14 springboot文件下载
2021-01-24 16:15
标签：dex urlencode type stream param osi ade encode cte 文件下载特别简单，给个文件路径，输出个流即可。 controller FileUtils中，对下载的文件名重新编码（setFileDownloadHeader） FileUtis中读取文件流（writeBytes） 至此ok。 14 springboot文件下载 标签：dex urlencode type stream param osi ade encode cte 原文地址：https://www.cnblogs.com/gfbzs/p/12864783.html @GetMapping(value = "/download")
@IgnoreUserToken
public void downLoad(String id, HttpServletResponse response){
Template template = templateBiz.selectById(id);
String templatePath = template.getTemplatePath();
String templateName = template.getTemplateName();
try {
//绝对路径
String targetFile = templatePath + "/" + templateName;
response.setCharacterEncoding("utf-8");
response.setContentType("multipart/form-data");
response.setHeader("Content-Disposition","attachment;fileName=" + FileUtils.setFileDownloadHeader(request, templateName));
FileUtils.writeBytes(targetFile, response.getOutputStream());
} catch (Exception e) {
log.error("下载文件失败", e);
}
}
/**
* 下载文件名重新编码
*
* @param request 请求对象
* @param fileName 文件名
* @return 编码后的文件名
*/
public static String setFileDownloadHeader(HttpServletRequest request, String fileName)
throws UnsupportedEncodingException {
final String agent = request.getHeader("USER-AGENT");
String filename = fileName;
if (agent.contains("MSIE")) {
// IE浏览器
filename = URLEncoder.encode(filename, "utf-8");
filename = filename.replace("+", " ");
} else if (agent.contains("Firefox")) {
// 火狐浏览器
filename = new String(fileName.getBytes(), "ISO8859-1");
} else if (agent.contains("Chrome")) {
// google浏览器
filename = URLEncoder.encode(filename, "utf-8");
} else {
// 其它浏览器
filename = URLEncoder.encode(filename, "utf-8");
}
return filename;
}
/**
* 输出指定文件的byte数组
*
* @param filePath 文件路径
* @param os 输出流
* @return
*/
public static void writeBytes(String filePath, OutputStream os) throws IOException {
FileInputStream fis = null;
try {
File file = new File(filePath);
if (!file.exists()) {
throw new FileNotFoundException(filePath);
}
fis = new FileInputStream(file);
byte[] b = new byte[1024];
int length;
while ((length = fis.read(b)) > 0) {
os.write(b, 0, length);
}
} catch (IOException e) {
throw e;
} finally {
if (os != null) {
try {
os.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
if (fis != null) {
try {
fis.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
}