Spring Boot与Kotlin处理Web表单提交的方法

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/

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