利用javabean完成注册效果

register.java//用于生成javabean 

package info.haowei.javabean;
 2 
 3 import java.util.HashMap;
 4 import java.util.Map;
 5 
 6 public class Register {
 7 
 8     private String name;
 9     private String age;
10     private String email;
11     private Map<String,String>errors = null;
12     
13     
14     
15     public Register(){
16         this.name= "";
17         this.age="";
18         this.email="";
19         this.errors = new HashMap<String, String>();
20     }
21     public String getName() {
22         return name;
23     }
24     public void setName(String name) {
25         this.name = name;
26     }
27     public String getAge() {
28         return age;
29     }
30     public void setAge(String age) {
31         this.age = age;
32     }
33     public String getEmail() {
34         return email;
35     }
36     public void setEmail(String email) {
37         this.email = email;
38     }
39     
40     public boolean isValidate(){
41         boolean flag = true;
42         if(!this.name.matches("\\w{6,15}")){
43             flag = false;
44             this.name = "";
45             this.errors.put("errorname", "用户名是6-15位的数字");
46         }
47         if(!this.email.matches("\\w+@\\w+\\.\\w+\\.?\\w*")){
48             flag = false;
49             this.email = "";
50             this.errors.put("erroremail", "email地址不合法");
51         }
52         if(!this.age.matches("\\d+")){
53             flag = false;
54             this.age = "";
55             this.errors.put("errorage", "age输入不合法");
56         }
57         
58         return flag;
59     }
60     
61     public String getErrorMsg(String key){
62         String value = this.errors.get(key);
63         if(value==null){
64             return "";
65         }
66         return value;
67     }
68     
69     
70     
71 }

//check.jsp用于判断输入是否正确

<%@page contentType="text/html" pageEncoding="GBK"%>

<html>
  <head>
 
  </head>
   <% request.setCharacterEncoding("GBK"); //解决乱码问题 %>    
   
    <jsp:useBean id="reg" scope="request" class="info.haowei.javabean.Register"/>
   <jsp:setProperty property="*" name="reg"/>
   
  <body>
       <%
           if(reg.isValidate()){
           %>
           
        <jsp:forward page="success.jsp"></jsp:forward>
 
           <%
           }else{
        %>
        <jsp:forward page="index.jsp"></jsp:forward>
        <%} %>
  </body>
</html>

//index.jsp 利用表单输入并通过javabean传递信息

 1 <%@page contentType="text/html" pageEncoding="GBK"%>
 2 <html>
 3   <head>
 4   </head>
 5   <% request.setCharacterEncoding("GBK"); //解决乱码问题 %>    
 6   <jsp:useBean id="reg" scope="request" class="info.haowei.javabean.Register"/>
 7   
 8   <body> 
 9     <form action="check.jsp" method="post">
10     用户名:<input type="text" name="name" value="<jsp:getProperty name="reg" property="name"/>"/>
11     <%=reg.getErrorMsg("errorname") %><br>
12     年&nbsp;龄:<input type="text" name="age" value="<jsp:getProperty name="reg" property="age"/>"/>
13     <%=reg.getErrorMsg("errorage") %><br>
14   email: <input type="text" name="email" value="<jsp:getProperty name="reg" property="email"/>"/>
15     <%=reg.getErrorMsg("erroremail") %><br>
16     
17     <input type="submit" value = "submit">
18     <input type="reset" value = "reset">
19     </form>
20   </body>
21 </html>

// 注册成功界面

 1 <%@page contentType="text/html" pageEncoding="GBK"%>
 2 <html>
 3   <head>
 4   </head>
 5   <% request.setCharacterEncoding("GBK");  //解决乱码问题%>    
 6   <jsp:useBean id="reg" scope="request" class="info.haowei.javabean.Register"/>
 7   
 8   <body> 
 9     
10     用户名:<jsp:getProperty name="reg" property="name"/><br>
11  
12     年&nbsp;龄:<jsp:getProperty name="reg" property="age"/><br>
13 
14   email: <jsp:getProperty name="reg" property="email"/><br>
15 
16     
17     
18   </body>
19 </html>