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更新数据同步

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This commit is contained in:
gaoxq
2025-11-20 16:26:30 +08:00
parent 039cd9a635
commit 64abd84853
1 changed files with 15 additions and 22 deletions
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37
src/main/java/com/mini/capi/utils/FileUtils.java
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@@ -85,30 +85,23 @@ public class FileUtils {
/** /**
* 下载文件核心方法 * 下载文件核心方法
*/ */
public static void downloadFile(HttpServletResponse response, File file, String downloadFileName) throws IOException { public static void downloadFile(HttpServletResponse response, File file, String downloadFileName) throws Exception {
// 1. 校验文件合法性 String encodedName = URLEncoder.encode(downloadFileName, StandardCharsets.UTF_8);
if (file == null || !file.exists() || !file.isFile()) { // 设置响应头
throw new FileNotFoundException("文件不存在或不是有效文件：" + (file != null ? file.getAbsolutePath() : "null")); response.setContentType("application/octet-stream");
} response.setContentLengthLong(file.length());
if (!file.canRead()) { response.setHeader("Content-Disposition",
throw new IOException("文件无读取权限：" + file.getAbsolutePath()); String.format("attachment; filename=\"%s\"; filename*=UTF-8''%s", encodedName, encodedName));
} response.setHeader("Cache-Control", "no-cache");
// 2. 设置响应头（解决中文乱码、触发下载对话框） // 流传输（自动关闭）
response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE); // 二进制流 try (InputStream in = new BufferedInputStream(new FileInputStream(file));
String fileName = downloadFileName != null ? downloadFileName : file.getName(); OutputStream out = new BufferedOutputStream(response.getOutputStream())) {
// 文件名URLEncoder编码，兼容浏览器中文显示 byte[] buf = new byte[4096];
String encodedFileName = URLEncoder.encode(fileName, StandardCharsets.UTF_8);
response.setHeader("Content-Disposition", "attachment; filename*=UTF-8''" + encodedFileName);
response.setContentLengthLong(file.length()); // 设置文件大小（可选，优化体验）
// 3. 流传输文件（try-with-resources自动关闭流）
try (InputStream in = new FileInputStream(file);
OutputStream out = response.getOutputStream()) {
byte[] buffer = new byte[1024 * 8]; // 8KB缓冲区，提升传输效率
int len; int len;
while ((len = in.read(buffer)) != -1) { while ((len = in.read(buf)) != -1) {
out.write(buffer, 0, len); out.write(buf, 0, len);
} }
out.flush(); // 强制刷出缓冲区数据 out.flush();
} }
} }