java编程中实现调用js方法分析

本文实例讲述了java编程中实现调用js方法。分享给大家供大家参考，具体如下：

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();
     }
}

public void test(String name)
{
    scriptEngineManager sem = new scriptEngineManager();
    
    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();
    }
}

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();
    }
}

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();
}

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希望本文所述对大家java程序设计有所帮助。