应用程序必须通过某种手段来确定客户端输入的数据是正确的。
springmvc里面讲过有两种方式:一种是使用spring自带的基于接口的验证器,第二种是使用jsr标准实现。
参考文章:https://blog.csdn.net/qq_40794973/article/details/97967016
参考文章:https://blog.csdn.net/a909301740/article/details/81671897
参考文章:http://www.360doc.com/content/18/0829/14/10072361_782131739.shtml
写入实体类的注解校验报红
参考文章:https://blog.csdn.net/qq_41902237/article/details/107511314
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-validation</artifactId>
</dependency>
package com.southwind.entity;
import lombok.Data;
import org.hibernate.validator.constraints.Length;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotEmpty;
import javax.validation.constraints.NotNull;
@Data
public class User {
@NotNull(message = "id不能为空")
private Long id;
@NotEmpty(message = "姓名不能为空")
@Length(min = 2,message = "姓名长度不能小于2位")
private String name;
@Min(value = 16,message = "年龄必须大于16岁")
private int age;
}
@GetMapping("/validator")
public void validatorUser(@Valid User user, BindingResult bindingResult){
System.out.println(user);
if(bindingResult.hasErrors()){
List<ObjectError> list = bindingResult.getAllErrors();
for(ObjectError objectError:list){
System.out.println(objectError.getCode()+"-"+objectError.getDefaultMessage());
}
}
}