128 lines
4.7 KiB
Java
128 lines
4.7 KiB
Java
/*
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* The MIT License (MIT)
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*
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* Copyright © 2020 xrv <xrg@live.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package io.github.ehlxr;
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import java.io.*;
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/*
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* 替换文件（如果该文件含有子目录，则包括子目录所有文件）中某个字符串并写入新内容（Java代码实现）.
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*
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*原理：逐行读取源文件的内容，一边读取一边同时写一个*.tmp的文件。
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*当读取的行中发现有需要被替换和改写的目标内容‘行’时候，用新的内容‘行’替换之。
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*最终，删掉源文件，把*.tmp的文件重命名为源文件名字。
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*
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*注意！代码功能是逐行读取一个字符串，然后检测该字符串‘行’中是否含有替换的内容，有则用新的字符串‘行’替换源文件中该处整个字符串‘行’。没有则继续读。
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*注意！替换是基于‘行’，逐行逐行的替换！
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*
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* */
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public class Modify {
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private final String target;
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private final String newContent;
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private final String path;
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public Modify(String path, String target, String newContent) {
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// 操作目录。从该目录开始。该文件目录下及其所有子目录的文件都将被替换。
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this.path = path;
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// target:需要被替换、改写的内容。
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this.target = target;
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// newContent:需要新写入的内容。
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this.newContent = newContent;
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operation();
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}
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public static void main(String[] args) {
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//代码测试：假设有一个test文件夹，test文件夹下含有若干文件或者若干子目录，子目录下可能也含有若干文件或者若干子目录（意味着可以递归操作）。
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//把test目录下以及所有子目录下（如果有）中文件含有"hi"的字符串行替换成新的"hello,world!"字符串行。
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new Modify("/Users/ehlxr/WorkSpaces/budd/src/main/java/me/ehlxr/test.txt", "hi", "hello,world!");
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}
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private void operation() {
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File file = new File(path);
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opeationDirectory(file);
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}
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private void opeationDirectory(File file) {
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if (file.isFile()) {
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operationFile(file);
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}
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if (file.isDirectory()) {
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File[] files = file.listFiles();
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if (files != null) {
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for (File f : files) {
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opeationDirectory(f);
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}
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}
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}
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}
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private void operationFile(File file) {
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try {
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InputStream is = new FileInputStream(file);
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BufferedReader reader = new BufferedReader(
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new InputStreamReader(is));
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String filename = file.getName();
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// tmpfile为缓存文件，代码运行完毕后此文件将重命名为源文件名字。
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File tmpfile = new File(file.getParentFile().getAbsolutePath() + "\\" + filename + ".tmp");
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BufferedWriter writer = new BufferedWriter(new FileWriter(tmpfile));
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boolean flag = false;
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String str;
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while (true) {
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str = reader.readLine();
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if (str == null)
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break;
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if (str.contains(target)) {
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writer.write(newContent + "\n");
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flag = true;
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} else
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writer.write(str + "\n");
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}
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is.close();
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writer.flush();
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writer.close();
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if (flag) {
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file.delete();
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tmpfile.renameTo(new File(file.getAbsolutePath()));
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} else {
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tmpfile.delete();
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}
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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