下载问题

[yanhuoyanyi]

我在做下载的时候有的文件下载不了.例如超过20M的东西我都不能下载是什么原因有人能帮我解决一下吗

java.io.BufferedInputStream bis=null;
java.io.BufferedOutputStream  bos=null;
try{
DoradoContext context = DoradoContext.getContext();
ServletContext servletContext = ((HttpDoradoContext) context).getRequest().getSession().getServletContext();	        
String docRoot = servletContext.getRealPath("/");
String path = new String(request.getParameter("FilePath").getBytes("ISO-8859-1"), "GBK");
String filepath=docRoot+path;
String filename = new String(request.getParameter("ReportName").getBytes("ISO-8859-1"), "GBK");
response.setContentType("application/x-msdownload");
response.setHeader("Content-disposition","attachment; filename="+new String(filename.getBytes("gb2312"),"iso8859-1"));
bis =new java.io.BufferedInputStream(new java.io.FileInputStream(filepath));
bos=new java.io.BufferedOutputStream(response.getOutputStream()); 
byte[] buff = new byte[2048];
int bytesRead;
while(-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
bos.write(buff,0,bytesRead);
 }
}
catch(Exception e){
 e.printStackTrace();
}
finally {
 if (bis != null)bis.close();
 if (bos != null)bos.close();
}

[aguai0]

关注~！

[lgwang_03]

考虑用多线程把文件分块下载试试

[yanhuoyanyi]

见笑了.我对线程一窍不通.能否高人指点下怎么试

[changjiangzhibin]

BT

[老紫竹]

直接用InputStream和OutputStream 看看！
还有你的下载不了是什么现象？ 客户端不显示下载对话框？还是服务器报错？

  java.io.InputStream bis = null;
  java.io.OutputStream bos = null;
  try {
    DoradoContext context = DoradoContext.getContext();
    ServletContext servletContext = ((HttpDoradoContext) context).getRequest().getSession().getServletContext();
    String docRoot = servletContext.getRealPath("/");
    String path = new String(request.getParameter("FilePath").getBytes("ISO-8859-1"), "GBK");
    String filepath = docRoot + path;
    String filename = new String(request.getParameter("ReportName").getBytes("ISO-8859-1"), "GBK");
    response.setContentType("application/x-msdownload");
    response.setHeader("Content-disposition", "attachment; filename="
        + new String(filename.getBytes("gb2312"), "iso8859-1"));
    bis = new java.io.FileInputStream(filepath);
    bos = response.getOutputStream();
    byte[] buff = new byte[2048];
    int bytesRead;
    while (-1 != (bytesRead = bis.read(buff))) {
      bos.write(buff, 0, bytesRead);
    }
  } catch (Exception e) {
    e.printStackTrace();
  } finally {
    if (bis != null)
      bis.close();
    if (bos != null)
      bos.close();
  }

[yanhuoyanyi]

客户端现实,也有下载但是下载一个压缩包,他只下了5K.不知道什么原因

[老紫竹]

尝试我4楼的代码看看！

[yanhuoyanyi]

谢谢你,可问题还是没解决,他还是下5K

[老紫竹]

打开那个5K的文件看看吧！也许是其他信息呢！

[yanhuoyanyi]

打开不了.提示下载文件已被损坏.
我尝试了。只要下载文件大于20M以后都有这个问题.

[老紫竹]

你不会用ultraedit 打开啊！ editplus 也行啊

[邻里亲戚]

用jspsmartupload吧,能解决你的问题