将每一个Tab符换成四个空格

如果你想将一些java源文件中的每一个Tab符换成四个空格，那么下面程序将帮助你。

import java.io.*;

public class TabtoSpace{

public static void main(String args[]) throws Exception{

if(args.length!=2){

System.out.println("Use java TabToSpace inFile outFile");

System.exit(0);

}

BufferedReader br=new BufferedReader(new FileReader(args[0]));

BufferedWriter bw=new BufferedWriter(new FileWriter(args[1]));

String s; while(br.ready()){ s=br.readLine(); s=tabTospace(s); bw.write(s); bw.newLine(); } br.close(); bw.close(); } public static String tabTospace(String s){ if (s == null) { return null; } char ch; char[] input = s.toCharArray(); int len = input.length; StringBuffer out = new StringBuffer((int)(len*2));

[align=center][/align]

for (int i=0; i < len; i++) {

ch = input[i];

if (ch=='\t') {

for(int j=0;j<4;j++)

out.append(' ');

} else{

out.append(ch);

}

}

return out.toString();

}

}