黑马程序员---Java基础--24天(网络编程之二)

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1.网络编程(TCP-上传图片)

/*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.io.*;import java.net.*;class  PicClient{public static void main(String[] args)throws Exception {Socket s = new Socket("192.168.1.254",10007);FileInputStream fis = new FileInputStream("c:\\1.bmp");OutputStream out = s.getOutputStream();byte[] buf = new byte[1024];int len = 0;while((len=fis.read(buf))!=-1){out.write(buf,0,len);}//告诉服务端数据已写完s.shutdownOutput();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*/class  PicServer{public static void main(String[] args) throws Exception{ServerSocket ss = new ServerSocket(10007);Socket s = ss.accept();InputStream in = s.getInputStream();FileOutputStream fos = new FileOutputStream("server.bmp");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("上传成功".getBytes());fos.close();s.close();ss.close();}}

2.网络编程(TCP-客户端并发上传图片)

/*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.io.*;import java.net.*;class  PicClient{public static void main(String[] args)throws Exception {if(args.length!=1){System.out.println("请选择一个jpg格式的图片");return ;}File file = new File(args[0]);if(!(file.exists() && file.isFile())){System.out.println("该文件有问题，要么补存在，要么不是文件");return ;}if(!file.getName().endsWith(".jpg")){System.out.println("图片格式错误,请重新选择");return ;}if(file.length()>1024*1024*5){System.out.println("文件过大，没安好心");return ;}Socket s = new Socket("192.168.1.254",10007);FileInputStream fis = new FileInputStream(file);OutputStream out = s.getOutputStream();byte[] buf = new byte[1024];int len = 0;while((len=fis.read(buf))!=-1){out.write(buf,0,len);}//告诉服务端数据已写完s.shutdownOutput();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();}}/*服务端这个服务端有个局限性。当A客户端连接上以后。被服务端获取到。服务端执行具体流程。这时B客户端连接，只有等待。因为服务端还没有处理完A客户端的请求，还有循环回来执行下次accept方法。所以暂时获取不到B客户端对象。那么为了可以让多个客户端同时并发访问服务端。那么服务端最好就是将每个客户端封装到一个单独的线程中，这样，就可以同时处理多个客户端请求。如何定义线程呢？只要明确了每一个客户端要在服务端执行的代码即可。将该代码存入run方法中。*/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+"....connected");InputStream in = s.getInputStream();File dir =  new File("d:\\pic");File file = new File(dir,ip+"("+(count)+")"+".jpg");while(file.exists())file = new File(dir,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("上传成功".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(10007);while(true){Socket s = ss.accept();new Thread(new PicThread(s)).start();}//ss.close();}}

3.网络编程(TCP-客户端并发登录)

/*客户端通过键盘录入用户名。服务端对这个用户名进行校验。如果该用户存在，在服务端显示xxx，已登陆。并在客户端显示 xxx，欢迎光临。如果该用户存在，在服务端显示xxx，尝试登陆。并在客户端显示 xxx，该用户不存在。最多就登录三次。*/import java.io.*;import java.net.*;class  LoginClient{public static void main(String[] args) throws Exception{Socket s = new Socket("192.168.1.254",10008);BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));PrintWriter out = new PrintWriter(s.getOutputStream(),true);BufferedReader bufIn =new BufferedReader(new InputStreamReader(s.getInputStream()));for(int x=0; x<3; x++){String line = bufr.readLine();if(line==null)break;out.println(line);String info = bufIn.readLine();System.out.println("info:"+info);if(info.contains("欢迎"))break;}bufr.close();s.close();}}class UserThread implements Runnable{private Socket s;UserThread(Socket s){this.s = s;}public void run(){String ip = s.getInetAddress().getHostAddress();System.out.println(ip+"....connected");try{for(int x=0; x<3; x++){BufferedReader bufIn = new BufferedReader(new InputStreamReader(s.getInputStream()));String name = bufIn.readLine();if(name==null)break;BufferedReader bufr = new BufferedReader(new FileReader("user.txt"));PrintWriter out = new PrintWriter(s.getOutputStream(),true);String line = null;boolean flag = false;while((line=bufr.readLine())!=null){if(line.equals(name)){flag = true;break;}}if(flag){System.out.println(name+",已登录");out.println(name+",欢迎光临");break;}else{System.out.println(name+",尝试登录");out.println(name+",用户名不存在");}}s.close();}catch (Exception e){throw new RuntimeException(ip+"校验失败");}}}class  LoginServer{public static void main(String[] args) throws Exception{ServerSocket ss = new ServerSocket(10008);while(true){Socket s = ss.accept();new Thread(new UserThread(s)).start();}}}

4.网络编程(浏览器客户端-自定义服务端)

5.网络编程(浏览器客户端-Tomcat服务端)

/*演示客户端和服务端。1，客户端：浏览器 (telnet)服务端：自定义。2，客户端：浏览器。服务端：Tomcat服务器。3，客户端：自定义。(图形界面)服务端：Tomcat服务器。*/import java.net.*;import java.io.*;class ServerDemo {public static void main(String[] args) throws Exception{ServerSocket ss = new ServerSocket(11000);Socket s = ss.accept();System.out.println(s.getInetAddress().getHostAddress());InputStream in = s.getInputStream();byte[] buf = new byte[1024];int len = in.read(buf);System.out.println(new String(buf,0,len));PrintWriter out = new PrintWriter(s.getOutputStream(),true);out.println("<font color='red' size='7'>客户端你好</font>");s.close();ss.close();}}

