基础篇：Spring Boot入门体验（图文教程）

• Spring Boot 是基于 Spring Framework 来构建的，Spring Framework 是一种 J2EE 的框架（什么是 J2EE？）

• Spring Boot 是一种快速构建 Spring 应用

• Spring Cloud 是构建 Spring Boot 分布式环境，也就是常说的云应

• Spring Boot 中流砥柱，承上启下

• 新建变量名：MAVEN_HOME 变量值：D:\server\apache-maven-3.6.0（这是我的 MAVEN 路径）

• 编辑变量名：Path 在最前面加上：%MAVEN_HOME%\bin

mvn -V

D:\space\MavenRepository\maven_jar

<!--远程仓库-->
<mirror>
  <id>aliyun</id>
  <name>aliyun Maven</name>
  <mirrorOf>*</mirrorOf>
   <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
</mirror>

• SpringbootApplication：一个带有 main() 方法的类，用于启动应用程序

• SpringbootApplicationTests：一个空的 Junit 测试了，它加载了一个使用 Spring Boot 字典配置功能的 Spring 应用程序上下文

• application.properties：一个空的 properties 文件，可以根据需要添加配置属性

• pom.xml：Maven 构建说明文件

package com.xpwi.springboot;

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

/**
 * 测试控制器
 *
 * @author: @肖朋伟CSDN
 * @create: 2018-11-18
 */
@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String hello() {
        return "Hello Spring Boot!";
    }
}

http://localhost:8080/hello

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

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

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.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-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

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


</project>

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

package com.xpwi.springboot;

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

/**
 * 测试控制器
 *
 * @author: @肖朋伟CSDN
 * @create: 2018-11-18
 */
@RestController
public class HelloController {

    // 获取.yml 文件中值
    @Value("${name}")
    private String name;

    // 获取 age
    @Value("${csdnUrl}")
    private String csdnUrl;

    //路径映射，对应浏览器访问的地址，访问该路径则执行下面函数
    @RequestMapping("/hello")
    public String hello() {
        return name + " CSDN 博客："+ csdnUrl;
    }
}

package com.xpwi.springboot;

import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

@Component
@ConfigurationProperties(prefix = "author")
public class author {
    private  String name;

    private  String csdnUrl;

    public String getCsdnUrl() {
        return csdnUrl;
    }

    public void setCsdnUrl(String csdnUrl) {
        this.csdnUrl = csdnUrl;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <optional>true</optional>
        </dependency>

package com.xpwi.springboot;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 测试控制器
 *
 * @author: @肖朋伟CSDN
 * @create: 2018-11-18
 */
@RestController
public class HelloController {

    // 获取.yml 文件中值
    //@Value("${name}")
    //private String name;

    // 获取 age
    //@Value("${csdnUrl}")
    //private String csdnUrl;

    @Autowired
    private author author;

    //路径映射，对应浏览器访问的地址，访问该路径则执行下面函数
    @RequestMapping("/hello")
    public String hello() {
        return "名字：" + author.getName() + " 地址：" + author.getCsdnUrl();
    }
}

http://localhost:8080/hello

• @Component：表明当前类是一个 Java Bean

• @ConfigurationProperties(prefix = “author”)：表示获取前缀为 author 的配置信息