Java学习之TCP上传图片

import java.io.*;
import java.net.*;

class Client2 {
  public static void main(String[] args) throws Exception {
    
    File file = new File(args[0]);
    
    if (!file.exists() || file.isDirectory()) {
     	sopln("文件不存在或不是文件");
     	return;
    }
    
    if (!args[0].endsWith(".jpg")) {
     	sopln("图片格式错误，请上传jpg格式！");
     	return;
    }
    
    if (file.length() >= 1024*1024*5) {
     	sopln("图片过大！");
     	return;
    }   
    
    Socket s = new Socket("192.168.1.100", 10086);
    FileInputStream fis = new FileInputStream(file);
    OutputStream os = s.getOutputStream();
    InputStream is = s.getInputStream();
    byte[] buf = new byte[1024];
    int len = 0;
    while ((len=fis.read(buf)) != -1) {
    	os.write(buf, 0, len);
    }
    s.shutdownOutput();
    int num = is.read(buf);
    sopln(new String(buf, 0, num));
    fis.close();
    s.close();
  }

  public static void sopln(Object obj) {
    System.out.println(obj);
  }
}

class Server2 {
	public static void main(String[] args) throws Exception {
    ServerSocket ss = new ServerSocket(10086);
    while (true) {
    	Socket s = ss.accept();
    	new Thread(new PicThread(s)).start();
    }    
  }

  public static void sopln(Object obj) {
    System.out.println(obj);
  }	
}

class PicThread implements Runnable {
	private Socket s;
	
	PicThread(Socket s) {
		this.s = s;	
	}	
	
	public void run() {
		try {
			String ip = s.getInetAddress().getHostAddress();
			String name = s.getInetAddress().getHostName();
			InputStream is = s.getInputStream();
			int count = 1;
			File file = new File(name + ".jpg");
			while (file.exists()) {
			 	file = new File(name + "(" + (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 os = s.getOutputStream();
			os.write("上传成功".getBytes());
			fos.close();
			s.close();
		} catch (Exception e) {
		}	
	}
}