href="../ch5/ch5-09.html">
<i class="fa fa-check"></i>
<b>5.9.</b>
Panic異常
</a>
</li>
<li class="chapter " data-level="5.10" data-path="ch5/ch5-10.html">
<a href="../ch5/ch5-10.html">
<i class="fa fa-check"></i>
<b>5.10.</b>
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Recover捕獲異常
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</a>
</li>
</ul>
</li>
<li class="chapter " data-level="6" data-path="ch6/ch6.html">
<a href="../ch6/ch6.html">
<i class="fa fa-check"></i>
<b>6.</b>
方法
</a>
<ul class="articles">
<li class="chapter " data-level="6.1" data-path="ch6/ch6-01.html">
<a href="../ch6/ch6-01.html">
<i class="fa fa-check"></i>
<b>6.1.</b>
方法聲明
</a>
</li>
<li class="chapter " data-level="6.2" data-path="ch6/ch6-02.html">
<a href="../ch6/ch6-02.html">
<i class="fa fa-check"></i>
<b>6.2.</b>
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基於指針對象的方法
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</a>
</li>
<li class="chapter " data-level="6.3" data-path="ch6/ch6-03.html">
<a href="../ch6/ch6-03.html">
<i class="fa fa-check"></i>
<b>6.3.</b>
通過嵌入結構體來擴展類型
</a>
</li>
<li class="chapter " data-level="6.4" data-path="ch6/ch6-04.html">
<a href="../ch6/ch6-04.html">
<i class="fa fa-check"></i>
<b>6.4.</b>
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方法值和方法表達式
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</a>
</li>
<li class="chapter " data-level="6.5" data-path="ch6/ch6-05.html">
<a href="../ch6/ch6-05.html">
<i class="fa fa-check"></i>
<b>6.5.</b>
示例: Bit數組
</a>
</li>
<li class="chapter " data-level="6.6" data-path="ch6/ch6-06.html">
<a href="../ch6/ch6-06.html">
<i class="fa fa-check"></i>
<b>6.6.</b>
封裝
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="7" data-path="ch7/ch7.html">
<a href="../ch7/ch7.html">
<i class="fa fa-check"></i>
<b>7.</b>
接口
</a>
<ul class="articles">
<li class="chapter " data-level="7.1" data-path="ch7/ch7-01.html">
<a href="../ch7/ch7-01.html">
<i class="fa fa-check"></i>
<b>7.1.</b>
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接口是合約
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</a>
</li>
<li class="chapter " data-level="7.2" data-path="ch7/ch7-02.html">
<a href="../ch7/ch7-02.html">
<i class="fa fa-check"></i>
<b>7.2.</b>
接口類型
</a>
</li>
<li class="chapter " data-level="7.3" data-path="ch7/ch7-03.html">
<a href="../ch7/ch7-03.html">
<i class="fa fa-check"></i>
<b>7.3.</b>
實現接口的條件
</a>
</li>
<li class="chapter " data-level="7.4" data-path="ch7/ch7-04.html">
<a href="../ch7/ch7-04.html">
<i class="fa fa-check"></i>
<b>7.4.</b>
flag.Value接口
</a>
</li>
<li class="chapter " data-level="7.5" data-path="ch7/ch7-05.html">
<a href="../ch7/ch7-05.html">
<i class="fa fa-check"></i>
<b>7.5.</b>
接口值
</a>
</li>
<li class="chapter " data-level="7.6" data-path="ch7/ch7-06.html">
<a href="../ch7/ch7-06.html">
<i class="fa fa-check"></i>
<b>7.6.</b>
sort.Interface接口
</a>
</li>
<li class="chapter " data-level="7.7" data-path="ch7/ch7-07.html">
<a href="../ch7/ch7-07.html">
<i class="fa fa-check"></i>
<b>7.7.</b>
http.Handler接口
</a>
</li>
<li class="chapter " data-level="7.8" data-path="ch7/ch7-08.html">
<a href="../ch7/ch7-08.html">
<i class="fa fa-check"></i>
<b>7.8.</b>
error接口
</a>
</li>
<li class="chapter " data-level="7.9" data-path="ch7/ch7-09.html">
<a href="../ch7/ch7-09.html">
<i class="fa fa-check"></i>
<b>7.9.</b>
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示例: 表達式求值
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</a>
</li>
<li class="chapter " data-level="7.10" data-path="ch7/ch7-10.html">
<a href="../ch7/ch7-10.html">
<i class="fa fa-check"></i>
<b>7.10.</b>
類型斷言
</a>
</li>
<li class="chapter " data-level="7.11" data-path="ch7/ch7-11.html">
<a href="../ch7/ch7-11.html">
<i class="fa fa-check"></i>
<b>7.11.</b>
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基於類型斷言識别錯誤類型
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</a>
</li>
<li class="chapter " data-level="7.12" data-path="ch7/ch7-12.html">
<a href="../ch7/ch7-12.html">
<i class="fa fa-check"></i>
<b>7.12.</b>
通過類型斷言査詢接口
</a>
</li>
<li class="chapter " data-level="7.13" data-path="ch7/ch7-13.html">
<a href="../ch7/ch7-13.html">
<i class="fa fa-check"></i>
<b>7.13.</b>
類型分支
</a>
</li>
<li class="chapter " data-level="7.14" data-path="ch7/ch7-14.html">
<a href="../ch7/ch7-14.html">
<i class="fa fa-check"></i>
<b>7.14.</b>
示例: 基於標記的XML解碼
</a>
</li>
<li class="chapter " data-level="7.15" data-path="ch7/ch7-15.html">
<a href="../ch7/ch7-15.html">
<i class="fa fa-check"></i>
<b>7.15.</b>
補充幾點
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="8" data-path="ch8/ch8.html">
<a href="../ch8/ch8.html">
<i class="fa fa-check"></i>
<b>8.</b>
Goroutines和Channels
</a>
<ul class="articles">
<li class="chapter " data-level="8.1" data-path="ch8/ch8-01.html">
<a href="../ch8/ch8-01.html">
<i class="fa fa-check"></i>
<b>8.1.</b>
Goroutines
</a>
</li>
<li class="chapter " data-level="8.2" data-path="ch8/ch8-02.html">
<a href="../ch8/ch8-02.html">
<i class="fa fa-check"></i>
<b>8.2.</b>
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示例: 併發的Clock服務
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</a>
</li>
<li class="chapter " data-level="8.3" data-path="ch8/ch8-03.html">
<a href="../ch8/ch8-03.html">
<i class="fa fa-check"></i>
<b>8.3.</b>
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示例: 併發的Echo服務
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</a>
</li>
<li class="chapter " data-level="8.4" data-path="ch8/ch8-04.html">
<a href="../ch8/ch8-04.html">
<i class="fa fa-check"></i>
<b>8.4.</b>
Channels
</a>
</li>
<li class="chapter " data-level="8.5" data-path="ch8/ch8-05.html">
<a href="../ch8/ch8-05.html">
<i class="fa fa-check"></i>
<b>8.5.</b>
併行的循環
</a>
</li>
<li class="chapter " data-level="8.6" data-path="ch8/ch8-06.html">
