关于tcp套接字得到输入输出流的问题
刚学到java网络编程，想用tcp做一个类似ftp文件传输的东西。结果发现建立了tcp连接却只能传输一次。再次传输的时候提示 Socket is closed。让我很纠结~~查了半天百度，貌似是socket的getInputStream（）得到的流被关闭了导致的~~各位大大有什么解决办法~~
代码如下：
server端
- Java code
import java.io.*;import java.net.*;public class Server implements Runnable{ ServerSocket ser = null; int port = 6666; BufferedReader br = null; BufferedWriter bw = null; Socket soc = null; File file_send = null; File file_receive = null; InputStream ips = null; OutputStream ops = null; public void StartServer() { try { ser = new ServerSocket(port); while (true) { soc = ser.accept(); System.out.println("链接已建立！"); //Thread thread = new Thread(this); //thread.start(); } } catch (IOException e) { System.out.println("ServerSocket创建失败！检查端口是否被占用"); e.printStackTrace(); } } ////////////////接收//////////////// public void receive() { try { ips = soc.getInputStream(); file_receive = new File("D:/hello.java"); br = new BufferedReader(new InputStreamReader(ips)); bw = new BufferedWriter(new FileWriter(file_receive)); String s = null; while ((s = br.readLine()) != null) { bw.write(s); bw.newLine(); } bw.flush(); br.close(); bw.close(); } catch (IOException e) { e.printStackTrace(); } System.out.println("文件接收已完成！"); }/////////////////////发送///////////////////////// public void send(){ try { ops = soc.getOutputStream(); file_send = new File("D:/dos命令参数.txt"); bw = new BufferedWriter(new OutputStreamWriter(ops)); br = new BufferedReader(new FileReader(file_send)); String s = null; while((s = br.readLine()) != null){ bw.write(s,0,s.length()); bw.newLine(); } System.out.println("文件发送已完成！"); bw.flush(); br.close(); bw.close(); } catch (IOException e) { e.printStackTrace(); } } @Override public void run() { send(); receive(); } }client端
- Java code
package com.yao;import java.io.*;import java.net.*;public class Client { public int port = 6666; public String host = "127.0.0.1"; Socket soc = null; File file_receive = null; File file_send = null; BufferedReader br = null; BufferedWriter bw = null; OutputStream ops = null; InputStream ips = null; /////////////建立连接///////////// public void Connect(){ try { soc = new Socket(host,port); } catch (UnknownHostException e) { System.out.println("无法在主机号："+host+"创建监听！"); e.printStackTrace(); } catch (IOException e) { System.out.println("无法在端口"+port+"添加监听"); e.printStackTrace(); } } ////////////////发送///////////////////////// public void send(){ try { ops = soc.getOutputStream(); file_send = new File("D:/Hello.txt"); br = new BufferedReader(new FileReader(file_send)); bw = new BufferedWriter(new OutputStreamWriter(ops)); String s = null; while((s = br.readLine()) != null){ bw.write(s,0,s.length()); bw.newLine(); } System.out.println("文件发送已完成！"); bw.flush(); br.close(); bw.close(); } catch (IOException e) { e.printStackTrace(); } } /////////////////////接收///////////////////// public void receive() { try { ips = soc.getInputStream(); file_receive = new File("D:/dos命令参数.java"); br = new BufferedReader(new InputStreamReader(ips)); bw = new BufferedWriter(new FileWriter(file_receive)); String s = null; while ((s = br.readLine()) != null) { bw.write(s); bw.newLine(); } bw.flush(); br.close(); bw.close(); } catch (IOException e) { e.printStackTrace(); } System.out.println("文件接收已完成！"); } }
[解决办法]
因为你在发送文件的时候,直接把bw给关闭了,这样导致socket关闭,然后在接收的时候就会出现问题,而且你的server和client都不严谨,server程序很明显在并发的时候会出错,线程不能这样些,顺便附上我简单修改过的,表达能力不行,希望你能理解
Server
- Java code
package server;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.ServerSocket;import java.net.Socket;public class Server { private int port; Server(int port) { this.port = port; } public void StartServer() { try { ServerSocket server = new ServerSocket(port); while (true) { try{ new Thread(new ServerProcess(server.accept())).start(); }catch(Exception ex){ ex.printStackTrace(); } } } catch (IOException e) { System.out.println("ServerSocket创建失败！检查端口"+port+"是否被占用"); e.printStackTrace(); } }}class ServerProcess implements Runnable{ private static final String SEND_PATH = "D:/dos命令参数.txt"; //发送文件路径 private static final String RECV_PATH = "D:/hello.java"; //接收文件路径 private InputStream in; private OutputStream out; ServerProcess(Socket socket) { try { in = socket.getInputStream(); out = socket.getOutputStream(); } catch (IOException e) { e.printStackTrace(); throw new RuntimeException("socket 错误!"); } } ////////////////接收//////////////// private void receive() { FileOutputStream fileOut = null; try { File file_receive = new File(RECV_PATH); fileOut = new FileOutputStream(file_receive); pipe(fileOut,in); } catch (IOException e) { e.printStackTrace(); }finally{ if(null != fileOut){ try { fileOut.close(); } catch (IOException e) { e.printStackTrace(); } } } System.out.println("文件接收已完成！"); } private void pipe(OutputStream out,InputStream in) throws IOException { byte[] buf = new byte[512]; int len = 0; while((len = in.read(buf)) != -1) { out.write(buf,0,len); } }/////////////////////发送///////////////////////// private void send(){ FileInputStream fileIn = null; try { File file_send = new File(SEND_PATH); fileIn = new FileInputStream(file_send); pipe(out,fileIn); System.out.println("文件发送已完成！"); } catch (IOException e) { e.printStackTrace(); }finally{ if(null != fileIn) { try { fileIn.close(); } catch (IOException e) { e.printStackTrace(); } } } } @Override public void run() { try{ send(); receive(); }finally{ try { in.close(); } catch (IOException e) { e.printStackTrace(); }finally{ try { out.close(); } catch (IOException e) { e.printStackTrace(); } } } }}
[解决办法]