1.参考API可见,Java的JDK中提供一个java.util.zip的接口。其压缩过程主要是通过这两个接口压缩文件或者文件夹;
java.util.zip.ZipEntry;
java.util.zip.ZipOutputStream;
2.功能实现
1)页面请求方式:
window.location.href = "/file/do_upload;
2) web端实现
@RequestMapping("/do_export")
public void test(HttpServletResponse response, String taskId) throws IOException {
long start = System.currentTimeMillis();
// 获取附件信息
List<File> files = fileService.listAllFiles(fileId);
//判断是否为excel类型文件
if(CollectionUtils.isEmpty(files)) {
LOGGER.error("查询无关联图片或者视频");
} else {
// 设置文件名
formatFileName(response, task);
ZipOutputStream zos = null;
try {
zos = new ZipOutputStream(response.getOutputStream());
for (File srcFile : files) {
if (StringUtils.isNotEmpty(srcFile.getFileHbasePath()) && StringUtils.isNotEmpty(srcFile.getFileName())) {
// 下载附件
byte[] bytes = fastDFSService.downloadFile(srcFile.getFileHbasePath());
byte[] buf = new byte[1024];
zos.putNextEntry(new ZipEntry(srcFile.getFileName()));
int len;
ByteArrayInputStream in = new ByteArrayInputStream(bytes);
while ((len = in.read(buf)) != -1){
zos.write(buf, 0, len);
}
zos.closeEntry();
}
}
long end = System.currentTimeMillis();
System.out.println("压缩完成,耗时:" + (end - start) +" ms");
} catch (Exception e) {
throw new RuntimeException("zip error from ZipUtils",e);
}finally{
if(zos != null){
try {
zos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
设置文件名字和响应信息设置
/** * @methodname formatFileName * @Description {设置响应信息和格式化附件名字} * @author admin */ private void formatFileName(HttpServletResponse response) throws UnsupportedEncodingException { String fileName = "附件文字"; Long actualEndTime = new Date().getTime(); fileName += actualEndTime + ".zip"; // 获取浏览器信息 if (request.getHeader("User-Agent").toLowerCase().indexOf("firefox") > 0) { fileName = new String(fileName.getBytes("GB2312"),"ISO-8859-1"); } else { // 处理中文文件名的问题 fileName = java.net.URLEncoder.encode(fileName, "UTF-8"); fileName = new String(fileName.getBytes("UTF-8"), "GBK"); } // 清除首部的空白行 response.reset(); // 设置Response容器的编码 response.setCharacterEncoding("UTF-8"); // 不同类型的文件对应不同的MIME类型 response.setContentType("application/x-msdownload"); response.setHeader("Content-Disposition","attachment; filename="+fileName); }
参考原文地址:
获取游览器信息:https://blog.csdn.net/w410589502/article/details/73163383
压缩文件:https://blog.csdn.net/yunyingxiaoyi/article/details/103407789
原文:https://www.cnblogs.com/blogslee/p/13035263.html