<a href="../ch8/ch8-06.html">
<i class="fa fa-check"></i>
<b>8.6.</b>
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示例: 併發的Web爬蟲
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</a>
</li>
<li class="chapter " data-level="8.7" data-path="ch8/ch8-07.html">
<a href="../ch8/ch8-07.html">
<i class="fa fa-check"></i>
<b>8.7.</b>
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基於select的多路複用
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</a>
</li>
<li class="chapter " data-level="8.8" data-path="ch8/ch8-08.html">
<a href="../ch8/ch8-08.html">
<i class="fa fa-check"></i>
<b>8.8.</b>
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示例: 併發的字典遍歷
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</a>
</li>
<li class="chapter " data-level="8.9" data-path="ch8/ch8-09.html">
<a href="../ch8/ch8-09.html">
<i class="fa fa-check"></i>
<b>8.9.</b>
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併發的退出
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</a>
</li>
<li class="chapter " data-level="8.10" data-path="ch8/ch8-10.html">
<a href="../ch8/ch8-10.html">
<i class="fa fa-check"></i>
<b>8.10.</b>
示例: 聊天服務
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="9" data-path="ch9/ch9.html">
<a href="../ch9/ch9.html">
<i class="fa fa-check"></i>
<b>9.</b>
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基於共享變量的併發
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</a>
<ul class="articles">
<li class="chapter " data-level="9.1" data-path="ch9/ch9-01.html">
<a href="../ch9/ch9-01.html">
<i class="fa fa-check"></i>
<b>9.1.</b>
競爭條件
</a>
</li>
<li class="chapter " data-level="9.2" data-path="ch9/ch9-02.html">
<a href="../ch9/ch9-02.html">
<i class="fa fa-check"></i>
<b>9.2.</b>
sync.Mutex互斥鎖
</a>
</li>
<li class="chapter " data-level="9.3" data-path="ch9/ch9-03.html">
<a href="../ch9/ch9-03.html">
<i class="fa fa-check"></i>
<b>9.3.</b>
sync.RWMutex讀寫鎖
</a>
</li>
<li class="chapter " data-level="9.4" data-path="ch9/ch9-04.html">
<a href="../ch9/ch9-04.html">
<i class="fa fa-check"></i>
<b>9.4.</b>
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內存同步
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</a>
</li>
<li class="chapter " data-level="9.5" data-path="ch9/ch9-05.html">
<a href="../ch9/ch9-05.html">
<i class="fa fa-check"></i>
<b>9.5.</b>
sync.Once初始化
</a>
</li>
<li class="chapter " data-level="9.6" data-path="ch9/ch9-06.html">
<a href="../ch9/ch9-06.html">
<i class="fa fa-check"></i>
<b>9.6.</b>
競爭條件檢測
</a>
</li>
<li class="chapter " data-level="9.7" data-path="ch9/ch9-07.html">
<a href="../ch9/ch9-07.html">
<i class="fa fa-check"></i>
<b>9.7.</b>
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示例: 併發的非阻塞緩存
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</a>
</li>
<li class="chapter " data-level="9.8" data-path="ch9/ch9-08.html">
<a href="../ch9/ch9-08.html">
<i class="fa fa-check"></i>
<b>9.8.</b>
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Goroutines和線程
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</a>
</li>
</ul>
</li>
<li class="chapter " data-level="10" data-path="ch10/ch10.html">
<a href="../ch10/ch10.html">
<i class="fa fa-check"></i>
<b>10.</b>
包和工具
</a>
<ul class="articles">
<li class="chapter " data-level="10.1" data-path="ch10/ch10-01.html">
<a href="../ch10/ch10-01.html">
<i class="fa fa-check"></i>
<b>10.1.</b>
簡介
</a>
</li>
<li class="chapter " data-level="10.2" data-path="ch10/ch10-02.html">
<a href="../ch10/ch10-02.html">
<i class="fa fa-check"></i>
<b>10.2.</b>
導入路徑
</a>
</li>
<li class="chapter " data-level="10.3" data-path="ch10/ch10-03.html">
<a href="../ch10/ch10-03.html">
<i class="fa fa-check"></i>
<b>10.3.</b>
包聲明
</a>
</li>
<li class="chapter " data-level="10.4" data-path="ch10/ch10-04.html">
<a href="../ch10/ch10-04.html">
<i class="fa fa-check"></i>
<b>10.4.</b>
導入聲明
</a>
</li>
<li class="chapter " data-level="10.5" data-path="ch10/ch10-05.html">
<a href="../ch10/ch10-05.html">
<i class="fa fa-check"></i>
<b>10.5.</b>
匿名導入
</a>
</li>
<li class="chapter " data-level="10.6" data-path="ch10/ch10-06.html">
<a href="../ch10/ch10-06.html">
<i class="fa fa-check"></i>
<b>10.6.</b>
包和命名
</a>
</li>
<li class="chapter " data-level="10.7" data-path="ch10/ch10-07.html">
<a href="../ch10/ch10-07.html">
<i class="fa fa-check"></i>
<b>10.7.</b>
工具
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="11" data-path="ch11/ch11.html">
<a href="../ch11/ch11.html">
<i class="fa fa-check"></i>
<b>11.</b>
測試
</a>
<ul class="articles">
<li class="chapter " data-level="11.1" data-path="ch11/ch11-01.html">
<a href="../ch11/ch11-01.html">
<i class="fa fa-check"></i>
<b>11.1.</b>
go test
</a>
</li>
<li class="chapter " data-level="11.2" data-path="ch11/ch11-02.html">
<a href="../ch11/ch11-02.html">
<i class="fa fa-check"></i>
<b>11.2.</b>
測試函數
</a>
</li>
<li class="chapter " data-level="11.3" data-path="ch11/ch11-03.html">
<a href="../ch11/ch11-03.html">
<i class="fa fa-check"></i>
<b>11.3.</b>
測試覆蓋率
</a>
</li>
<li class="chapter " data-level="11.4" data-path="ch11/ch11-04.html">
<a href="../ch11/ch11-04.html">
<i class="fa fa-check"></i>
<b>11.4.</b>
基準測試
</a>
</li>
<li class="chapter " data-level="11.5" data-path="ch11/ch11-05.html">
<a href="../ch11/ch11-05.html">
<i class="fa fa-check"></i>
<b>11.5.</b>
剖析
</a>
</li>
<li class="chapter " data-level="11.6" data-path="ch11/ch11-06.html">
<a href="../ch11/ch11-06.html">
<i class="fa fa-check"></i>
<b>11.6.</b>
示例函數
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="12" data-path="ch12/ch12.html">
<a href="../ch12/ch12.html">
<i class="fa fa-check"></i>
<b>12.</b>
反射
</a>
<ul class="articles">
<li class="chapter " data-level="12.1" data-path="ch12/ch12-01.html">
<a href="../ch12/ch12-01.html">
<i class="fa fa-check"></i>
<b>12.1.</b>
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爲何需要反射?
