//客户端部分package testSix;import java.awt.Graphics;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.InetAddress;import java.net.Socket;import java.util.Iterator;import javax.imageio.ImageIO;import javax.imageio.ImageReader;import javax.imageio.stream.ImageInputStream;import javax.swing.ImageIcon;import javax.swing.JFrame;import javax.swing.JPanel;class MyPanel extends JPanel{    private ImageIcon ii;    public MyPanel(ImageIcon ii){        this.ii = ii;    }        protected void paintComponent(Graphics g) {          super.paintComponent(g);          g.drawImage(ii.getImage(), 0, 0, 300, 400, this);      }}public class SocketDemo extends JFrame{      private Socket st = null;      public SocketDemo(){          try{              try{                  //建立客户端                  st =  new Socket(InetAddress.getLocalHost(), 10000);                                    //返回套接字具有关联的通道的输出流，则得到的输出流会将其所有操作委托给通道                  OutputStream os = st.getOutputStream();                  byte[] bt = "哥们儿， 给我来一张背景图片！".getBytes();                  os.write(bt);                                    //返回套接字具有关联的通道输入流，则得到的输入流会将其所有操作委托给通道                  InputStream is = st.getInputStream();                  int len = is.read(bt);                  System.out.println(new String(bt, 0, len));                                    //将输入流按照下面方式处理， 根据Iterator<ImageReader> itImage是否能                  //成功的返回一个ImageReader对象确认该流文件是否是一个图片文件！                  //并ImageReader类中的getFormatName（）得到文件的格式！                  //通过最后可以通过ImageIcon的byte[]构造函数建立ImageIcon对象！                  //最后将图片显示在面板上！                  ImageInputStream iis = ImageIO.createImageInputStream(is);                  Iterator<ImageReader> itImage = ImageIO.getImageReaders(iis);                  if(itImage.hasNext()){                      ImageReader reader = itImage.next();                      byte[] imageByte = new byte[102400*10];                      iis.read(imageByte);                      ImageIcon ii = new ImageIcon(imageByte, reader.getFormatName());                      add(new MyPanel(ii));                  }                                }finally{                    st.close();              }          }catch(IOException e){              e.printStackTrace();          }          setSize(300, 400);          setVisible(true);          setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);      }            public static void main(String[] args){          new SocketDemo();      }}

//服务端部分package testSix;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.ServerSocket;import java.net.Socket;public class ServerSocketDemo{    private ServerSocket sst = null;    private Socket st = null;    public ServerSocketDemo(){       try{            try {                    //建立服务端                    sst = new ServerSocket(10000);                                        //侦听并接受到此服务套接字的连接。此方法在进行连接之前一直阻塞。 创建新套接字                     st = sst.accept();                                        //得到客户端传输过来的流                    InputStream is = st.getInputStream();                    byte[] bt = new byte[1024];                    int len = is.read(bt);                    System.out.println(new String(bt, 0, len));                    OutputStream os  = st.getOutputStream();                    os.write("好了，知道了！".getBytes());                                        //将图片文件传输过去                    FileInputStream fis = new FileInputStream(new File("q12.jpg"));                    while((len = fis.read(bt)) != -1){//先将流文件变成byte[], 然后利用套接字的输出流发送给客户端                         os.write(bt);                         os.flush();                    }                            }finally{                    st.close();                    sst.close();            }       }catch(IOException e){           e.printStackTrace();       }            }        public static void main(String[] args){         new ServerSocketDemo();    }}