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：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
|
<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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
|
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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
|
@Controllerpublic 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:
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
|
<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:
|
1
2
3
4
5
|
html> <body> Congratulations! You are old enough to sign up for this site. </body></html> |
