SSM-SpringMVC-31：SpringMVC中利用hibernate-validator做后台校验
------------吾亦无他,唯手熟尔，谦卑若愚，好学若饥-------------
校验有三种：前台页面校验（例如js和h5），后台校验，数据库校验
但是一般能不用数据库校验就不用数据库校验，因为性能损耗严重，
所以，我们用前台和后台俩种，可以说最好，绝大部分情况下，前台后台都要写，如果一个用户比较搞事，直接把它浏览器上的js给禁用掉了，那么如果没有后台校验，他将直接杀向数据库
很多人一提hibernate就说，哦，是一个框架，ORM框架，数据库访问层的框架，SSH的那个H！！！！
这个答案其实很一般，HibernateORM是Hibernate框架其中的一个重要的组成部分之一，像其它的例如hibernate-validator这个校验框架其实很不错
好了，不扯皮了，说说怎么用。。。。。。。
案例：
一，引入jar包
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.3.1.Final</version>
</dependency>
<!--validation api-->
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
</dependency>
也不知道大家看到了没有，由于是maven项目，只需要俩个节点就好，它会自动引入相关联的jar，如果不是maven，或者maven不好用，则还需要再引俩个jar，我把全部jar包的节点放上来
<!--数据验证-->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>4.0.1.GA</version>
</dependency>
<!--jboss logging-->
<dependency>
<groupId>org.jboss.logging</groupId>
<artifactId>jboss-logging</artifactId>
<version>3.3.0.Final</version>
</dependency>
<!--validation api-->
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.0.0.GA</version>
</dependency>
<!--slf4j api-->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.21</version>
</dependency>
二，自己的大配置文件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:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!--包扫描器--> <context:component-scan base-package="cn.dawn.day23validator"></context:component-scan> <!--视图解析器--> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/day23/"></property> <property name="suffix" value=".jsp"></property> </bean> <!--验证器--> <bean id="myvalidator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"> <!--注入hibernate的验证器--> <property name="providerClass" value="org.hibernate.validator.HibernateValidator"></property> </bean> <!--绑定注解驱动--> <mvc:annotation-driven validator="myvalidator"></mvc:annotation-driven> </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
四，建一个实体类：里面用注解做校验，很好理解，有些用正则
package cn.dawn.day23validator; import org.hibernate.validator.constraints.NotEmpty; import org.springframework.format.annotation.DateTimeFormat; import javax.validation.constraints.Max; import javax.validation.constraints.Min; import javax.validation.constraints.Pattern; import javax.validation.constraints.Size; import java.util.Date; /** * Created by Dawn on 2018/3/31. */ public class UserInfo { @NotEmpty(message = "用户名不能为空") @Size(min = 6,max = 20,message = "用户名的长度必须在{min}-{max}之间") private String username; @Max(value = 150,message = "最老150岁") @Min(value = 0,message = "最小0岁") private Integer userage; @NotEmpty(message = "手机号码不能为空") @Pattern(regexp = "^1[3|5|7|8|9]\\d{9}$",message = "手机号码格式不正确") private String userphone; @NotEmpty(message = "邮箱不能为空") @Pattern(regexp = "^\\w+@\\w+\\.\\w+$",message = "邮箱格式不正确") private String email; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public Integer getUserage() { return userage; } public void setUserage(Integer userage) { this.userage = userage; } public String getUserphone() { return userphone; } public void setUserphone(String userphone) { this.userphone = userphone; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } }
五，自定义的处理器和处理方法
package cn.dawn.day23validator; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.validation.BindingResult; import org.springframework.validation.FieldError; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; import javax.validation.Valid; /** * Created by Dawn on 2018/3/31. */ @Controller public class ValidatorController { @RequestMapping("/validatorZC") public String validatorZC(@Valid UserInfo userInfo, 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 userage=br.getFieldError("userage"); FieldError username=br.getFieldError("username"); FieldError userphone=br.getFieldError("userphone"); FieldError email=br.getFieldError("email"); //哪个验证失败，就回显示哪个 if(userage!=null){ String useragemsg = userage.getDefaultMessage(); model.addAttribute("useragemsg",useragemsg); } if(username!=null){ String usernamemsg = username.getDefaultMessage(); model.addAttribute("usernamemsg",usernamemsg); } if(userphone!=null){ String userphonemsg = userphone.getDefaultMessage(); model.addAttribute("userphonemsg",userphonemsg); } if(email!=null){ String emailmsg = email.getDefaultMessage(); model.addAttribute("emailmsg",emailmsg); } //这个if里面就是肯定有错误，回显示名字 model.addAttribute("username",userInfo.getUsername()); /*返回注册页面*/ return "validator"; } /*注册成功*/ return "success"; } }
六，jsp页面
6.1validator.jsp页面
<%-- Created by IntelliJ IDEA. User: Dawn Date: 2018/3/31 Time: 17:21 To change this template use File | Settings | File Templates. --%> <%@ 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="${pageContext.request.contextPath}/validatorZC" method="post"> 年龄:<input name="userage" /> <span>${useragemsg }</span><br/><br/> 姓名:<input name="username" value="${username}"/><span>${usernamemsg }</span><br/><br/> 电话:<input name="userphone"/><span>${userphonemsg }</span><br/><br/> 邮箱:<input name="email"/> <span>${emailmsg}</span><br/><br/> <input type="submit" value="注册"/> </form> </body> </html>
6.2success.jsp页面
<%@ page language="java" pageEncoding="utf-8" isELIgnored="false" %> <html> <body> <%--<img src="image/1.jpg">--%> <h2>Success!</h2> </body> </html>
七，启动tomcat，访问validator.jsp页面
有什么不懂的，联系我，原作者：晨曦Dawn
转载请注明出处 http://www.cnblogs.com/DawnCHENXI/p/8684167.html
