如何在工作区外部的文件夹中的java类中读取属性文件？

Question

I have a properties file located in C:/codebase/myProject-Authentication/sample.properties , and my workspace is at C:/codebase/myProject/com.company.team.website/src/.../AccessCodeServlet.java .

So, I need to read sample.properties from AccessCodeServlet.java . AccessCodeServlet is a servlet.

If the properties file is in the same folder as AccessCodeServlet.java , I can just do this:

ResourceBundle bundle = ResourceBundle.getBundle("sample");

But how do I do it when properties file is outside workspace?

Answer 1

Move the file to a relative path to the workspace before usage?

public void MovePropertiesFile()
{   

    InputStream otherStream = null;
    OutputStream workspaceStream = null;

    try{

        File afile =new File("C:\\somwhere\\.....\\properties.properties");
        File bfile =new File("C:\\workspace\\.....\\properties.properties");

        otherStream = new FileInputStream(afile);
        workspaceStream = new FileOutputStream(bfile);

        byte[] buffer = new byte[1024];

        int length;
        while ((length = otherStream .read(buffer)) > 0){

            workspaceStream .write(buffer, 0, length);

        }

        otherStream .close();
        workspaceStream .close();


    }catch(IOException e){
        e.printStackTrace();
    }
}

Answer 2

Well, you can add an external folder containing your sample.properties to the classpath in eclipse:

• Open Run Configuration
• Select <Your app entry>
• Go to "Classpath" tab
• Select "User entries"
• Click "Advanced" button
• Check "Add external folder"
• Click "OK" button
• Select your external folder with .properties file(s)

Viola - now resource bundles are found!

Answer 3

You need to specify absolute path but you shouldn't hard-code it as you correctly surmised.

You should get the base path of the file(s) from a System property which you can access using System.getProperty("basePath") in your code and which should be prepended to your file name to create an absolute path.

While running your application you can specify the path in java command line as follows:

java -DbasePath="/a/b/c" ...

... signifies the current arguments to your Java command to run your program.