import java.io.*; import java.net.*; /* *发送端 */ class picsend { public static void main(String[] args) throws Exception { if(args.length!=1) { System.out.println("请选择一张.jpg图片"); return; } File file = new File(args[0]); if (!(file.exists() && file.isFile())) { System.out.println("图片有问题(不是文件或不存在)"); return; } if(!file.getName().endsWith(".jpg")) { System.out.println("图片格式不对，请重新选择图片"); return; } if(file.length()>1024*1024*10) { System.out.println("图片过大，无法上传"); return; } Socket s = new Socket("192.168.33.1",10006);//建立服务 FileInputStream fis = new FileInputStream("d:\\美女.jpg");//读取图片 OutputStream out = s.getOutputStream();//读到的写入 byte [] b = new byte[1024]; int len = 0; while((len = fis.read(b))!= -1) { out.write(b,0,len); } s.shutdownOutput();//标记结束 InputStream in = s.getInputStream();//读服务端返回数据 byte [] bin = new byte[1024]; int num = in.read(bin); System.out.println(new String(bin,0,num)); fis.close(); s.close(); } } class picThread implements Runnable { private Socket s; picThread(Socket s) { this.s = s; } public void run() { int count = 1; String ip = s.getInetAddress().getHostAddress();//得到ip try { System.out.println(ip+".............connect"); InputStream in = s.getInputStream();//读到流中数据 File file = new File(ip+"("+(count)+")"+".jpg"); while(file.exists())//判断文件是否存在 file = new File(ip+"("+(count++)+")"+".jpg"); FileOutputStream fos = new FileOutputStream(file);//写入 byte [] b = new byte[1024]; int len = 0; while((len = in.read(b))!=-1) { fos.write(b,0,len); } OutputStream out = s.getOutputStream();//写入服务端传过来数据 out.write("上传成功！".getBytes()); fos.close(); s.close(); } catch (Exception e) { throw new RuntimeException("上传失败"); } } } /* *服务端 */ class picrece { public static void main(String[] args) throws Exception { ServerSocket ss = new ServerSocket(10006); while(true) { Socket s = ss.accept();//接收 new Thread(new picThread(s)).start(); } } }