使用

JavaScript engine that is bundled with Java 1.6怎么样？

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);

...

您将使用回读值

ScriptEngine.get(...)

胶水的最后一点是用函数声明包围用户的表达式,并编写一个调用该函数的表达式并将结果赋值给一个众所周知的变量.

所以要开始试验,让我们有一个函数来测试表达式：

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");

}

这会产生：

Hello World result: Hello World; expr: 'Hello World'

Simple Math result: 579.0; expr: 123 + 456

现在让我们试试你的用例：

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: ...

注意Tori最后有’D2′.