SpringBoot入门-helloworld

首先使用IDEA创建一个springboot的项目，如下

点击下一步，勾选web，下一步，直到项目完成创建。

pom.xml如下

<?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.szt</groupId>
	<artifactId>springboot-helloworld</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>springboot-helloworld</name>
	<description>Demo project for Spring Boot</description>

	<!-- Spring Boot 启动父依赖 -->
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.10.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>
		<!-- Spring Boot web依赖 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

编写controller

@Controller
public class HelloworldController {

    @ResponseBody
    @RequestMapping("/hello")
    public String sayHello(){
        return "hello,World!";
    }
}

    1. @RestController：提供实现了REST API，可以服务JSON,XML或者其他。这里是以String的形式渲染出结果。

    2. @RequestMapping：提供路由信息，"/“路径的HTTP Request都会被映射到sayHello方法进行处理。

启动类：

@SpringBootApplication
public class SpringbootHelloworldApplication {

	public static void main(String[] args) {
		SpringApplication.run(SpringbootHelloworldApplication.class, args);
	}
}

通过main函数启动，完成！