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</a>
</li>
<li class="chapter " data-level="12.2" data-path="ch12/ch12-02.html">
<a href="../ch12/ch12-02.html">
<i class="fa fa-check"></i>
<b>12.2.</b>
reflect.Type和reflect.Value
</a>
</li>
<li class="chapter " data-level="12.3" data-path="ch12/ch12-03.html">
<a href="../ch12/ch12-03.html">
<i class="fa fa-check"></i>
<b>12.3.</b>
Display遞歸打印
</a>
</li>
<li class="chapter " data-level="12.4" data-path="ch12/ch12-04.html">
<a href="../ch12/ch12-04.html">
<i class="fa fa-check"></i>
<b>12.4.</b>
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示例: 編碼S表達式
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</a>
</li>
<li class="chapter " data-level="12.5" data-path="ch12/ch12-05.html">
<a href="../ch12/ch12-05.html">
<i class="fa fa-check"></i>
<b>12.5.</b>
通過reflect.Value脩改值
</a>
</li>
<li class="chapter " data-level="12.6" data-path="ch12/ch12-06.html">
<a href="../ch12/ch12-06.html">
<i class="fa fa-check"></i>
<b>12.6.</b>
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示例: 解碼S表達式
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</a>
</li>
<li class="chapter " data-level="12.7" data-path="ch12/ch12-07.html">
<a href="../ch12/ch12-07.html">
<i class="fa fa-check"></i>
<b>12.7.</b>
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獲取結構體字段標識
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</a>
</li>
<li class="chapter " data-level="12.8" data-path="ch12/ch12-08.html">
<a href="../ch12/ch12-08.html">
<i class="fa fa-check"></i>
<b>12.8.</b>
顯示一個類型的方法集
</a>
</li>
<li class="chapter " data-level="12.9" data-path="ch12/ch12-09.html">
<a href="../ch12/ch12-09.html">
<i class="fa fa-check"></i>
<b>12.9.</b>
幾點忠告
</a>
</li>
</ul>
</li>
<li class="chapter " data-level="13" data-path="ch13/ch13.html">
<a href="../ch13/ch13.html">
<i class="fa fa-check"></i>
<b>13.</b>
底層編程
</a>
<ul class="articles">
<li class="chapter " data-level="13.1" data-path="ch13/ch13-01.html">
<a href="../ch13/ch13-01.html">
<i class="fa fa-check"></i>
<b>13.1.</b>
unsafe.Sizeof, Alignof 和 Offsetof
</a>
</li>
<li class="chapter " data-level="13.2" data-path="ch13/ch13-02.html">
<a href="../ch13/ch13-02.html">
<i class="fa fa-check"></i>
<b>13.2.</b>
unsafe.Pointer
</a>
</li>
<li class="chapter " data-level="13.3" data-path="ch13/ch13-03.html">
<a href="../ch13/ch13-03.html">
<i class="fa fa-check"></i>
<b>13.3.</b>
示例: 深度相等判斷
</a>
</li>
<li class="chapter " data-level="13.4" data-path="ch13/ch13-04.html">
<a href="../ch13/ch13-04.html">
<i class="fa fa-check"></i>
<b>13.4.</b>
通過cgo調用C代碼
</a>
</li>
<li class="chapter " data-level="13.5" data-path="ch13/ch13-05.html">
<a href="../ch13/ch13-05.html">
<i class="fa fa-check"></i>
<b>13.5.</b>
幾點忠告
</a>
</li>
</ul>
</li>
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<li class="chapter " data-level="14" data-path="CONTRIBUTORS.html">
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2015-12-24 06:47:06 +00:00
<a href="../CONTRIBUTORS.html">
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<i class="fa fa-check"></i>
2015-12-21 04:55:18 +00:00
<b>14.</b>
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2015-12-24 06:47:06 +00:00
附録
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</a>
</li>
<li class="divider"></li>
<li>
<a href="https://www.gitbook.com" target="blank" class="gitbook-link">
本書使用 GitBook 釋出
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<!-- Actions Left -->
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<h1>
<i class="fa fa-circle-o-notch fa-spin"></i>
2015-12-31 08:20:27 +00:00
<a href="../" >Go语言圣经</a>
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</h1>
</div>
<div class="page-wrapper" tabindex="-1" role="main">
<div class="page-inner">
<section class="normal" id="section-">
