代码实现：

HelloServlet

1 package servlet; 2  3 import java.io.IOException; 4 import java.io.PrintWriter; 5  6 import javax.servlet.ServletException; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse;10 //1.继承于HttpServlet11 public class HelloServlet extends HttpServlet {12 13     @Override14     protected void doGet(HttpServletRequest request, HttpServletResponse response)15             throws ServletException, IOException {16         // TODO Auto-generated method stub17         System.out.println("处理Get()请求...");18         //获得给浏览器输出的对象19         PrintWriter out =response.getWriter();20         //指定输出的文件类型，指定字符集21         response.setContentType("text/html;charset=utf-8");22         out.println("Hello Servlet!
");//html代码23     }24 25     @Override26     protected void doPost(HttpServletRequest request, HttpServletResponse response)27             throws ServletException, IOException {28         // TODO Auto-generated method stub29         System.out.println("处理Post()请求...");30         //获得给浏览器输出的对象31         PrintWriter out =response.getWriter();32         //指定输出的文件类型，指定字符集33         response.setContentType("text/html;charset=utf-8");34         out.println("Hello Servlet!
");//html代码35     }36 }

 

web.xml

1 
      2 
     
       3   
       4   
      
        5     
       
        index.jsp
        6   
       7    8   
      
        9   
       10     
       
        HelloServlet
       11     
       12     
       
        servlet.HelloServlet
           13   
      14   15   
      
       16     
       
        HelloServlet
       17     
       18     
       19     
       
        /servlet/HelloServlet
       20   
      21 
     

index.jsp

1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7  8  9   10     11     12     13     
     14     
     15     
         16     
     17     
     18     
     21   22   23   24   
第一个Servlet小例子
25   
     
26   
     27   Get方式请求HelloServlet
28   
     29   
     
      30       
      31   
     
  32   33 

 

 

 

1 package servlet; 2  3 import java.io.IOException; 4 import java.io.PrintWriter; 5  6 import javax.servlet.ServletException; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse;10 11 public class HelloServlet extends HttpServlet {12 13     /**14      * Constructor of the object.15      */16     public HelloServlet() {17         super();18     }19 20     /**21      * Destruction of the servlet. 
22      */23     public void destroy() {24         super.destroy(); // Just puts "destroy" string in log25         // Put your code here26     }27 28     /**29      * The doGet method of the servlet. 
30      *31      * This method is called when a form has its tag value method equals to get.32      * 33      * @param request the request send by the client to the server34      * @param response the response send by the server to the client35      * @throws ServletException if an error occurred36      * @throws IOException if an error occurred37      */38     public void doGet(HttpServletRequest request, HttpServletResponse response)39             throws ServletException, IOException {40         System.out.println("处理Get请求...");41         42         response.setContentType("text/html;charset=utf-8");43         PrintWriter out = response.getWriter();44         out.println("");45         out.println("");46         out.println("  ");47         out.println("  ");48         out.print("    This is ");49         out.print(this.getClass());50         out.println(", using the GET method");51         out.println("Hello Servlet!
");52         out.println("  ");53         out.println("");54         out.flush();55         out.close();56     }57 58     /**59      * The doPost method of the servlet. 
60      *61      * This method is called when a form has its tag value method equals to post.62      * 63      * @param request the request send by the client to the server64      * @param response the response send by the server to the client65      * @throws ServletException if an error occurred66      * @throws IOException if an error occurred67      */68     public void doPost(HttpServletRequest request, HttpServletResponse response)69             throws ServletException, IOException {70         System.out.println("处理Post请求...");71         72         response.setContentType("text/html;charset=utf-8");73         PrintWriter out = response.getWriter();74         out.println("");75         out.println("");76         out.println("  ");77         out.println("  ");78         out.print("    This is ");79         out.print(this.getClass());80         out.println(", using the POST method");81         out.println("Hello Servlet!
");82         out.println("  ");83         out.println("");84         out.flush();85         out.close();86     }87 88     /**89      * Initialization of the servlet. 
90      *91      * @throws ServletException if an error occurs92      */93     public void init() throws ServletException {94         // Put your code here95     }96 97 }

web.xml

1 
      2 
     
       6   
      
        7     
       
        This is the description of my J2EE component
        8     
       
        This is the display name of my J2EE component
        9     
       
        HelloServlet
       10     
       
        servlet.HelloServlet
       11   
      12 13   
      
       14     
       
        HelloServlet
       15     
       
        /servlet/HelloServlet
       16   
      17   18   
      
       19       
       
        index.jsp
       20   
      21 22 
     

index.jsp

1 <%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7  8  9   10     11     12     13     
     14     
     15     
         16     
     17     
     18     
     21   22   23   24    
使用MyEclipse创建Servlet小例子
25    
     
