在springboot中验证表单信息(六)

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>