<h2 id="17-web&#x670D;&#x52D9;">1.7. Web&#x670D;&#x52D9;</h2>
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<p>Go&#x8A9E;&#x8A00;&#x7684;&#x5167;&#x7F6E;&#x5EAB;&#x8B93;&#x6211;&#x5011;&#x5BEB;&#x4E00;&#x500B;&#x50CF;fetch&#x9019;&#x6A23;&#x4F8B;&#x5B50;&#x7684;web&#x670D;&#x52D9;&#x5668;&#x8B8A;&#x5F97;&#x7570;&#x5E38;&#x5730;&#x7C21;&#x55AE;&#x3002;&#x5728;&#x672C;&#x7BC0;&#x4E2D;&#xFF0C;&#x6211;&#x5011;&#x6703;&#x5C55;&#x793A;&#x4E00;&#x500B;&#x5FAE;&#x578B;&#x670D;&#x52D9;&#x5668;&#xFF0C;&#x9019;&#x500B;&#x670D;&#x52D9;&#x7684;&#x529F;&#x80FD;&#x662F;&#x8FD4;&#x8FF4;&#x7576;&#x524D;&#x7528;&#x6236;&#x6B63;&#x5728;&#x8A2A;&#x554F;&#x7684;URL&#x3002;&#x4E5F;&#x5C31;&#x662F;&#x8AAC;&#x6BD4;&#x5982;&#x7528;&#x6236;&#x8A2A;&#x554F;&#x7684;&#x662F; <a href="http://localhost:8000/hello" target="_blank">http://localhost:8000/hello</a> &#xFF0C;&#x90A3;&#x9EBD;&#x97FF;&#x61C9;&#x662F;URL.Path = &quot;hello&quot;&#x3002;</p>
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<pre><code class="lang-go">gopl.io/ch1/server1
<span class="hljs-comment">// Server1 is a minimal &quot;echo&quot; server.</span>
<span class="hljs-keyword">package</span> main
<span class="hljs-keyword">import</span> (
<span class="hljs-string">&quot;fmt&quot;</span>
<span class="hljs-string">&quot;log&quot;</span>
<span class="hljs-string">&quot;net/http&quot;</span>
)
<span class="hljs-keyword">func</span> main() {
http.HandleFunc(<span class="hljs-string">&quot;/&quot;</span>, handler) <span class="hljs-comment">// each request calls handler</span>
log.Fatal(http.ListenAndServe(<span class="hljs-string">&quot;localhost:8000&quot;</span>, <span class="hljs-constant">nil</span>))
}
<span class="hljs-comment">// handler echoes the Path component of the request URL r.</span>
<span class="hljs-keyword">func</span> handler(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintf(w, <span class="hljs-string">&quot;URL.Path = %q\n&quot;</span>, r.URL.Path)
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}
</code></pre>
2015-12-28 08:08:26 +00:00
<p>&#x6211;&#x5011;&#x96BB;&#x7528;&#x4E86;&#x516B;&#x4E5D;&#x884C;&#x4EE3;&#x78BC;&#x5C31;&#x5BE6;&#x73FE;&#x4E86;&#x4E00;&#x500B;&#x500B;Web&#x670D;&#x52D9;&#x7A0B;&#x5E8F;&#xFF0C;&#x9019;&#x90FD;&#x662F;&#x591A;&#x8667;&#x4E86;&#x6A19;&#x6E96;&#x5EAB;&#x91CC;&#x7684;&#x65B9;&#x6CD5;&#x5DF2;&#x7D93;&#x5E6B;&#x6211;&#x5011;&#x8655;&#x7406;&#x4E86;&#x5927;&#x91CF;&#x7684;&#x5DE5;&#x4F5C;&#x3002;main&#x51FD;&#x6578;&#x6703;&#x5C07;&#x6240;&#x6709;&#x767C;&#x9001;&#x5230;/&#x8DEF;&#x5F91;&#x4E0B;&#x7684;&#x8ACB;&#x6C42;&#x548C;handler&#x51FD;&#x6578;&#x95DC;&#x806F;&#x8D77;&#x4F86;&#xFF0C;/&#x958B;&#x982D;&#x7684;&#x8ACB;&#x6C42;&#x5176;&#x5BE6;&#x5C31;&#x662F;&#x6240;&#x6709;&#x767C;&#x9001;&#x5230;&#x7576;&#x524D;&#x7AD9;&#x9EDE;&#x4E0A;&#x7684;&#x8ACB;&#x6C42;&#xFF0C;&#x6211;&#x5011;&#x7684;&#x670D;&#x52D9;&#x8DD1;&#x5728;&#x4E86;8000&#x7AEF;&#x53E3;&#x4E0A;&#x3002;&#x767C;&#x9001;&#x5230;&#x9019;&#x500B;&#x670D;&#x52D9;&#x7684;&#x201C;&#x8ACB;&#x6C42;&#x201D;&#x662F;&#x4E00;&#x500B;http.Request&#x985E;&#x578B;&#x7684;&#x5C0D;&#x8C61;&#xFF0C;&#x9019;&#x500B;&#x5C0D;&#x8C61;&#x4E2D;&#x5305;&#x542B;&#x4E86;&#x8ACB;&#x6C42;&#x4E2D;&#x7684;&#x4E00;&#x7E6B;&#x5217;&#x76F8;&#x95DC;&#x5B57;&#x6BB5;&#xFF0C;&#x5176;&#x4E2D;&#x5C31;&#x5305;&#x62EC;&#x6211;&#x5011;&#x9700;&#x8981;&#x7684;URL&#x3002;&#x7576;&#x8ACB;&#x6C42;&#x5230;&#x9054;&#x670D;&#x52D9;&#x5668;&#x6642;&#xFF0C;&#x9019;&#x500B;&#x8ACB;&#x6C42;&#x6703;&#x88AB;&#x50B3;&#x7D66;handler&#x51FD;&#x6578;&#x4F86;&#x8655;&#x7406;&#xFF0C;&#x9019;&#x500B;&#x51FD;&#x6578;&#x6703;&#x5C07;/hello&#x9019;&#x500B;&#x8DEF;&#x5F91;&#x5F9E;&#x8ACB;&#x6C42;&#x7684;URL&#x4E2D;&#x89E3;&#x6790;&#x51FA;&#x4F86;&#xFF0C;&#x7136;&#x5F8C;&#x628A;&#x5176;&#x767C;&#x9001;&#x5230;&#x97FF;&#x61C9;&#x4E2D;&#xFF0C;&#x9019;&#x91CC;&#x6211;&#x5011;&#x7528;&#x7684;&#x662F;&#x6A19;&#x6E96;&#x8F38;&#x51FA;&#x6D41;&#x7684;fmt.Fprintf&#x3002;Web&#x670D;&#x52D9;&#x6703;&#x5728;&#x7B2C;7.7&#x7BC0;&#x4E2D;&#x8A73;&#x7D30;&#x95E1;&#x8FF0;&#x3002;</p>
