JSR-303校验的基本用法可以参考这篇文章:

     http://www.cnblogs.com/yangzhilong/p/3724967.html

 

这里讲一下自定义校验注解的用法;

1.定义一个注解

@Target({ElementType.FIELD, ElementType.METHOD})@Retention(RetentionPolicy.RUNTIME)@Constraint(validatedBy = ValidNumChecker.class)@Documentedpublic @interface ValidNum {    String message() default "the num is invalid";    Class
    [] groups() default {};    Class
    [] payload() default {};}

说明:重点在于 :

@Constraint(validatedBy = ValidNumChecker.class)

ValidNumChecker这个类是实际校验的方法;

2.编写实际校验的类

package com.river.jsr.annotation;import javax.validation.ConstraintValidator;import javax.validation.ConstraintValidatorContext;/** * Created by Administrator on 2017/10/19. */public class ValidNumChecker implements ConstraintValidator
    
      {    private ValidNum validNum;    @Override    public void initialize(ValidNum validNum) {        this.validNum = validNum;    }    @Override    public boolean isValid(Integer value, ConstraintValidatorContext constraintValidatorContext) {        if (value < 0 || value > 100) {            return false;        }        constraintValidatorContext.disableDefaultConstraintViolation();        constraintValidatorContext.buildConstraintViolationWithTemplate(this.validNum.message()).addConstraintViolation();        return true;    }}
    

说明:

这个类ValidNumChecker要实现接口

public interface ConstraintValidator {  //A为自定义注解ValidNum,T为校验数据的类型;    void initialize(A var1);   //初始化方法,    boolean isValid(T var1, ConstraintValidatorContext var2); //验证的逻辑,返回false则验证不通过}

 

3.实体类中应用

package com.river.jsr.entity;import com.river.jsr.annotation.ValidNum;import lombok.Getter;import lombok.NoArgsConstructor;import lombok.Setter;/** * Created by Administrator on 2017/10/18. */@NoArgsConstructorpublic class Person {    @Getter    @Setter    @ValidNum(message = "id 超出范围")    //在这里实践    private Integer id;    @Getter    @Setter    private Integer age;    @Getter    @Setter    private Integer hight;    @Getter    @Setter    private Integer weight;    }

4.Controller接收参数并验证;

package com.river.jsr.controller;import com.alibaba.fastjson.JSON;import com.river.jsr.entity.Person;import org.springframework.validation.BindingResult;import org.springframework.validation.ObjectError;import org.springframework.web.bind.annotation.*;import javax.validation.Valid;import java.util.Iterator;import java.util.List;/** * Created by Administrator on 2017/10/18. */@RestControllerpublic class PersonController {    @RequestMapping(value = "jsr", method = RequestMethod.POST)    @ResponseBody    public String jsrValid(@Valid Person person, BindingResult result) {                List
    
      allErrors = result.getAllErrors();        if (allErrors != null && !allErrors.isEmpty()) {            Iterator
     
       errorIterator = allErrors.iterator();            while (errorIterator.hasNext()) {                ObjectError error = errorIterator.next();                return error.getDefaultMessage();            }        }        return person.toString();    }}
     
    

说明:BindingResult result为接收错误信息的对象,若没有,则校验不通过直接抛出异常,通过这个对象可以拿到异常信息;

5.页面部分

    
         id" 
         age  
         hight 
         weight  
         
     
    

6.验证:

当输入参数均为10时,页面返回Person{id=10, age=1, hight=1, weight=1}

当id输入值为1000时,校验不通过,页面得到:id 超出范围

说明:提示信息"id 超出范围"可以在Person的字段加上自定义注解后自定义message属性,也可以使用默认模板在

org\hibernate\hibernate-validator\5.3.5.Final\hibernate-validator-5.3.5.Final.jar!\org\hibernate\validator\ValidationMessages_zh_CN.properties该路径下;

也可以将此文件copy到resource目录下自定义模板;

7.自定义模板

   修改自定义注解的message的default,

当default为字符串是被认为是默认提示消息;

当为{"key"}时,被认为引入了模板,在模板中

key             = \u9700\u8981\u662F\u4E00\u4E2A\u5408\u6CD5\u7684URL

通过key找到模板中的消息;

8.Validator直接注入

controller里面的校验这样写其实很麻烦,要是有很多很不方便;

我们可以改用这样的方式:

package com.river.jsr.controller;import com.river.jsr.entity.Person;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.validation.BindingResult;import org.springframework.validation.ObjectError;import org.springframework.web.bind.annotation.*;import javax.validation.ConstraintViolation;import javax.validation.Valid;import javax.validation.Validator;import java.util.Iterator;import java.util.List;import java.util.Set;/** * Created by Administrator on 2017/10/18. */@RestControllerpublic class PersonController {    @Autowired    private Validator validator;    @RequestMapping(value = "jsr", method = RequestMethod.POST)    @ResponseBody    public String jsrValid(Person person) {        Set
    
     
      > validate = validator.validate(person);        if (validate !=null &&! validate.isEmpty()){            Iterator
      
       
        > iterator = validate.iterator();            return iterator.next().getMessage();        }        return person.toString();    }}
       
      
     
    

结果不发生变化;

其中调用校验的方法

Set
    
     
      > validate = validator.validate(person);        if (validate !=null &&! validate.isEmpty()){            Iterator
      
       
        > iterator = validate.iterator();            return iterator.next().getMessage();        }
       
      
     
    

我们可以提出来单独一个方法,每次进入后首先调用校验方法;

9.AOP

这里应该很多人都想到了,进一步的我们可以写成一个aop,前置通知去做这一步的校验,切点打在要加入校验的方法上或者所有有该对象接收的方法上;

 

好了,就讲到这里吧,有些细节可以参考下面的链接;

这篇文章:http://clongjava.iteye.com/blog/1317649