下面列出了javax.servlet.http.HttpServletResponse#reset() 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
/**
* 文件下载并且失败的时候返回json（默认失败了会返回一个有部分数据的Excel）
*
* @since 2.1.1
*/
@GetMapping("downloadFailedUsingJson")
public void downloadFailedUsingJson(HttpServletResponse response) throws IOException {
// 这里注意 有同学反应使用swagger 会导致各种问题，请直接用浏览器或者用postman
try {
response.setContentType("application/vnd.ms-excel");
response.setCharacterEncoding("utf-8");
// 这里URLEncoder.encode可以防止中文乱码 当然和easyexcel没有关系
String fileName = URLEncoder.encode("测试", "UTF-8");
response.setHeader("Content-disposition", "attachment;filename=" + fileName + ".xlsx");
// 这里需要设置不关闭流
EasyExcel.write(response.getOutputStream(), DownloadData.class).autoCloseStream(Boolean.FALSE).sheet("模板")
.doWrite(data());
} catch (Exception e) {
// 重置response
response.reset();
response.setContentType("application/json");
response.setCharacterEncoding("utf-8");
Map<String, String> map = new HashMap<String, String>();
map.put("status", "failure");
map.put("message", "下载文件失败" + e.getMessage());
response.getWriter().println(JSON.toJSONString(map));
}
}
/**
* 获取图片
*
* @param response 服务端
* @param bucketName 存储区域
* @param firstKey 文件key
* @throws IOException
*/
public void getPhoto(HttpServletResponse response, String bucketName, String firstKey) throws IOException {
if (bucketName == null || bucketName.equals("")) {
bucketName = bucketName_user;
}
try {
InputStream fis = ossClient.getObject(bucketName, firstKey).getObjectContent();
// 设置输出的格式
response.reset();
response.setContentType("image/png");
// 循环取出流中的数据
byte[] b = new byte[100];
int len;
while ((len = fis.read(b)) > 0) {
response.getOutputStream().write(b, 0, len);
}
fis.close();
ossClient.shutdown();
} catch (IOException c) {
c.printStackTrace();
}
}
public String exportPool() {
String poolId= ContextUtil.lookupParam("poolId");
log.debug("exporting as Excel: poolid = {}", poolId);
QuestionPoolService delegate = new QuestionPoolService();
QuestionPoolFacade qPool =
delegate.getPool(new Long(poolId), AgentFacade.getAgentString());
// changed from above by gopalrc - Jan 2008
// to allow local customization of spreadsheet output
FacesContext faces = FacesContext.getCurrentInstance();
HttpServletResponse response = (HttpServletResponse)faces.getExternalContext().getResponse();
response.reset(); // Eliminate the added-on stuff
response.setHeader("Pragma", "public"); // Override old-style cache control
response.setHeader("Cache-Control", "public, must-revalidate, post-check=0, pre-check=0, max-age=0"); // New-style
writeDataToResponse(getSpreadsheetData(poolId), getDownloadFileName(qPool.getDisplayName()), response);
faces.responseComplete();
return "";
}
public ActionForward showSummaryFile(ActionMapping mapping, ActionForm actionForm, HttpServletRequest request,
HttpServletResponse response) {
CandidacySummaryFile file = ((StudentCandidacy) getDomainObject(request, "candidacyID")).getSummaryFile();
response.reset();
try {
response.getOutputStream().write(file.getContent());
response.setContentLength(file.getContent().length);
response.setContentType("application/pdf");
response.flushBuffer();
} catch (IOException e) {
logger.error(e.getMessage(), e);
}
return null;
}
private void displayPDF() throws IOException {
HttpServletResponse response = (HttpServletResponse) this.facesContext
.getExternalContext().getResponse();
response.reset();
response.setContentType(this.contentType);
response.setContentLength(this.content.length);
response.addHeader("Content-Disposition",
this.getDisplayType(this.displayType) + "; " + "filename="
+ this.filename);
response.addHeader("Accept-Ranges", "bytes");
BufferedOutputStream outputStream = new BufferedOutputStream(
response.getOutputStream());
outputStream.write(this.content);
outputStream.flush();
outputStream.close();
facesContext.responseComplete();
}
/**
* 生成代码
*/
@SneakyThrows
@PostMapping("")
public void generatorCode(@RequestBody GenConfig genConfig, HttpServletResponse response) {
byte[] data = codeGenService.generatorCode(genConfig);
response.reset();
response.setHeader(HttpHeaders.CONTENT_DISPOSITION, String.format("attachment; filename=%s.zip", genConfig.getTableName()));
