Question

使用JAVA，TCP协议上传文件的到server端的演示案例，问题是上传完事的txt文件为什么丢失了十几个字节？？

客户端代码：
package study.IP;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

public class UploadClient {

/**
* @param args
* @throws IOException
* @throws UnknownHostException
*/
public static void main(String[] args) throws UnknownHostException, IOException {
/*
* upload file to server
*
*/
//1.创建一个socket 流
Socket s = new Socket("192.168.1.200",10005);

//2.创建一个文件录取流读取流
BufferedReader bufr = new BufferedReader(new FileReader("C:\\domain.txt"));

//3.获取一个写入socket流：

PrintWriter out = new PrintWriter(s.getOutputStream(),true);

//4.while 循环读取 写入;
String line = null;
while((line = bufr.readLine())!=null){
out.println(line);
}

s.shutdownOutput(); // 发送一个结束标记；

System.out.println("over");

bufr.close();
s.close();

}

}
------------------------------------------------------------------------
server端的接受代码：
package study.IP;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.ServerSocket;
import java.net.Socket;

public class UploadServer {

/**
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {

//1. 创建socket对象
ServerSocket ss = new ServerSocket(10005);
Socket s = ss.accept();
System.out.println(s.getInetAddress().getHostAddress()+"....connected....");

//2.读取socket流中数据
BufferedReader bfr = new BufferedReader(new InputStreamReader(s.getInputStream()));

//3. 写入本地文件
BufferedWriter bfw = new BufferedWriter(new FileWriter("C:\\upload.txt"));

//4.循环读取
String line = null;
while((line = bfr.readLine())!=null){

bfw.write(line);
bfw.newLine();
bfw.flush();

}
System.out.println("上传结束了");
s.close();
ss.close();

}

}
=====================================
为什么上传后文件会丢失字节呢？？？求大神帮主

Answer 1

s.shutdownOutput(); // 发送一个结束标记；这句代码之前加上
out.flush();
try {Thread.sleep(2000);} catch (Exception e) {}