環境配置－基於Ubantu-16

Java環境配置

新增ppa   

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

Java 下載器　圖形化配置

sudo  apt-get install oracle-java8-installer

設定預設使用的Java環境變數　　該命令還可以進行Java環境版本的轉換

sudo update-java-alternatives -s java-8-oracle

 測試是否成功

java -version

sdkman包管理工具安裝

1. open a terminal and input
curl -s "https://get.sdkman.io" | bash

2. open a new terminal and input
source "$HOME/.sdkman/bin/sdkman-init.sh"

3. if all went well, the version should be displayed like this after inputing sdk version.
Sdk verion
 

Gradle配置

1. Install with sdkman
sdk install gradle 4.10.2

Maven配置

1. 安裝
sudo apt-get install maven


2.測試
mvn -v

開始HelloWorld專案

• 建立一個資料夾作為專案的根目錄　如　我的是spring-test     mkdir spring-test   
• 建立pom．xml構建管理檔案

<?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.example</groupId>
<artifactId>myproject</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.M4</version>
</parent>
<!-- Additional lines to be added here... -->
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<!-- (you don't need this if you are using a .RELEASE version) -->
<repositories>
<repository>
<id>spring-snapshots</id>
<url>https://repo.spring.io/snapshot</url>
<snapshots><enabled>true</enabled></snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<url>https://repo.spring.io/milestone</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-snapshots</id>
<url>https://repo.spring.io/snapshot</url>
</pluginRepository>
<pluginRepository>
<id>spring-milestones</id>
<url>https://repo.spring.io/milestone</url>
</pluginRepository>
</pluginRepositories>
</project>
 

• 常用命令　

  １．打包專案
  mvn package
  
  2. 檢視專案依賴
  
  mvn dependency:tree

• 編寫程式碼  在專案的根目錄建立　/src/main/java目錄結構　並在java目錄下建立Example.java檔案　　　

  import org.springframework.boot.*;
  import org.springframework.boot.autoconfigure.*;
  import org.springframework.web.bind.annotation.*;
  
  @RestController
  @EnableAutoConfiguration
  public class Example{
  
  	@RequestMapping("/")
  	String home(){
  	 return "Hello World!";
  	}
  	
  	public static void main(String[] args) throws Exception{
  	  SpringApplication.run(Example.class,args);
  	}
  }
   
  

• 執行　

  1.獲取依賴和打包檔案
  mvn package
  
  
  2.執行
  mvn spring-boot:run
  
  或者執行jar包
  java -jar target/myproject-0.0.1-SNAPSHOT.jar
  
  

  打包後的檔案目錄結構應該類似