在进入Controller前完成参数的校验，针对对象参数
分为两个验证方式
（1）直接使用已定义的校验方式
1、在需要进行校验的属性上增加校验类型注解
import java.util.Date;
import javax.validation.constraints.Past;
import org.hibernate.validator.constraints.NotBlank;
public class User {
private String id;
private String username;
@NotBlank(message = "密码不能为空")
private String password;
@Past(message = "生日必须是过去的日期")
private Date birthday;
@JsonView(UserSimpleView.class)
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
}
2、在controller中增加注解
3、增加 BindingResult 获取错误信息
import java.util.ArrayList;
import java.util.List;
import javax.validation.Valid;
import org.apache.commons.lang.builder.ReflectionToStringBuilder;
import org.apache.commons.lang.builder.ToStringStyle;
import org.springframework.data.domain.Pageable;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.fasterxml.jackson.annotation.JsonView;
import com.maple.dto.User;
import com.maple.dto.UserQueryCondition;
import com.maple.dto.User.UserDetailView;
import com.maple.dto.User.UserSimpleView;
import com.maple.exception.UserNotExitException;
/**
*
* @author hzc
*
*/
@RestController
@RequestMapping("/user")
public class UserController {
@PostMapping
public User createUser(@Valid @RequestBody User user, BindingResult errors) {
if (errors.hasErrors()) { //判断是否有错误值
errors.getAllErrors().stream().forEach(error -> System.out.println(error.getDefaultMessage()));
}
System.out.println(user.getId());
System.out.println(user.getPassword());
System.out.println(user.getUsername());
System.out.println(user.getBirthday());
user.setId("1");
return user;
}
}
API中已有的校验方法
（2）自定义校验方法
1、建立自定义注解类，@Target ： 注解的范围，如方法，属性，类等 ； @Retention ： 注解的生命周期，值为 RetentionnPolicy枚举类
package com.maple.validator;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import javax.validation.Constraint;
import javax.validation.Payload;
@Target({ ElementType.METHOD, ElementType.FIELD })
@Retention(RetentionPolicy.RUNTIME)
@Constraint(validatedBy = MyConstraintValidator.class) // 绑定下面自定义的校验方法
public @interface MyConstraint {
// 需要定义以下三个属性
String message();
Class[] groups() default { };
Classextends Payload>[] payload() default { };
}
2、定义校验方法，可在方法中使用 @Autowired 实现类的注入，在isValid中实现参数的验证。
package com.maple.validator;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import org.springframework.beans.factory.annotation.Autowired;
public class MyConstraintValidator implements ConstraintValidator {
@Override
public void initialize(MyConstraint constraintAnnotation) {
System.out.println("my validator init");
}
@Override
public boolean isValid(Object value, ConstraintValidatorContext context) {
helloService.greeting("Tom");
System.out.println(value);
return false;
}
}
3、调用自定义的校验，在属性上增加自定义的注解 @MyConstraint
@MyConstraint(message = "这是一个测试")
private String username;
Original: https://www.cnblogs.com/maple92/p/10780243.html
Author: Topze
Title: Spring 进入Controller前参数校验
原创文章受到原创版权保护。转载请注明出处：https://www.johngo689.com/582944/
转载文章受原作者版权保护。转载请注明原作者出处！