SpringBoot 参数检查 Controller中检查参数是否合法

springboot 验证 默认使用的是hibernate validator ，不用额外增加引用包，springboot已经内置包含。

设置pom相关依赖

<?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.itstudy</groupId>
    <artifactId>demo</artifactId>
    <version>1.0.0-SNAPSHOT</version>

    <name>demo</name>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.30</version>
        </dependency>
    </dependencies>

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

1)定义接收参数实体

package com.study.valid_demo.vo;

import javax.validation.constraints.AssertFalse;
import javax.validation.constraints.Pattern;

import org.hibernate.validator.constraints.NotBlank;

/**
 * 接收客户端信息载体
 *
 * @author Administrator
 *
 */
public class RegisterVO {

    @NotBlank(message = "用户名不能为空")
    private String userName;

    @NotBlank(message = "年龄不能为空")
    @Pattern(regexp = "^[0-9]{1,2}$", message = "年龄不正确")
    private String age;

    @AssertFalse(message = "必须为false")
    private Boolean isFalse;
    /**
     * 如果是空，则不校验，如果不为空，则校验
     */
    @Pattern(regexp = "^[0-9]{4}-[0-9]{2}-[0-9]{2}$", message = "出生日期格式不正确")
    private String birthday;

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getAge() {
        return age;
    }

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

    public Boolean getIsFalse() {
        return isFalse;
    }

    public void setIsFalse(Boolean isFalse) {
        this.isFalse = isFalse;
    }

    public String getBirthday() {
        return birthday;
    }

    public void setBirthday(String birthday) {
        this.birthday = birthday;
    }
}

2.定义controller

package com.study.valid_demo;

import javax.validation.Valid;

import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.study.valid_demo.vo.RegisterVO;

@RestController
@RequestMapping("/index")
public class IndexController {

    @RequestMapping("/register")
    @ResponseBody
    public String register(@RequestBody @Valid RegisterVO register, BindingResult result) {

        // 使用BindingResult 时,验证错误需要自己处理。应用程序程序正常返回
        if (result.hasErrors()) {
            for (ObjectError error : result.getAllErrors()) {
                System.out.println(error.getDefaultMessage());
            }

        }

        return register.getUserName();
    }

    @RequestMapping("/register2")
    @ResponseBody
    public String register(@RequestBody @Valid RegisterVO register) {

        // 不使用ResultBind时,在spring验证绑定时报400 Badrequest错误,并提示错误详细信息
        return register.getUserName();
    }
}

3)项目启动

import org.springframework.boot.Banner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class App {

    public static void main(String[] args) {

        SpringApplication app = new SpringApplication(App.class);
        //关闭banner
        app.setBannerMode(Banner.Mode.OFF);
        app.run(args);
    }

}