Relaive file paths in Java

Question

Hi,
I have a file in c:\dev\core\CSF\csf\data\test.txt.
My current directory is c:\dev\core\CSF\csf\build
From my current working directory howdo i access test.txt using relative path.
My code from is as follows
Object.setKeystore("file://../data/test.txt"); NOte that i need a URL because the setKeystore() requires sURL as its input.The above code does not seem to change the directory from c:\dev\core\CSF\csf\build to c:\dev\core\CSF\csf\data\test.txt

Answer 1

  // Get the parent of a relative filename path
    File file = new File("Ex1.java");
    String parentPath = file.getParent();      // null
    File parentDir = file.getParentFile();     // null
    // Get the parents of an absolute filename path
    file = new File("D:\\almanac\\Ex1.java");
    parentPath = file.getParent();             // D:\almanac
    parentDir = file.getParentFile();          // D:\almanac
    parentPath = parentDir.getParent();        // D:\
    parentDir = parentDir.getParentFile();     // D:\
    parentPath = parentDir.getParent();        // null
    parentDir = parentDir.getParentFile();     // null
    //Don't have to use setKeystore... can just convert it it as follows....
    File file = new File("filename");
    // Convert the file object to a URL
    URL url = null;
    try {
        // The file need not exist. It is made into an absolute path
        // by prefixing the current working directory
        url = file.toURL();          // file:/d:/almanac1.4/java.io/filename
    } catch (MalformedURLException e) {
    // Convert the URL to a file object
    file = new File(url.getFile());  // d:/almanac1.4/java.io/filename
    // Read the file contents using the URL
    try {
        // Open an input stream
        InputStream is = url.openStream();
        // Read from is
        is.close();
    } catch (IOException e) {
        // Could not open the file
    }I hope this helps.