springMVC 验证器

采用Hibernate-validator来进行验证，Hibernate-validator实现了JSR-303验证框架支持注解风格的验证。首先我们要到http://hibernate.org/validator/下载需要的jar包，这里以4.3.1.Final作为演示，解压后把hibernate-validator-4.3.1.Final.jar、jboss-logging-3.1.0.jar、validation-api-1.0.0.GA.jar这三个包添加到项目中。

/wzz/src/main/resources/applicationContext-mvc.xml

<?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:util="http://www.springframework.org/schema/util"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
	xmlns:p="http://www.springframework.org/schema/p" xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
						http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
						http://www.springframework.org/schema/tx
						http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
						http://www.springframework.org/schema/aop
					    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
						http://www.springframework.org/schema/context
    					http://www.springframework.org/schema/context/spring-context-3.0.xsd
						http://www.springframework.org/schema/mvc
    					http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">

    <!-- 添加注解驱动 -->
	<mvc:annotation-driven />

	<context:component-scan base-package="com.controller" />

	<!-- 对某些静态资源，如css,js,图片等进行过滤 ,有引用 "/resources/**" 的路径引用转到工程的/resources/目录取资源 -->
	<mvc:resources mapping="/resources/**" location="/resources/" />

	<!-- jsp 视图解析器 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/views/" />
		<property name="suffix" value=".jsp" />
	</bean>

	<!-- 默认的注解映射的支持 -->
    <mvc:annotation-driven validator="validator" conversion-service="conversion-service" />

    <bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">
        <property name="providerClass"  value="org.hibernate.validator.HibernateValidator"/>
        <!--不设置则默认为classpath下的 ValidationMessages.properties -->
        <property name="validationMessageSource" ref="validatemessageSource"/>
    </bean>
    <bean id="conversion-service" class="org.springframework.format.support.FormattingConversionServiceFactoryBean" />
    <bean id="validatemessageSource" class="org.springframework.context.support.ReloadableResourceBundleMessageSource">
        <property name="basename" value="classpath:validatemessages"/>
        <property name="fileEncodings" value="utf-8"/>
        <property name="cacheSeconds" value="120"/>
    </bean>
</beans>

　　/wzz/src/main/java/com/controller/GeneralController.java

package com.controller;

import javax.validation.Valid;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import com.java.LoginMessage;

@Controller
public class GeneralController {

	@RequestMapping(value="/login_input", method = {RequestMethod.GET})
	public String login_input(Model model){

		if(!model.containsAttribute("loginMessage")){
			model.addAttribute("loginMessage", new LoginMessage());
		}
		return "login";
	}

	@RequestMapping(value="/login_input", method = {RequestMethod.POST})
	public String login_save(@Valid @ModelAttribute("loginMessage") LoginMessage loginMessage, BindingResult bindingresult, Model model){
		if(bindingresult.hasErrors()){
			return login_input(model);
		}
		return "success";
	}
}

/wzz/src/main/java/com/java/LoginMessage.java

package com.java;

import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;

import org.hibernate.validator.constraints.NotEmpty;

public class LoginMessage { 

	@Pattern(regexp="^[a-zA-z0-9]+$", message="not has space.")
	private String fullname;

	@Size(min=3, max=20, message="The password must be at least 6 charaters long.")
	private String password;

	public String getFullname() {
		return fullname;
	}
	public void setFullname(String fullname) {
		this.fullname = fullname;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}

}

　　

/wzz/src/main/webapp/WEB-INF/views/login.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form:form modelAttribute="loginMessage" method="post">
       <!--  path="*"  错误提示一起出现 -->
       <%--  <form:errors path="*"></form:errors><br/><br/> --%>

        fullname：<form:input path="fullname" /><br/>
        <form:errors path="fullname"></form:errors><br/>

        password：<form:input path="password" /><br/>
        <form:errors path="password"></form:errors><br/>

        <input type="submit" value="Submit" />

    </form:form>
</body>
</html>