<p>&#x8B93;&#x6211;&#x5011;&#x5728;&#x5F8C;&#x53F0;&#x904B;&#x884C;&#x9019;&#x500B;&#x670D;&#x52D9;&#x7A0B;&#x5E8F;&#x3002;&#x5982;&#x679C;&#x4F60;&#x7684;&#x64CD;&#x4F5C;&#x7E6B;&#x7D71;&#x662F;Mac OS X&#x6216;&#x8005;Linux&#xFF0C;&#x90A3;&#x9EBD;&#x5728;&#x904B;&#x884C;&#x547D;&#x4EE4;&#x7684;&#x672B;&#x5C3E;&#x52A0;&#x4E0A;&#x4E00;&#x500B;&amp;&#x7B26;&#x865F;&#xFF0C;&#x537D;&#x53EF;&#x8B93;&#x7A0B;&#x5E8F;&#x7C21;&#x55AE;&#x5730;&#x8DD1;&#x5728;&#x5F8C;&#x53F0;&#xFF0C;&#x800C;&#x5728;windows&#x4E0B;&#xFF0C;&#x4F60;&#x9700;&#x8981;&#x5728;&#x53E6;&#x5916;&#x4E00;&#x500B;&#x547D;&#x4EE4;&#x884C;&#x7A97;&#x53E3;&#x53BB;&#x904B;&#x884C;&#x9019;&#x500B;&#x7A0B;&#x5E8F;&#x4E86;&#x3002;</p>
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<pre><code>$ go run src/gopl.io/ch1/server1/main.go &amp;
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</code></pre><p>&#x73FE;&#x5728;&#x6211;&#x5011;&#x53EF;&#x4EE5;&#x901A;&#x904E;&#x547D;&#x4EE4;&#x884C;&#x4F86;&#x767C;&#x9001;&#x5BA2;&#x6236;&#x7AEF;&#x8ACB;&#x6C42;&#x4E86;&#xFF1A;</p>
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<pre><code>$ go build gopl.io/ch1/fetch
$ ./fetch http://localhost:8000
URL.Path = &quot;/&quot;
$ ./fetch http://localhost:8000/help
URL.Path = &quot;/help&quot;
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</code></pre><p>&#x53E6;&#x5916;&#x6211;&#x5011;&#x9084;&#x53EF;&#x4EE5;&#x76F4;&#x63A5;&#x5728;&#x700F;&#x89BD;&#x5668;&#x91CC;&#x8A2A;&#x554F;&#x9019;&#x500B;URL&#xFF0C;&#x7136;&#x5F8C;&#x5F97;&#x5230;&#x8FD4;&#x8FF4;&#x7D50;&#x679C;&#xFF0C;&#x5982;&#x5716;1.2&#xFF1A;</p>
<p><img src="../images/ch1-02.png" alt=""></p>
2015-12-28 08:08:26 +00:00
<p>&#x5728;&#x9019;&#x500B;&#x670D;&#x52D9;&#x7684;&#x57FA;&#x790E;&#x4E0A;&#x758A;&#x52A0;&#x7279;&#x6027;&#x662F;&#x5F88;&#x5BB9;&#x6613;&#x7684;&#x3002;&#x4E00;&#x7A2E;&#x6BD4;&#x8F03;&#x5BE6;&#x7528;&#x7684;&#x8129;&#x6539;&#x662F;&#x7232;&#x8A2A;&#x554F;&#x7684;url&#x6DFB;&#x52A0;&#x67D0;&#x7A2E;&#x72C0;&#x614B;&#x3002;&#x6BD4;&#x5982;&#xFF0C;&#x4E0B;&#x9762;&#x9019;&#x500B;&#x7248;&#x672C;&#x8F38;&#x51FA;&#x4E86;&#x540C;&#x6A23;&#x7684;&#x5167;&#x5BB9;&#xFF0C;&#x4F46;&#x662F;&#x6703;&#x5C0D;&#x8ACB;&#x6C42;&#x7684;&#x6B21;&#x6578;&#x9032;&#x884C;&#x8A08;&#x7B97;&#xFF1B;&#x5C0D;URL&#x7684;&#x8ACB;&#x6C42;&#x7D50;&#x679C;&#x6703;&#x5305;&#x542B;&#x5404;&#x7A2E;URL&#x88AB;&#x8A2A;&#x554F;&#x7684;&#x7E3D;&#x6B21;&#x6578;&#xFF0C;&#x76F4;&#x63A5;&#x5C0D;/count&#x9019;&#x500B;URL&#x7684;&#x8A2A;&#x554F;&#x8981;&#x9664;&#x5916;&#x3002;</p>
2015-12-09 07:57:17 +00:00
<pre><code class="lang-go">gopl.io/ch1/server2
<span class="hljs-comment">// Server2 is a minimal &quot;echo&quot; and counter server.</span>
<span class="hljs-keyword">package</span> main
<span class="hljs-keyword">import</span> (
<span class="hljs-string">&quot;fmt&quot;</span>
<span class="hljs-string">&quot;log&quot;</span>
<span class="hljs-string">&quot;net/http&quot;</span>
<span class="hljs-string">&quot;sync&quot;</span>
)
<span class="hljs-keyword">var</span> mu sync.Mutex
<span class="hljs-keyword">var</span> count <span class="hljs-typename">int</span>
<span class="hljs-keyword">func</span> main() {
http.HandleFunc(<span class="hljs-string">&quot;/&quot;</span>, handler)
http.HandleFunc(<span class="hljs-string">&quot;/count&quot;</span>, counter)
log.Fatal(http.ListenAndServe(<span class="hljs-string">&quot;localhost:8000&quot;</span>, <span class="hljs-constant">nil</span>))
}
<span class="hljs-comment">// handler echoes the Path component of the requested URL.</span>
<span class="hljs-keyword">func</span> handler(w http.ResponseWriter, r *http.Request) {
