SpringBoot第 5 讲：SpringBoot+properties配置文件读取

一、创建Maven项目

参考：SpringBoot第 1 讲：HelloWorld_秦毅翔的专栏-CSDN博客

二、修改pom.xml

pom.xml中只需要添加springboot依赖即可

<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>
	<!-- SpringBoot支持01、parent:Begin -->
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.2.RELEASE</version>
	</parent>
	<!-- SpringBoot支持01、parent:End -->
 
	<groupId>org.personal.qin.demos</groupId>
	<artifactId>properties_read_demo</artifactId>
	<version>1.0.0-SNAPSHOT</version>
	<packaging>jar</packaging>
 
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<!-- java版本 -->
		<java.version>1.8</java.version>
	</properties>
 
	<dependencies>
		<!-- SpringBoot:Begin -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<!-- SpringBoot:End -->
 
		<!-- SpringMVC:Begin -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
		</dependency>
		<!-- SpringMVC:End -->
 
	</dependencies>
 
	<build>
		<finalName>${project.artifactId}</finalName>
		<plugins>
			<!-- 资源文件拷贝插件 -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-resources-plugin</artifactId>
				<configuration>
					<encoding>UTF-8</encoding>
				</configuration>
			</plugin>
			<!-- java编译插件 -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
					<encoding>UTF-8</encoding>
				</configuration>
			</plugin>
			<!-- SpringBoot支持03、添加SpringBoot的插件支持:Begin -->
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<!-- SpringBoot支持03、添加SpringBoot的插件支持:End -->
		</plugins>
	</build>
</project>

三、读取SpringBoot的配置文件application.properties

application.properties

server.port = 8080
server.context-path=/

ReadApplicationProperties.java

package demo.read.config;
 
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Configuration;
 
/**
 * 读取SpringBoot的properties配置文件
 */
@Configuration
@ConfigurationProperties
public class ReadApplicationProperties {
	@Value("${server.port}")
	private String port;
	
	public String read() {
		return port;
	}
}

四、读取普通properties文件

test.properties

test.demo.name = iPhone13
test.demo.num = 100
test.demo.price = 20.5

ReadNormalProperties.java

package demo.read.config;
 
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
 
/**
 * 读取普通properties配置文件
 */
@Configuration
@PropertySource(value= {"test.properties"}, ignoreResourceNotFound = false)
public class ReadNormalProperties {
	@Value("${test.demo.name}")
	private String name;
	
	@Value("${test.demo.num}")
	private int num;
	
	@Value("${test.demo.price}")
	private double price;
	
	public String read() {
		String str = "读取字符串属性："+name+"\t";
		str += "读取整型属性："+num+"\t";
		str += "读取浮点型属性："+price;
		
		return str;
	}
}

五、启动BootApplication并测试

package demo.read;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
 
import demo.read.config.ReadApplicationProperties;
import demo.read.config.ReadNormalProperties;
 
@SpringBootApplication
@RestController
public class PropertiesBootApplication {
	
	@Autowired
	private ReadNormalProperties readProperties;
	
	@Autowired
	private ReadApplicationProperties readApplicationProperties;
 
	/**
	 * 读取普通properties配置文件
	 * @return
	 */
	@GetMapping("t1")
	public String test1() {
		return readProperties.read();
	}
	
	/**
	 * 读取SpringBoot的properties配置文件
	 * @return
	 */
	@GetMapping("t2")
	public String test2() {
		return readApplicationProperties.read();
	}
	
	public static void main(String[] args) {
		SpringApplication.run(PropertiesBootApplication.class, args);
	}
}