使用Tcp网络编程上传图片。

import java.io.File;

import java.io.FileOutputStream;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.ServerSocket;

import java.net.Socket;

public class JpgServer2 {

/**

* @param args

*/

public static void main(String[] args) throws Exception{

ServerSocket ss=new ServerSocket(9009);

while(true){

Socket s=ss.accept();

new Thread(new JpgThread(s)).start();

}

//ss.close();

}

}

class JpgThread implements Runnable{

private Socket s;

public JpgThread(Socket s){

this.s=s;

}

@Override

public void run() {

int count=1;

try{

String ip=s.getInetAddress().getHostAddress();

System.out.println(ip+"---connection");

InputStream in=s.getInputStream();

File dir=new File("c:");

File f=new File(dir,ip+"("+count+").jpg");

while(f.exists())

f=new File(dir,ip+"("+(count++)+").jpg");

FileOutputStream fos=new FileOutputStream(f);

byte[] buf=new byte[1024];

int len=0;

while((len=in.read(buf))!=-1){

fos.write(buf,0,len);

}

OutputStream out=s.getOutputStream();

out.write("上传成功了".getBytes());

fos.close();

s.close();

}catch(Exception e){

e.printStackTrace();

}

}

}

import java.io.File;

import java.io.FileInputStream;

import java.io.InputStream;

import java.io.OutputStream;

import java.net.Socket;

public class JpgClient2 {

/**

* @param args

*/

public static void main(String[] args)throws Exception {

if(args.length==0){

System.out.println("请指定一个jpg文件");

return;

}

File f=new File(args[0]);

Socket s=new Socket("192.168.49.205",9009);

FileInputStream fis=new FileInputStream(f);

OutputStream out=s.getOutputStream();

byte[] buf=new byte[1024];

int len=0;

while((len=fis.read(buf))!=-1){

out.write(buf, 0, len);

}

s.shutdownOutput();

InputStream in=s.getInputStream();

byte[] b=new byte[1024];

int num=in.read(b);

System.out.println(new String(b,0,num));

fis.close();

s.close();

}

}