Spring Boot 与 Kotlin 处理Web表单提交

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2020-6-1

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="/">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/:

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参考

作者:woquanke