如何使用Java
1.6随附的Javascript引擎呢？
您可以看到如何传递所有参数：
scriptEngineManager manager = new scriptEngineManager();scriptEngine engine = manager.getEngineByName("Javascript");engine.put("artist", artist);...您将使用读取回值
scriptEngine.get(...)
粘合的最后一点是用函数声明包围用户的表达式，并编写一个调用函数并将结果分配给众所周知的变量的表达式。
因此，开始实验，让我们有一个功能来测试表达式：
private static void printResult(final scriptEngine jsEngine, String name, String expr) throws scriptException { Object result = jsEngine.eval(expr); System.out.println(name + " result: " + result + "; expr: " + expr);}现在让我们称之为：
public static void main(String[] args) throws Exception { scriptEngineManager sem = new scriptEngineManager(); scriptEngine jsEngine = sem.getEngineByName("Javascript"); printResult(jsEngine, "Hello World", "'Hello World'"); printResult(jsEngine, "Simple Math", "123 + 456");}这将产生：
Hello World result: Hello World; expr: 'Hello World'Simple Math result: 579.0; expr: 123 + 456
现在让我们尝试一下您的用例：
public static void main(String[] args) throws Exception { scriptEngineManager sem = new scriptEngineManager(); scriptEngine jsEngine = sem.getEngineByName("Javascript"); String expr = "artist + '-' + album + (disktotal > 1 ? ('-D' + diskno) : '')"; jsEngine.put("artist", "U2"); jsEngine.put("album", "The Joshua Tree"); jsEngine.put("disktotal", 1); jsEngine.put("diskno", 1); printResult(jsEngine, "Single Disk", expr); jsEngine.put("artist", "Tori Amos"); jsEngine.put("album", "To Venus and Back"); jsEngine.put("disktotal", 2); jsEngine.put("diskno", 2); printResult(jsEngine, "Muti-Disk", expr);}产生结果：
Single Disk result: U2-The Joshua Tree; expr: ...Muti-Disk result: Tori Amos-To Venus and Back-D2; expr: ...
请注意，托里（Tori）的末尾是“ D2”。