26    Get方式请求HelloServlet
27    
     
      28        
      29    
     
30   31 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 package servlet; 2  3 import java.io.IOException; 4 import java.io.PrintWriter; 5  6 import javax.servlet.ServletException; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse;10 11 public class TestServlet1 extends HttpServlet {12 13     /**14      * Constructor of the object.15      */16     public TestServlet1() {17         System.out.println("TestServlet1构造方法被执行...");18     }19 20     /**21      * Destruction of the servlet. 
22      */23     public void destroy() {24         System.out.println("TestServlet1销毁方法被执行...");25     }26 27     /**28      * The doGet method of the servlet. 
29      *30      * This method is called when a form has its tag value method equals to get.31      * 32      * @param request the request send by the client to the server33      * @param response the response send by the server to the client34      * @throws ServletException if an error occurred35      * @throws IOException if an error occurred36      */37     public void doGet(HttpServletRequest request, HttpServletResponse response)38             throws ServletException, IOException {39         40         System.out.println("TestServlet1的doGet方法被执行...");41         42         response.setContentType("text/html;charset=utf-8");43         PrintWriter out = response.getWriter();44         out.println("");45         out.println("");46         out.println("  ");47         out.println("  ");48         out.print("    This is ");49         out.print(this.getClass());50         out.println(", using the GET method");51         out.println("
大家好，我是TestServlet1！
");52         out.println("  ");53         out.println("");54         out.flush();55         out.close();56     }57 58     /**59      * The doPost method of the servlet. 
60      *61      * This method is called when a form has its tag value method equals to post.62      * 63      * @param request the request send by the client to the server64      * @param response the response send by the server to the client65      * @throws ServletException if an error occurred66      * @throws IOException if an error occurred67      */68     public void doPost(HttpServletRequest request, HttpServletResponse response)69             throws ServletException, IOException {70 71         System.out.println("TestServlet1的doPost方法被执行...");72         doGet(request,response);//让doPost执行与doGet()相同的操作73     }74 75     /**76      * Initialization of the servlet. 
77      *78      * @throws ServletException if an error occurs79      */80     public void init() throws ServletException {81         System.out.println("TestServlet1初始化方法被执行...");82     }83 84 }

 

package servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestServlet2 extends HttpServlet {    /**     * Constructor of the object.     */    public TestServlet2() {        System.out.println("TestServlet2构造方法被执行...");    }    /**     * Destruction of the servlet. 
     */    public void destroy() {        System.out.println("TestServlet2销毁方法被执行...");    }    /**     * The doGet method of the servlet. 
     *     * This method is called when a form has its tag value method equals to get.     *      * @param request the request send by the client to the server     * @param response the response send by the server to the client     * @throws ServletException if an error occurred     * @throws IOException if an error occurred     */    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {                System.out.println("TestServlet2的doGet方法被执行...");                response.setContentType("text/html;charset=utf-8");        PrintWriter out = response.getWriter();        out.println("");        out.println("");        out.println("  ");        out.println("  ");        out.print("    This is ");        out.print(this.getClass());        out.println(", using the GET method");        out.println("
大家好，我是TestServlet2！
");        out.println("  ");        out.println("");        out.flush();        out.close();    }    /**     * The doPost method of the servlet. 
     *     * This method is called when a form has its tag value method equals to post.     *      * @param request the request send by the client to the server     * @param response the response send by the server to the client     * @throws ServletException if an error occurred     * @throws IOException if an error occurred     */    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        System.out.println("TestServlet2的doPost方法被执行...");        doGet(request,response);//让doPost执行与doGet()相同的操作    }    /**     * Initialization of the servlet. 
     *     * @throws ServletException if an error occurs     */    public void init() throws ServletException {        System.out.println("TestServlet2初始化方法被执行...");    }}

 

     
       
        
          
       
        This is the description of my J2EE component
           
       
        This is the display name of my J2EE component
           
       
        TestServlet1
           
       
        servlet.TestServlet1
           
       
        2
         
        
          
       
        This is the description of my J2EE component
           
       
        This is the display name of my J2EE component
           
       
        TestServlet2
           
       
        servlet.TestServlet2
           
       
        1
         
        
          