mu.Lock()
count++
mu.Unlock()
fmt.Fprintf(w, <span class="hljs-string">&quot;URL.Path = %q\n&quot;</span>, r.URL.Path)
}
<span class="hljs-comment">// counter echoes the number of calls so far.</span>
<span class="hljs-keyword">func</span> counter(w http.ResponseWriter, r *http.Request) {
mu.Lock()
fmt.Fprintf(w, <span class="hljs-string">&quot;Count %d\n&quot;</span>, count)
mu.Unlock()
}
</code></pre>
2015-12-24 06:47:06 +00:00
<p>&#x9019;&#x500B;&#x670D;&#x52D9;&#x5668;&#x6709;&#x5169;&#x500B;&#x8ACB;&#x6C42;&#x8655;&#x7406;&#x51FD;&#x6578;&#xFF0C;&#x8ACB;&#x6C42;&#x7684;url&#x6703;&#x6C7A;&#x5B9A;&#x5177;&#x9AD4;&#x8ABF;&#x7528;&#x54EA;&#x4E00;&#x500B;&#xFF1A;&#x5C0D;/count&#x9019;&#x500B;url&#x7684;&#x8ACB;&#x6C42;&#x6703;&#x8ABF;&#x7528;&#x5230;count&#x9019;&#x500B;&#x51FD;&#x6578;&#xFF0C;&#x5176;&#x5B83;&#x6240;&#x6709;&#x7684;url&#x90FD;&#x6703;&#x8ABF;&#x7528;&#x9ED8;&#x8A8D;&#x7684;&#x8655;&#x7406;&#x51FD;&#x6578;&#x3002;&#x5982;&#x679C;&#x4F60;&#x7684;&#x8ACB;&#x6C42;pattern&#x662F;&#x4EE5;/&#x7D50;&#x5C3E;&#xFF0C;&#x90A3;&#x9EBD;&#x6240;&#x6709;&#x4EE5;&#x8A72;url&#x7232;&#x524D;&#x7DB4;&#x7684;url&#x90FD;&#x6703;&#x88AB;&#x9019;&#x689D;&#x898F;&#x5247;&#x5339;&#x914D;&#x3002;&#x5728;&#x9019;&#x4E9B;&#x4EE3;&#x78BC;&#x7684;&#x80CC;&#x5F8C;&#xFF0C;&#x670D;&#x52D9;&#x5668;&#x6BCF;&#x4E00;&#x6B21;&#x63A5;&#x6536;&#x8ACB;&#x6C42;&#x8655;&#x7406;&#x6642;&#x90FD;&#x6703;&#x53E6;&#x8D77;&#x4E00;&#x500B;goroutine&#xFF0C;&#x9019;&#x6A23;&#x670D;&#x52D9;&#x5668;&#x5C31;&#x53EF;&#x4EE5;&#x540C;&#x4E00;&#x6642;&#x9593;&#x8655;&#x7406;&#x591A;&#x6578;&#x8ACB;&#x6C42;&#x3002;&#x7136;&#x800C;&#x5728;&#x4F75;&#x767C;&#x60C5;&#x6CC1;&#x4E0B;&#xFF0C;&#x5047;&#x5982;&#x771E;&#x7684;&#x6709;&#x5169;&#x500B;&#x8ACB;&#x6C42;&#x540C;&#x4E00;&#x6642;&#x523B;&#x53BB;&#x66F4;&#x65B0;count&#xFF0C;&#x90A3;&#x9EBD;&#x9019;&#x500B;&#x503C;&#x53EF;&#x80FD;&#x4F75;&#x4E0D;&#x6703;&#x88AB;&#x6B63;&#x78BA;&#x5730;&#x589E;&#x52A0;&#xFF1B;&#x9019;&#x500B;&#x7A0B;&#x5E8F;&#x53EF;&#x80FD;&#x6703;&#x88AB;&#x5F15;&#x767C;&#x4E00;&#x500B;&#x56B4;&#x91CD;&#x7684;bug&#xFF1A;&#x7AF6;&#x614B;&#x689D;&#x4EF6;&#xFF08;&#x53C3;&#x898B;9.1&#xFF09;&#x3002;&#x7232;&#x4E86;&#x907F;&#x514D;&#x9019;&#x500B;&#x554F;&#x984C;&#xFF0C;&#x6211;&#x5011;&#x5FC5;&#x9B1A;&#x4FDD;&#x8B49;&#x6BCF;&#x6B21;&#x8129;&#x6539;&#x8B8A;&#x91CF;&#x7684;&#x6700;&#x591A;&#x96BB;&#x80FD;&#x6709;&#x4E00;&#x500B;goroutine&#xFF0C;&#x9019;&#x4E5F;&#x5C31;&#x662F;&#x4EE3;&#x78BC;&#x91CC;&#x7684;mu.Lock()&#x548C;mu.Unlock()&#x8ABF;&#x7528;&#x5C07;&#x8129;&#x6539;count&#x7684;&#x6240;&#x6709;&#x884C;&#x7232;&#x5305;&#x5728;&#x4E2D;&#x9593;&#x7684;&#x76EE;&#x7684;&#x3002;&#x7B2C;&#x4E5D;&#x7AE0;&#x4E2D;&#x6211;&#x5011;&#x6703;&#x9032;&#x4E00;&#x6B65;&#x8B1B;&#x89E3;&#x5171;&#x4EAB;&#x8B8A;&#x91CF;&#x3002;</p>
2015-12-28 08:08:26 +00:00
<p>&#x4E0B;&#x9762;&#x662F;&#x4E00;&#x500B;&#x66F4;&#x7232;&#x8C50;&#x5BCC;&#x7684;&#x4F8B;&#x5B50;&#xFF0C;handler&#x51FD;&#x6578;&#x6703;&#x628A;&#x8ACB;&#x6C42;&#x7684;http&#x982D;&#x548C;&#x8ACB;&#x6C42;&#x7684;form&#x6578;&#x64DA;&#x90FD;&#x6253;&#x5370;&#x51FA;&#x4F86;&#xFF0C;&#x9019;&#x6A23;&#x53EF;&#x4EE5;&#x8B93;&#x6AA2;&#x67FB;&#x548C;&#x8ABF;&#x8A66;&#x9019;&#x500B;&#x670D;&#x52D9;&#x66F4;&#x7232;&#x65B9;&#x4FBF;&#xFF1A;</p>
2015-12-09 07:57:17 +00:00
<pre><code class="lang-go">gopl.io/ch1/server3
<span class="hljs-comment">// handler echoes the HTTP request.</span>
<span class="hljs-keyword">func</span> handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, <span class="hljs-string">&quot;%s %s %s\n&quot;</span>, r.Method, r.URL, r.Proto)
<span class="hljs-keyword">for</span> k, v := <span class="hljs-keyword">range</span> r.Header {
fmt.Fprintf(w, <span class="hljs-string">&quot;Header[%q] = %q\n&quot;</span>, k, v)
}
