SpringBoot java 通过文件流下载文件, 页面乱码

#SpringBoot java 通过文件流下载文件, 页面乱码| 来源: 网络整理| 查看: 265

SpringBoot 通过文件流下载文件 1. 发成错误情况的结果及代码

1. 发成错误情况的结果及代码

本来是要点击下载后直接弹出下载框，下载文件的，现在直接把文件的文件的二进制乱码打印出来了

@GetMapping(value = "downLoadQualification") public void downLoadQualification(@RequestParam Integer id, HttpServletResponse response) throws UnsupportedEncodingException { this.sysFileService.getSysFile(SnyqConstants.CHECK_RECORD_FILE_CATEGORY, id); String filePath = sysFile.getFilePath(); File file = new File(filePath); String fileName = file.getName(); int i = fileName.lastIndexOf('.'); String extension = fileName.substring(i + 1); BufferedInputStream bis = null; BufferedOutputStream bos = null; try { FileInputStream fi = new FileInputStream(file); bis = new BufferedInputStream(fi); int len = 0; byte[] buffer = new byte[4 * 1024]; bos = new BufferedOutputStream(response.getOutputStream()); while ((len = bis.read(buffer, 0, buffer.length)) != -1) { bos.write(buffer, 0, len); } // 清空response response.reset(); // 设置response的Header response.setCharacterEncoding("UTF-8"); response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8")); // 告知浏览器文件的大小 response.addHeader("Content-Length", String.valueOf(file.length())); response.setContentType("application/octet-stream"); bos.flush(); response.flushBuffer(); } catch (IOException e) { throw new RuntimeException(e); } finally { try { if (bis != null) { bis.close(); } if (bos != null) { bis.close(); } } catch (IOException e) { throw new CustomException(e.getMessage()); } } }

分析之后，我感觉是这句：response.getOutputStream() 和

// 清空response response.reset(); // 设置response的Header response.setCharacterEncoding("UTF-8"); response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8")); // 告知浏览器文件的大小 response.addHeader("Content-Length", String.valueOf(file.length())); response.setContentType("application/octet-stream");

之间的先后位置有误，response的header和contentType应该在response.getOutputStream()传递给new BufferedOutputStream 这个缓冲输出流对象之前指定好参数。修改后的正确代码如下。

@GetMapping(value = "downLoadQualification") public void downLoadQualification(@RequestParam Integer id, HttpServletResponse response) throws UnsupportedEncodingException { SysFile sysFile = this.sysFileService.getSysFile(SnyqConstants.CHECK_RECORD_FILE_CATEGORY, id); String filePath = sysFile.getFilePath(); File file = new File(filePath); String fileName = file.getName(); int i = fileName.lastIndexOf('.'); String extension = fileName.substring(i + 1); // 清空response response.reset(); // 设置response的Header response.setCharacterEncoding("UTF-8"); response.addHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8")); // 告知浏览器文件的大小 response.addHeader("Content-Length", String.valueOf(file.length())); response.setContentType("application/octet-stream"); BufferedInputStream bis = null; BufferedOutputStream bos = null; try { FileInputStream fi = new FileInputStream(file); bis = new BufferedInputStream(fi); int len = 0; byte[] buffer = new byte[4 * 1024]; bos = new BufferedOutputStream(response.getOutputStream()); while ((len = bis.read(buffer, 0, buffer.length)) != -1) { bos.write(buffer, 0, len); } bos.flush(); response.flushBuffer(); } catch (IOException e) { throw new RuntimeException(e); } finally { try { if (bis != null) { bis.close(); } if (bos != null) { bis.close(); } } catch (IOException e) { throw new CustomException(e.getMessage()); } } }

之后问题解决

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