       
        TestServlet1
           
       
        /servlet/TestServlet1
         
        
          
       
        TestServlet2
           
       
        /servlet/TestServlet2
         
            
          
       
        index.jsp
         
      
     

 

1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7  8  9   10     11     12     13     
     14     
     15     
         16     
     17     
     18     
     21   22   23   24     
Servlet生命周期
25     以Get方式请求TestServlet1
26     以Get方式请求TestServlet227   28 

 

 

 

 

 

1 package entity; 2  3 import java.util.Date; 4  5 public class Users { 6  7     private String username;//用户名 8     private String mypassword;//密码 9     private String email;//电子邮箱10     private String gender;//性别11     private Date birthday;//出生日期12     private String[] favorites;//爱好13     private String introduce;//自我介绍14     private boolean flag;//是否接受协议15     16     public Users()17     {18         19     }20 21     public String getUsername() {22         return username;23     }24 25     public void setUsername(String username) {26         this.username = username;27     }28 29     public String getMypassword() {30         return mypassword;31     }32 33     public void setMypassword(String mypassword) {34         this.mypassword = mypassword;35     }36 37     public String getEmail() {38         return email;39     }40 41     public void setEmail(String email) {42         this.email = email;43     }44 45     public String getGender() {46         return gender;47     }48 49     public void setGender(String gender) {50         this.gender = gender;51     }52 53     public Date getBirthday() {54         return birthday;55     }56 57     public void setBirthday(Date birthday) {58         this.birthday = birthday;59     }60 61     public String[] getFavorites() {62         return favorites;63     }64 65     public void setFavorites(String[] favorites) {66         this.favorites = favorites;67     }68 69     public String getIntroduce() {70         return introduce;71     }72 73     public void setIntroduce(String introduce) {74         this.introduce = introduce;75     }76 77     public boolean isFlag() {78         return flag;79     }80 81     public void setFlag(boolean flag) {82         this.flag = flag;83     }84     85 }

 

1 package servlet;  2   3 import java.io.IOException;  4 import java.io.PrintWriter;  5 import java.text.ParseException;  6 import java.text.SimpleDateFormat;  7 import java.util.Date;  8   9 import javax.servlet.ServletException; 10 import javax.servlet.http.HttpServlet; 11 import javax.servlet.http.HttpServletRequest; 12 import javax.servlet.http.HttpServletResponse; 13  14 import entity.Users; 15  16 public class RegServlet extends HttpServlet { 17  18     /** 19      * Constructor of the object. 20      */ 21     public RegServlet() { 22         super(); 23     } 24  25     /** 26      * Destruction of the servlet. 
 27      */ 28     public void destroy() { 29         super.destroy(); // Just puts "destroy" string in log 30         // Put your code here 31     } 32  33     /** 34      * The doGet method of the servlet. 
 35      * 36      * This method is called when a form has its tag value method equals to get. 37      *  38      * @param request the request send by the client to the server 39      * @param response the response send by the server to the client 40      * @throws ServletException if an error occurred 41      * @throws IOException if an error occurred 42      */ 43     public void doGet(HttpServletRequest request, HttpServletResponse response) 44             throws ServletException, IOException { 45  46         doPost(request,response); 47     } 48  49     /** 50      * The doPost method of the servlet. 
 51      * 52      * This method is called when a form has its tag value method equals to post. 53      *  54      * @param request the request send by the client to the server 55      * @param response the response send by the server to the client 56      * @throws ServletException if an error occurred 57      * @throws IOException if an error occurred 58      */ 59     public void doPost(HttpServletRequest request, HttpServletResponse response) 60             throws ServletException, IOException { 61  62         request.setCharacterEncoding("utf-8"); 63          64         Users u = new Users(); 65         String username,mypassword,gender,email,introduce,isAccept; 66         Date birthday; 67         String[] favorites; 68          69         SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd"); 70         try  71         { 72             username = request.getParameter("username");//返回指定参数的参数值 73             mypassword = request.getParameter("mypassword"); 74             gender = request.getParameter("gender"); 75             email = request.getParameter("email"); 76             introduce = request.getParameter("introduce"); 77             birthday = sdf.parse(request.getParameter("birthday"));//sdf.parse() 解析字符串的文本，生成 Date。 78             if(request.getParameterValues("isAccept")!=null) 79             { 80                 isAccept=request.getParameter("isAccept"); 81             } 82             else 83             { 84                 isAccept="false"; 85             } 86             //用来获取多个复选按钮的值 87             favorites = request.getParameterValues("favorite"); 88              89             u.setUsername(username); 90             u.setMypassword(mypassword); 91             u.setGender(gender); 92             u.setEmail(email); 93             u.setFavorites(favorites); 94             u.setIntroduce(introduce); 95              96             if(isAccept.equals("true")) 97             { 98                 u.setFlag(true); 99             }100             else101             {102                 u.setFlag(false);103             }104             u.setBirthday(birthday);105             //把注册成功的用户对象保存在session中106             request.getSession().setAttribute("regUser", u);//存储此请求中的属性107             //跳转到注册成功页面108             request.getRequestDispatcher("../userinfo.jsp").forward(request, response);//跳转到外层目录userinfo.jsp109         } catch (Exception ex) {110             // TODO Auto-generated catch block111             ex.printStackTrace();112         }113     }114 115     /**116      * Initialization of the servlet. 
117      *118      * @throws ServletException if an error occurs119      */120     public void init() throws ServletException {121         // Put your code here122     }123 124 }

