SpringBoot使用validator校验 - HelloWorld开发者社区

在前台表单验证的时候，通常会校验一些数据的可行性，比如是否为空，长度，身份证，邮箱等等，那么这样是否是安全的呢，答案是否定的。因为也可以通过模拟前台请求等工具来直接提交到后台，比如postman这样的工具，那么遇到这样的问题怎么办呢，我们可以在后台也做相应的校验。

新建项目，因为本文会使用postman模拟前端请求，所以本文需要加入web依赖，pom文件如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.dalaoyang</groupId>
    <artifactId>springboot_validator</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>springboot_validator</name>
    <description>springboot_validator</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

创建一个demo类，说一下本文使用demo中校验使用的注解：
@NotEmpty：非空
@Length：长度，最长或者最短
@Email：校验email
@Pattern：使用正则校验，本文使用的是身份证的正则
，代码如下：

package com.dalaoyang.entity;

import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.Length;
import org.hibernate.validator.constraints.NotEmpty;

import javax.validation.constraints.Pattern;
import java.io.Serializable;

/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang.entity
 * @email yangyang@dalaoyang.cn
 * @date 2018/5/1
 */
public class Demo implements Serializable {

    @NotEmpty(message="用户名不能为空")
    @Length(min=6,max = 12,message="用户名长度必须位于6到12之间")
    private String userName;


    @NotEmpty(message="密码不能为空")
    @Length(min=6,message="密码长度不能小于6位")
    private String passWord;

    @Email(message="请输入正确的邮箱")
    private String email;

    @Pattern(regexp = "^(\\d{18,18}|\\d{15,15}|(\\d{17,17}[x|X]))$", message = "身份证格式错误")
    private String idCard;

    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 getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getIdCard() {
        return idCard;
    }

    public void setIdCard(String idCard) {
        this.idCard = idCard;
    }

}

创建一个TestDemoController，来测试本文的校验，代码如下：

package com.dalaoyang.controller;

import com.dalaoyang.entity.Demo;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.validation.Valid;
import java.util.List;

/**
 * @author dalaoyang
 * @Description
 * @project springboot_learn
 * @package com.dalaoyang.controller
 * @email yangyang@dalaoyang.cn
 * @date 2018/5/1
 */
@RestController
public class TestDemoController {

    @PostMapping("/")
    public String testDemo(@Valid Demo demo,BindingResult bindingResult){
        StringBuffer stringBuffer = new StringBuffer();
        if(bindingResult.hasErrors()){
            List<ObjectError> list =bindingResult.getAllErrors();
            for (ObjectError objectError:list) {
                stringBuffer.append(objectError.getDefaultMessage());
                stringBuffer.append("---");
            }
        }
        return stringBuffer!=null?stringBuffer.toString():"";
    }
}

启动项目使用postman分别做了三次请求，第一次所有属性都是随便填写的，如图

SpringBoot使用validator校验