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>
架构代码如下 :
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