// This example is from the book _JavaScript: The Definitive Guide_. // Written by David Flanagan. Copyright (c) 1996 O'Reilly & Associates. // This example is provided WITHOUT WARRANTY either expressed or implied. // You may study, use, modify, and distribute it for any purpose. // This is a Java code, not JavaScript code. import netscape.javascript.JSObject; // these are the classes we'll use import java.applet.Applet; import java.io.OutputStream; // An output stream that sends HTML text to a newly created Web browser window. public class HTMLOutputStream extends OutputStream { JSObject main_window; // the initial browser window JSObject window; // the new window we create JSObject document; // the document of that new window static int window_num =index.html 0; // used to give each new window a unique name // To create a new HTMLOutputStream, you must specify the applet that // will use it (this specifies a browser window) and the desired size // for the new window. public HTMLOutputStream(Applet applet, int width, int height) { // get main browser window from the applet with JSObject.getWindow() main_window = JSObject.getWindow(applet); // use JSObject.eval() to create a new window window = (JSObject) main_window.eval("self.open(''," + "'HTMLOutputStream" + window_num++ + "'," + "'menubar,status,resizable,scrollbars," + "width=" + width + ",height=" + height + "')"); // use JSObject.getMember() to get the document of this new window document = (JSObject) window.getMember("document"); // Then use JSObject.call() to open this document. document.call("open", null); } // This is the write() method required for all OutputStream subclasses. public void write(byte[] chars, int offset, int length) { // Create a string from the specified bytes String s = new String(chars, 0, offset, length); // Store the string in an array for use with JSObject.call() Object[] args = { s }; // check to see if the window has been closed boolean closed = ((Boolean)window.getMember("closed")).booleanValue(); // If not, use JSObject.call() to invoke document.write() if (!closed) document.call("write", args); } // Here are two variants on the above method, also required. public void write(byte[] chars) { write(chars, 0, chars.length); } public void write(int c) { byte[] chars = {(byte)c}; write(chars, 0, 1); } // When the stream is closed, use JSObject.call() to call Document.close public void close() { document.call("close", null); } // This method is unique to HTMLOutputStream. If the new window is // still open, use JSObject.call() to invoke Window.close() to close it. public void close_window() { boolean closed = ((Boolean)window.getMember("closed")).booleanValue(); if (!closed) window.call("close", null); } }
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