public static void main(String[] args){
        String f="../MyApp/phone.txt"; //绝对路径:E:/我的文档/我的文档/java/MyApp/phone.txt          //注意是'/'而不是'\'
        try{  
             Runtime r=Runtime.getRuntime();  
             r.exec("cmd /c start"+f);  
        }catch(Exception e){}
    }
}