java 在类路径上添加属性文件
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Add properties file on classpath
提问by Michal
I am building a Spring standalone application which is based on Spring Boot. I want this application to read its properties from a property file which is outside of jar file in a separate directory. The structure of the built application looks like this
我正在构建一个基于 Spring Boot 的 Spring 独立应用程序。我希望这个应用程序从一个单独目录中的 jar 文件之外的属性文件中读取它的属性。构建的应用程序的结构如下所示
testApplication
├── test-1.0-SNAPSHOT.jar
├── lib
│ └── <dependencies are here>
└── conf
└── application.properties
I want to load the application.properties file on classpath, so I am able to read in my application. Is it possible? Because when I run my jar file like this (on Windows):
我想在类路径上加载 application.properties 文件，以便我能够在我的应用程序中读取。是否可以？因为当我像这样运行我的 jar 文件时（在 Windows 上）：
java -cp "./*;lib/*;conf/*" com.myapp.Test
I get following exeption:
我得到以下例外：
Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [com.myapp.Test]; nested exception is java.io.FileNotFoundException: class path resource [application.properties] cannot be opened because it does not exist
at org.springframework.context.annotation.ConfigurationClassParser.parse(ConfigurationClassParser.java:180)
...
Caused by: java.io.FileNotFoundException: class path resource [application.properties] cannot be opened because it does not exist
at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:172)
I try to read the file from application by this Class annotation:
我尝试通过此类注释从应用程序读取文件：
@PropertySource("classpath:application.properties")
Java documentation does not mention, that a non-jar files can be loaded on classpath, but if this application.properties is in the jar file test-1.0-SNAPSHOT.jar, then it can be accessed by this way.
Java 文档没有提到可以在classpath 上加载非jar 文件，但是如果这个application.properties 在jar 文件test-1.0-SNAPSHOT.jar 中，则可以通过这种方式访问它。
Is it possible to put external non-jar file on classpath? I know I don't necessarily have the file on classpath, I can access it by different ways but still I am curious if it is possible.
是否可以将外部非 jar 文件放在类路径上？我知道我不一定在类路径上有这个文件，我可以通过不同的方式访问它，但我仍然很好奇是否可能。
回答by clovish
Try
尝试
java -cp "./*;lib/*;conf" com.myapp.Test
Asterix (*) is used to find all JARs not classes.
Asterix (*) 用于查找所有 JAR 而不是类。
回答by eg04lt3r
Sorry, remove asteriks(*) after "conf/".
抱歉，删除“conf/”后的星号(*)。
