springboot读取外部配置

1.pom文件修改

<build>
    <!--打包时，不将配置信息导入jar包中-->
	<resources>
		<resource>
			<directory>src/main/resources</directory>
			<excludes>
				 <exclude>**/*.*</exclude>
			</excludes>
		</resource>
	</resources>

	<plugins>
		<plugin>
			<groupId>org.apache.maven.plugins</groupId>
			<artifactId>maven-shade-plugin</artifactId>
			<dependencies>
				<dependency>
					<groupId>org.springframework.boot</groupId>
					<artifactId>spring-boot-maven-plugin</artifactId>
				</dependency>
			</dependencies>
			<configuration>
				<keepDependenciesWithProvidedScope>true</keepDependenciesWithProvidedScope>
				<createDependencyReducedPom>true</createDependencyReducedPom>
				<filters>
					<filter>
						<artifact>*:*</artifact>
						<excludes>
							<exclude>META-INF/*.SF</exclude>
							<exclude>META-INF/*.DSA</exclude>
							<exclude>META-INF/*.RSA</exclude>
						</excludes>
					</filter>
				</filters>
			</configuration>
			<executions>
				<execution>
					<phase>package</phase>
					<goals>
						<goal>shade</goal>
					</goals>
					<configuration>
						<transformers>
							<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
								<resource>META-INF/spring.handlers</resource>
							</transformer>
							<transformer implementation="org.springframework.boot.maven.PropertiesMergingResourceTransformer">
								<resource>META-INF/spring.factories</resource>
							</transformer>
							<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
								<resource>META-INF/spring.schemas</resource>
							</transformer>
							<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
							<!--主程序配置-->
							<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
								<mainClass>com.example.demo.DemoApplication</mainClass>
							</transformer>
						</transformers>
					</configuration>
				</execution>
			</executions>
		</plugin>
	</plugins>
	<defaultGoal>compile</defaultGoal>
</build>

2.将jar包和配置文件放到指定位置

3.使用java -cp启动，也可以在config下建立不同的目录区分环境例如test、dev、prod

java -cp /root/javademo/lib/*:/root/javademo/config/ com.example.demo.DemoApplication