Spring Boot 最简单的HelloWorld

创建一个Spring Boot，可以直接使用构建工具（Maven或Gradle）创建，也可以使用spring.io网站创建，一般会选择使用spring.io创建

使用IDEA创建一个Spring Boot项目过程如下

填写合适的项目信息

选择Spring Boot需要支持的模块

pom.xml

<?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.zln.sb</groupId>
    <artifactId>sb-helloworld</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.1.RELEASE</version>
        <relativePath/>
    </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-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>
                <configuration>
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

启动类

package com.zln.sb;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Created by sherry on 17/2/20.
 */

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

HelloWorld控制器

package com.zln.sb.c;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created by sherry on 17/2/20.
 */
@RestController
public class HelloWorld {

    /**
     * 日志
     */
    private Logger logger = LoggerFactory.getLogger(HelloWorld.class);

    @RequestMapping("/")
    public String helloworld(){
        return "Hello World 呵呵";
    }

}

启动SbApplication后，直接在浏览器输入 http://localhost:8080，出现

HelloWorld创建完毕

如果将控制器和启动类写在一起，那代码就更简单的。至于怎么实现的，在以后涉及到Spring Boot原理的讲解中会详细说明