checklogin.java

JSP中session的建立和使用

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

public class checklogin extends HttpServlet{
		private Date LoginTime;
		private String str;
      	
  public void doGet(HttpServletRequest request,
                    HttpServletResponse response)
      throws ServletException, IOException {
      	
    
    response.setContentType("text/html;charset=GB2312");
   
    String   username=request.getParameter("username");
  
	username=new   String(username.getBytes("ISO-8859-1"),"GB2312");
    

    PrintWriter out = response.getWriter();
    
    if (username.equals(""))
    	response.sendRedirect("http://localhost:8080/myweb/login.html");
    	
    else
    {
    	HttpSession session=request.getSession();
    	session.setAttribute("name",username);
        response.sendRedirect("http://localhost:8080/myweb/servlet/index");
    }
  
    }
 }