建一个springboot项目

1.打开 https://start.spring.io/ 新建一个maven的demo,这里选择的是1.5.18的版本

2.将自动生成的demo导入eclipse，直接选中File里的import，注意导入的要是maven project

3.导入成功后mydemo的结构

4.测试一下我们的springboot项目

①添加web依赖，pom.xml文件如下

<?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.</modelVersion>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.5..RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.example</groupId>

    <artifactId>mydemo</artifactId>

    <version>0.0.-SNAPSHOT</version>

    <name>mydemo</name>

    <description>Demo project for Spring Boot</description>

    <properties>

        <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>

    </dependencies>

    <build>

        <plugins>

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

②添加测试类TestMydemo，注意此类或者以后要添加的类都要和MydemoApplication.java在同一包，或者在它的子包，方便扫描

在同一包

在它的子包

package com.example.mydemo;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

@RestController

public class TestMydemo {

    @RequestMapping("/hello")

    public String hello(){

        return "Hello Word!mydemo test";

    }

}

③运行MydemoApplication.java：Run as -->Java Application

④访问：http://localhost:8080/hello