使用STS4新建springboot项目

1.配置maven，自定义setting文件和仓库，一定要用阿里云镜像地址下载依赖，官方太坑了，整了半天都没弄好，原来是下载太慢文件损坏

<mirror>
　　<id>alimaven</id>
　　<mirrorOf>central</mirrorOf>
　　<name>aliyun maven</name>
　　<url>http://maven.aliyun.com/nexus/content/groups/public/</url>
</mirror>

　　

 pom 文件

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.2.1.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.example</groupId>
	<artifactId>demo-1</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>demo-1</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-web</artifactId>
		</dependency>

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
	</dependencies>

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

</project>

　　配置yml 文件和对应实体类，并注入 key1和key1主键相同老是报错 

yml 语法不会照着写就行了

server:
  port: 8080
emp:
  name: caidachun
  age: 27
  salary: 1000
  brithday: 1992/12/12
  map:
   key1: value1 
   key2: value2
  list:
   - one
   - two
  forte:
   name: java
   time: 8
    
   
  

　　

package com.example.demo;

import java.util.Date;
import java.util.List;
import java.util.Map;

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

@Component
@ConfigurationProperties(prefix = "emp")
public class Emp {
	private String name ;
	private Integer age ;
	private  Double salary ;
	private Date brithday ;
	
	private Map map;
	private List list;
	
	private Forte forte ;
	
	

　　测试类

package com.example.demo;

import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

@SpringBootTest
class Demo1ApplicationTests {
	@Autowired
	Emp emp ;
	@Test
	void contextLoads() {
		System.out.println(emp);
	}

}