web.xml

1 
      2 
     
       7   
       8   
      
        9     
       
        This is the description of my J2EE component
       10     
       
        This is the display name of my J2EE component
       11     
       
        RegServlet
       12     
       
        servlet.RegServlet
       13   
      14 15   
      
       16     
       
        RegServlet
       17     
       
        /servlet/RegServlet
       18   
          19   
      
       20     
       
        index.jsp
       21   
      22 
     

注册页面reg.jsp

1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>  2 <%  3 String path = request.getContextPath();  4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";  5 %>  6   7   8   9    10      11      12      13      14     
      15     
      16     
          17     
      18     
      19     
      22        30     31    32    33    34     
用户注册
 35     
     
 36     
     
       37               
      
        38                 
          39                     
 40                     
 41                 
 42                 
          43                     
 44                     
 45                      46                 
 47                 
          48                     
 49                     
 50                      51                 
 52                 
          53                     
 54                     
 55                      56                 
 57                 
          58                     
 59                     
 60                      61                 
 62                 63                 
          64                     
 65                     
 69                 
 70                 
          71                     
 72                     
 78                 
 79                 
          80                     
 81                     
 84                 
 85                 
          86                     
 87                     
 90                 
 91                 
          92                     
 96                 
 97               
       
        
         
用户名：
         
        
        
         
密码：
         
        
        
         
确认密码：
         
        
        
         
电子邮箱：
         
        
        
         
性别：
         
男女
        
        
         
出生日期：
         
 66                        68                     
        
        
         
爱好：
         
 73                      NBA   74                        音乐   75                        电影   76                        上网   77                     
        
        
         
自我介绍：
         
 82                          83                     
        
        
         
接受协议：
         
 88                         是否接受霸王条款 89                     
        
        
         
 93                            94                            95                     
        
       
      
 98             
     
 99   100 

注册成功页面userinfo.jsp

1 <%@ page language="java" import="java.util.*,java.text.*" contentType="text/html; charset=utf-8"%> 2  3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7  8  9 10   11     12     13     14     15     
     16     
     17     
         18     
     19     
     20     
     23       35   36   37   38     
用户信息
39     
     
40     
     
      41      
         42      
      
       43         
         44           
45           
46         
47         
         48           
49           
50         
51         
         52           
53           
54         
55         
         56           
57           
58         
59         
         60           
61           
69         
70         
         71           
72           
83         
84         
         85           
86           
87         
88         
         89           
90           
91         
92      
       
        
         
用户名：
         
 
          
        
        
         
密码：
         
 
          
        
        
         
性别：
         
 
          
        
        
         
E-mail：
         
 
          
        
        
         
出生日期：
         
 62             <% 63                SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");64                String date = sdf.format(regUser.getBirthday());65                66             %>67              <%=date%>68           
        
        
         
爱好：
         
 73             <% 74                String[] favorites = regUser.getFavorites();75                for(String f:favorites)76                {77             %>78                 <%=f%>   79             <% 80                }81             %>82           
        
        
         
自我介绍：
         
 
          
        
        
         
是否介绍协议：
         
 
          
        
       
      
93     
     94   95 

 

 

 

 

 

 

 

