Developing Kotlin Web applications using the Gradle build tool

1. Installing Gradle

Https://gradle.org/install. The author uses the Gradle Link: http://pan.baidu.com/s/1gf9qyC7 password: u3k6. Note Gradle requires jdk1.7 or higher

The zip package after download is as follows

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Unzip the ZIP package, create a new Gradle directory on the F-disk (Customize the location of the new directory) to place the extracted folder, and then copy the gradle-3.5 folder to F:\Gradle

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Configure the Gradle environment variable, append F:\Gradle\gradle-3.5\bin to the System environment variable path , point to Gradle's Bin directory, and click OK

CMD run gradle-version, as shown in the following content description installation succeeded

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2. Installing the Gradle plugin

Select Help, Eclipse Marketplace... in eclipse, enter Buildship Click Go, then select Install Gradle plugin

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Restart Eclipse when the installation is complete. Select Window ---Preferences Select Gradle. Set Gradle cache directory, point to Gradle's installation directory (customizable cache directory)

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3. developing Web applications

Create a new Gradle Project in Eclipse. Select Java EE view

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New --Other , select Gradle Project

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Select Next

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Enter a project name and then select Next

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Select the Gradle installation directory and click Finish

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The new Gradle project structure is as follows. Where Build.gradle is the master profile of the Gradle project, we only need to modify this configuration file to

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Convert Gradle project to a Web project first. Right-click the project, select Properties, and then select Project Facets

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The WebContent directory is added automatically

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Under SRC, under Main, create a new WebApp directory, then copy the folder under WebContent and create a new index.jsp, enter the content index in index.jsp, and then delete the WebContent directory. The structure is as follows

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Open the Build.gradle file with some basic configuration as well as give us the build good

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In order to compile Kotlin we need the Kotlin plugin to copy the following configuration to Build.gradle

buildscript {ext.kotlin_version = ' 1.1.2 ' repositories {jcenter ()} dependencies {Classpath "Org.jetbrains.kotlin:kotlin-gradle-plugin: $kotlin _version"} "Apply plugin: ' Kotlin '

Java plugin and War package plug-in required at the same time

Apply plugin: ' java ' Apply plugin: ' War '

Configuring a dependent library for Kotlin

dependencies {compile "org.jetbrains.kotlin:kotlin-stdlib: $kotlin _version"}

In order to develop a Web application we also need the Java EE Class Library

Providedcompile group: ' Javax ', Name: ' Javaee-api ', Version: ' 7.0 '

Here we use inline tomcat to run the application, so we need the Tomcat plugin to add the following configuration

dependencies {def tomcatversion = ' 7.0.68 ' tomcat ' org.apache.tomcat.embed:tomcat-embed-core:${tomcatversion} ', "Org.apache.tomcat.embed:tomcat-embed-logging-juli:${tomcatversion}", "Org.apache.tomcat.embed:to Mcat-embed-jasper:${tomcatversion} "}

Using the Tomcat plugin

Apply plugin: ' Com.bmuschko.tomcat '

The complete configuration is as follows

buildscript {    ext.kotlin_version =  ' 1.1.2 '       Repositories {        mavencentral ()     }      dependencies {        classpath   "Org.jetbrains.kotlin:kotlin-gradle-plugin: $kotlin _version"          classpath  ' com.bmuschko:gradle-tomcat-plugin:2.2.2 '     }}// apply the  java-library plugin to add support for java libraryapply plugin:   ' java-library ' apply plugin:  ' Kotlin ' apply plugin:  ' java ' apply plugin:  ' War ' apply plugin:  ' Com.bmuschko.tomcat '  // in this section you declare  where to find the dependencies of your projectrepositories {     //&nBsp use jcenter for resolving your dependencies.    // you  Can declare any maven/ivy/file repository here.    mavencentral () } dependencies {    // use junit test framework     testImplementation  ' junit:junit:4.12 '          providedcompile group:  ' javax ', name:  ' javaee-api ', version:  ' 7.0 '      compile  "Org.jetbrains.kotlin:kotlin-stdlib: $kotlin _version"}dependencies {     def tomcatVersion =  ' 7.0.68 '         tomcat   "Org.apache.tomcat.embed:tomcat-embed-core:${tomcatversion}",               "Org.apache.tomcat.embed:tomcat-embed-logging-juli:${tomcatversion}",               "org.apache.tomcat.embed:tomcat-embed-jasper:${ Tomcatversion} "}

Select Project Right-click Select Gradle, Refresh Gradle project, and then wait a moment

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At this time kotlin-stadlib, Javaee-api have been introduced into the CLASSPATH

The Kotlin plugin uses Src/main/kotlin as the source code directory by default and should be configured if you do not use the default Convention Sourcesets

sourcesets {main.kotlin.srcDirs + = ' Src/main/mykotlin ' main.java.srcDirs + = ' Src/main/myjava '}

Select Project Create a new source directory named Src/main/kotlin to hold the Kotlin source code

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Select Kotin view to quickly create a new Kotlin Class

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Kotlin dependencies are added automatically when new is completed

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Write the following code in HELLOWORLD.KT

Package Com.test.servlet Import Javax.servlet.http.HttpServletimport Javax.servlet.http.HttpServletRequestimport Javax.servlet.http.HttpServletResponseimport javax.servlet.annotation.WebServlet @WebServlet ("/helloworld") class Helloworld:httpservlet () {Override fun Doget (Req:httpservletrequest, Resp:httpservletresponse) {println ("en        ter the Doget method "); Resp.writer.write ("Hello, World")}}

4. running the application

Right-click the project in the Java EE view select Run as, run configurations, select Gradle Project, then select New

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Click Apply and then click Run to wait a few moments after the following words appear on the console console to start the success

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Copy Http://localhost:8080/Gradle to the browser address bar

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Enter the access path for the servlet Http://localhost:8080/Gradle/helloworld

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Developing Kotlin Web applications using the Gradle build tool