数据校验（后台校验 hibernate validate）
1、首先要导入jar包
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
