java下载文件，文件名字是对的，但是文件大小为0 在线急！~！！！

[yaoyao1637079003]

for(FTPFile ff:files){
logger.debug("文件名称："+ff.getName());
if(ff.getName().equals(param.getFileName())){
File localFile = new File(param.getLocalPath()+"//"+ff.getName());
FileOutputStream fos = new FileOutputStream(localFile);
String fileName = param.getRemotePath() + ff.getName();
logger.debug("fileName:"+fileName);
fos.flush();
ftpClient.retrieveFile(new String(fileName.getBytes("GB2312"),"ISO-8859-1"), fos);
fos.close();
succes=true;
break;
}else{
succes=false;
}
}

我这段代码出错在哪里？ 为什么我下载的文件大小为0 文件没有后缀 只有文件名

[yaoyao1637079003]

大神 人呢 。。。。。

[云墨浅殇]

OutputStream os = null; try { filename = new String(filename.getBytes("iso-8859-1"), "UTF-8"); // String path = request.getRealPath("\\upload_file\\"+filename); String basePath = request.getSession().getServletContext() .getRealPath("/"); String uploadPath = basePath.substring(0, basePath.indexOf("crm_console")) + "upload_file/" + filename; // String uploadPath = // request.getServletContext().getRealPath("upload_file/"+filename); File file = new File(uploadPath); response.setCharacterEncoding("UTF-8"); filename = URLEncoder.encode(filename, "UTF-8"); os = response.getOutputStream(); response.reset(); response.setHeader("content-disposition", "attachment;filename=" + filename); response.setContentLength((int) file.length()); int len = 0; byte[] buffer = new byte[1024]; InputStream is = new FileInputStream(file); while ((len = is.read(buffer)) != -1) { os.write(buffer, 0, len); } is.close(); } catch (Exception e) { e.printStackTrace(); } finally { try { os.flush(); os.close(); } catch (IOException e) { } } return null;

[云墨浅殇]

OutputStream os = null; try { filename = new String(filename.getBytes("iso-8859-1"), "UTF-8"); // String path = request.getRealPath("\\upload_file\\"+filename); String basePath = request.getSession().getServletContext() .getRealPath("/"); String uploadPath = basePath.substring(0, basePath.indexOf("crm_console")) + "upload_file/" + filename; // String uploadPath = // request.getServletContext().getRealPath("upload_file/"+filename); File file = new File(uploadPath); response.setCharacterEncoding("UTF-8"); filename = URLEncoder.encode(filename, "UTF-8"); os = response.getOutputStream(); response.reset(); response.setHeader("content-disposition", "attachment;filename=" + filename); response.setContentLength((int) file.length()); int len = 0; byte[] buffer = new byte[1024]; InputStream is = new FileInputStream(file); while ((len = is.read(buffer)) != -1) { os.write(buffer, 0, len); } is.close(); } catch (Exception e) { e.printStackTrace(); } finally { try { os.flush(); os.close(); } catch (IOException e) { } } return null; 注意红色的地方,你缺少读取文件数据的方法

[yaoyao1637079003]

大神，我是用的java封装好的ftpclient 不是仅仅用 流

[tianfang]

为什么不把文件全路径名称传给retrieveFile 而要传输一个fos 下载成功后，本地文件移动，只需move方法就可以实现，何必再读取/写入？