SpringBoot 学习一：创建第一个工程

1、pom.xml 添加依赖

<?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.example</groupId>
    <artifactId>demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.2.RELEASE</version>
    </parent>

    <dependencies>

        <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>



    </dependencies>

</project>

2、在src/mian/java创建一个package，命名：controller。在controller包名下创建一个类：ChlApplication，在该类里添加如下代码：

package controller;

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

@SpringBootApplication

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

3、同样的在controller目录下再创建一个类：HelloWorldController，并添加如下代码：

package controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

@Controller

public class HelloWorldController {
    @RequestMapping("/sayhello.html")

    public @ResponseBody String say() {
        return "Spring Boot Hello ！";
    }

}

4、运行程序之后，在浏览器里面输入：http://localhost:8080/sayhello.html，浏览器里面显示：Spring Boot Hello ！