Java调用JavaScript

必须jre6才行，要不需要用开源库了
   package script;

import javax.script.*;
/**
* Java调用JavaScript示例
*
* @author Birdshover
*
*/
public final class scriptMaster {
    /**
     * 运行指定脚本
     * @return 返回脚本值
     */
    public int run() {
        ScriptEngineManager m = new ScriptEngineManager();
        ScriptEngine engine = m.getEngineByExtension("js");
        try{
            engine.eval("var t=1;t++;");
            engine.eval("t++;");
        }catch(ScriptException ex){
            return -1;
        }
        Float val = Float.parseFloat(engine.get("t").toString());
        return val.intValue();
    }
}
java调用javascript,而javascript内部又调用了java的类库。
public String now(){
        ScriptEngineManager m = new ScriptEngineManager();
        ScriptEngine engine = m.getEngineByExtension("js");
        try{
            engine.eval("var t= new java.util.Date();");
        }catch(ScriptException ex){
            return (new Date()).toString();
        }
        return engine.get("t").toString();
    }