Java Spring

@AssertFalse

• 适用类型：Boolean, boolean

• 用途：验证注解的元素值是false

@AssertTrue

• 适用类型：Boolean, boolean

• 用途：验证注解的元素值是true

@DecimalMax（value=x）

• 适用类型：BigDecimal, BigInteger, String, byte,short, int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of Number andCharSequence.

• 用途：验证注解的元素值小于等于@ DecimalMax指定的value值

@DecimalMin（value=x）

• 适用类型：BigDecimal, BigInteger, String, byte,short, int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of Number andCharSequence.

• 用途：验证注解的元素值小于等于@ DecimalMin指定的value值

@Digits(integer=整数位数, fraction=小数位数)

• 适用类型：BigDecimal, BigInteger, String, byte,short, int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of Number andCharSequence.

• 用途：验证注解的元素值的整数位数和小数位数上限

@Future

• 适用类型：java.util.Date, java.util.Calendar; Additionally supported by HV, if theJoda Time date/time API is on the class path: any implementations ofReadablePartial andReadableInstant.

• 用途：验证注解的元素值（日期类型）比当前时间晚

@Max（value=x）

• 适用类型：BigDecimal, BigInteger, byte, short,int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type ofCharSequence (the numeric value represented by the character sequence is evaluated), any sub-type of Number.

• 用途：验证注解的元素值小于等于@Max指定的value值

@Min（value=x）

• 适用类型：BigDecimal, BigInteger, byte, short,int, long and the respective wrappers of the primitive types. Additionally supported by HV: any sub-type of CharSequence (the numeric value represented by the char sequence is evaluated), any sub-type of Number.

• 用途：验证注解的元素值大于等于@Min指定的value值

@NotNull

• 适用类型：Any type

• 用途：验证注解的元素值不是null

@Null

• 适用类型：Any type

• 用途：验证注解的元素值是null

@Past

• 适用类型：java.util.Date, java.util.Calendar; Additionally supported by HV, if theJoda Time date/time API is on the class path: any implementations ofReadablePartial andReadableInstant.

• 用途：验证注解的元素值（日期类型）比当前时间早

@Pattern(regex=正则表达式, flag=)

• 适用类型：String. Additionally supported by HV: any sub-type of CharSequence.

• 用途：验证注解的元素值与指定的正则表达式匹配

@Size(min=最小值, max=最大值)

• 适用类型：String, Collection, Map and arrays. Additionally supported by HV: any sub-type of CharSequence.

• 用途：验证注解的元素值的在min和max（包含）指定区间之内，如字符长度、集合大小

@Valid

• 适用类型：Any non-primitive type（引用类型）

• 用途：验证关联的对象，如账户对象里有一个订单对象，指定验证订单对象

@NotEmpty

• 适用类型：CharSequence,Collection, Map and Arrays

• 用途：验证注解的元素值不为null且不为空（字符串长度不为0、集合大小不为0）

@Range(min=最小值, max=最大值)

• 适用类型：CharSequence, Collection, Map and Arrays,BigDecimal, BigInteger, CharSequence, byte, short, int, long and the respective wrappers of the primitive types

• 用途：验证注解的元素值在最小值和最大值之间

@NotBlank

• 适用类型：CharSequence

• 用途：验证注解的元素值不为空（不为null、去除首位空格后长度为0），不同于@NotEmpty，@NotBlank只应用于字符串且在比较时会去除字符串的空格

@Length(min=下限, max=上限)

• 适用类型：CharSequence

• 用途：验证注解的元素值长度在min和max区间内

@Email

• 适用类型：CharSequence

• 用途：验证注解的元素值是Email，也可以通过正则表达式和flag指定自定义的email格式

简单使用示例

标记校验注解

package com.example.demo.entity;

import javax.validation.constraints.Min;
import javax.validation.constraints.NotBlank;

public class Person {
    // 标记校验name不为空
    @NotBlank
    private String name;
    // 标记校验age大于等于18
    @Min(value = 18)
    private int age;

    private String sex;

    private float high;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public float getHigh() {
        return high;
    }

    public void setHigh(float high) {
        this.high = high;
    }

    @Override
    public String toString() {
        return "Person [name=" + name + ", age=" + age + ", sex=" + sex + ", high=" + high + "]";
    }

}

启用校验注解@Valid

package com.example.demo.controller;

import java.util.List;

import javax.validation.Valid;

import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.alibaba.fastjson.JSONObject;
import com.example.demo.entity.Person;

@Controller
public class DemoController {
    /**
     * 通过@Valid注解,标记启动校验。BindingResult对象获取校验结果
     * @param person 
     * @param result
     * @return
     */
    @RequestMapping("/test")
    @ResponseBody
    public String parseJsonToEntity(@RequestBody @Valid Person person, BindingResult result) {
        List<ObjectError> allErrors = result.getAllErrors();
        if (result.hasErrors()) {
            return JSONObject.toJSONString(allErrors);
        }
        return person.toString();
    }
}

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