fmt.Fprintf(w, <span class="hljs-string">&quot;Host = %q\n&quot;</span>, r.Host)
fmt.Fprintf(w, <span class="hljs-string">&quot;RemoteAddr = %q\n&quot;</span>, r.RemoteAddr)
<span class="hljs-keyword">if</span> err := r.ParseForm(); err != <span class="hljs-constant">nil</span> {
log.Print(err)
}
<span class="hljs-keyword">for</span> k, v := <span class="hljs-keyword">range</span> r.Form {
2015-12-24 06:47:06 +00:00
fmt.Fprintf(w, <span class="hljs-string">&quot;Form[%q] = %q\n&quot;</span>, k, v)
2015-12-09 07:57:17 +00:00
}
}
</code></pre>
2015-12-28 08:08:26 +00:00
<p>&#x6211;&#x5011;&#x7528;http.Request&#x9019;&#x500B;struct&#x91CC;&#x7684;&#x5B57;&#x6BB5;&#x4F86;&#x8F38;&#x51FA;&#x4E0B;&#x9762;&#x9019;&#x6A23;&#x7684;&#x5167;&#x5BB9;&#xFF1A;</p>
2015-12-09 07:57:17 +00:00
<pre><code>GET /?q=query HTTP/1.1
Header[&quot;Accept-Encoding&quot;] = [&quot;gzip, deflate, sdch&quot;] Header[&quot;Accept-Language&quot;] = [&quot;en-US,en;q=0.8&quot;]
Header[&quot;Connection&quot;] = [&quot;keep-alive&quot;]
Header[&quot;Accept&quot;] = [&quot;text/html,application/xhtml+xml,application/xml;...&quot;] Header[&quot;User-Agent&quot;] = [&quot;Mozilla/5.0 (Macintosh; Intel Mac OS X 10_7_5)...&quot;] Host = &quot;localhost:8000&quot;
RemoteAddr = &quot;127.0.0.1:59911&quot;
Form[&quot;q&quot;] = [&quot;query&quot;]
2015-12-28 08:08:26 +00:00
</code></pre><p>&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x9019;&#x91CC;&#x7684;ParseForm&#x88AB;&#x5D4C;&#x5957;&#x5728;&#x4E86;if&#x8A9E;&#x53E5;&#x4E2D;&#x3002;Go&#x8A9E;&#x8A00;&#x5141;&#x8A31;&#x9019;&#x6A23;&#x7684;&#x4E00;&#x500B;&#x7C21;&#x55AE;&#x7684;&#x8A9E;&#x53E5;&#x7D50;&#x679C;&#x4F5C;&#x7232;&#x5FAA;&#x74B0;&#x7684;&#x8B8A;&#x91CF;&#x8072;&#x660E;&#x51FA;&#x73FE;&#x5728;if&#x8A9E;&#x53E5;&#x7684;&#x6700;&#x524D;&#x9762;&#xFF0C;&#x9019;&#x4E00;&#x9EDE;&#x5C0D;&#x932F;&#x8AA4;&#x8655;&#x7406;&#x5F88;&#x6709;&#x7528;&#x8655;&#x3002;&#x6211;&#x5011;&#x9084;&#x53EF;&#x4EE5;&#x50CF;&#x4E0B;&#x9762;&#x9019;&#x6A23;&#x5BEB;&#xFF08;&#x7576;&#x7136;&#x770B;&#x8D77;&#x4F86;&#x5C31;&#x9577;&#x4E86;&#x4E00;&#x4E9B;&#xFF09;&#xFF1A;</p>
2015-12-09 07:57:17 +00:00
<pre><code class="lang-go">err := r.ParseForm()
<span class="hljs-keyword">if</span> err != <span class="hljs-constant">nil</span> {
log.Print(err)
}
</code></pre>
2015-12-21 04:55:18 +00:00
<p>&#x7528;if&#x548C;ParseForm&#x7D50;&#x5408;&#x53EF;&#x4EE5;&#x8B93;&#x4EE3;&#x78BC;&#x66F4;&#x52A0;&#x7C21;&#x55AE;&#xFF0C;&#x4F75;&#x4E14;&#x53EF;&#x4EE5;&#x9650;&#x88FD;err&#x9019;&#x500B;&#x8B8A;&#x91CF;&#x7684;&#x4F5C;&#x7528;&#x57DF;&#xFF0C;&#x9019;&#x9EBD;&#x505A;&#x662F;&#x5F88;&#x4E0D;&#x932F;&#x7684;&#x3002;&#x6211;&#x5011;&#x6703;&#x5728;2.7&#x7BC0;&#x4E2D;&#x8B1B;&#x89E3;&#x4F5C;&#x7528;&#x57DF;&#x3002;</p>
2015-12-28 08:08:26 +00:00
<p>&#x5728;&#x9019;&#x4E9B;&#x7A0B;&#x5E8F;&#x4E2D;&#xFF0C;&#x6211;&#x5011;&#x770B;&#x5230;&#x4E86;&#x5F88;&#x591A;&#x4E0D;&#x540C;&#x7684;&#x985E;&#x578B;&#x88AB;&#x8F38;&#x51FA;&#x5230;&#x6A19;&#x6E96;&#x8F38;&#x51FA;&#x6D41;&#x4E2D;&#x3002;&#x6BD4;&#x5982;&#x524D;&#x9762;&#x7684;fetch&#x7A0B;&#x5E8F;&#xFF0C;&#x5C31;&#x628A;HTTP&#x7684;&#x97FF;&#x61C9;&#x6578;&#x64DA;&#x62F7;&#x8C9D;&#x5230;&#x4E86;os.Stdout&#xFF0C;&#x6216;&#x8005;&#x5728;lissajous&#x7A0B;&#x5E8F;&#x91CC;&#x6211;&#x5011;&#x8F38;&#x51FA;&#x7684;&#x662F;&#x4E00;&#x500B;&#x6587;&#x4EF6;&#x3002;fetchall&#x7A0B;&#x5E8F;&#x5247;&#x5B8C;&#x5168;&#x5FFD;&#x7565;&#x5230;&#x4E86;HTTP&#x7684;&#x97FF;&#x61C9;&#x9AD4;&#xFF0C;&#x96BB;&#x662F;&#x8A08;&#x7B97;&#x4E86;&#x4E00;&#x4E0B;&#x97FF;&#x61C9;&#x9AD4;&#x7684;&#x5927;&#x5C0F;&#xFF0C;&#x9019;&#x500B;&#x7A0B;&#x5E8F;&#x4E2D;&#x628A;&#x97FF;&#x61C9;&#x9AD4;&#x62F7;&#x8C9D;&#x5230;&#x4E86;ioutil.Discard&#x3002;&#x5728;&#x672C;&#x7BC0;&#x7684;web&#x670D;&#x52D9;&#x5668;&#x7A0B;&#x5E8F;&#x4E2D;&#x5247;&#x662F;&#x7528;fmt.Fprintf&#x76F4;&#x63A5;&#x5BEB;&#x5230;&#x4E86;http.ResponseWriter&#x4E2D;&#x3002;</p>
