java编程中实现调用js方法分析

 /* * 加载脚本引擎，并在java中调用js方法 */ public void test2() { ScriptEngineManager manager = new ScriptEngineManager(); ScriptEngine engine = manager.getEngineByName("javascript"); try { String str="2&1"; Double d = (Double) engine.eval(str); Integer i=d.intValue(); System.out.println(i); } catch (ScriptException ex) { ex.printStackTrace(); } } 

 /* * 在java中调用js，jdk1.6中有加载js引擎类，然后由它来调用js方法。 * 并通过JDK平台给script的方法中的形参赋值 */ public void test(String name) { ScriptEngineManager sem = new ScriptEngineManager(); /* *sem.getEngineByExtension(String extension)参数为js sem.getEngineByMimeType(String mimeType) 参数为application/javascript 或者text/javascript sem.getEngineByName(String shortName)参数为js或javascript或JavaScript */ ScriptEngine se = sem.getEngineByName("js"); try { String script = "function say(){ return 'hello,'"+name+"; }"; se.eval(script); Invocable inv2 = (Invocable) se; String res=(String)inv2.invokeFunction("say",name); System.out.println(res); } catch(Exception e) { e.printStackTrace(); } } 

 /* * 演示如何将java中对象作为js中全局变量，同时演示将file类赋给脚本语言，并获得其属性。 */ public void testScriptVariables() { ScriptEngineManager sem=new ScriptEngineManager(); ScriptEngine engine=sem.getEngineByName("js"); File file=new File("c://1.txt"); engine.put("f", file); try { engine.eval("println('path:'+f.getPath())");//无法使用alert方法 } catch (ScriptException e) { e.printStackTrace(); } } 

 /* * 演示如何在java中如何通过线程来启动一个js方法 */ public void testScriptInterface() throws ScriptException { ScriptEngineManager sem=new ScriptEngineManager(); ScriptEngine engine=sem.getEngineByName("js"); String script="var obj=new Object();obj.run=function(){println('test thread')}"; engine.eval(script); Object obj=engine.get("obj");//获取js中对象 Invocable inv=(Invocable)engine; Runnable r=inv.getInterface(obj,Runnable.class); Thread t=new Thread(r); t.start(); }