我们在做web开发的时候，肯定逃不过表单提交，这篇文章通过Spring Boot使用Kotlin 语言 创建和提交一个表单。
下面我们在之前《Spring Boot 与 Kotlin使用Freemarker模板引擎渲染web视图》项目的基础上，增加处理表单提交。
build.gradle 文件没有变化，这里贴一下完整的build.gradle
group 'name.quanke.kotlin'
version '1.0-SNAPSHOT'
buildscript {
ext.kotlin_version = '1.2.10'
ext.spring_boot_version = '1.5.4.RELEASE'
repositories {
mavenCentral()
}
dependencies {
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
classpath("org.springframework.boot:spring-boot-gradle-plugin:$spring_boot_version")
// Kotlin整合SpringBoot的默认无参构造函数，默认把所有的类设置open类插件
classpath("org.jetbrains.kotlin:kotlin-noarg:$kotlin_version")
classpath("org.jetbrains.kotlin:kotlin-allopen:$kotlin_version")
}
}
apply plugin: 'kotlin'
apply plugin: "kotlin-spring" // See https://kotlinlang.org/docs/reference/compiler-plugins.html#kotlin-spring-compiler-plugin
apply plugin: 'org.springframework.boot'
jar {
baseName = 'chapter11-5-4-service'
version = '0.1.0'
}
repositories {
mavenCentral()
}
dependencies {
compile "org.jetbrains.kotlin:kotlin-stdlib-jre8:$kotlin_version"
compile "org.springframework.boot:spring-boot-starter-web:$spring_boot_version"
compile "org.springframework.boot:spring-boot-starter-thymeleaf:$spring_boot_version"
// compile "com.fasterxml.jackson.module:jackson-module-kotlin:$kotlin_version"
testCompile "org.springframework.boot:spring-boot-starter-test:$spring_boot_version"
testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
}
compileKotlin {
kotlinOptions.jvmTarget = "1.8"
}
compileTestKotlin {
kotlinOptions.jvmTarget = "1.8"
}
创建实体类Hello
/** * Created by http://quanke.name on 2018/1/12. */ data class Hello(var id: Long? = 0, var content: String? = "")
创建Controller
import name.quanke.kotlin.chaper11_5_4.entity.Hello
import org.springframework.stereotype.Controller
import org.springframework.ui.ModelMap
import org.springframework.web.bind.annotation.ModelAttribute
import org.springframework.web.bind.annotation.PostMapping
import org.springframework.web.bind.annotation.RequestMapping
/**
* Created by http://quanke.name on 2018/1/10.
*/
@Controller
class HelloController {
@RequestMapping("/")
fun index(map: ModelMap): String {
// / 加入一个属性，用来在模板中读取
map.addAttribute("host", "http://quanke.name")
map.addAttribute("hello",Hello())
// return模板文件的名称，对应src/main/resources/templates/index.html
return "index"
}
@PostMapping("/hello")
fun helloPostSubmit(@ModelAttribute hello: Hello): String {
return "result"
}
}
页面展示层
src/main/resources/templates/index.html
<!DOCTYPE html>
<html xmlns:th="http://www.w3.org/1999/xhtml">
<head lang="en">
<title>quanke.name</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
</head>
<body>
<h1 th:text="${host}">Hello World</h1>
<h1>Form</h1>
<form action="#" th:action="@{/hello}" th:object="${hello}" method="post">
<p>Id: <input type="text" th:field="*{id}"/></p>
<p>Message: <input type="text" th:field="*{content}"/></p>
<p><input type="submit" value="Submit"/> <input type="reset" value="Reset"/></p>
</form>
</body>
</html>
src/main/resources/templates/result.html
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<title>Title</title>
</head>
<body>
<h1>Result</h1>
<p th:text="'id: ' + ${hello.id}"/>
<p th:text="'content: ' + ${hello.content}"/>
<a href="/" rel="external nofollow" >Submit another message</a>
</body>
</html>
Spring Boot 启动
import org.springframework.boot.SpringApplication
import org.springframework.boot.autoconfigure.SpringBootApplication
/**
* Created by http://quanke.name on 2018/1/9.
*/
@SpringBootApplication
class Application
fun main(args: Array<String>) {
SpringApplication.run(Application::class.java, *args)
}
启动工程，访问ttp://localhost:8080/:
参考：https://spring.io/guides/gs/handling-form-submission/
