Java-Scripting

1. 简单调用

 1 /**
 2  * simple,默认java.*包中的API已经倒入到engine中。你可以使用那些API
 3  * @throws Exception
 4  */
 5 private static void invoke1() throws Exception{
 6     ScriptEngineManager engineManager = new ScriptEngineManager();
 7     ScriptEngine engine = engineManager.getEngineByName("javascript");
 8     //根据“脚本语言名称”获取执行引擎，java本身默认只支持javascript，对于其他脚本，可以
 9     //使用第三方包(apache bsf,不过不是很好用)
10     //getEngineByName方法每次都会创建一个心的Engine对象
11     //java.lang包默认已经导入
12     String script = "var message = 'This is javascript.';println(message);var total = 2;";
13     engine.eval(script);
14     Double total = (Double)engine.get("total");
15     System.out.println(total);
16 }

2. 向JS脚本传递参数

 1 /**
 2  * 向当前engine调用中put参数，并交给script
 3  * @throws Exception
 4  */
 5 private static void invoke2() throws Exception{
 6     ScriptEngineManager engineManager = new ScriptEngineManager();
 7     ScriptEngine engine = engineManager.getEngineByName("javascript");
 8     String script = "for(var i=0;i< times;i++) {println(i);}";
 9     engine.put("times", 10);
10     engine.eval(script);
11 }

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3. 在JS中使用java对象的方法或属性

1 private static void invoke3() throws Exception{
2     ScriptEngineManager engineManager = new ScriptEngineManager();
3     ScriptEngine engine = engineManager.getEngineByName("javascript");
4     String script = "println(string + ',length:' + string.length);";
5     engine.put("string", "javascript");
6     engine.eval(script);
7 }