update at 2021-08-12 23:15:14 by ehlxr

src/main/java/io/github/ehlxr/http/Main.java

@@ -26,9 +26,9 @@ package io.github.ehlxr.http;
 
 import java.io.IOException;
 import java.net.URI;
-import java.net.http.HttpClient;
+// import java.net.http.HttpClient;
-import java.net.http.HttpRequest;
+// import java.net.http.HttpRequest;
-import java.net.http.HttpResponse;
+// import java.net.http.HttpResponse;
 import java.time.Duration;
 
 /**
@@ -38,34 +38,34 @@ import java.time.Duration;
 public class Main {
     public static void main(String[] args) throws IOException, InterruptedException {
 
-        HttpClient client = HttpClient.newBuilder()
+        // HttpClient client = HttpClient.newBuilder()
-                .version(HttpClient.Version.HTTP_1_1)
+        //         .version(HttpClient.Version.HTTP_1_1)
-                .followRedirects(HttpClient.Redirect.NORMAL)
+        //         .followRedirects(HttpClient.Redirect.NORMAL)
-                .connectTimeout(Duration.ofSeconds(20))
+        //         .connectTimeout(Duration.ofSeconds(20))
-                // .proxy(ProxySelector.of(new InetSocketAddress("proxy.example.com", 80)))
+        //         // .proxy(ProxySelector.of(new InetSocketAddress("proxy.example.com", 80)))
-                // .authenticator(Authenticator.getDefault())
+        //         // .authenticator(Authenticator.getDefault())
-                .build();
+        //         .build();
-
+        //
-        HttpRequest request = HttpRequest.newBuilder()
+        // HttpRequest request = HttpRequest.newBuilder()
-                .uri(URI.create("https://ehlxr.me/"))
+        //         .uri(URI.create("https://ehlxr.me/"))
-                .timeout(Duration.ofMinutes(2))
+        //         .timeout(Duration.ofMinutes(2))
-                .header("Content-Type", "application/json")
+        //         .header("Content-Type", "application/json")
-                .GET()
+        //         .GET()
-                // .POST(HttpRequest.BodyPublishers.ofFile(Paths.get("file.json")))
+        //         // .POST(HttpRequest.BodyPublishers.ofFile(Paths.get("file.json")))
-                .build();
+        //         .build();
-
+        //
-        // Synchronous Example
+        // // Synchronous Example
-        // HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
+        // // HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
-        // System.out.println(response.statusCode());
+        // // System.out.println(response.statusCode());
-        // System.out.println(response.body());
+        // // System.out.println(response.body());
-
+        //
-
+        //
-        // Asynchronous Example
+        // // Asynchronous Example
-
+        //
-        client.sendAsync(request, HttpResponse.BodyHandlers.ofString())
+        // client.sendAsync(request, HttpResponse.BodyHandlers.ofString())
-                .thenApply(HttpResponse::body)
+        //         .thenApply(HttpResponse::body)
-                .thenAccept(body -> System.out.println("response body is:\n" + body))
+        //         .thenAccept(body -> System.out.println("response body is:\n" + body))
-                .join();
+        //         .join();
 
     }
 }

src/main/java/io/github/ehlxr/test/OOMTest.java

@@ -0,0 +1,56 @@
+/*
+ * The MIT License (MIT)
+ *
+ * Copyright © 2021 xrv <xrg@live.com>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+package io.github.ehlxr.test;
+
+import java.util.ArrayList;
+import java.util.Random;
+
+/**
+ * -Xms600m -Xmx600m -XX:SurvivorRatio=8 -XX:+PrintGCDetails -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/Users/ehlxr/Downloads/hprof/1.hprof
+ *
+ * @author ehlxr
+ * @since 2021-08-08 21:26.
+ */
+public class OOMTest {
+    public static void main(String[] args) {
+        ArrayList<Picture> list = new ArrayList<>();
+        while (true) {
+            try {
+                Thread.sleep(5);
+            } catch (InterruptedException e) {
+                e.printStackTrace();
+            }
+            list.add(new Picture(new Random().nextInt(100 * 50)));
+        }
+    }
+}
+
+class Picture {
+    private byte[] pixels;
+
+    public Picture(int length) {
+        this.pixels = new byte[length];
+    }
+}

src/main/java/io/github/ehlxr/test/StudentTrace.java

@@ -0,0 +1,111 @@
+package io.github.ehlxr.test;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 有一个学生浏览网页的记录程序，它将记录 每个学生访问过的网站地址。
+ * 它由三个部分组成：Student、WebPage和StudentTrace三个类
+ * <p>
+ * -XX:+HeapDumpBeforeFullGC -XX:HeapDumpPath=/Users/ehlxr/Downloads/hprof/student.hprof
+ *
+ * @author shkstart
+ * @create 16:11
+ */
+public class StudentTrace {
+    static List<WebPage> webpages = new ArrayList<WebPage>();
+
+
+    public static void createWebPages() {
+        for (int i = 0; i < 100; i++) {
+            WebPage wp = new WebPage();
+            wp.setUrl("http://www." + Integer.toString(i) + ".com");
+            wp.setContent(Integer.toString(i));
+            webpages.add(wp);
+        }
+    }
+
+    public static void main(String[] args) {
+        createWebPages();//创建了100个网页
+        //创建3个学生对象
+        Student st3 = new Student(3, "Tom");
+        Student st5 = new Student(5, "Jerry");
+        Student st7 = new Student(7, "Lily");
+
+        for (int i = 0; i < webpages.size(); i++) {
+            if (i % st3.getId() == 0)
+                st3.visit(webpages.get(i));
+            if (i % st5.getId() == 0)
+                st5.visit(webpages.get(i));
+            if (i % st7.getId() == 0)
+                st7.visit(webpages.get(i));
+        }
+        webpages.clear();
+        System.gc();
+
+    }
+}
+
+class Student {
+    private int id;
+    private String name;
+    private List<WebPage> history = new ArrayList<>();
+
+    public Student(int id, String name) {
+        super();
+        this.id = id;
+        this.name = name;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public void setId(int id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public List<WebPage> getHistory() {
+        return history;
+    }
+
+    public void setHistory(List<WebPage> history) {
+        this.history = history;
+    }
+
+    public void visit(WebPage wp) {
+        if (wp != null) {
+            history.add(wp);
+        }
+    }
+}
+
+
+class WebPage {
+    private String url;
+    private String content;
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+}

src/main/java/io/github/ehlxr/test/Test.java

@@ -24,6 +24,7 @@
 
 package io.github.ehlxr.test;
 
+import java.io.IOException;
 import java.util.Arrays;
 import java.util.LinkedHashMap;
 import java.util.List;
@@ -34,7 +35,7 @@ import java.util.stream.Collectors;
  * Created by ehlxr on 2016/12/15.
  */
 public class Test {
-    public static void main(String[] args) {
+    public static void main(String[] args) throws IOException {
         // String s0 = "kvill";
         // String s1 = "kvill";
         // String s2 = "kvill";
@@ -84,5 +85,7 @@ public class Test {
         System.out.println(s1 == s2);
         System.out.println(s == t);   // false
         System.out.println(s.intern() == t.intern());   // true
+
+        System.in.read();
     }
 }