Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler //www.49028c.com");

//判斷當前系統是否支持Java AWT Desktop擴展
        if(java.awt.Desktop.isDesktopSupported()){
            try{
                //創建一個URI實例,注意不是URL
                java.net.URI uri=java.net.URI.create("http://www.49028c.com");
                //獲取當前系統桌面擴展
                java.awt.Desktop dp=java.awt.Desktop.getDesktop();
                //判斷系統桌面是否支持要執行的功能
                if(dp.isSupported(java.awt.Desktop.Action.BROWSE)){
                    //獲取系統默認瀏覽器打開鏈接
                    dp.browse(uri);
                }
            }catch(java.lang.NullPointerException e){
                //此為uri為空時拋出異常
            }catch(java.io.IOException e){
                //此為無法獲取系統默認瀏覽器
            }
        }