INTRODUCTION TO JAVA PROGRAMMING教学（华南理工）16slideapplets and multimedia.pptVIP

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INTRODUCTION TO JAVA PROGRAMMING教学（华南理工）16slideapplets and multimedia.ppt

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* Locating Resource Using the URL Class The .URL class can be used to identify files (image, audio, text, etc.) on the Internet. In general, a URL (Uniform Resource Locator) is a pointer to a “resource” on the World Wide Web on a local machine or a remote host. A resource can be something as simple as a file or a directory. An URL for a file can also be accessed by class code in a way that is independent of the location of the file as long as the file is located in the class directory. Recall that the class directory is where the class (i.e., the .class file) is stored. For example, all the classes in this book are stored in c:\book. So the class directory is c:\book. * Creating a URL from a Class Reference As discussed in §9.11.5, “The getClass Method,” when a class is loaded, the JVM creates a meta-object for the class, which can be obtained using java.lang.Class metaObject = this.getClass(); The Class class provides access to useful information about the class, such as the data fields, constructors, and methods. It also contains the getResource(filename) method, which can be used to obtain the URL of a given file name in the class directory. To obtain the URL of a file in the class directory, use URL url = metaObject.getResource(filename); For example, suppose the class directory is c:\book, the following statements create a URL for c:\book\image\us.gif. Class metaObject = this.getClass(); URL url = metaObject.getResource(image/us.gif); You can now create an ImageIcon using ImageIcon imageIcon = new ImageIcon(url); * Displaying Image Write a program that displays an image from /image/us.gif in the class directory on a panel. DisplayImageWithURL Run * Creating AudioClip from an Audio File To play an audio file in an applet, first create an audio clip object for the audio file. The audio clip is created once and can be played repeatedly without reloading the file. To create an audio clip, use the static method newAudioClip() in the java.applet.Applet class: ?