SpringMVC实现jsr303校验

　　描述：光靠前端校验是不安全的，所以需要后端校验。Spring 3.0以后才支持jsr303校验，校验方式特别简单。

下面就给出部分代码实现：

1、需要导入的jar包：（注意：这里是利用maven进行依赖管理）

<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.4.1.Final</version>
        </dependency>

2、控制层：

　　 @RequestMapping(value="/emp",method=RequestMethod.POST)
    @ResponseBody
    public Message saveEmp(@Valid Employee employee,BindingResult result){
        if (result.hasErrors()) {//判断是否出错
            Map<String, Object> map=new HashMap<String, Object>();
            List<FieldError> fieldErrors = result.getFieldErrors();
            for (FieldError fieldError:fieldErrors) {
                map.put(fieldError.getField(), fieldError.getDefaultMessage());
            }
            return Message.fail().addData("filedErrors", map);
        }else {
            employeeService.saveEmp(employee);
            return Message.success();
        }
    }

3、bean：

package com.atguigu.crud.bean;

import javax.validation.constraints.Pattern;

public class Employee {
    private Integer empId;
    @Pattern(regexp="(^[a-zA-Z0-9_-]{6,16}$)|(^[\u2E80-\u9FFF]{2,5})",message="用户名必须是6-16位数字和字母的组合或者2-5位中文")
    private String empName;

    private String gender;
    @Pattern(regexp="^([a-z0-9_\.-]+)@([\da-z\.-]+)\.([a-z\.]{2,6})$" 
            ,  message="邮箱格式不正确")
    private String email;

    private Integer dId;
    
    //希望查询员工，同时带上部门信息
    private Department department;

    
    
    public Employee() {
        super();
    }

    public Employee(Integer empId, String empName, String gender, String email,
            Integer dId) {
        super();
        this.empId = empId;
        this.empName = empName;
        this.gender = gender;
        this.email = email;
        this.dId = dId;
    }

    public Department getDepartment() {
        return department;
    }

    public void setDepartment(Department department) {
        this.department = department;
    }

    public Integer getEmpId() {
        return empId;
    }

    public void setEmpId(Integer empId) {
        this.empId = empId;
    }

    public String getEmpName() {
        return empName;
    }

    public void setEmpName(String empName) {
        this.empName = empName == null ? null : empName.trim();
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender == null ? null : gender.trim();
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email == null ? null : email.trim();
    }

    public Integer getdId() {
        return dId;
    }

    public void setdId(Integer dId) {
        this.dId = dId;
    }
}