SpringBoot非官方教程 | 第十九篇：验证表单信息

ゝ一纸荒年。 2022-06-16 00:23 87阅读 0赞

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> 本文出自[方志朋的博客][Link 1]

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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。

## 构建工程 ##

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：

<dependencies> 
    		<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>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-thymeleaf</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>org.hibernate</groupId>
    			<artifactId>hibernate-validator</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>org.apache.tomcat.embed</groupId>
    			<artifactId>tomcat-embed-el</artifactId>
    		</dependency>
    	</dependencies>

## 创建一个PresonForm的Object类 ##

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

## 创建 web Controller ##

@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";
        }
    }

## 创建form表单 ##

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

<html>
        <body>
            <form action="#" th:action="@{/}" th:object="${personForm}" method="post">
                <table>
                    <tr>
                        <td>Name:</td>
                        <td><input type="text" th:field="*{name}" /></td>
                        <td th:if="${#fields.hasErrors('name')}" th:errors="*{name}">Name Error</td>
                    </tr>
                    <tr>
                        <td>Age:</td>
                        <td><input type="text" th:field="*{age}" /></td>
                        <td th:if="${#fields.hasErrors('age')}" th:errors="*{age}">Age Error</td>
                    </tr>
                    <tr>
                        <td><button type="submit">Submit</button></td>
                    </tr>
                </table>
            </form>
        </body>
    </html>

## 注册成功的页面 ##

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

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

## 演示 ##

启动工程，访问http://localhost:8080/：

![format_png][]

如果你输入A和15，点击 submit:

![format_png 1][]

![format_png 2][]

如果name 输入N, age为空：

![format_png 3][]

如果输入：forezp. 18

![format_png 4][]

## 参考资料 ##

[https://spring.io/guides/gs/validating-form-input/][https_spring.io_guides_gs_validating-form-input]

## 源码下载 ##

[https://github.com/forezp/SpringBootLearning][https_github.com_forezp_SpringBootLearning]

### 更多阅读 ###

[史上最简单的 SpringCloud 教程汇总][SpringCloud]

[SpringBoot教程汇总][SpringBoot]

[Java面试题系列汇总][Java]

![SouthEast][]  
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[Link 1]: https://www.fangzhipeng.com/
[https_www.fangzhipeng.com_springboot_2017_05_19_sb19.html]: https://www.fangzhipeng.com/springboot/2017/05/19/sb19.html
[format_png]: /images/20220616/1d24263b4646414197494dff8820555f.png
[format_png 1]: /images/20220616/b40d682232d348f390049c61fe244763.png
[format_png 2]: /images/20220616/ec7522d2e5024b3a8d48a0377573d747.png
[format_png 3]: /images/20220616/0120de3dde46476da3418d990127f321.png
[format_png 4]: /images/20220616/238a69e617cc4e819e741bbdcf478d26.png
[https_spring.io_guides_gs_validating-form-input]: https://spring.io/guides/gs/validating-form-input/
[https_github.com_forezp_SpringBootLearning]: https://github.com/forezp/SpringBootLearning
[SpringCloud]: https://blog.csdn.net/forezp/article/details/70148833
[SpringBoot]: https://blog.csdn.net/forezp/article/details/70341818
[Java]: https://blog.csdn.net/forezp/article/details/85163411
[SouthEast]: /images/20220616/140e3bc056da4b2ea25967b15a1ea0f7.png
[Link 2]: https://www.fangzhipeng.com