黑马程序员--第二十四天：网络编程第二天

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//24-1import java.io.*;import java.net.*;class PicClient{public static void main(String[] args) throws Exception{Socket s = new Socket("First-PC",10007);FileInputStream fis = new FileInputStream("cover.png");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();//out.write(1);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();}}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){//String str = new String(buf,0,buf.length);//if(len == 1)//break;fos.write(buf,0,len);}OutputStream out = s.getOutputStream();out.write("上传成功".getBytes());fos.close();s.close();ss.close();}}//程序始终有个莫名其妙的问题，就是不知道怎么解决//该原因是由于联网造成的，可能是连上互联网后客户端和服务器不应直接的在同一机子上运行。//24-2import java.io.*;import java.net.*;class PicClient2{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("该文件不存在");return;}if (!file.getName().endsWith(".jpg")){System.out.println("请选择JPG图片");return;}if (file.length()>1024*1024){System.out.println("请选择不大于1M的图片");return;}Socket s = new Socket("First-PC",10008);FileInputStream fis = new FileInputStream("cover.png");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();//out.write(1);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();}}class PicServer2{public static void main(String[] args) throws Exception{ServerSocket ss = new ServerSocket(10008);Socket s;while(true){s = ss.accept();new Thread(new PicThread(s)).start();}}}class PicThread implements Runnable{private Socket s;public PicThread(Socket s){this.s = s;}public void run (){InputStream in = null;FileOutputStream fos = null;int count = 0;try{String ip = s.getInetAddress().getHostAddress();//System.out.println(s);System.out.println(ip);in = s.getInputStream();File file = new File("server("+(count)+").bmp");while(file.exists())file = new File("server("+(count++)+").bmp");fos = new FileOutputStream(file);byte[] buf = new byte[1024];int len = 0;while ((len=in.read(buf))!=-1){//String str = new String(buf,0,buf.length);//if(len == 1)//break;fos.write(buf,0,len);}OutputStream out = s.getOutputStream();out.write("上传成功".getBytes());}catch (Exception e){throw new RuntimeException("上传失败");}finally{try{if(fos != null)fos.close();}catch (Exception e){throw new RuntimeException("fos 关闭失败");}try{if(s != null)s.close();}catch (Exception e){throw new RuntimeException("s 关闭失败");}}//ss.close();}}//24-3import java.net.*;import java.io.*;class LoginClient {public static void main(String[] args) throws Exception{Socket s = new Socket("First-PC", 10009);BufferedReader br = new BufferedReader(new InputStreamReader(System.in));BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));PrintWriter out = new PrintWriter(s.getOutputStream(),true);for (int i=0;i<3 ;i++ ){String line = br.readLine();if(line == null)break;out.println(line);String info = in.readLine();System.out.println("info:"+info);if(info.contains("欢迎"))break;}br.close();s.close();//System.out.println("Hello World!");}}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);BufferedReader br = null;try{for (int i =0;i<3 ;i++ ){BufferedReader in = new BufferedReader(new InputStreamReader(s.getInputStream()));String name = in.readLine();if(name==null)break;br = new BufferedReader(new FileReader("user.txt"));PrintWriter out = new PrintWriter(s.getOutputStream(),true);String line = null;boolean flag = false;while ((line = br.readLine())!=null){if(line.equals(name)){flag = true;break;}}if(flag){System.out.println(name+" 已登入");out.println(name+ " 欢迎光临");break;}else{System.out.println(name+" 尝试登入");out.println(name+" 用户不存在");}}s.close();}catch (Exception e){throw new RuntimeException(ip+" 校验失败");}finally{try{if(br!=null)br.close();}catch (Exception e){throw new RuntimeException("br 关闭失败");}}}}class LoginServer{public static void main(String[] args) throws Exception{ServerSocket ss = new ServerSocket(10009);while(true){Socket s = ss.accept();new Thread(new UserThread(s)).start();}}}//24-4import java.net.*;import java.io.*;class ServerDemo {public static void main(String[] args) throws Exception{ServerSocket ss = new ServerSocket(10010);Socket s = ss.accept();System.out.print(s.getInetAddress().getHostAddress());PrintWriter out = new PrintWriter(s.getOutputStream(),true);out.println(")--(");s.close();ss.close();System.out.println("Hello World!");}}//24-6_7import java.awt.*;import java.awt.event.*;import java.io.*;import java.net.*;class  MyIE{private Frame f;private TextField tf;private Button b;private TextArea ta;private Dialog d; private Button okb;private Label l;MyIE(){init();}public void init(){f = new Frame("my window");f.setBounds(300,300,600,500);f.setLayout(new FlowLayout());d = new Dialog(f,"show",true);l = new Label();okb = new Button("OK");d.setBounds(350,350,200,100);d.setLayout(new FlowLayout());tf = new TextField(180);b = new Button("button");ta = new TextArea(100,180);f.add(tf);f.add(b);f.add(ta);myEvent();f.setVisible(true);}private void myEvent(){f.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}});b.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){showDialog();}});okb.addActionListener(new ActionListener(){public void actionPerformed(ActionEvent e){d.setVisible(false);}});tf.addKeyListener(new KeyAdapter(){public void keyPressed(KeyEvent e){if(e.getKeyCode()==KeyEvent.VK_ENTER)showDialog();}});}public void showDialog(){try{ta.setText("");//String urlPath = tf.getText();//URL url = new URL(urlPath);//URLConnection conn = url.openConnection();System.out.println(conn);InputStream in = conn.getInputStream();byte[] buf = new byte[1024];int len = in.read(buf);ta.setText(new String(buf,0,len));//}catch (Exception e){}}public static void main(String[] args) {new MyIE();//System.out.println("Hello World!");}}//24-8import java.net.*;import java.io.*;class URLConnectionDemo {public static void main(String[] args) throws Exception{URL url = new URL("http://localhost/");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));}}//24-8import java.net.*;class URLDemo {public static void main(String[] args) throws MalformedURLException{URL url = new URL("http://localhost/");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 = url.getPort();if(port == -1)port = 80;}}域名解析：C:\Windows\System32\drivers\etc\hosts

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