SSM-SpringMVC中利用hibernate-validator做后台校验

运行环境idea2018.2+maven3.5.4+jdk1.8+tomact8.5.34

一、第一步：引入包
在pom.xml中添加包，maven即可自动下载

<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.0.13.Final</version>
</dependency>

<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>2.0.1.Final</version>
</dependency>
有些验证还需要其他一些包，如正则表达式，slf4J等

<dependency>
<groupId>org.jboss.logging</groupId>
<artifactId>jboss-logging</artifactId>
<version>3.3.0.Final</version>
</dependency>

<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.2</version>
</dependency>


<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>

二、第二步配置Spring-mvc.xml
------里面需要新配置一个验证器，并且绑定注解驱动

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

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

<mvc:annotation-driven/>

<mvc:default-servlet-handler/>

<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/views/"/>
<property name="suffix" value=".jsp"/>
</bean>

<bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean">

<property name="providerClass" value="org.hibernate.validator.HibernateValidator"/>
</bean>
</beans>
三、修改web.xml中央调度器的上下文配置位置为上面那个配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">

<welcome-file-list>
<welcome-file>/WEB-INF/views/login.jsp</welcome-file>
</welcome-file-list>

<display-name>ChatRobot</display-name>
<description>ChatRobot_Alpha_0.0.1</description>

<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-*.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
<async-supported>true</async-supported>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>


<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

四、在实体类里面用注解做校验，有些用正则表达式

package com.ssm.model;

import org.hibernate.validator.constraints.Length;

import javax.validation.constraints.*;

public class User {
private Integer id;
@NotEmpty(message = "用户名不能为空")
@Size(min = 2,max = 20,message = "用户名的长度必须在{min}-{max}之间")
private String name;

@Max(value = 150,message = "最老150岁")
@Min(value = 0,message = "最小0岁")
private Integer age;

@NotEmpty(message = "手机号码不能为空")
@Pattern(regexp = "^1[3|5|7|8|9]\\d{9}$",message = "手机号码格式不正确")
private String phone;

@NotEmpty(message = "邮箱不能为空")
@Pattern(regexp = "^\\w+@\\w+\\.\\w+$",message = "邮箱格式不正确")
private String email;

private String sex;
@Length(min=6 ,max= 20 ,message = "密码长度不符合标准")
private String password;

set、get方法省略、、、
}
五、控制器类UserController.java
@Valid表明参数User是要校验的类，BindingResult是存储错误信息的类,两者必须一一对应,并且位置挨着,不能中间有其他参数,

@Controller
@RequestMapping("/user")
public class UserController {

@RequestMapping("/validatorZC")
public String validatorZC(@Valid User user, BindingResult br, Model model){
//判定br中错误数是否大于0，如果true，证明有一个验证失败了
if (br.getErrorCount()>0){
FieldError name=br.getFieldError("name");
FieldError password=br.getFieldError("password");

//哪个验证失败，就回显示哪个
if(name!=null){
String namemsg = name.getDefaultMessage();
model.addAttribute("namemsg",namemsg);
}
if(password!=null){
String psdmsg = password.getDefaultMessage();
model.addAttribute("psdmsg",psdmsg);
}

//这个if里面就是肯定有错误，回显示名字
model.addAttribute("name",user.getName());
/*返回注册页面*/
return "login";
}
/*注册成功*/
return "success";

}
六、注册页面register.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
<title>Title</title>
</head>
<body>

<h1>数据校验</h1>
<form action="${pageContext.request.contextPath}/user/validatorZC" method="post">
姓名:<input name="name" value="${name}"/><span>${namemsg }</span><br/><br/>
密码:<input name="password"/><span>${psdmsg }</span><br/><br/>
<input type="submit" value="注册"/>
</form>
</body>
</html>

七、注册成功以后转到scuuess.jsp页面

<%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %>
<html>
<body>
<h2>Success!</h2>
</body>
</html>

八、什么都不输入，提示效果图如下：

九、运行中遇到一个报错点：

代码失败，Validation.buildDefaultValidatorFactory()异常：
java.lang.NoSuchMethodError: javax.validation.BootstrapConfiguration.getClockProviderClassName()Ljava/lang/String;

解决办法如下：
把javaee的版本由7.0改为8.0

<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>8.0</version>
<scope>provided</scope>
</dependency>

十、BUG
发现个bug：项目中即使name和password都按规定格式输入了，依旧是不跳转到success.jsp页面。
解决办法1：把User类中除了name和password之外的其他成员变量先注释了，然后正常格式输入name和password以后就跳转到success页面
解决办法2：把除了name和password之外的成员变量上面的检验注释删掉，也可以跳转到success页面

我觉得应该是成员变量上面写了检验注释，即使注册时没有那个文本框，后台自动在检验，只是没有办法输出错误信息而已。所以有错误还是返回login页面。不跳转到success页面。

整体是在ssm框架基础上修改的，该项目的整体代码如下：
https://download.csdn.net/download/nba_linshuhao/10692145
---------------------
原文：https://blog.csdn.net/nba_linshuhao/article/details/82875502

SSM-SpringMVC中利用hibernate-validator做后台校验

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