Spring-boot　学习一

环境配置－基于Ubantu-16

Java环境配置

添加ppa

sudo add-apt-repository ppa:webupd8team/java

sudo apt-get update

Java 下载器　图形化配置

sudo  apt-get install oracle-java8-installer

设置默认使用的Java环境变量　　该命令还可以进行Java环境版本的转换

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

测试是否成功

java -version

sdkman包管理工具安装

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. 安装
sudo apt-get install maven


2.测试
mvn -v

开始HelloWorld项目

创建一个文件夹作为项目的根目录　如　我的是spring-test mkdir spring-test
创建pom．xml构建管理文件

<?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．打包项目
mvn package

2. 查看项目依赖

mvn dependency:tree

编写代码在项目的根目录创建　/src/main/java目录结构　并在java目录下创建Example.java文件　　　

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);
	}
}

运行　

1.获取依赖和打包文件
mvn package


2.运行
mvn spring-boot:run

或者运行jar包
java -jar target/myproject-0.0.1-SNAPSHOT.jar

打包后的文件目录结构应该类似

Spring-boot　学习一

运行成功　打开http://localhost:8080　　