/*  
 * 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();   
       
}