SpringCloud参数校验

@GetMapping("/update")
@ResponseBody
public void update(
        @Size(min = 1,max = 10,message = "姓名长度必须为1到10") @RequestParam("name") String name,
        @Min(value = 10,message = "年龄最小为10") @Max(value = 100,message = "年龄最大为100")
@RequestParam("age") Integer age) {
    ...
}

import lombok.Data;

@Data
public class UserDto {
    @Size(min = 1, max = 10, message = "姓名长度必须为1到10")
    private String name;

    @Min(value = 10, message = "年龄最小为10")
    @Max(value = 100, message = "年龄最大为100")
    private Integer age;
}

@PostMapping("/update")
@ResponseBody
public void update(@Valid @RequestBody UserDto user) {
}

@GetMapping("/exam-info")
public Boolean getInfo(@Valid User user){.....}

@GetMapping("/exam-info")
public Boolean getInfo(@Validated User user){.....}

public class User {
  @Valid
  @NotNull("car不能为空")
  private Car car;
}

public class Car {
  @NotNull("id不能为空")
  private Integer id;
}

// 装饰器
import javax.validation.Constraint;
import javax.validation.Payload;
import java.lang.annotation.*;

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.PARAMETER,ElementType.FIELD})
@Constraint(validatedBy = FlagValidatorClass.class)
public @interface FlagValidator {
    // flag的有效值，多个使用,隔开
    String values();

    // flag无效时的提示内容
    String message() default "flag必须是预定义的那几个值，不能随便写";

    Class<?>[] groups() default {};

    Class<? extends Payload>[] payload() default {};
}

// 校验规则
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class FlagValidatorClass implements ConstraintValidator<FlagValidator,Object> {
    /**
     * FlagValidator注解规定的那些有效值
     */
    private String values;

    @Override
    public void initialize(FlagValidator flagValidator) {
        this.values = flagValidator.values();
    }

    /**
     * 用户输入的值，必须是FlagValidator注解规定的那些值其中之一。
     * 否则，校验不通过。
     * @param value 用户输入的值，如从前端传入的某个值
     */
    @Override
    public boolean isValid(Object value, ConstraintValidatorContext constraintValidatorContext) {
        // 切割获取值
        String[] value_array = values.split(",");
        Boolean isFlag = false;

        for (int i = 0; i < value_array.length; i++){
            // 存在一致就跳出循环
            if (value_array[i] .equals(value)){
                isFlag = true; break;
            }
        }

        return isFlag;
    }
}

public class UserDto {
    // 前端传入的flag值必须是1或2或3，否则校验失败
    @FlagValidator(values = "1,2,3")
    private String flag;
}

import org.hibernate.validator.constraints.Length;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;

public class Resume {
    public interface Default {
    }

    public interface Update {
    }

    @NotNull(message = "id不能为空", groups = Update.class)
    private Long id;

    @NotNull(message = "名字不能为空", groups = Default.class)
    @Length(min = 4, max = 10, message = "name 长度必须在 {min} - {max} 之间", groups = Default.class)
    private String name;

    @NotNull(message = "年龄不能为空", groups = Default.class)
    @Min(value = 18, message = "年龄不能小于18岁", groups = Default.class)
    private Integer age;
}

/**
 * 使用Defaul分组进行验证
 * @param resume
 * @return
 */
@PostMapping("/validate5")
public String addUser(@Validated(value = Resume.Default.class) @RequestBody Resume resume) {
}

/**
 * 使用Default、Update分组进行验证
 * @param resume
 * @return
 */
@PutMapping("/validate6")
public String updateUser(@Validated(value = {Resume.Update.class, Resume.Default.class}) @RequestBody Resume resume) {}