黑马程序员_java入门_网路编程_02

------- android培训、java培训、期待与您交流！ ----------

一.TCP上传图片

客户端

/*需求：上传图片。*//*客户端：1.服务端点。2.读取客户端已有的图片数据。3.通过socket输出流将数据发给服务端。4.读取服务端反馈信息。5.关闭。*/import java.net.*;import java.io.*;class PicClient{public static void main(String[] args)throws Exception {Socket s=new Socket("172.16.56.237",1005);FileInputStream fis=new FileInputStream("e:\\1.jpg");OutputStream out=s.getOutputStream();byte[] buf=new byte[1024];int len=0;while((len=fis.read(buf))!=-1){out.write(buf,0,len);}s.shutdownOutput();//告诉服务端数据已写完。（增加结束标记）InputStream in=s.getInputStream();byte[] bufIn=new byte[1024];int num=in.read(bufIn);System.out.println(new String(bufIn,0,num));fis.close();s.close();}}

服务端

/*服务端：*/import java.net.*;import java.io.*;class PicServer{public static void main(String[] args)throws Exception{ServerSocket ss=new ServerSocket(1005);Socket s=ss.accept();InputStream in=s.getInputStream();FileOutputStream fos=new FileOutputStream("f:\\server.jpg");byte[] buf=new byte[1024];int len=0;while((len=in.read(buf))!=-1){fos.write(buf,0,len);}OutputStream out=s.getOutputStream();out.write("图片已收到".getBytes());fos.close();s.close();ss.close();}}

二.同时多个客户上传图片

class PicThread implements Runnable{private Socket s;PicThread(Socket s){this.s=s;}public void run(){int count=1;String ip=s.getInetAddress().getHostAddress();try{System.out.println(ip+"..........connceted");InputStream in=s.getInputStream();//为了不覆盖File file=new File("f:\\"+ip+"("+(count)+")"+".jpg");while(file.exists())file=new File("f:\\"+ip+"("+(count++)+")"+".jpg");FileOutputStream fos=new FileOutputStream(file);byte[] buf=new byte[1024];int len=0;while((len=in.read(buf))!=-1){fos.write(buf,0,len);}OutputStream out=s.getOutputStream();out.write("图片已收到".getBytes());fos.close();s.close();}catch (Exception e){throw new RuntimeException(ip+"上传失败！");}}}class PicServer{public static void main(String[] args)throws Exception{ServerSocket ss=new ServerSocket(1005);while(true){Socket s=ss.accept();new Thread(new PicThread(s)).start();}}}

三.自定义服务端

ServerSocket ss=new ServerSocket(1005);  

Socket s=ss.accpet()

PrintWriter out=new PrintWriter(s.getOutPutStream(),true)

out.println("客服端是我")

四.Tomcat服务端

步骤：1.先运行服务端

2.自定义客户端访问

五.URL用处

/*通过URLConnection拆封：*/import java.awt.*;import java.awt.event.*;import java.io.*;import java.net.*;class MyIEByGUI{private Frame f;private TextField tf;private Button but;private TextArea ta;private Dialog d;private Label lab;private Button okBut;MyIEByGUI2(){init();}public void init(){f=new Frame("my window");f.setBounds(300,100,600,500);f.setLayout(new FlowLayout());tf=new TextField(60);but=new Button("转到");ta=new TextArea(25 ,70);//  行，列d=new Dialog(f,"提示信息",true);//第3个参数：指定在显示的时候是否阻止用户将内容输入到其他顶级窗口中。d.setBounds(400,200,240,150);d.setLayout(new FlowLayout());lab=new Label();okBut=new Button("确定");d.add(lab);d.add(okBut);f.add(tf);f.add(but);f.add(ta);myEvent();f.setVisible(true);}private void myEvent(){but.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){try{showDir();}catch (Exception ee){String info="您输入的地址是错误的，请重新输入！";lab.setText(info);d.setVisible(true);}}});f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});tf.addKeyListener(new KeyAdapter(){public void keyPressed(KeyEvent e){try{if(e.getKeyCode()==KeyEvent.VK_ENTER)showDir();}catch (Exception ee){String info="您输入的地址是错误的，请重新输入！";lab.setText(info);d.setVisible(true);}}});okBut.addKeyListener(new KeyAdapter(){public void keyPressed(KeyEvent e){if(e.getKeyCode()==KeyEvent.VK_ENTER)d.setVisible(false);}});d.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){d.setVisible(false);}});okBut.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){d.setVisible(false);}});}private void showDir()throws Exception{   ta.setText("");//清空String urlPath=tf.getText();//    http://172.16.56.237:8080/myweb/index.htmlURL url=new URL(urlPath);URLConnection conn=url.openConnection();InputStream in=conn.getInputStream();byte[] buf=new byte[1024];int len=in.read(buf);ta.setText(new String(buf,0,len));}public static void main(String[] args) {new MyIEByGUI();}}

ServerSocket(int port,int backlog)

port监听的服务所使用的接口

backlog最大连接数

六.域名解析

省略