简写了几种下载日志的方法。
一、方法一
代码语言：javascript复制 @ApiOperation("日志下载")
@GetMapping("/logDownload")
public void download(HttpServletResponse response) {
try {
String mulu = "d:/logs";
ZipUtil.zip(mulu);
String path = "d:/logs.zip";
// 压缩日志
// path是指想要下载的文件的路径
File file = new File(path);
log.info(file.getPath());
// 获取文件名
String filename = file.getName();
// 获取文件后缀名
//String ext = filename.substring(filename.lastIndexOf(".") 1).toLowerCase();
//log.info("文件后缀名：" ext);
// 将文件写入输入流
FileInputStream fileInputStream = new FileInputStream(file);
InputStream fis = new BufferedInputStream(fileInputStream);
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
// 清空response
response.reset();
// 设置response的Header
response.setCharacterEncoding("UTF-8");
//Content-Disposition的作用：告知浏览器以何种方式显示响应返回的文件，用浏览器打开还是以附件的形式下载到本地保存
//attachment表示以附件方式下载 inline表示在线打开 "Content-Disposition: inline; filename=文件名.mp3"
// filename表示文件的默认名称，因为网络传输只支持URL编码的相关支付，因此需要将文件名URL编码后进行传输,前端收到后需要反编码才能获取到真正的名称
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", "" file.length());
OutputStream outputStream = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
outputStream.write(buffer);
outputStream.flush();
} catch (IOException ex) {
ex.printStackTrace();
}
}二、方法二
代码语言：javascript复制 @RequestMapping("/download")
public ResponseEntity downloadFile() {
try {
String mulu = "d:/logs";
ZipUtil.zip(mulu);
String path = "d:/logs.zip";
File file = new File(path);
InputStreamResource resource = new InputStreamResource(new FileInputStream(file));
HttpHeaders headers = new HttpHeaders();
headers.setContentLength(file.length());
headers.setContentType(MediaType.parseMediaType("application/octet-stream"));
headers.setCacheControl("must-revalidate, post-check=0, pre-check=0");
headers.add("Content-Disposition", String.format("attachment; filename="%s"", file.getName()));
return ResponseEntity.ok()
.headers(headers)
.contentLength(file.length())
.contentType(MediaType.parseMediaType("application/octet-stream"))
.body(resource);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return null;
}三、方法三
使用hutool工具类实现。
代码语言：javascript复制 @GetMapping("/download2")
public void downloadFile(HttpServletResponse response) {
try {
String mulu = "d:/logs";
ZipUtil.zip(mulu);
String path = "d:/logs.zip";
File file = new File(path);
response.reset();
response.setContentType("application/octet-stream; charset=utf-8");
response.setHeader("Content-Disposition", String.format("attachment; filename="%s"", file.getName()));
response.addHeader("Content-Length", String.valueOf(file.length()));
response.addHeader("Content-Range", String.format("bytes 0-%s/%s", file.length() - 1, file.length()));
//Hutool.copy(new FileInputStream(file), response.getOutputStream(), true);
FileInputStream fileInputStream = new FileInputStream(file);
ServletOutputStream outputStream = response.getOutputStream();
IoUtil.copy(fileInputStream, outputStream);
} catch (Exception e) {
e.printStackTrace();
}
}