6.网络编程(自定义浏览器-Tomcat服务端)

import java.io.*;import java.net.*;class MyIE {public static void main(String[] args)throws Exception {Socket s = new Socket("192.168.1.254",8080);PrintWriter out = new PrintWriter(s.getOutputStream(),true);out.println("GET /myweb/demo.html HTTP/1.1");out.println("Accept: */*");out.println("Accept-Language: zh-cn");out.println("Host: 192.168.1.254:11000");out.println("Connection: closed");out.println();out.println();BufferedReader bufr = new BufferedReader(new InputStreamReader(s.getInputStream()));String line = null;while((line=bufr.readLine())!=null){System.out.println(line);}s.close();}}/*http://192.168.1.254:11000/myweb/demo.htmlGET /myweb/demo.html HTTP/1.1Accept: application/x-shockwave-flash, image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, application/QVOD, application/QVOD,Accept-Language: zh-cnAccept-Encoding: gzip, deflateUser-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727)Host: 192.168.1.254:11000Connection: Keep-Alive*/

7.网络编程(自定义图形界面浏览器)

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;MyIEByGUI(){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);d = new Dialog(f,"提示信息-self",true);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(){okBut.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){d.setVisible(false);}});d.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){d.setVisible(false);}});tf.addKeyListener(new KeyAdapter(){public void keyPressed(KeyEvent e){try{if(e.getKeyCode()==KeyEvent.VK_ENTER)showDir();}catch (Exception ex){}}});but.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){try{showDir();}catch (Exception ex){}}});f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}private void showDir()throws Exception{ta.setText("");String url = tf.getText();//http://192.168.1.254:8080/myweb/demo.htmlint index1 = url.indexOf("//")+2;int index2 = url.indexOf("/",index1);String str = url.substring(index1,index2);String[] arr = str.split(":");String host = arr[0];int port = Integer.parseInt(arr[1]);String path = url.substring(index2);//ta.setText(str+"...."+path);Socket s = new Socket(host,port);PrintWriter out = new PrintWriter(s.getOutputStream(),true);out.println("GET "+path+" HTTP/1.1");out.println("Accept: */*");out.println("Accept-Language: zh-cn");out.println("Host: 192.168.1.254:11000");out.println("Connection: closed");out.println();out.println();BufferedReader bufr = new BufferedReader(new InputStreamReader(s.getInputStream()));String line = null;while((line=bufr.readLine())!=null){ta.append(line+"\r\n");}s.close();}public static void main(String[] args) {new MyIEByGUI();}}

8.网络编程(URL-URLConnection)

import java.net.*;class URLDemo {public static void main(String[] args) throws MalformedURLException{URL url = new URL("http://192.168.1.254/myweb/demo.html?name=haha&age=30");System.out.println("getProtocol() :"+url.getProtocol());System.out.println("getHost() :"+url.getHost());System.out.println("getPort() :"+url.getPort());System.out.println("getPath() :"+url.getPath());System.out.println("getFile() :"+url.getFile());System.out.println("getQuery() :"+url.getQuery());/*int port = getPort();if(port==-1)port = 80;getPort()==-1*/}}/* String getFile()           获取此 URL 的文件名。  String getHost()           获取此 URL 的主机名（如果适用）。  String getPath()           获取此 URL 的路径部分。  int getPort()           获取此 URL 的端口号。  String getProtocol()           获取此 URL 的协议名称。  String getQuery()           获取此 URL 的查询部 */import java.net.*;import java.io.*;class  URLConnectionDemo{public static void main(String[] args) throws Exception{URL url = new URL("http://192.168.1.254:8080/myweb/demo.html");URLConnection conn = url.openConnection();System.out.println(conn);InputStream in = conn.getInputStream();byte[] buf = new byte[1024];int len = in.read(buf);System.out.println(new String(buf,0,len));}}import java.awt.*;import java.awt.event.*;import java.io.*;import java.net.*;class  MyIEByGUI2{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);d = new Dialog(f,"提示信息-self",true);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(){okBut.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){d.setVisible(false);}});d.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){d.setVisible(false);}});tf.addKeyListener(new KeyAdapter(){public void keyPressed(KeyEvent e){try{if(e.getKeyCode()==KeyEvent.VK_ENTER)showDir();}catch (Exception ex){}}});but.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){try{showDir();}catch (Exception ex){}}});f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});}private void showDir()throws Exception{ta.setText("");String urlPath = tf.getText();//http://192.168.1.254:8080/myweb/demo.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 MyIEByGUI2();}}

9.网络编程(小知识点)

10.网络编程(域名解析)

import java.net.*;class ScanDemo {public static void main(String[] args) {for(int x=130; x<145; x++){try{Socket s = new Socket("192.168.1.254",x);System.out.println(x+"...open");}catch (Exception e){System.out.println(x+"...closed");}}}}

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