声明式数据验证

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
    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_3_0.xsd">
  <display-name></display-name>    
  
   <servlet>
      <!--  配置前端过滤器 -->
      <servlet-name>springmvc</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
       
    <init-param>
           <param-name>contextConfigLocation</param-name>
           <param-value>classpath:springmvc-servlet.xml</param-value>
       </init-param>
       <!-- 表示容器再启动的时候立即记载Servlet -->
       <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
      <servlet-name>springmvc</servlet-name>
      <url-pattern>/</url-pattern>
  </servlet-mapping>
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-3.2.xsd 
        http://www.springframework.org/schema/aop 
        http://www.springframework.org/schema/aop/spring-aop-3.2.xsd 
        http://www.springframework.org/schema/tx 
        http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">


    <!-- 采用组件扫描的形式 -->
    <context:component-scan base-package="com.inspur.controller"></context:component-scan>
    <mvc:annotation-driven validator="validator"></mvc:annotation-driven>
    <!-- 配置validator -->
    <bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
        <property name="providerClass" value="org.hibernate.validator.HibernateValidator"></property>
    
        <property name="validationMessageSource" ref="messageSource"></property>
    </bean>
    <!-- 配置的messageSource -->
    <bean id="messageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource" >
        <property name="basenames" value="classpath:message"></property>
        <!-- 资源文件的编码格式 -->
        <property name="fileEncodings" value="utf-8"></property>
        <!-- 对资源文件内容缓存时间，单位秒 -->
        <property name="cacheSeconds" value="120"></property>
    </bean>
    
    <!-- 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="ViewClass" value="org.springframework.web.servlet.view.JstlView"></property>
        <!-- <property name="prefix" value="/WEB-INF/jsp/"></property>
        <property name="suffix" value=".jsp"></property> -->
    </bean>
</beans>

package com.inspur.controller;

import javax.validation.Valid;

import org.springframework.stereotype.Controller;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;

import com.inspur.pojo.User;
@Controller
public class ValidateController {
    @RequestMapping("/validate")
    public String annotationValidate(@Valid @ModelAttribute("user")User user,Errors errors){
        //是否存在错误
        if(errors.hasErrors()){
            return "/jsp/error.jsp";
        }
        return "/jsp/success.jsp";
    }

}

package com.inspur.pojo;

import javax.validation.constraints.NotNull;

public class User {
    @NotNull(message="{username.not.empty}")
    private String username;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

}