java TCP并发实现文件上传---转载（PS：适合java1.6之前）

/**

客户端

1、服务端点

2、读取客户端已有的文件数据

3、通过socket输出流发给服务端

4、读取服务端反馈信息

5、关闭

**/

import java.io.*;

import java.net.*;

class  UploadClient

{

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

{

if(args.length != 1)

{

System.out.println("未选择文件！！！");

return;

}

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

if(!(file.exists() && file.isFile()))

{

System.out.println("该文件不存在或者该文件不是一个文件！！！");

return;

}

if(!(file.getName().endsWith(".jpg")))

{

System.out.println("文件格式错误！！！");

return;

}

if(file.length() > 1024*1024*5)

{

System.out.println("文件太大！！！");

return;

}

Socket s = new Socket("202.194.240.74",4444);

FileInputStream fis = new FileInputStream(file);

OutputStream out = s.getOutputStream();

byte[] buf = new byte[1024];

int len = 0;

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

{

out.write(buf,0,len);//这一步有问题，怎么解决？

}

//数据已经完成的时候执行shutdownOutput

s.shutdownOutput();

InputStream is = s.getInputStream();

byte[] bufin = new byte[1024];

int lenin = is.read(bufin);

System.out.println(new String(bufin,0,lenin));

fis.close();

s.close();

}

}

/**

线程

*/

class UploadThread implements Runnable

{

private Socket s;

UploadThread(Socket S)

{

this.s = s;

}

public void run()

{

int count = 1;

String ip = "111";

try

{

System.out.println(ip+"连接");

InputStream is = s.getInputStream();

File file = new File(ip+"("+(count++)+")"+".jpg");

while(file.exists())

file = new File(ip+"("+(count++)+")"+".jpg");

FileOutputStream fos = new FileOutputStream(file);

byte[] buf = new byte[1024];

int len = 0;

while((len = is.read(buf))!=-1)

{

fos.write(buf,0,len);

}

OutputStream out = s.getOutputStream();

out.write("上传成功".getBytes());

fos.close();

s.close();

}

catch(Exception e)

{

throw new RuntimeException(ip+"上传失败"+e);

}

}

}

/**

服务器端

*/

class  UploadServer

{

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

{

ServerSocket ss = new ServerSocket(4444);

while(true)

{

Socket s = ss.accept();

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

}

}

}