Springboot基於tomcat啓動讀取外部配置文件

原創

2020-02-22 12:29

項目結構

pom.xml

    <!-- 打包爲war包，部署在tomcat容器啓動 -->
    <packaging>war</packaging>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.4.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
			<exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
		</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>
		
		
		<!-- jsp支持開啓 -->  
        <dependency>
            <groupId>org.apache.tomcat.embed</groupId>
            <artifactId>tomcat-embed-jasper</artifactId>
        </dependency>
        <!-- servlet支持開啓，上面exclusions掉tomcat後必須加這個 -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
        </dependency>
		
	</dependencies>

	<build>
        <!-- 訪問url中的項目名 -->
		<finalName>outconfig-demo</finalName>
		<plugins>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-war-plugin</artifactId>
            <configuration>
                <failOnMissingWebXml>false</failOnMissingWebXml>
            </configuration>
			</plugin>
		</plugins>
	</build>

啓動類，App

@SpringBootApplication
public class App {
	public static void main(String[] args) {
		SpringApplication.run(App.class, args);
	}
}

配置tomcat 啓動讀取外部文件

public class AppConfig extends SpringBootServletInitializer  {
	@Override
	protected SpringApplicationBuilder configure(SpringApplicationBuilder builder) {
		return builder.sources(App.class);
	}
}

獲取屬性並賦值，指定參數

@Configuration
@PropertySource("file:${mypath.config}/application.properties")
public class DemoConfig {
	
	@Value("${user.username}")
	private String key;
	
	@Value("${user.password}")
	private String value;

	public String getKey() {
		return key;
	}

	public void setKey(String key) {
		this.key = key;
	}

	public String getValue() {
		return value;
	}

	public void setValue(String value) {
		this.value = value;
	}

	@Override
	public String toString() {
		return "DemoConfig [key=" + key + ", value=" + value + "]";
	}

}

controller測試類，預期打印出DemoConfig內容

@Controller
@RequestMapping("/test")
public class TestController {

	@Autowired
	private DemoConfig demoConfig;
	
	@RequestMapping("/getConfig")
	@ResponseBody
	public String getConfig() {
		return demoConfig.toString();
	}
}

項目下的application.properties

spring.profiles.active=outConfig

windows環境下：

D:\test 路徑下編輯 application.properties

user.username=qhf
user.password=abcdefg

eclipse 啓動 tomcat，添加參數

啓動tomcat

運行測試

linux 環境下：

打成 war 包上傳到 tomcat 的 webapps 目錄下：run as Maven build

vim /app/tomcat/tomcat-8080/bin/setenv.sh

#!/bin/bash

JAVA_HOME=/usr/local/jdk1.8.0_191

CATALINA_HOME=/app/tomcat/tomcat-8080

CATALINA_PID=/app/tomcat/tomcat-8080/bin/tomcat.pid

JAVA_OPTS="-server -Dfile.encoding=UTF-8 -Djava.awt.headless=true"
JAVA_OPTS="$JAVA_OPTS -server -Xms2G -Xmx2G -XX:MaxNewSize=512m -XX:MaxMetaspaceSize=512m -XX:MetaspaceSize=512m"

JAVA_OPTS="$JAVA_OPTS -Dmypath.config=/home/qhf"