SpringBoot 使用maven创建springboot项目

 有两种方式可以创建  1是使用spring-boot-starter-parent ，2是使用spring-boot-dependencies （即父项目dependencyManagement)

(同理springcloud 项目也可以使用两种方式创建,推荐使用dependencyManagement,后续笔记中补充）

1.使用 spring-boot-start-parent创建

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </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>

2.使用 spring-boot-dependencies创建  （推荐使用此种方式)

2.1 创建一个父级maven项目,并在父pom中添加依赖

<dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>1.5.9.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

2.2 在子模块中 添加依赖

 <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </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>

3. 编写java代码

3.1新增一个controller

package com.itstudy.controller;

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

@RestController
public class IndexController {

    @GetMapping("/index")
    public String getIndex()
    {
        return "hello world";
    }
}

3.2 修改主函数(App.java中的main函数)

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

@SpringBootApplication
public class App {

    public static void main(String[] args) {

        SpringApplication app = new SpringApplication(App.class);
        //关闭banner
        app.setBannerMode(Banner.Mode.OFF);
        app.run(args);
    }

}

说明@SpringBootApplication会扫描 自己所在的包以及子包下面所有的类 。

如果需要扫描不在同一包下的类，需要增加

@ComponentScan({"jar包名"})

4.设置src/main/resources/application.properties

# 当server.port=0时 是随机端口
server.port=8080