黑马程序员---网络编程(TCP、MyIE、URL)
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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(); }}
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(); }}
自定义服务端
/*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(); }}
自定义IE
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.html int 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(); }}
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.html URL 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(); }}
URL
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 */
URLConnection
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)); }}
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