SpringBoot学习一：环境及HelloWorld

开始学习神秘的springboot，通过helloworld学习，感觉并不难，相比springmvc，简化了很多配置，myeclipse对springboot有很好的支持。

首先，需要安装springboot的插件。目录为help->Intall from Catalog->propular

点击安装。安装完成后，重启Myeclipse

注：为了下载安装，使用阿里云maven镜像，具体操作见https://blog.csdn.net/cuipeng1019/article/details/80235063

新建项目，如图所示

完成后，即可看到新建的项目

修改pom.xml配置

<?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.springboot</groupId>
	<artifactId>springboot</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>war</packaging>

	<name>springboot01</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.6.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>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-tomcat</artifactId>
			<scope>provided</scope>
		</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-configuration-processor</artifactId>
			<optional>true</optional>
		</dependency>
	</dependencies>

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


</project>

新建包controller包，新建类HelloController

package com.sm.controller;

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.sm.entity.MysqlProperties;



@RestController
public class HelloController {

	@Value("${hello}")
	private String value;
	
	@Resource
	private MysqlProperties mysqlProperties;
	
	@RequestMapping("hello")
	public String say() {
		return value;
	}
	@RequestMapping("showJdbc")
	public String showJdbc() {
		return "url:"+mysqlProperties.getUrl()+"</br>"
				+"username:"+mysqlProperties.getUsername()+"</br>"
				+"password:"+mysqlProperties.getPassword()+"</br>"
				+"driver:"+mysqlProperties.getDriver()+"</br>";
	}
}

新建包com.sm.entity，新建类MysqlProperties

package com.sm.entity;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix="jdbc")
public class MysqlProperties {

	
	
	private String url;
	
	private String username;
	
	private String password;
	
	private String driver;

	public String getUrl() {
		return url;
	}

	public void setUrl(String url) {
		this.url = url;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public String getDriver() {
		return driver;
	}

	public void setDriver(String driver) {
		this.driver = driver;
	}
	
	
}

配置applacation.properties

server.port=8081
server.context-path=/springboot01

hello=\u6211\u7231\u4F60

jdbc.url=jdbc://mysql:localhost11
jdbc.username=root
jdbc.password=sa
jdbc.driver=com.mysql.driver

项目搭建完成，分两个知识点，一是配置applacation.properties，二是取applacation.properties的两种方式取值

运行Springboot01Application.java文件