<p>&#x76E1;&#x7BA1;&#x9019;&#x4E09;&#x7A2E;&#x5177;&#x9AD4;&#x7684;&#x5BE6;&#x73FE;&#x6D41;&#x7A0B;&#x4F75;&#x4E0D;&#x592A;&#x4E00;&#x6A23;&#xFF0C;&#x4ED6;&#x5011;&#x90FD;&#x5BE6;&#x73FE;&#x4E00;&#x500B;&#x5171;&#x540C;&#x7684;&#x63A5;&#x53E3;&#xFF0C;&#x537D;&#x7576;&#x5B83;&#x5011;&#x88AB;&#x8ABF;&#x7528;&#x9700;&#x8981;&#x4E00;&#x500B;&#x6A19;&#x6E96;&#x6D41;&#x8F38;&#x51FA;&#x6642;&#x90FD;&#x53EF;&#x4EE5;&#x6EFF;&#x8DB3;&#x3002;&#x9019;&#x500B;&#x63A5;&#x53E3;&#x53EB;&#x4F5C;io.Writer&#xFF0C;&#x5728;7.1&#x7BC0;&#x4E2D;&#x6703;&#x8A73;&#x7D30;&#x8A0E;&#x8AD6;&#x3002;</p>
<p>Go&#x8A9E;&#x8A00;&#x7684;&#x63A5;&#x53E3;&#x6A5F;&#x88FD;&#x6703;&#x5728;&#x7B2C;7&#x7AE0;&#x4E2D;&#x8B1B;&#x89E3;&#xFF0C;&#x7232;&#x4E86;&#x5728;&#x9019;&#x91CC;&#x7C21;&#x55AE;&#x8AAC;&#x660E;&#x63A5;&#x53E3;&#x80FD;&#x505A;&#x4EC0;&#x9EBD;&#xFF0C;&#x8B93;&#x6211;&#x5011;&#x7C21;&#x55AE;&#x5730;&#x5C07;&#x9019;&#x91CC;&#x7684;web&#x670D;&#x52D9;&#x5668;&#x548C;&#x4E4B;&#x524D;&#x5BEB;&#x7684;lissajous&#x51FD;&#x6578;&#x7D50;&#x5408;&#x8D77;&#x4F86;&#xFF0C;&#x9019;&#x6A23;GIF&#x52D5;&#x7575;&#x53EF;&#x4EE5;&#x88AB;&#x5BEB;&#x5230;HTTP&#x7684;&#x5BA2;&#x6236;&#x7AEF;&#xFF0C;&#x800C;&#x4E0D;&#x662F;&#x4E4B;&#x524D;&#x7684;&#x6A19;&#x6E96;&#x8F38;&#x51FA;&#x6D41;&#x3002;&#x96BB;&#x8981;&#x5728;web&#x670D;&#x52D9;&#x5668;&#x7684;&#x4EE3;&#x78BC;&#x91CC;&#x52A0;&#x5165;&#x4E0B;&#x9762;&#x9019;&#x5E7E;&#x884C;&#x3002;</p>
2015-12-24 06:47:06 +00:00
<pre><code class="lang-Go">handler := <span class="hljs-keyword">func</span>(w http.ResponseWriter, r *http.Request) {
lissajous(w)
2015-12-09 07:57:17 +00:00
}
2015-12-24 06:47:06 +00:00
http.HandleFunc(<span class="hljs-string">&quot;/&quot;</span>, handler)
</code></pre>
<p>&#x6216;&#x8005;&#x53E6;&#x4E00;&#x7A2E;&#x7B49;&#x50F9;&#x5F62;&#x5F0F;&#xFF1A;</p>
<pre><code class="lang-Go">http.HandleFunc(<span class="hljs-string">&quot;/&quot;</span>, <span class="hljs-keyword">func</span>(w http.ResponseWriter, r *http.Request) {
2015-12-09 07:57:17 +00:00
lissajous(w)
})
2015-12-24 06:47:06 +00:00
</code></pre>
<p>HandleFunc&#x51FD;&#x6578;&#x7684;&#x7B2C;&#x4E8C;&#x500B;&#x53C3;&#x6578;&#x662F;&#x4E00;&#x500B;&#x51FD;&#x6578;&#x7684;&#x5B57;&#x9762;&#x503C;&#xFF0C;&#x4E5F;&#x5C31;&#x662F;&#x4E00;&#x500B;&#x5728;&#x4F7F;&#x7528;&#x6642;&#x5B9A;&#x7FA9;&#x7684;&#x533F;&#x540D;&#x51FD;&#x6578;&#x3002;&#x9019;&#x4E9B;&#x5167;&#x5BB9;&#x6211;&#x5011;&#x6703;&#x5728;5.6&#x7BC0;&#x4E2D;&#x8B1B;&#x89E3;&#x3002;</p>
<p>&#x505A;&#x5B8C;&#x9019;&#x4E9B;&#x8129;&#x6539;&#x4E4B;&#x5F8C;&#xFF0C;&#x5728;&#x700F;&#x89BD;&#x5668;&#x91CC;&#x8A2A;&#x554F; <a href="http://localhost:8000" target="_blank">http://localhost:8000</a> &#x3002;&#x6BCF;&#x6B21;&#x4F60;&#x8F09;&#x5165;&#x9019;&#x500B;&#x9801;&#x9762;&#x90FD;&#x53EF;&#x4EE5;&#x770B;&#x5230;&#x4E00;&#x500B;&#x50CF;&#x5716;1.3&#x90A3;&#x6A23;&#x7684;&#x52D5;&#x7575;&#x3002;</p>
<p><strong>&#x7DF4;&#x7FD2; 1.12&#xFF1A;</strong> &#x8129;&#x6539;Lissajour&#x670D;&#x52D9;&#xFF0C;&#x5F9E;URL&#x8B80;&#x53D6;&#x8B8A;&#x91CF;&#xFF0C;&#x6BD4;&#x5982;&#x4F60;&#x53EF;&#x4EE5;&#x8A2A;&#x554F; <a href="http://localhost:8000/?cycles=20" target="_blank">http://localhost:8000/?cycles=20</a> &#x9019;&#x500B;URL&#xFF0C;&#x9019;&#x6A23;&#x8A2A;&#x554F;&#x53EF;&#x4EE5;&#x5C07;&#x7A0B;&#x5E8F;&#x91CC;&#x7684;cycles&#x9ED8;&#x8A8D;&#x7684;5&#x8129;&#x6539;&#x7232;20&#x3002;&#x5B57;&#x7B26;&#x4E32;&#x8F49;&#x63DB;&#x7232;&#x6578;&#x5B57;&#x53EF;&#x4EE5;&#x8ABF;&#x7528;strconv.Atoi&#x51FD;&#x6578;&#x3002;&#x4F60;&#x53EF;&#x4EE5;&#x5728;dodoc&#x91CC;&#x67FB;&#x770B;strconv.Atoi&#x7684;&#x8A73;&#x7D30;&#x8AAC;&#x660E;&#x3002;</p>
<p><img src="../images/ch1-03.png" alt=""></p>
2015-12-09 07:57:17 +00:00
</section>
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