根据文件下载链接地址获取文件的大小

根据网络文件的下载链接地址，获取文件的大小

直接上代码（记住要关闭相关的流）

 /** 
 * 根据地址获得数据的字节流并转换成大小 
 * @param strUrl 网络连接地址 
 * @return 
 */  
public static String getFileSizeByUrl(String strUrl){ 
    InputStream inStream=null;
    ByteArrayOutputStream outStream=null;
    String size="";
    try {  
        URL url = new URL(strUrl);  
        HttpURLConnection conn = (HttpURLConnection)();  
        ("GET");  
        (5 * 1000);  
        inStream = ();

        outStream = new ByteArrayOutputStream();  
        byte[] buffer = new byte[1024];  
        int len = 0;  
        while( (len=(buffer)) != -1 ){  
            (buffer, 0, len);  
        }
        byte[] bt =  ();

        if(null != bt &&  > 0){
            DecimalFormat df = new DecimalFormat("#.00");
            if ( < 1024) {
                size = ((double) ) + "BT";
            } else if ( < 1048576) {
                size = ((double)  / 1024) + "KB";
            } else if ( < 1073741824) {
                size = ((double)  / 1048576) + "MB";
            } else {
                size = ((double)  / 1073741824) +"GB";
            }
            ("文件大小=：" + size);  
        }else{  
            ("没有从该连接获得内容");  
        }
        ();
        ();
    } catch (Exception e) {  
        ();  
    }finally{
        try{
            if(inStream !=null){
                ();
            }
            if(outStream !=null){
                ();
            }
        } catch (IOException e) {
            ();
        }
    } 
    return size;  
}