SpringBoot 入门

Spring Boot 第一个项目： 实现Hello World

1、开发环境： eclipse + maven

附：开发springboot时，会使用内置的tomcat服务器 ，所以启动方式和web项目不同；

2、新建一个maven项目，并导入pom.xml的jar包依赖；

 <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/maven-v4_0_0.xsd">
      <modelVersion>4.0.0</modelVersion>
      <groupId>com.web.maven</groupId>
      <artifactId>02-test</artifactId>
      <packaging>war</packaging>
      <version>0.0.1-SNAPSHOT</version>
      <name>02-test Maven Webapp</name>
      <url>http://maven.apache.org</url>
      
      <parent>
    		<groupId>org.springframework.boot</groupId>
    		<artifactId>spring-boot-starter-parent</artifactId>
    		<version>2.0.2.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>
    	</properties>
    
    	<dependencies>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter</artifactId>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-test</artifactId>
    			<scope>test</scope>
    		</dependency>
    
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-devtools</artifactId>
    		</dependency>
    		<dependency>
    			<groupId>org.springframework</groupId>
    			<artifactId>springloaded</artifactId>
    			<version>1.2.8.RELEASE</version>
    		</dependency>
    	</dependencies>
    
    	<build>
    		<plugins>
    			<plugin>
    				<groupId>org.springframework.boot</groupId>
    				<artifactId>spring-boot-maven-plugin</artifactId>
    			</plugin>
    		</plugins>
    	</build>
      
    </project>

3、新建一个Application类，添加注解@SpringBootApplication，注册为一个入口类，包含主方法

package com.web;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class Application {
    	public static void main(String args[]) {
    		SpringApplication.run(Application.class,args);
    	}
    }

4、建立一个处理器：使用@RestController，该注解表示将返回值放到响应体中；处理器的位置要在Application类的所在目录的下一级目录中

 package com.web.handles;
    
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class HelloWorld {
    	@RequestMapping("/hello")
    	public String doSome(String name) {
    		return "Hello " + name + " World!";
    	}
    }
    

5、在java Application中运行Application的主方法，在浏览器中访问以下地址,就可以进行访问了

http:localhost:8080/hello?name=springboot

至此，完成springboot的第一个项目；