Java 在war文件中找到配置文件的相对路径

Question

I am trying to access the config.properties file which was previously placed in the config folder. after some research, I moved it to the WEB-INF folder. but even after I moved it, it still return java.lang.NullPointerException whenenver I run my my program. code used to store some password information as below:

         ClassLoader resource = ConnectionManager.class.getClass().getClassLoader();
         URL path = ConnectionManager.class.getClass().getResource("/WEB-INF/config.properties");
         
         props.load(new FileInputStream(path.getFile()));
    
         String passwordds = props.getProperty("datasource.password");

these are the codes that I found and I try to use it but still I got the null exception.

I cannot use absolute path due to this project will be deploy to production server as in.war file. please advise what is the best way as I am still beginner.

Answer 1

You should check the war your build tool generated, and find where your config file really are.

For maven project, the default resource dir is /src/main/resources/

So /src/main/resources/config.properties will be put at /WEB-INF/classes/config.properties in a war.

You can use getClass().getResourceStream("/config.properties") (getResource sometimes not work will in j2ee environment) to get it.