SpringBoot2 @validated 类型效验

详细参见：《Spring Boot 2精髓：从构建小系统到架构分布式大系统》 第三章 3.5节 验证框架

package com.archibladwitwicke.springboot2.chapter03.pojo;

import javax.validation.constraints.Max;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Null;

public class UserValidated {

    public interface Add {
    }

    public interface Update {
    }

    @NotNull(groups = Update.class)
    @Null(groups = Add.class)
    private Long id;

    @NotNull(message = "名字不能为空！")
    private String name;

    @NotNull(message = "年龄不能为空！")
    @Max(value = 100, message = "年龄不能大于100岁！")
    private String age;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public String getAge() {
        return age;
    }

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

　　

package com.archibladwitwicke.springboot2.chapter03.controller;

import com.archibladwitwicke.springboot2.chapter03.pojo.UserValidated;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;

@Controller
@RequestMapping("/validated")
public class ValidatedController {

    @RequestMapping("/validateuser")
    @ResponseBody
    public String validateUser(@Validated UserValidated userValidated, BindingResult bindingResult) {
        String result = null;

        if (bindingResult.getErrorCount() == 0) {
            result = "通过验证！";
        }

        List<ObjectError> allErrors = bindingResult.getAllErrors();
        for (ObjectError error : allErrors) {
            String defaultMessage = error.getDefaultMessage();
            System.out.println(defaultMessage);
        }

        return result;
    }

    @RequestMapping("/validateusergroup")
    @ResponseBody
    public String validateUserByGroup(@Validated({UserValidated.Add.class}) UserValidated userValidated, BindingResult bindingResult) {
        String result = null;

        if (bindingResult.getErrorCount() == 0) {
            result = "通过验证！";
        }

        List<ObjectError> allErrors = bindingResult.getAllErrors();
        for (ObjectError error : allErrors) {
            String defaultMessage = error.getDefaultMessage();
            System.out.println(defaultMessage);
        }

        return result;
    }
}