Maven，Gradle分别建立Spring-boot的demo工程

1、Maven建立spring-boot工程

Maven虽然没有官方的Wrapper，但是有一个第三方的Wrapper可以使用。
命令如下：`mvn -N io.takari:maven:wrapper`

2、创建mvn项目

mvn archetype:generate  自动化生成项目

3、在pom.xml文件中添加spring-boot包依赖

<parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>1.4.1.RELEASE</version>
  </parent>
  <dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
  </dependencies>

整体代码如下：

<?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>hello</groupId>
  <artifactId>world</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>world</name>
  <url>http://maven.apache.org</url>
  <parent>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-parent</artifactId>
      <version>1.4.1.RELEASE</version>
  </parent>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
  </dependencies>
</project>

4、在Java文件中修改App.java

package HelloWorld;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
/**
 * Hello world!
 *
 */
@SpringBootApplication
@Controller
@EnableAutoConfiguration
public class App 
{

    @RequestMapping("/")
    @ResponseBody
    String home() {
        return "Hello World!";
    }

    public static void main(String[] args) throws Exception {
        SpringApplication.run(App.class, args);
    }
}

5、启动项目

./mvnw spring-boot:run  OR  mvn spring-boot:run
./mvnw 是一个maven版本的第三方管理工具，类似于gradel的gradlew

6、gradle构建spring-boot项目
安装好gradle环境之后，在项目目录下面填写gradle配置文件build.gradle

buildscript {
    ext {
        springBootVersion = '1.5.4.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}

apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'

version = '0.0.1-SNAPSHOT'
sourceCompatibility = 1.8

repositories {
    mavenCentral()
}


dependencies {
    compile('org.springframework.boot:spring-boot-starter-web')
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

之后填写App.java文件，然后运行

./gradlew bootRun