//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();}
}