读取jar文件中的目录

Question

Been trying to get this working all day but it always returns in errors and even after all the research i've done i'm still clueless

here's the method, the line that's currently returning with an error is

File file = new File( url.toURI() );

i'm unsure what it is that i have to do to make it work

public void preloadModelsTwo() {
    String slash = System.getProperty("file.separator");
    try {
        URL url = getClass().getResource("."+ slash +"Patches" + slash+"Models"+slash);
        File file = new File( url.toURI() );
        File[] fileArray = file.listFiles();
        for(int y = 0; y < fileArray.length; y++) {
            String s = fileArray[y].getName();
            if (s != "") {
                byte[] buffer = readFile("."+ slash +"Patches" + slash+"Models"+slash+""+s);
                Model.method460(buffer, Integer.parseInt(getFileNameWithoutExtension(s)));
                //System.out.println("Read model: " + s);
            }
        }
    } catch (Exception E) {
        System.out.println("error with secondary model screening");
        E.printStackTrace();
    }
}

all i'm aware of is that the stuff needs to be treated as resources, however i'm unsure what i need to change to do so, i'm sure i've made all the neccessary changes however it's still not working

any help appreciated

EDIT:

i've been messing around with this and this is the new method that seems to be working pretty well except it can't read

public String removeNonDigits(String text) {
    int length = text.length();
    StringBuffer buffer = new StringBuffer(length);
    for(int i = 0; i < length; i++) {
        char ch = text.charAt(i);
        if (Character.isDigit(ch)) {
            buffer.append(ch);
        }
    }
    return buffer.toString();
}

public JarEntry entry;
public void preloadModelsTwo() {
    String slash = System.getProperty("file.separator");
    try {
JarFile jarFile = new JarFile("SilabGarza.jar");
for(Enumeration em = jarFile.entries(); em.hasMoreElements();) {  
    String s= em.nextElement().toString();  
    if(s.contains(".dat")){
        entry = jarFile.getJarEntry(s);
        InputStream input = jarFile.getInputStream(entry);
        System.out.println("input = "+input);
        //byte[] buffer = readFile(s);
        String s2 = removeNonDigits(s);
        //Model.method460(buffer, Integer.parseInt(s2));
        System.out.println("Found: "+s);
        System.out.println("formd: "+s2);

        input.close();
    }  
}
jarFile.close();

    } catch (Exception E) {
        System.out.println("error with secondary model screening");
        E.printStackTrace();
    }
}

not sure how i'm suppose to read it (right now i have the reading commented out) any clues anyone?

Answer 1

You are wrong to use File.separator here. A resource is identified by a URL, not a filename, and URLs only have forward slashes.

You are then wrong to turn that URL into a File. It may be a URL that points inside a JAR at a remote location.

Answer 2

You can try following code:

URL url = getClass().getResource(/* resource name */);
final URL resolve = org.eclipse.core.runtime.FileLocator.resolve(url);
File file = new File( resolve.getPath());

EDIT: Oh, I just saw, you getting your url as null . Remember that getResource("resource name") looks for the resource in classpath . So your resource name should be /package/path/of/resourceName.extenstion

eg /com/kjain/widget/identifier/views/view.jpg