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();}