1 package servlet; 2  3 import java.io.IOException; 4 import java.io.PrintWriter; 5  6 import javax.servlet.ServletException; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse;10 11 public class HelloServlet extends HttpServlet {12 13     /**14      * Constructor of the object.15      */16     public HelloServlet() {17         super();18     }19 20     /**21      * Destruction of the servlet. 
22      */23     public void destroy() {24         super.destroy(); // Just puts "destroy" string in log25         // Put your code here26     }27 28     /**29      * The doGet method of the servlet. 
30      *31      * This method is called when a form has its tag value method equals to get.32      * 33      * @param request the request send by the client to the server34      * @param response the response send by the server to the client35      * @throws ServletException if an error occurred36      * @throws IOException if an error occurred37      */38     public void doGet(HttpServletRequest request, HttpServletResponse response)39             throws ServletException, IOException {40 41         doPost(request,response);42     }43 44     /**45      * The doPost method of the servlet. 
46      *47      * This method is called when a form has its tag value method equals to post.48      * 49      * @param request the request send by the client to the server50      * @param response the response send by the server to the client51      * @throws ServletException if an error occurred52      * @throws IOException if an error occurred53      */54     public void doPost(HttpServletRequest request, HttpServletResponse response)55             throws ServletException, IOException {56 57         response.setContentType("text/html;charset=utf-8");58         PrintWriter out = response.getWriter();59         out.println("");60         out.println("");61         out.println("  ");62         out.println("  ");63         out.print("    This is ");64         out.print(this.getClass());65         out.println(", using the POST method");66         out.println("
您好，我是HelloServlet!
");67         out.println("  ");68         out.println("");69         out.flush();70         out.close();71     }72 73     /**74      * Initialization of the servlet. 
75      *76      * @throws ServletException if an error occurs77      */78     public void init() throws ServletException {79         // Put your code here80     }81 82 }

 

1 package servlet; 2  3 import java.io.IOException; 4 import java.io.PrintWriter; 5  6 import javax.servlet.ServletException; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse;10 11 public class TestServlet extends HttpServlet {12 13     /**14      * Constructor of the object.15      */16     public TestServlet() {17         super();18     }19 20     /**21      * Destruction of the servlet. 
22      */23     public void destroy() {24         super.destroy(); // Just puts "destroy" string in log25         // Put your code here26     }27 28     /**29      * The doGet method of the servlet. 
30      *31      * This method is called when a form has its tag value method equals to get.32      * 33      * @param request the request send by the client to the server34      * @param response the response send by the server to the client35      * @throws ServletException if an error occurred36      * @throws IOException if an error occurred37      */38     public void doGet(HttpServletRequest request, HttpServletResponse response)39             throws ServletException, IOException {40 41         doPost(request,response);42     }43 44     /**45      * The doPost method of the servlet. 
46      *47      * This method is called when a form has its tag value method equals to post.48      * 49      * @param request the request send by the client to the server50      * @param response the response send by the server to the client51      * @throws ServletException if an error occurred52      * @throws IOException if an error occurred53      */54     public void doPost(HttpServletRequest request, HttpServletResponse response)55             throws ServletException, IOException {56 57         //请求重定向方式跳转到test.jsp，当前路径是ServletPathDirection/servlet/58         response.sendRedirect("test.jsp");//404错误59 //        response.sendRedirect("/test.jsp");//404错误60         //使用request.getContext获得上下文对象61 //        response.sendRedirect(request.getContextPath()+"/test.jsp");62         63         64         65         //服务器内部跳转，这里的斜线表示项目的根目录66 //        request.getRequestDispatcher("/test.jsp").forward(request, response);67 //        request.getRequestDispatcher("../test.jsp").forward(request, response);68         69     }70 71     /**72      * Initialization of the servlet. 
73      *74      * @throws ServletException if an error occurs75      */76     public void init() throws ServletException {77         // Put your code here78     }79 80 }

 

     
       
        
          
       
        This is the description of my J2EE component
           
       
        This is the display name of my J2EE component
           
       
        HelloServlet
           
       
        servlet.HelloServlet
         
        
          
       
        This is the description of my J2EE component
           
       
        This is the display name of my J2EE component
           
       
        TestServlet
           
       
        servlet.TestServlet
         
        
          
       
        HelloServlet
           
       
        /servlet/HelloServlet
         
        
          
       
        TestServlet
           
       
        /servlet/TestServlet
         
            
          
       
        index.jsp
         
      
     

index.jsp

1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7  8  9   10     11     12     13     
     14     
     15     
         16     
     17     
     18     
     21   22   23   24     
Servlet路径跳转
25     
     
