从gwt网址下载文件

Question

我想从互联网下载文件，我有该文件的网址。所以我写了一个下载的servlet：

public class DownloadServlet extends HttpServlet { 
    public void doGet(HttpServletRequest request, HttpServletResponse response) 
      throws IOException { 
     String pathToDownload = request.getParameter("url"); 

     URL url = new URL(pathToDownload); 
     URLConnection uc = url.openConnection(); 
     String contentType = uc.getContentType(); 
     int contentLength = uc.getContentLength(); 
     InputStream is = uc.getInputStream(); 

     response.setContentType(contentType); 
     // resp.setHeader("Content-Disposition", "attachment; filename*=\"utf-8''" + filename + ""); 
     ServletOutputStream os = response.getOutputStream(); 
     byte[] b = new byte[2048]; 
     int length; 

     while ((length = is.read(b)) != -1) { 
      os.write(b, 0, length); 
     } 
     is.close(); 
     os.close(); 
    } 
} 

在此我想说明的弹出当用户点击文件是否保存或不那么有

resp.setHeader("Content-Disposition", "attachment; filename*=\"utf-8''" + filename + ""); 

，但我想要的文件名相同作为internate的文件名，所以额外需要在上面的代码片段？

Answer 1

从上一个“/”剪切子字符串到URL字符串的末尾 - 这是您的文件名。

Answer 2

String disposition = httpConn.getHeaderField("Content-Disposition"); 
      if (disposition != null) { 
       // extracts file name from header field 

       int index = disposition.indexOf("filename="); 
       if (index != 0) { 
        fileName = disposition.substring(index + 9, 
          disposition.length()); 
       } 
      } else { 
       // extracts file name from URL 

       fileName = link.substring(link.lastIndexOf("/") + 1, 
         link.length()); 
      }