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<html><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Keywords" name="Keywords"content="JavaScript, examples, JavaScript: The Definitive Guide"><title>Example 12-1 from JavaScript: The Definitive Guide, Fifth Edition</title><style>body { font-family: arial, sans-serif}.lefttitle { font: bold x-small arial, sans-serif; margin: 5px; letter-spacing: .15em; text-transform:uppercase;}.leftcaption { font: italic x-small sans-serif; margin-bottom: 20px;}#banner { font-family:sans-serif; color:#333; font-size:x-large; font-weight:normal; padding:15px; padding-top: 3px; border-bottom:4px double #666;}#banner h1 { font-size: x-large; margin: 0px; padding: 0px;}#banner .description { font-size:large; margin-left: 2px;}pre { border: solid black 1px; background-color: #ddd; padding: 10px; margin: 0px;} </style></script></head><body><div id="banner"><h1>davidflanagan.com/javascript5</h1><span class="description">Example 12-1 from<i>JavaScript: The Definitive Guide, Fifth Edition</i></span></div><div style="float: left; 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text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><pre>import javax.script.*;import java.io.*;// Evaluate a file of JavaScript and print its resultpublic class RunScript { public static void main(String[] args) throws IOException { // Obtain an interpreter or "ScriptEngine" to run the script. ScriptEngineManager scriptManager = new ScriptEngineManager(); ScriptEngine js = scriptManager.getEngineByExtension("js"); // The script file we are going to run String filename = null; // A Bindings object is a symbol table for or namespace for the // script engine. It associates names and values and makes // them available to the script. Bindings bindings = js.createBindings(); // Process the arguments. They may include any number of // -Dname=value arguments, which define variables for the script. // Any argument that does not begin with -D is taken as a filename for(int i = 0; i < args.length; i++) { String arg = args[i]; if (arg.startsWith("-D")) { int pos = arg.indexOf('='); if (pos == -1) usage(); String name = arg.substring(2, pos); String value = arg.substring(pos+1); // Note that all the variables we define are strings. // Scripts can convert them to other types if necessary. // We could also pass a java.lang.Number, a java.lang.Boolean // or any Java object or null. bindings.put(name, value); } else { if (filename != null) usage(); // only one file please filename = arg; } } // Make sure we got a file out of the arguments. if (filename == null) usage(); // Add one more binding using a special reserved variable name // to tell the script engine the name of the file it will be executing. // This allows it to provide better error messages. bindings.put(ScriptEngine.FILENAME, filename); // Get a stream to read the script. Reader in = new FileReader(filename); try { // Evaluate the script using the bindings and get its result. Object result = js.eval(in, bindings); // Display the result. System.out.println(result); } catch(ScriptException ex) { // Or display an error message. System.out.println(ex); } } static void usage() { System.err.println( "Usage: java RunScript [-Dname=value...] script.js"); System.exit(1); }}</pre><div class="lefttitle" style="padding:0px; text-align: right"><a href="index.html" tppabs="http://www.davidflanagan.com/javascript5/index.html">Table of Examples</a></div><p><script type="text/javascript">amazon_ad_tag="davidflanagancom"; amazon_ad_width="300"; amazon_ad_height="250"; amazon_ad_logo="hide";</script><script type="text/javascript" src="../../www.assoc-amazon.com/s/ads.js" tppabs="http://www.assoc-amazon.com/s/ads.js"></script></div></body></html>?? 快捷鍵說明
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