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import java.io.*;
/**
* Created by IntelliJ IDEA.
* User: gaoyong
* Date: 2012-8-9
* Time: 15:31:42
* To change this template use File | Settings | File Templates.
*/
public class ChangeText {
public static void main(String[] args) throws Exception {
FileReader reader=new FileReader("asd.txt");
BufferedReader br=new BufferedReader(reader);
FileWriter fw=new FileWriter("asd.txt.tmp");
String s="";
while((s=br.readLine())!=null){
System.out.println(""+s);
//下面的if语句 写自己的替换逻辑
if(s.equals("02 345")){
s="01 345";
}
fw.write(s);
fw.write("\r\n");
fw.flush();
}
br.close();
fw.close();
File renameFile=new File("asd.txt");
renameFile.delete(); //删掉原来的文件
File file=new File("asd.txt.tmp");
file.renameTo(renameFile); // 重命名文件
}
}