Spring Boot数据校验

数据校验是一个相当重要的环节，使用Spring Boot 进行数据校验。

添加校验依赖

全部依赖文件如下

    4.0.0
    
        org.springframework.boot
        spring-boot-starter-parent
        2.3.1.RELEASE
         
    
    com.example
    demo
    0.0.1-SNAPSHOT
    demo
    Demo project for Spring Boot

    
        1.8
    

    
        
            org.springframework.boot
            spring-boot-starter-validation
        
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
            
                
                    org.junit.vintage
                    junit-vintage-engine
                
            
        
    

    
        
            
                org.springframework.boot
                spring-boot-maven-plugin
            
        
    

添加配置文件

user:
  name:
    size: 用户名长度不符合要求
  age:
    size: 年龄输入不正确

添加数据校验

package com.example.demo;

import javax.validation.constraints.DecimalMax;
import javax.validation.constraints.DecimalMin;
import javax.validation.constraints.Size;

public class User {
    private Integer id;
    // 其长度
    @Size(min = 5, max = 10, message = "{user.name.size}")
    private String name;
    // 其上限和下限
    @DecimalMax(value = "200", message = "{user.age.size}")
    @DecimalMin(value = "5", message = "{user.age.size}")
    private Integer age;
    // 省去get和set
}

编写控制器

package com.example.demo;

import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;

@RestController
public class UserController {
    @PostMapping("/user")
    public List addUser(@Validated User user, BindingResult bindingResult){
        List errors = new ArrayList<>();
        // 非空
        if(bindingResult.hasErrors()){
            // 查找出Error 进行添加到结果集
            List allErrors = bindingResult.getAllErrors();
            for (ObjectError allError : allErrors) {
                errors.add(allError.getDefaultMessage());
            }
        }
        return errors;
    }
}

其中BindingResult 类是用于保存错误信息的

测试

分组校验

添加分组接口

在实体类中添加分组信息

package com.example.demo;

import javax.validation.constraints.DecimalMax;
import javax.validation.constraints.DecimalMin;
import javax.validation.constraints.Size;

public class User {
    private Integer id;
    // 其长度
    @Size(min = 5, max = 10, message = "用户名长度不符合要求", groups = ValidationGroup1.class)
    private String name;
    // 其上限和下限
    @DecimalMax(value = "200", message = "年龄输入不正确", groups = ValidationGroup2.class)
    @DecimalMin(value = "5", message = "年龄输入不正确", groups = ValidationGroup2.class)
    private Integer age;

    public Integer getId() {
        return id;
    }

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

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

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

控制器使用其分组

package com.example.demo;

import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.ArrayList;
import java.util.List;

@RestController
public class UserController {
    @PostMapping("/user")
    public List addUser(@Validated(ValidationGroup2.class) User user, BindingResult bindingResult){
        List errors = new ArrayList<>();
        // 非空
        if(bindingResult.hasErrors()){
            // 查找出Error 进行添加到结果集
            List allErrors = bindingResult.getAllErrors();
            for (ObjectError allError : allErrors) {
                errors.add(allError.getDefaultMessage());
            }
        }
        return errors;
    }
}

测试结果

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