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；