文本文件關鍵字替換(Java)

代碼實現如下：

import java.io.File;
import java.io.PrintWriter; import java.util.Scanner; public class FileReplaceKeywords { public static void main(String[] args) throws Exception { // 檢測參數 if (args.length != 4) { System.out .println("Usage:java FileReplaceKeywords sourceFile targetFile initWord newWord "); System.exit(0); } String sourceFile = args[0]; String targetFile = args[1]; String initWord = args[2]; String newWord = args[3]; File source = new File(sourceFile); File target = new File(targetFile); // 檢查文件是否存在 if (!source.exists()) { System.out.println("-- Sorry,source file：" + sourceFile + " can't be found. --"); System.exit(0); } Scanner input = new Scanner(source); PrintWriter writer = new PrintWriter(target); while (input.hasNext()) { String newStr = input.nextLine().replaceAll(initWord, newWord); writer.write(newStr + "\n"); } input.close(); writer.close(); System.out.println("--- finish ----"); } }

 

 

=========測試==========

 step1:

新建類，命名  

FileReplaceKeywords 

 

step2:

當前類路徑下增加測試文件 test.txt

how are you
how do you do
I am fine
where are you going now
who are you working for

 

 

step3:編譯后執行

result:

how are YOU
how do YOU do
I am fine
where are YOU going now
who are YOU working for