使用idea创建SpringBoot+Gradle项目

刚到公司，接触的项目是SpringBoot + Gradle的项目，之前做过的项目是Maven的项目，所以要学习一下gradle，下面就先介绍一下如何使用idea创建Gradle + SpringBoot项目，然后再介绍一下如何配置gradle，我用的idea版本是2020.1版，jdk1.8，gradle是自己下载配置的，版本是4.10.2。

创建项目

1. 选择file–>选择new–>选择–>project。
   
2. 选择Spring Initializr -->Project SDK选择已经安装的jdk，这里选择1.8 -->其他默认，然后next.
   
3. 这一步可以修改项目的名字和版本，语言等，但这里最主要的是要选择Gradle Project，然后点击next，如下
   
4. 这里选择项目需要的相关依赖，当然，后续需要什么依赖也可以在配置文件中添加，我们这里选择Web中的Spring Web，然后点击next。
   
5. 这里选择项目目录和填写项目的名字。点击finish就完成了。
   
6. 然后idea就开始自动下载gradle了。下载有时很慢，而且会失败。值得注意的是4.新以上的版本5.x，6.x等等的高版本，已经将sourceSets.main.output.classesDir改成了 sourceSets.main.output.classesDirs，所以在配置时需要注意。
   
7. 如果想要修改gradle配置，或者使用自己的gradle，可以点击file–>找到setting（mac版的idea是点击IntelliJ IDEA这几个字，在出现的下拉框中找到Preference,就是setting），然后点击Build Execution Deployment，找到Build Tools，然后找到Gradle，如下，Gradle user home是Gradle依赖库的位置，可以自定义，中间的一项打勾，然后Use Gradle from选择Specified Location，后面的选择你安装gradle的位置即可，然后点击Apply，然后点击ok。
   
8. 随后idea开始自动下载依赖。
   

到这里整个项目的创建就结束了，接下来对gradle的配置进行一个讲解。maven转gradle如下：

maven

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.hngytobacco</groupId>
    <artifactId>budget</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>budget</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <springfox.swagger2.version>2.8.0</springfox.swagger2.version>
    </properties>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.SR2</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.security.oauth.boot</groupId>
            <artifactId>spring-security-oauth2-autoconfigure</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>${springfox.swagger2.version}</version>
            <scope>compile</scope>
        </dependency>

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>${springfox.swagger2.version}</version>
            <scope>compile</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <executable>true</executable>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

build.gradle

buildscript {
    ext {
        springBootVersion = "2.1.0.RELEASE"
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}

plugins {
    id "java"
    id "idea"
    id "org.springframework.boot" version "2.1.0.RELEASE"
    id "io.spring.dependency-management" version "1.0.6.RELEASE"
}

group "com.hngytobacco"
version "1.0-SNAPSHOT"

compileJava.options.encoding = "UTF-8"
compileTestJava.options.encoding = "UTF-8"

sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8

repositories {
    mavenCentral()
}

ext {
    springCloudVersion = "Finchley.SR2"
    springfoxSwagger2Version = "2.8.0"
}

dependencyManagement {
    imports {
        mavenBom "org.springframework.cloud:spring-cloud-dependencies:${springCloudVersion}"
    }
}

dependencies{
    implementation "org.springframework.boot:spring-boot-starter-web"
    implementation "org.springframework.boot:spring-boot-starter-data-jpa"
    implementation "org.springframework.boot:spring-boot-starter-security"
    implementation "org.springframework.boot:spring-boot-starter-actuator"
    implementation "mysql:mysql-connector-java"
    implementation "org.springframework.cloud:spring-cloud-starter-config"
    implementation "org.springframework.security.oauth.boot:spring-security-oauth2-autoconfigure"
    implementation "io.springfox:springfox-swagger2:${springfoxSwagger2Version}"
    implementation "io.springfox:springfox-swagger-ui:${springfoxSwagger2Version}"
    runtimeOnly "org.springframework.boot:spring-boot-devtools"
    testImplementation "org.springframework.boot:spring-boot-starter-test"
    testImplementation "org.springframework.security:spring-security-test"
    testCompile group: "junit", name: "junit", version: "4.12"
}