数据校验（后台校验 hibernate validate）
1、首先要导入jar包
<dependency> <groupId>javax.validation</groupId> <artifactId>validation-api</artifactId> <version>1.1.0.Final</version> </dependency> <!-- https://mvnrepository.com/artifact/com.fasterxml/classmate --> <dependency> <groupId>com.fasterxml</groupId> <artifactId>classmate</artifactId> <version>1.0.0</version> </dependency> <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator --> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator</artifactId> <version>5.1.3.Final</version> </dependency> <!-- https://mvnrepository.com/artifact/org.jboss.logging/jboss-logging --> <dependency> <groupId>org.jboss.logging</groupId> <artifactId>jboss-logging</artifactId> <version>3.1.3.GA</version> </dependency>
2、在相应的实体类中加入注解
package com.zhiyou100.zjc.bean; import javax.validation.constraints.Pattern; import org.hibernate.validator.constraints.Length; import org.hibernate.validator.constraints.NotEmpty; public class User { @NotEmpty(message = "用户名不为空") private String username; @Length(min = 6,max = 18,message = "密码长度在6~18之间") private String password; @Pattern(regexp = "/^1([38][0-9]|4[579]|5[0-3,5-9]|6[6]|7[0135678]|9[89])\d{8}$/",message = "手机号格式不正确") private String phone; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } }
下图为各个注解的意思：
3、在控制层接受参数时
package com.zhiyou100.zjc.controller; import java.util.HashMap; import java.util.List; import java.util.Map; import javax.validation.Valid; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.validation.BindingResult; import org.springframework.validation.FieldError; import org.springframework.web.bind.annotation.RequestMapping; import com.zhiyou100.zjc.bean.User; @Controller public class UserController { @RequestMapping("login")//如果没有登录，那么访问该请求地址是被打倒登录界面 //@Valid:校验该参数对象 //BindingResult:封装所有的验证错误信息 public String login(@Valid User user,BindingResult br,Model model) { if(br.hasErrors()) {//判断有没有错误信息 List<FieldError> fieldErrors = br.getFieldErrors();//等到所有的错误信息 Map<String, Object> errormsg = new HashMap<String, Object>(); for(FieldError errors:fieldErrors) { //getField()得到错误的字段 getDefaultMessage()得到错误的提示信息 errormsg.put(errors.getField(), errors.getDefaultMessage()); System.out.println(errors.getField()+"----"+errors.getDefaultMessage()); } model.addAttribute("msg", errormsg); return "forward:index.jsp"; } return "list"; } }
前端代码
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <form action="login" method="post"> 用户名:<input type="text" name="username"/>${msg.username }<br> 密码:<input type="text" name="password">${msg.password }<br> 电话:<input type="text" name="phone">${msg.phone }<br> <input type="submit" value="登录"> </form> </body> </html>
点击登录时，测试效果
