Picses' sky

// instanceconcurrenttest.jsp
<%@ page contentType="text/html;charset=GBK" %>
<%! 
    //定義實例變量 
    String username; 
    String password;
    java.io.PrintWriter output;
%>
<% 
    //從request中獲取參數
    username = request.getParameter("username");
    password = request.getParameter("password");
    output = response.getWriter();
    showUserInfo(); 
 %>
 <%! 
    public void showUserInfo() {  
       //為了突出并發問題，在這兒首先執行一個費時操作  
       int i =0;  
       double sum = 0.0;  
       while (i++ < 200000000) {
             sum += i;  
       }    
       
       output.println(Thread.currentThread().getName() + "<br>");
       output.println("username:" + username + "<br>"); 
       output.println("password:" + password + "<br>"); 
    }
 %>

// InstanceConcurrentTest.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.PrintWriter;
public class InstanceConcurrentTest extends HttpServlet
 { 
      String username; 
      String password; 
      PrintWriter out; 
      public void doGet(HttpServletRequest request, 
       HttpServletResponse response)          
       throws ServletException,java.io.IOException 
       {  
           //從request中獲取參數  
    username = request.getParameter("username");
    password = request.getParameter("password"); 
    System.out.println(Thread.currentThread().getName() +
     " | set username:" + username);
    out = response.getWriter(); 
    showUserInfo();  
       } 
       public void showUserInfo() {  
           //為了突出并發問題，在這兒首先執行一個費時操作  
    int i =0;  
    double sum = 0.0;  
    while (i++ < 200000000) { 
      sum += i;  
    }  
    out.println("thread:" + Thread.currentThread().getName());
    out.println("username:"+ username); 
    out.println("password:" + password); 
 }
}

<%@ page contentType="text/html;charset=GBK" %>
<% 
    //使用局部變量
    String username;
    String password;
    java.io.PrintWriter output;
    //從request中獲取參數
    username = request.getParameter("username");
    password = request.getParameter("password");
    output = response.getWriter();
    showUserInfo(output, username, password);
%>
<%! 
    public void showUserInfo(java.io.PrintWriter _output,
     String _username, String _password) {
    //為了突出并發問題，在這兒首先執行一個費時操作
      int i =0; 
      double sum = 0.0; 
      while (i++ < 200000000) { 
        sum += i;  
      }    
      _output.println(Thread.currentThread().getName() + "<br>");
      _output.println("username:" + _username + "<br>");
      _output.println("password:" + _password + "<br>");
      }
%>