26     
     27     
     28     使用相对路径访问HelloServlet!
29     
     30     使用绝对路径访问HelloServlet!
31     
     32     访问TestServlet，跳转到Test.jsp33   34 

test.jsp

1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%> 2 <% 3 String path = request.getContextPath(); 4 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7  8  9   10     11     12     13     
     14     
     15     
         16     
     17     
     18     
     21   22   23   24     
Test.jsp
25   26 

 

 

1 package com.po; 2  3 public class Users { 4  5     private String username; 6     private String password; 7     public Users() { 8          9     }10     public String getUsername() {11         return username;12     }13     public void setUsername(String username) {14         this.username = username;15     }16     public String getPassword() {17         return password;18     }19     public void setPassword(String password) {20         this.password = password;21     }    22 }

 

1 
      2 
     
       7   
       8   
      
        9     
       
        This is the description of my J2EE component
       10     
       
        This is the display name of my J2EE component
       11     
       
        LoginServlet
       12     
       
        servlet.LoginServlet
       13   
      14 15   
      
       16     
       
        LoginServlet
       17     
       
        /servlet/LoginServlet
       18   
          19   
      
       20     
       
        login.jsp
       21   
      22 
     

 

1 package servlet; 2  3 import java.io.IOException; 4 import java.io.PrintWriter; 5  6 import javax.servlet.ServletException; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse;10 11 import com.po.Users;12 13 public class LoginServlet extends HttpServlet {14 15     /**16      * Constructor of the object.17      */18     public LoginServlet() {19         super();20     }21 22     /**23      * Destruction of the servlet. 
24      */25     public void destroy() {26         super.destroy(); // Just puts "destroy" string in log27         // Put your code here28     }29 30     /**31      * The doGet method of the servlet. 
32      *33      * This method is called when a form has its tag value method equals to get.34      * 35      * @param request the request send by the client to the server36      * @param response the response send by the server to the client37      * @throws ServletException if an error occurred38      * @throws IOException if an error occurred39      */40     public void doGet(HttpServletRequest request, HttpServletResponse response)41             throws ServletException, IOException {42 43         doPost(request,response);44     }45 46     /**47      * The doPost method of the servlet. 
48      *49      * This method is called when a form has its tag value method equals to post.50      * 51      * @param request the request send by the client to the server52      * @param response the response send by the server to the client53      * @throws ServletException if an error occurred54      * @throws IOException if an error occurred55      */56     public void doPost(HttpServletRequest request, HttpServletResponse response)57             throws ServletException, IOException {58 59         Users u = new Users();60         String username=request.getParameter("username");61         String password=request.getParameter("password");62         u.setUsername(username);63         u.setPassword(password);64         //判断用户名和密码是否合法65         if(u.getUsername().equals("admin")&&u.getPassword().equals("admin"))66         {67             response.sendRedirect(request.getContextPath()+"/login_success.jsp");68         }69         else70         {71             response.sendRedirect(request.getContextPath()+"/login_failure.jsp");72         }73         74         request.getSession().setAttribute("loginUserid", u);//把注册成功的用户对象保存在session对象中75     }76 77     /**78      * Initialization of the servlet. 
79      *80      * @throws ServletException if an error occurs81      */82     public void init() throws ServletException {83         // Put your code here84     }85 86 }

login.jsp

1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%> 2 <% 3    String path = request.getContextPath(); 4    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7      8         
      9         10         
     11         
     12         
         13         
         14         15         16         17         
         18     19     20     
     
      21         
      
       22             
       23         
      
24         
      
       25             
       
        26             
        
27                 用户名: 28                  29                 密码: 30                     31             
32             
        
33                 34             
35             
       
36         
      
37     
     
38     39 

 

login_failure

1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%> 2 <% 3    String path = request.getContextPath(); 4    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7      8         
      9         10         
     11         
     12         
         13         
         14         15         16         17         
         18     19     20     
     
      21         
      
       22             
       23         
      
24         
      
       25              登录失败！请检查用户或者密码!
       
26           
       返回登录   27         
      
28     
     
29     30 

 

 login_success.jsp

1 <%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%> 2 <% 3    String path = request.getContextPath(); 4    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 5 %> 6  7      8         
      9         10         
     11         
     12         
         13         
         14         15         16         17         
         18     19     20      
     37  38     
     39     
     
      40         
      
       41             
       42             43         
      
44         
      
       45             欢迎您
        
          ，登录成功！47         
      
48     
     
49     50 51 52