我是在log日志下載的時候出現的錯誤，查了之后發現是文件過大造成內存溢出，因而下載出錯。

報錯：java.lang.OutOfMemoryError: Java heap space

正確代碼：

@RequestMapping("/download")public void download (HttpServletResponse response,@Param("url")String url) throws IOException{String path = request.getSession().getServletContext().getRealPath("vod"+File.separator+"log"+File.separator+url); try { File file = new File(path); if (file.exists()) { String filename = file.getName(); InputStream fis = new BufferedInputStream(new FileInputStream( file)); //用BufferedInputStream讀取文件response.reset(); response.setContentType("application/x-download");response.addHeader("Content-Disposition","attachment;filename="+ new String(filename.getBytes(),"iso-8859-1"));response.addHeader("Content-Length", "" + file.length()); OutputStream toClient = new BufferedOutputStream(response.getOutputStream()); response.setContentType("application/octet-stream"); byte[] buffer = new byte[1024]; int i = -1; while ((i = fis.read(buffer)) != -1) { //不能一次性讀完，大文件會內存溢出（不能直接fis.read(buffer);）toClient.write(buffer, 0, i); } fis.close(); toClient.flush(); toClient.close(); } else { PrintWriter out = response.getWriter(); out.print("<script>"); out.print("alert(\"not find the file\")"); out.print("</script>"); } } catch (IOException ex) { PrintWriter out = response.getWriter(); out.print("<script>"); out.print("alert(\"not find the file\")"); out.print("</script>"); } }

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