SpringBoot非官方教程 | 第十九篇： 验证表单信息

这篇文篇主要简述如何在springboot中验证表单信息。在springmvc工程中，需要检查表单信息，表单信息验证主要通过注解的形式。

创建一个springboot工程，由于用到了 web 、thymeleaf、validator、el，引入相应的起步依赖和依赖，代码清单如下：

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

        
            org.springframework.boot
            spring-boot-starter-test
            test
        

        
            org.springframework.boot
            spring-boot-starter-thymeleaf
        
        
            org.hibernate
            hibernate-validator
        
        
            org.apache.tomcat.embed
            tomcat-embed-el
        
    

package com.forezp.entity;

import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;
/**
 * Created by fangzhipeng on 2017/4/19.
 */
public class PersonForm {

    @NotNull
    @Size(min=2, max=30)
    private String name;

    @NotNull
    @Min(18)
    private Integer age;

    public String getName() {
        return this.name;
    }

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

    public Integer getAge() {
        return age;
    }

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

    public String toString() {
        return "Person(Name: " + this.name + ", Age: " + this.age + ")";
    }
}

这个实体类，在2个属性:name,age.它们各自有验证的注解：

@Size(min=2, max=30) name的长度为2-30个字符
@NotNull 不为空
@Min(18)age不能小于18

@Controller
public class WebController extends WebMvcConfigurerAdapter {

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/results").setViewName("results");
    }

    @GetMapping("/")
    public String showForm(PersonForm personForm) {
        return "form";
    }

    @PostMapping("/")
    public String checkPersonInfo(@Valid PersonForm personForm, BindingResult bindingResult) {

        if (bindingResult.hasErrors()) {
            return "form";
        }

        return "redirect:/results";
    }
}

src/main/resources/templates/form.html:

    
        

            

                

                    
Name:
                    

                    
Name Error
                
                

                    
Age:
                    

                    
Age Error
                
                

                    
Submit
                
            
        
    

src/main/resources/templates/results.html:

html>
    
        Congratulations! You are old enough to sign up for this site.
    

启动工程，访问http://localhost:8080/：

如果你输入A和15，点击 submit:

如果name 输入N, age为空：

如果输入：forezp. 18

https://spring.io/guides/gs/v...

https://github.com/forezp/Spr...