response.addHeader(HttpHeaders.CONTENT_LENGTH, String.valueOf(data.length));
response.setContentType("application/octet-stream; charset=UTF-8");
IoUtil.write(response.getOutputStream(), Boolean.TRUE, data);
}
@RequestMapping(value = "/download/{id}")
public void downloadFile(@PathVariable Long id,HttpServletRequest request, HttpServletResponse response) throws Exception {
try{
if(id != 0){
EFile fileInfo = fileDao.fetch(id);
if(fileInfo!= null){
String path = fileInfo.getPath();
// String suffix = path.split("\\.")[1];
File file = new File(rootPath+path);
// String filename = fileInfo.getName()+"."+suffix;
InputStream fis = new BufferedInputStream(new FileInputStream(file));
byte[] buffer = new byte[fis.available()];
fis.read(buffer);
fis.close();
response.reset();
response.addHeader("Content-Disposition","attachment;filename="
+ new String(java.net.URLEncoder.encode(fileInfo.getName(), "UTF-8")));
response.addHeader("Content-Length","" + file.length());
response.setContentType("application/octet-stream");
OutputStream toClient = new BufferedOutputStream(
response.getOutputStream());
toClient.write(buffer);
toClient.flush();
toClient.close();
}
}
}catch(Exception e){
LOG.error("下载失败，原因："+e.getMessage());
}
}
/**
* Send a file for download.
*
* @param filePath
*
*/
protected void sendDownload(String filePath, String mimeType) {
FacesContext fc = FacesContext.getCurrentInstance();
ServletOutputStream out = null;
FileInputStream in = null;
String filename = StringUtils.substringAfterLast(filePath, File.separator);
try {
HttpServletResponse response = (HttpServletResponse) fc.getExternalContext().getResponse();
response.reset();
response.setHeader("Pragma", "public");
response.setHeader("Cache-Control","public, must-revalidate, post-check=0, pre-check=0, max-age=0");
response.setContentType(mimeType);
response.setHeader("Content-disposition", "attachment; filename=" + filename);
in = FileUtils.openInputStream(new File(filePath));
out = response.getOutputStream();
IOUtils.copy(in, out);
out.flush();
} catch (IOException ex) {
log.warn("Error generating file for download:" + ex.getMessage());
} finally {
IOUtils.closeQuietly(in);
IOUtils.closeQuietly(out);
}
fc.responseComplete();
}
/**
* 生成代码
*/
@PostMapping("/code")
public void code(@RequestBody GenConfig genConfig, HttpServletResponse response) throws IOException {
byte[] data = sysGeneratorService.generatorCode(genConfig);
response.reset();
response.setHeader("Content-Disposition", String.format("attachment; filename=%s.zip", genConfig.getTableName()));
response.addHeader("Content-Length", "" + data.length);
response.setContentType("application/octet-stream; charset=UTF-8");
IoUtil.write(response.getOutputStream(), Boolean.TRUE, data);
}
/**
* 生成代码FileUtil
*/
@GetMapping("/code")
public void makeCode(String tables, HttpServletResponse response) throws IOException {
byte[] data = sysGeneratorService.generatorCode(tables.split(","));
response.reset();
response.setHeader("Content-Disposition", "attachment; filename=\"generator.zip\"");
response.addHeader("Content-Length", "" + data.length);
response.setContentType("application/octet-stream; charset=UTF-8");
IOUtils.write(data, response.getOutputStream());
}
@RequestMapping(value = "/download")
public void download(Integer fileId, HttpServletResponse response, HttpSession session) {
Object obj = session.getAttribute("user");
if (null == obj)
return;
User user = (User) obj;
try {
File file = fileService.findFileById(fileId);
if (file.getState() == 0 || file.getUser().getUid() != user.getUid())
return;
response.reset();
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(file.getFileName(), "UTF-8"));
response.setHeader("Connection", "close");
response.setHeader("Content-Type", "application/octet-stream");
OutputStream os = response.getOutputStream();
java.io.File diskFile = new java.io.File(fileUploadProperteis.getUploadFolder()+"/"+file.getFilePath().split("/")[2]);
FileInputStream fis = new FileInputStream(diskFile);
response.setHeader("Content-Length", String.valueOf(diskFile.length()));
byte[] buf = new byte[(int) diskFile.length()];
fis.read(buf);
os.write(buf);
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Send a file for download.
