SpringBoot参数校验@Validated和@Valid的使用

1、@Validated和@Valid区别

@Validated：可以用在类、方法和方法参数上。但是不能用在成员属性（字段）上
@Valid：可以用在方法、构造函数、方法参数和成员属性（字段）上

2、引入依赖

Spring Boot 2.3 1 之前，只需要引用spring-boot-starter-web

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

Spring Boot 2.3 1 之后，spring-boot-starter-validation 已经不包括在了 spring-boot-starter-web 中，需要我们手动加上。

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-validation</artifactId>
</dependency>

3、示例代码

测试实体类

package com.test.entity;

import javax.validation.constraints.NotBlank;

import lombok.Data;

/**
 * 测试实体类
 */
@Data
public class Test {
	/**
     * 账号
     */
    @NotBlank(message = "登陆账号不能为空")
    private String username;
    /**
     * 密码
     */
    @NotBlank(message = "密码不能为空")
    private String password;

}

Controller

package com.test.controller;

import javax.validation.Valid;
import javax.validation.constraints.NotNull;

import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import com.test.entity.Test;

/**  
 * 测试参数校验
 */
@RestController
@RequestMapping("/test")
@Validated
public class TestController {
	
	@RequestMapping(value = "getId", method = RequestMethod.GET)
    public String getId(@NotNull Integer id) {
		return "id: "+id;
	}
	
	@RequestMapping(value = "save", method = RequestMethod.POST)
    public String save(@Valid Test test) {
		System.out.println(test.getUsername());
		return "success";
	}
}

4、验证结果

getId方法

save方法

大家会看到现在的错误提示非常不友好，我们可以自定义异常返回错误消息

参考文章：SpringBoot注解校验validation自定义异常返回错误消息给前端_自定义校验注解前台如何弹窗提示-CSDN博客

@NotBlank注解String字段会报错_@notblank报错-CSDN博客

4、@Validated和@Valid使用情况测试

1.@Validated和@Valid同时使用--结果：验证成功

/**  
 * 1.@Validated和@Valid同时使用--结果：验证成功
 */
@RestController
@RequestMapping("/test")
@Validated
public class TestController {
	
	@RequestMapping(value = "getId", method = RequestMethod.GET)
    public String getId(@NotNull Integer id) {
		return "id: "+id;
	}
	
	@RequestMapping(value = "save", method = RequestMethod.POST)
    public String save(@Valid Test test) {
		System.out.println(test.getUsername());
		return "success";
	}
}

2.@Validated单独使用--结果：getId方法的参数id校验成功，save方法实体校验失效

/**  
 * 2.@Validated单独使用--结果：getId方法的参数id校验成功，save方法实体校验失效
 */
@RestController
@RequestMapping("/test")
@Validated
public class TestController {
	
	@RequestMapping(value = "getId", method = RequestMethod.GET)
    public String getId(@NotNull Integer id) {
		return "id: "+id;
	}
	
	@RequestMapping(value = "save", method = RequestMethod.POST)
    public String save(Test test) {
		System.out.println(test.getUsername());
		return "success";
	}
}

3.@Valid单独使用--结果：getId方法的参数id校验失效，save方法实体校验成功

/**  
 *  3.@Valid单独使用--结果：getId方法的参数id校验失效，save方法实体校验成功
 */
@RestController
@RequestMapping("/test")
public class TestController {
	
	@RequestMapping(value = "getId", method = RequestMethod.GET)
    public String getId(@NotNull Integer id) {
		return "id: "+id;
	}
	
	@RequestMapping(value = "save", method = RequestMethod.POST)
    public String save(@Valid Test test) {
		System.out.println(test.getUsername());
		return "success";
	}
}

4.参数id也加上@Valid--结果：getId方法的参数id校验失效，save方法实体校验成功

/**  
 *  4.参数id也加上@Valid--结果：getId方法的参数id校验失效，save方法实体校验成功
 */
@RestController
@RequestMapping("/test")
public class TestController {
	
	@RequestMapping(value = "getId", method = RequestMethod.GET)
	@Validated
    public String getId(@Valid @NotNull Integer id) {
		return "id: "+id;
	}
	
	@RequestMapping(value = "save", method = RequestMethod.POST)
    public String save(@Valid Test test) {
		System.out.println(test.getUsername());
		return "success";
	}
}