這篇文篇主要簡述如何在springboot中驗證表單信息。在springmvc工程中，需要檢查表單信息，表單信息驗證主要通過注解的形式。

創建一個springboot工程，由于用到了 web 、thymeleaf、validator、el，引入相應的起步依賴和依賴，代碼清單如下：

      
        
            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 + ")";
    }
}

這個實體類，在2個屬性:name,age.它們各自有驗證的注解：

@Size(min=2, max=30) name的長度為2-30個字符
@NotNull 不為空
@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.
    

啟動工程，訪問http://localhost:8080/：

如果你輸入A和15，點擊 submit:

如果name 輸入N, age為空：

如果輸入：forezp. 18

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

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