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SpringMVC之编程式校验

1.编程式效验需要实现Validator接口，针对模型类进行校验
2.jar包

3.项目测试结构

4.StudentModel.java（模型类）

 1 package com.wt.entity;
 2 
 3 public class StudentModel {
 4     private String name;
 5     private String pwd;
 6     private int age;
 7     public String getName() {
 8         return name;
 9     }
10     public void setName(String name) {
11         this.name = name;
12     }
13     public String getPwd() {
14         return pwd;
15     }
16     public void setPwd(String pwd) {
17         this.pwd = pwd;
18     }
19     public int getAge() {
20         return age;
21     }
22     public void setAge(int age) {
23         this.age = age;
24     }
25     
26 }
View Code

5.StudentValidator.java（校验器）

 1 package com.wt.entity;
 2 
 3 import org.springframework.validation.Errors;
 4 import org.springframework.validation.ValidationUtils;
 5 import org.springframework.validation.Validator;
 6 
 7 public class StudentValidator implements Validator{
 8     //验证是否支持效验的StudentModel对象，匹配则执行效验
 9     @Override
10     public boolean supports(Class<?> clazz) {
11         
12         return StudentModel.class.equals(clazz);
13     }
14     //效验数据的方法，object为效验的对象，Errors为效验的错误信息
15     @Override
16     public void validate(Object obj, Errors errors) {
17         //效验name和pwd属性为空时加入错误信息
18         ValidationUtils.rejectIfEmpty(errors, "name", null,"姓名不能为空");
19         ValidationUtils.rejectIfEmpty(errors, "pwd", null,"密码不能为空");
20         if(errors.hasErrors()){
21             //上面发现错误,直接返回,下面也无需效验
22             return;
23         }
24         //针对属性的规则进行具体效验
25         StudentModel stu=(StudentModel) obj;
26         if(stu.getName().length()<5||stu.getName().length()>10){
27             errors.rejectValue("name", null, "姓名长度错误，应在5~10间");
28         }
29         if(stu.getPwd().length()<8||stu.getPwd().length()>15){
30             errors.rejectValue("pwd", null,"密码长度错误，应在8~15之间");
31         }
32         if(stu.getAge()<=0||stu.getAge()>100){
33             errors.rejectValue("age", null, "年龄错误，应在1~100之间");
34         }
35     }
36 
37 }
View Code

6.ValidController.java(控制器)

 1 package com.wt.entity;
 2 
 3 import org.springframework.stereotype.Controller;
 4 import org.springframework.validation.Errors;
 5 import org.springframework.web.bind.annotation.RequestMapping;
 6 
 7 @Controller//定义控制器
 8 public class ValidController {
 9     //声明效验器
10     StudentValidator studentValidator=new StudentValidator();
11     @RequestMapping(value="validstu.html")//访问路径
12     public String validStudent(StudentModel model,Errors errors){    
13         studentValidator.validate(model, errors);//效验对象
14         if(errors.hasErrors()){//发现错误，forword到错误页面
15             return "Error";
16         }
17         return "result";//成功
18         
19     }
20 }
View Code

7.springmvc-servlet.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <beans xmlns="http://www.springframework.org/schema/beans"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xmlns:mvc="http://www.springframework.org/schema/mvc"
 5     xmlns:p="http://www.springframework.org/schema/p"
 6     xmlns:context="http://www.springframework.org/schema/context"
 7     xsi:schemaLocation="
 8         http://www.springframework.org/schema/beans
 9         http://www.springframework.org/schema/beans/spring-beans.xsd
10         http://www.springframework.org/schema/context
11         http://www.springframework.org/schema/context/spring-context.xsd
12         http://www.springframework.org/schema/mvc
13         http://www.springframework.org/schema/mvc/spring-mvc.xsd">
14         <!-- 注解扫描 -->
15     <context:component-scan base-package="com.wt.entity"/>
16      
17     <!-- 完成视图的对应 -->
18     <!-- 对转向页面的路径解析。prefix：前缀， suffix：后缀 -->
19     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
20         <property name="prefix" value="/WEB-INF/jsp/example1/"/>
21         <property name="suffix" value=".jsp"/>
22     </bean>
23 
24 </beans>
View Code

8.web.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
 3   <display-name>SpringMVC</display-name>
 4   <servlet>
 5     <servlet-name>article6</servlet-name>
 6     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
 7     <init-param>
 8       <param-name>contextConfigLocation</param-name>
 9       <param-value>classpath:springmvc-servlet.xml</param-value>
10     </init-param>
11   </servlet>
12   <servlet-mapping>
13     <servlet-name>article6</servlet-name>
14     <url-pattern>/url/*</url-pattern>
15   </servlet-mapping>
16 </web-app>
View Code

9.Errors.jsp(头部导入form标签)

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3     <%@taglib prefix="sf" uri="http://www.springframework.org/tags/form" %>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body>
11 <sf:form commandName="studentModel">
12     显示所有错误消息
13     <br>
14     <sf:errors path="*"/>
15     <br>
16     <br>
17     显示属性为age的错误信息
18     <br>
19     <sf:errors path="age"></sf:errors>
20 </sf:form>
21 </body>
22 </html>
View Code

10.result.jsp

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 4 <html>
 5 <head>
 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 7 <title>Insert title here</title>
 8 </head>
 9 <body>
10 效验成功
11 </body>
12 </html>
View Code

11.测试结果

 

posted @ 2018-04-14 10:34  小王六点要起床  阅读(401)  评论(0)  编辑  收藏  举报