*
* @param filePath
*
*/
protected void sendDownload(String filePath, String mimeType) {
FacesContext fc = FacesContext.getCurrentInstance();
ServletOutputStream out = null;
FileInputStream in = null;
String filename = StringUtils.substringAfterLast(filePath, File.separator);
try {
HttpServletResponse response = (HttpServletResponse) fc.getExternalContext().getResponse();
response.reset();
response.setHeader("Pragma", "public");
response.setHeader("Cache-Control","public, must-revalidate, post-check=0, pre-check=0, max-age=0");
response.setContentType(mimeType);
response.setHeader("Content-disposition", "attachment; filename=" + filename);
in = FileUtils.openInputStream(new File(filePath));
out = response.getOutputStream();
IOUtils.copy(in, out);
out.flush();
} catch (IOException ex) {
log.warn("Error generating file for download:" + ex.getMessage());
} finally {
IOUtils.closeQuietly(in);
IOUtils.closeQuietly(out);
}
fc.responseComplete();
}
/**
* 导出文件时为Writer生成OutputStream
*/
private static OutputStream getOutputStream(String fileName, HttpServletResponse response) {
response.reset();
response.setContentType("application/vnd.ms-excel");
try {
fileName = URLEncoder.encode(fileName, "UTF-8");
response.setHeader("Content-Disposition", "attachment; filename=" + fileName + ".xlsx");
return response.getOutputStream();
} catch (IOException e) {
throw new ExcelException("创建文件失败！");
}
}
/**
* 客户端返回字符串
* @param response
* @param string
* @return
*/
protected String renderString(HttpServletResponse response, String string, String type) {
try {
response.reset();
response.setContentType(type);
response.setCharacterEncoding("utf-8");
response.getWriter().print(string);
return null;
} catch (IOException e) {
return null;
}
}
private void responseSettings(String filename, String mimetype, HttpServletResponse response) {
// Stop IE from misbehaving
response.reset(); // Eliminate the added-on stuff
response.setHeader("Pragma", "public"); // Override old-style cache
// control
response.setHeader("Cache-Control",
"public, must-revalidate, post-check=0, pre-check=0, max-age=0"); // New-style
// Standard headers
response.setContentType(mimetype);
response.setHeader("Content-disposition", "attachment; filename=" + filename);
}
/**
* 批量生成代码
*/
@RequiresPermissions("tool:gen:code")
@Log(title = "代码生成", businessType = BusinessType.GENCODE)
@GetMapping("/batchGenCode")
@ResponseBody
public void batchGenCode(HttpServletResponse response, String tables) throws IOException {
String[] tableNames = Convert.toStrArray(tables);
byte[] data = genService.generatorCode(tableNames);
response.reset();
response.setHeader("Content-Disposition", "attachment; filename=\"ruoyi.zip\"");
response.addHeader("Content-Length", "" + data.length);
response.setContentType("application/octet-stream; charset=UTF-8");
IOUtils.write(data, response.getOutputStream());
}
/**
* 导出 Form(采用XML方式)
*
* @return
* @throws SQLException
*/
@RequestMapping(params = "doMigrateOut")
public void doMigrateOut(HttpServletRequest request,HttpServletResponse response){
String ids = request.getParameter("ids"); // 获得选择表单ID
//List<String> listSQL = new ArrayList<String>();
try {
//listSQL = MigrateForm.createSQL(ids, jdbcTemplate);// 创建查询语句
//MigrateForm.executeSQL(listSQL, jdbcTemplate);// 生成sql并拼装
List<DBTable> dbTables = MigrateForm.buildExportDbTableList(ids, jdbcTemplate); //创建导出的数据对象
//MigrateForm.generateXmlDataOutFlieContent(ids, jdbcDao);
//update by duanqilu 2013-12-05 增加多表单导出功能
String ls_id="";
if(ids.indexOf(",")>0){
ls_id=ids.substring(0, ids.indexOf(","));
}
else{
ls_id = ids;
}
CgFormHeadEntity cgFormHeadEntity = cgFormVersionDao.getCgFormById(ls_id);
//update by duanqilu 2013-12-05 增加多表单导出功能
//MigrateForm.createFile(request,cgFormHeadEntity.getTableName())
String ls_filename = cgFormHeadEntity.getTableName();// 创建文件
String destFileDir = ResourceUtil.getSystempPath()+File.separator+ls_filename;
MigrateForm.generateXmlDataOutFlieContent(dbTables, destFileDir);
