jsp 和 java console socket 的應用 ( jsp as client, java console as server)

小弟在網上搜尋了很多資源，但都很少有sample是教人用socket
在jsp網頁中和java console application 作傳送資料。
經小弟研究一翻後，終於獲得小小成果。


原理：
1. java console application 作為一個 server端，負責接收和即時顯示jsp傳送過來的data。
2. jsp 會使用socket 把 jsp 網頁中的textfield內容即時傳送到 java console application。


result:

java console application :
( 已接收data )

Jsp:
(按go後便會傳送"kelvin"一字)

-------------------------------------------------------------------------


Java console application code ( server ) 

/**
 *
 * @author kongyinlam
 */
import java.net.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;


class CServer_Recv extends Thread
{
   public void run()
   {
      byte buff[] = new byte[1024];
      try
      {
         ServerSocket svs = new ServerSocket(2526);
         SServer_rec.txa1.append("Client connecting for receiving successfully!!\n");
         System.out.println("Client connecting for receiving successfully!!");
        
        while(true)
         {
             Socket s=svs.accept();
             InputStream in=s.getInputStream();
             int n;
             try{
                  n=in.read(buff);
                  if(n!=-1){
                             SServer_rec.txa1.append("Client: "+new String(buff,0,n)+"\n");
                             System.out.print("Received from client: ");
                             System.out.print(new String(buff,0,n));
            }
           }
           catch(Exception ee){System.out.println(ee);}
        
         in.close();
         s.close();
         }
      }
      catch(Exception e)
      {
         System.out.println("Error:"+e);
      }
   }
}


// for GUI

public class SServer_rec
{
   static Frame frm=new Frame("JAVA Socket Server AWT Program");
   static Button btn1=new Button("Start");
   static Button btn2=new Button("Exit");
   static Label lab1=new Label("Host IP Address");
   static Label title=new Label("JSocket");
   static TextArea txa1=new TextArea("",6,10,TextArea.SCROLLBARS_VERTICAL_ONLY);
   static TextArea txa2=new TextArea("",6,10,TextArea.SCROLLBARS_NONE);
   static TextField txf1=new TextField("127.0.0.1");
  // static CServer_send ss=new CServer_send();
   static CServer_Recv sr=new CServer_Recv();
 
   public static void main (String[] args)
   {
     try
      {
         InetAddress adr=InetAddress.getLocalHost();
         txf1.setText(adr.getHostAddress());
         btn1.addActionListener(new ActLis());
         btn2.addActionListener(new ActLis());
         frm.addWindowListener(new WinLis());
       
         frm.setLayout(null);
         title.setBounds(20,40,75,40);
         btn1.setBounds(280,40,100,20);
         btn2.setBounds(280,65,100,20);
         frm.setBounds(100,100,400,300);
         frm.setBackground(new Color(151,255,255));
         lab1.setBounds(100,40,160,20);
         txa1.setBounds(20,95,360,140);
         txa2.setBounds(20,240,360,40);
         txf1.setBounds(100,65,160,20);
         txa1.setEditable(false);
         title.setFont(new Font("Serief",Font.BOLD+Font.ITALIC,18));
         title.setForeground(Color.BLUE);
         frm.add(title);
         frm.add(btn1);frm.add(btn2);
         frm.add(lab1);
         frm.add(txa1);frm.add(txa2);
         frm.add(txf1);
         frm.setVisible(true);
      }
      catch(Exception e)
      {
         System.out.println("Error:"+e);
      }
   }
 
   static class ActLis implements ActionListener
   {
      public void actionPerformed(ActionEvent e)
      {
         Button btn=(Button) e.getSource();
         if(btn==btn1)
         {
            txa1.setText("Waiting for connecting("+txf1.getText()+")...\n");
            System.out.println("Waiting for connecting...");
            txf1.setEditable(false);
            //ss.start();
            sr.start();
         }
         else if(btn==btn2)
            System.exit(0);
         else
            System.out.println("No Button Click!");
      }
   }
   static class WinLis extends WindowAdapter
   {
      public void windowClosing(WindowEvent e)
      {
         frm.dispose();
         System.exit(0);
      }
   }
   
}

Jsp code ( client ) 



* 2個jsp file, 1 for 界面, 另一個for socket

1. index.jsp

<%--
    Document   : main
    Created on : 2015/4/8, 下午 07:25:28
    Author     : Kong Yin Lam
--%>

<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
                 <form type="post" action="SocketClientSend.jsp">
                     <input name="text"></input>
                     <input type="submit" value="go"></input>
                  </form>
     
        <h1>Hello World!</h1>
    </body>

</html>

2. SocketClientSend.jsp   // for socket transfer data

<%--
    Document   : index
    Created on : 2015/4/8, 下午 06:04:02
    Author     : Kong Yin Lam
--%>

<%@page import="java.io.OutputStream"%>
<%@page import="java.io.InputStream"%>
<%@page import="java.net.Socket"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>JSP Page</title>
    </head>
    <body>
       <H1>Creating Client/Server Applications</H1>
        <%
        try{
         
           Socket s=new Socket("192.168.0.102", 2526);  // your ip, up to u
           System.out.println("Connected with server for sending successfully!!");
           System.out.println("Data transfering...");

           String str=request.getParameter("text");   // 取得index.jsp中的textfield內容
     
           
               OutputStream outed=s.getOutputStream();
       
               System.out.println("keeping connection!");
               outed.write(str.getBytes());
               System.out.println("Send:"+str);
               System.out.println("You: send");

             
        }
        catch(java.net.ConnectException e){}
        %>
             
       <% response.sendRedirect("index.jsp");   // back to index.jsp%>
   
    </body>

</html>

完成:D