JAVA 面试题：替换文本文件里的制定字符串

package testJava;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.util.ArrayList;

import java.util.Iterator;

public class ReplaceString {

public static void main(String[] args) {

File file = new File("c:\\test.txt");

ArrayList<String> content = new ArrayList<String>();

try {

InputStreamReader in = new InputStreamReader(new FileInputStream(file), "UTF-8");

BufferedReader read = new BufferedReader(in);

String line = null;

while ((line = read.readLine()) != null) {

line = line.replaceAll("OldString", "NewString");

content.add(line);

}

read.close();

OutputStreamWriter out = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");

BufferedWriter write = new BufferedWriter(out);

Iterator<String> cont = content.iterator();

while (cont.hasNext()) {

write.write(cont.next()+"\r\n");

}

write.close();

} catch (Exception e) {

e.printStackTrace();

}

System.out.println("Completed!");

}

}