Spring Boot - 介绍和环境搭建

介绍

Spring Boot简化了基于Spring的应用开发，你只需要”run”就能创建一个独立的，产品级别的Spring应用。话不多说，直接参见官网Spring Boot

环境

1. 安装JDK
   java -version - 检查Java安装
   安装后添加环境变量。

2. 安装Maven
   我的是Windows，方法如下：
   Adding to PATH: Add the unpacked distribution’s bin directory to your user PATH environment variable by opening up the system properties (WinKey + Pause), selecting the “Advanced” tab, and the “Environment Variables” button, then adding or selecting the PATH variable in the user variables with the value C:\Program Files\apache-maven-3.5.0\bin. The same dialog can be used to set JAVA_HOME to the location of your JDK, e.g. C:\Program Files\Java\jdk1.7.0_51
   Open a new command prompt (Winkey + R then type cmd) and run mvn -v to verify the installation.

3. 新建文件夹作为Project根目录，创建POM

   <?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">  
       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>myFirstproject</artifactId>  
       <version>0.0.1-SNAPSHOT</version>  
     
       <!-- Inherit defaults from Spring Boot -->  
       <parent>  
           <groupId>org.springframework.boot</groupId>  
           <artifactId>spring-boot-starter-parent</artifactId>  
           <version>1.4.0.BUILD-SNAPSHOT</version>  
       </parent>  
     
       <!-- Add typical dependencies for a web application -->  
       <dependencies>  
           <dependency>  
               <groupId>org.springframework.boot</groupId>  
               <artifactId>spring-boot-starter-web</artifactId>  
           </dependency>  
       </dependencies>  
     
       <!-- Package as an executable jar -->  
       <build>  
           <plugins>  
               <plugin>  
                   <groupId>org.springframework.boot</groupId>  
                   <artifactId>spring-boot-maven-plugin</artifactId>  
               </plugin>  
           </plugins>  
       </build>  
     
       <!-- Add Spring repositories -->  
       <!-- (you don't need this if you are using a .RELEASE version) -->  
       <repositories>  
           <repository>  
               <id>spring-snapshots</id>  
               <url>http://repo.spring.io/snapshot</url>  
               <snapshots><enabled>true</enabled></snapshots>  
           </repository>  
           <repository>  
               <id>spring-milestones</id>  
               <url>http://repo.spring.io/milestone</url>  
           </repository>  
       </repositories>  
       <pluginRepositories>  
           <pluginRepository>  
               <id>spring-snapshots</id>  
               <url>http://repo.spring.io/snapshot</url>  
           </pluginRepository>  
           <pluginRepository>  
               <id>spring-milestones</id>  
               <url>http://repo.spring.io/milestone</url>  
           </pluginRepository>  
       </pluginRepositories>  
   </project>

1. 编写代码
   为了完成应用程序，我们需要创建一个单独的Java文件。Maven默认会编译 src/main/java 下的源码，所以你需要创建那样的文件结构，并添加一个名为 src/main/java/FirstExample.java 的文件：

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

2. 运行
   导入工程到Eclipse，运行Maven Install，成功后，运行项目，
   启动之后就可以访问了，默认地址： http://localhost:8080/