How to get file path dynamically?

debugcn Published at Dev

marzie

I write an application that load other classes from other folder like so :

public static void main(String[] args) throws Exception
{
    String rootPath = null;
    rootPath = System.getProperty("user.dir");
    //System.out.println(rootPath);

    File operatorFile = new File(rootPath + "Business\\");
    URL operatorFilePath = operatorFile.toURL();
    URL[] operatorFilePaths = new URL[]{operatorFilePath};
    ClassLoader cl = new URLClassLoader(operatorFilePaths);

    // Plus , Minus,Multiply,Divide are classes in Business folder
    Class[] operatorClass = new Class[]{ cl.loadClass("Plus"), cl.loadClass("Minus"),cl.loadClass("Multiply") , cl.loadClass("Divide")
};

I Want Dynamically get the Business folder path(My main class is in MyFolder). Both MyFolder and Business folders are in drive D:\ . But this app dose not work because I think below statement dose not correct :

File operatorFile = new File(rootPath + "Business\\");

Can anyone help me?

Anand Dwivedi

Since you Have to Remeber Some Points .

Where you Home Drive Pointed :System.getProperty("user.home");//Either C or D whatever .

or :

 rootPath = System.getProperty("user.dir")+System.getProperty("file.separator")+"Business";

  String  rootPath = System.getProperty("user.dir")+System.getProperty("file.separator")+"D"+System.getProperty("file.separator")+"MyFolder";
  rootPath=rootPath.replaceAll("MyFolder", "");//Remove MyFolder from URL
  rootPath=rootPath+"Business";//Add Business on URL
   System.out.println(""+rootPath);//Print File Path

that will Return your Home Directory With Business Folder

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