Springboot结合@validated优化代码验证-Java开发

这篇文章主要介绍了Springboot与@validated注解结合从而实现让你的代码验证更清爽，文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值，需要的朋友们下面随着小编来一起学习学习吧

创建项目

创建spring-boot项目，这里我网络不好，就创建普通maven项目，通过依赖手动完成spring-boot项目创建。

添加注解

<parent>
        <artifactId>spring-boot-starter-parent</artifactId>
        <groupId>org.springframework.boot</groupId>
        <version>2.7.2</version>
</parent>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>2.7.2</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.24</version>
        </dependency>
		<!-- 数据验证的依赖 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-validation</artifactId>
        </dependency>
    </dependencies>

常用注解说明

@AssertFalse 校验false
@AssertTrue 校验true
@DecimalMax(value=,inclusive=) 小于等于value，inclusive=true,是小于等于
@DecimalMin(value=,inclusive=) 与上类似
@Max(value=) 小于等于value
@Min(value=) 大于等于value
@NotNull 检查Null
@Past 检查日期
@Pattern(regex=,flag=) 正则
@Size(min=, max=) 字符串，集合，map限制大小
@Validate 对po实体类进行校验

创建实体类

package com.hopeful.pojo;
import lombok.Data;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
import java.io.Serializable;
@Data
public class User implements Serializable {
    private Integer id;
    @NotNull(message = "姓名不能为空")
    private String name;
    @NotNull
    @Size(min = 6,message = "密码不能没空，且不能少于6位")
    private String pwd;
}

创建controller

package com.hopeful;
import com.hopeful.pojo.User;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;
@RequestMapping("/user")
@RestController
public class controller {
    @RequestMapping("/hello")
    public String hello() {
        return "hello";
    }
    @PostMapping("/insertUser")
    public String insert2(@Validated @RequestBody User user) {
        System.out.println(user);
        return "新增成功";
    }
}

数据验证失败，会报错，需要处理

数据验证失败处理

方法一：controller处理

package com.hopeful;
import com.hopeful.pojo.User;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RequestMapping("/user")
@RestController
public class controller {
    @RequestMapping("/hello")
    public String hello() {
        return "hello";
    }
    @GetMapping("/insertUser")
    public User insert(@Validated User user) {
        return user;
    }
    @PostMapping("/insertUser")
    public String insert2(@Validated @RequestBody User user, BindingResult bindingResult) {
        if(bindingResult.hasErrors()) {
            String msg = "";
            msg = getString(bindingResult, msg);
            return msg;
        }
        System.out.println(user);
        return "新增成功";
    }
    public static String getString(BindingResult bindingResult, String msg) {
        List<FieldError> fieldErrors = bindingResult.getFieldErrors();
        int size = fieldErrors.size();
        for (int i = 0; i < size; i++) {
            FieldError fieldError = fieldErrors.get(i);
            if(fieldError != null) {
                msg += fieldError.getDefaultMessage();
            }
            if(i < size - 1) {
                msg += ";";
            }
        }
        return msg;
    }
}

方法二：全局异常处理

我们建议使用全局异常处理。

创建全局异常处理

package com.hopeful.pojo.common;
import org.springframework.validation.BindException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import javax.validation.ConstraintViolationException;
import javax.validation.ValidationException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@ControllerAdvice
@ResponseBody
public class globalException extends RuntimeException {
    @ExceptionHandler(value = {BindException.class, ValidationException.class,MethodArgumentNotValidException.class})
    public String MethodArgumentNotValidException(Exception e) {
        String msg = "";
        if (e instanceof MethodArgumentNotValidException) {
            BindingResult bindingResult = ((MethodArgumentNotValidException) e).getBindingResult();
            // getFieldError获取的是第一个不合法的参数(P.S.如果有多个参数不合法的话)
            //FieldError fieldError = bindingResult.getFieldError();
            //if (fieldError != null) {
            //    msg = fieldError.getDefaultMessage();
            /

Springboot结合@validated优化代码验证

目录

创建项目

添加注解

数据验证失败处理

基础教程推荐