标签：文件 String tar url 压缩 file new null response
直接上代码
Controller层
//我这里直接拿实体接收，entity.getFile()是List<对象>，对象里面存储文件相关的内容
@PostMapping("/zipDownload")
@ApiOperation(value = "文件导出", notes = "作者：hhs")
public Object downloadallfiles(HttpServletRequest req, HttpServletResponse response, @RequestBody BenbuBean entity) {
return benbuService.downloadallfiles(req, response, entity.getFile());
}
业务层
@Override
public ReturnObject<Object> downloadallfiles(HttpServletRequest request, HttpServletResponse response, List<UploadFile> files) {
List<String> urls = new ArrayList<String>();
ReturnObject<Object> returnObject = new ReturnObject<Object>();
if (files != null && files.size() > 0) {
for (UploadFile file : files) {
String url = sso.getPresignedObjectUrlByBucketNameAndPath(file.getBucketname(), file.getFilepath());
urls.add(url);
}
}
// 响应头的设置
response.reset();
response.setCharacterEncoding("utf-8");
response.setContentType("multipart/form-data");
response.addHeader("Access-Control-Allow-Origin","*"); //时间太长会中断连接
// 设置压缩包的名字
// 解决不同浏览器压缩包名字含有中文时乱码的问题
String downloadName = "****.zip";
String agent = request.getHeader("USER-AGENT");
try {
if (agent.contains("MSIE") || agent.contains("Trident")) {
downloadName = java.net.URLEncoder.encode(downloadName, "UTF-8");
} else {
downloadName = new String(downloadName.getBytes("UTF-8"), "ISO-8859-1"); //必写
}
} catch (Exception e) {
e.printStackTrace();
}
response.setHeader("Content-Disposition", "attachment;fileName=\"" + downloadName + "\"");
// 设置压缩流：直接写入response，实现边压缩边下载
ZipOutputStream zipos = null;
try {
zipos = new ZipOutputStream(new BufferedOutputStream(response.getOutputStream()));
zipos.setMethod(ZipOutputStream.DEFLATED); // 设置压缩方法
} catch (Exception e) {
e.printStackTrace();
}
// 循环将文件写入压缩流
DataOutputStream os = null;
int t =0;
for (String notes : urls) {
String fileName = UrlFilesToZip.getFileTypeByUrl(notes);//通过连接获取文件类型 文件名没有文件类型后缀时偶这个方法
// 这里，加上t是防止要下载的文件有重名的导致下载失败
//String fileName=notes.substring(25, 29).toUpperCase()+t;
File file = UrlFilesToZip.getFileByUrl(notes, fileName);
try {
// 添加ZipEntry，并ZipEntry中写入文件流
zipos.putNextEntry(new ZipEntry(fileName));
os = new DataOutputStream(zipos);
InputStream is = new FileInputStream(file);
byte[] b = new byte[1024];
int length = 0;
while ((length = is.read(b)) != -1) {
os.write(b, 0, length);
}
is.close();
zipos.closeEntry();
} catch (IOException e) {
e.printStackTrace();
}
}
// 关闭流
try {
os.flush();
os.close();
zipos.close();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
实体层
public class UrlFilesToZip {
private static final Logger logger = LoggerFactory.getLogger(UrlFilesToZip.class);
//url转file
public static File getFileByUrl(String fileUrl, String suffix) {
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
BufferedOutputStream stream = null;
InputStream inputStream = null;
File file = null;
try {
URL imageUrl = new URL(fileUrl);
HttpURLConnection conn = (HttpURLConnection) imageUrl.openConnection();
conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
inputStream = conn.getInputStream();
byte[] buffer = new byte[1024];
int len = 0;
while ((len = inputStream.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
file = File.createTempFile("file", suffix);
FileOutputStream fileOutputStream = new FileOutputStream(file);
stream = new BufferedOutputStream(fileOutputStream);
stream.write(outStream.toByteArray());
} catch (Exception e) {
} finally {
try {
if (inputStream != null)
inputStream.close();
if (stream != null)
stream.close();
outStream.close();
} catch (Exception e) {
}
}
return file;
}
//根据获取文件后缀
public static String getFileTypeByUrl(String url) {
String suffixes = "3fr|arw|bmp|cr2|crw|dcr|dng|eps|erf|gif|icns|ico|jpeg|jpg|mos|mrw|nef|odd|orf|pdf|pef|png|ppm|ps|psd|raf|raw|svg|svgz|tif|tiff|webp|x3f|xcf|xps| 7z|ace|alz|arc|arj|bz|bz2|cab|cpio|deb|dmg|eml|gz|img|iso|jar|lha|lz|lzma|lzo|rar|rpm|rz|tar|tar.7z|tar.bz|tar.bz2|tar.gz|tar.lzo|tar.xz|tar.Z|tbz|tbz2|tgz|tZ|tzo|xz|z|zip|aac|ac3|aif|aifc|aiff|amr|caf|flac|m4a|m4b|mp3|oga|ogg|sf2|sfark|voc|wav|weba|wma| 3g2|3gp|3gpp|avi|cavs|dv|dvr|flv|gif|m2ts|m4v|mkv|mod|mov|mp4|mpeg|mpg|mts|mxf|ogg|rm|rmvb|swf|ts|vob|webm|wmv|wtv| abw|djvu|doc|docm|docx|html|lwp|md|odt|pages|pages.zip|pdf|rst|rtf|sdw|tex|txt|wpd|wps|zabw|eps|html|key|key.zip|odp|pdf|pps|ppsx|ppt|pptm|pptx|ps|sda|swf| csv|html|numbers|numbers.zip|ods|pdf|sdc|xls|xlsm|xlsx|azw|azw3|azw4|cbc|cbr|cbz|chm|docx|epub|fb2|htm|html|htmlz|lit|lrf|mobi|odt|oeb|pdb|pdf|pml|prc|rb|rtf|snb|tcr|txt|txtz|eot|otf|ttf|woff|dwg|dxf|ai|cdr|cgm|emf|eps|pdf|ps|sk|sk1|svg|svgz|vsd|wmf|website";
Pattern pat = Pattern.compile("[\\w]+[\\.](" + suffixes + ")");// 正则判断
Matcher mc = pat.matcher(url);// 条件匹配
String substring = "";
while (mc.find()) {
substring = mc.group();// 截取文件名后缀名
}
return substring;
}
`
标签：文件,String,tar,url,压缩,file,new,null,response 来源： https://www.cnblogs.com/hhs-5120/p/16656848.html
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