IO(三、)不覆盖已有文件,并在已有文件末尾处

import java.io.FileWriter;

 import java.io.IOException;



 public class IODemo3 {

 public static void main(String[] args) {

//传递一个参数表示，不覆盖已有文件,并在已有文件末尾处

//进行数据的续写

FileWriter fw=null;

try {

fw = new FileWriter("G:\\demo.txt",true);

fw.write("你好\r\n哈喽");//windows里txt文件换行符\r\n


} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

System.out.println(e.toString());

}finally{

try {

if(fw!=null){

fw.close();

}


} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

System.out.println(e.toString());

}

}

 }

 }