使用JavaScript engine that is bundled with Java 1.6怎么样？
您可以看到如何传入所有参数：
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("JavaScript");
engine.put("artist", artist);
...
您可以使用
读回该值
ScriptEngine.get(...)
最后一点粘合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。
所以要开始实验，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: ...
请注意 Tori's 的结尾是“D2”。