如何使用this.getClass（）。getResource（String）？

Question

I cant understand what the error of this code.

public void run(String url) {

        try {
            FileInputStream file;
            file = new FileInputStream(this.getClass().getResource(url));
            Player p = new Player(file);
            p.play();
        }catch(Exception e){
            System.err.print( url + e);
        }
    }

when i try to run it, it says me "no suitable constructor found for FileInputStream(URL)". Why its happening?

Answer 1

Use:

• getClass().getResourceAsStream(classpathRelativeFile) for classpath resources
• new FileInputStream(pathtoFile) for file-system resources.

Answer 2

It is simpler to use getResourceAsStream

InputStream in = getClass().getResourceAsStream(url);
Player p = new Player(file);

Answer 3

Put the file in root of folder of your class path (folder where your .class files are generated) and then use statements below:

  InputStream inputStream = 
                  getClass().getClassLoader().getResourceAsStream(filePath);
  Player p = new Player(inputStream );

Here filePath is the relative file path wrt the root folder.

Answer 4

The parameter of FileInputStream constructor is File, String ... (see http://docs.oracle.com/javase/6/docs/api/java/io/FileInputStream.html ), but Class.getResource return URL (see http://docs.oracle.com/javase/6/docs/api/java/lang/Class.html ), not File, or String. Try to use

public void run(String url) {

    try {
        FileInputStream file;
        file = new FileInputStream(new File(this.getClass().getResource(url).toURI()));
        Player p = new Player(file);
        p.play();
    }catch(Exception e){
        System.err.print( url + e);
    }
}