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通过HttpServlet来开发servlet:
version 1.0 包含的功能:
    1、进行简单的用户验证
知识点:   
    1、如何使用servlet开发动态网页
    2、如何从一个页面跳转到另一个页面 response.sendRedirect(String)

代码:
/**
 * @(#)Login.java
 *
 *
 * 
@author 
 * 
@version 1.00 2008/7/20
 
*/

package com.keer2345;

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

public class Login extends HttpServlet {
    
    
public void doGet(HttpServletRequest request, HttpServletResponse response)    {
        
try    {
            
            response.setContentType(
"text/html;charset=utf-8");
            
            PrintWriter pw 
= response.getWriter();
            
            pw.println(
"<html>");
            pw.println(
"<body>");
            pw.println(
"<form action=loginCheck method=post>");
            pw.println(
"用户名:<input type=text name=username><br>");
            pw.println(
"密  码:<input type=password name=password><br>");
            pw.println(
"<input type=submit value=Login>");
            pw.println(
"</form>");
            pw.println(
"</body>");
            pw.println(
"</html>");
        }
        
catch(Exception ex){
            ex.printStackTrace();
        }
    }

     
public void doPost(HttpServletRequest request, HttpServletResponse response)    {
         
         
this.doGet(request,response);
         
     } 
    
}

/**
 * @(#)LoginCheck.java
 *
 *
 * 
@author 
 * 
@version 1.00 2008/7/20
 
*/

package com.keer2345;

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

public class LoginCheck extends HttpServlet {
    
    
public void doGet(HttpServletRequest request, HttpServletResponse response)    {
        
        
try {
            String username 
= request.getParameter("username");
            String password 
= request.getParameter("password");    
                
            response.setContentType(
"text/html;charset=utf-8");
            
            PrintWriter pw 
= response.getWriter();
                
            
if (username.equals("keer2345"&& password.equals("keer2345"))    {
                
                pw.println(
"<h1><center>Welcome!</center></h1>");
                pw.println("<center><a href=login>Try again!</a></center>");
                
            }    
else    {
                response.sendRedirect(
"login");
            }
                        
        }
        
catch (Exception ex) {
            ex.printStackTrace();
        }
    }
    
    
public void doPost(HttpServletRequest request, HttpServletResponse response)    {
         
         
this.doGet(request,response);
         
     }     
    
}

<?xml version="1.0" encoding="ISO-8859-1"?>

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
   xmlns:xsi
="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation
="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   version
="2.5">
        
    
<servlet>
        
<servlet-name>login</servlet-name>
        
<servlet-class>com.keer2345.Login</servlet-class>
    
</servlet>
    
    
<servlet-mapping>
        
<servlet-name>login</servlet-name>
        
<url-pattern>/login</url-pattern>
    
</servlet-mapping>
    
    
<servlet>
        
<servlet-name>check</servlet-name>
        
<servlet-class>com.keer2345.LoginCheck</servlet-class>
    
</servlet>
    
    
<servlet-mapping>
        
<servlet-name>check</servlet-name>
        
<url-pattern>/loginCheck</url-pattern>
    
</servlet-mapping>
    
</web-app>


posted on 2008-07-20 16:42 keer 阅读(292) 评论(0)  编辑  收藏 所属分类: Servlet 笔记

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