ls_filename = MigrateForm.zip(null, "", destFileDir); // 压缩文件
// 文件下载
File file = new File(ls_filename);
String filename = file.getName();
InputStream fis = new BufferedInputStream(new FileInputStream(ls_filename));
// 输出生成的zip文件
// 清空response
response.reset();
// 设置response的Header
response.setContentType("text/html;charset=utf-8");
request.setCharacterEncoding("UTF-8");
response.addHeader("Content-Length", "" + file.length());
OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
response.setContentType("application/octet-stream");
response.setHeader("Content-disposition", "attachment;filename="
+ new String(filename.getBytes("utf-8"), "ISO8859-1"));
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = fis.read(buffer, 0, 8192)) != -1) {
toClient.write(buffer, 0, bytesRead);
}
toClient.write(buffer);
toClient.flush();
toClient.close();
fis.close();
logger.info("["+IpUtil.getIpAddr(request)+"][online表单配置导出]");
} catch (Exception e) {
e.printStackTrace();
}
}
public void handleRequest(Site site, HttpServletRequest req, HttpServletResponse res, String pageSlug) throws IOException,
ServletException {
if (site.getCanViewGroup().isMember(Authenticate.getUser()) || PermissionEvaluation.canAccess(Authenticate.getUser(),site)) {
if (site.getPublished()) {
try {
String baseUrl = "/" + site.getBaseUrl();
if (pageSlug.startsWith(baseUrl)) {
pageSlug = pageSlug.substring(baseUrl.length());
}
if (pageSlug.endsWith("/") && !req.getRequestURI().equals(req.getContextPath() + "/")) {
handleLeadingSlash(req, res, site);
} else if (pageSlug.startsWith("/static/")) {
handleStaticResource(req, res, site, pageSlug);
} else if (pageSlug.startsWith("/rss")) {
handleRSS(req, res, site, pageSlug);
} else {
renderer.renderCMSPage(req, res, site, pageSlug);
}
} catch (Exception e) {
logger.error("Exception while rendering CMS page " + req.getRequestURI(), e);
if (res.isCommitted()) {
return;
}
res.reset();
res.resetBuffer();
renderer.errorPage(req, res, site, 500);
}
} else {
if (Authenticate.isLogged()) {
renderer.errorPage(req, res, site, 403);
} else {
renderer.errorPage(req, res, site, 401);
}
return;
}
} else {
if (Authenticate.isLogged()) {
renderer.errorPage(req, res, site, 403);
} else {
renderer.errorPage(req, res, site, 401);
}
return;
}
}
/**
* <p>
* Write response with target relation and publishes events concerning the
* download progress based on given update action status.
* </p>
*
* <p>
* The request supports RFC7233 range requests.
* </p>
*
* @param artifact
* the artifact
* @param filename
* to be written to the client response
* @param lastModified
* unix timestamp of the artifact
* @param response
* to be sent back to the requesting client
* @param request
* from the client
* @param progressListener
* to write progress updates to
*
* @return http response
*
* @see <a href="https://tools.ietf.org/html/rfc7233">https://tools.ietf.org
* /html/rfc7233</a>
*
* @throws FileStreamingFailedException
* if streaming fails
*/
public static ResponseEntity<InputStream> writeFileResponse(final AbstractDbArtifact artifact,
final String filename, final long lastModified, final HttpServletResponse response,
final HttpServletRequest request, final FileStreamingProgressListener progressListener) {
ResponseEntity<InputStream> result;
final String etag = artifact.getHashes().getSha1();
final long length = artifact.getSize();
response.reset();
response.setHeader(HttpHeaders.CONTENT_DISPOSITION, "attachment;filename=" + filename);
response.setHeader(HttpHeaders.ETAG, etag);
response.setHeader(HttpHeaders.ACCEPT_RANGES, "bytes");
// set the x-content-type options header to prevent browsers from doing
// MIME-sniffing when downloading an artifact, as this could cause a
// security vulnerability
response.setHeader(com.google.common.net.HttpHeaders.X_CONTENT_TYPE_OPTIONS, "nosniff");
if (lastModified > 0) {
response.setDateHeader(HttpHeaders.LAST_MODIFIED, lastModified);
}
response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
response.setBufferSize(BUFFER_SIZE);
final ByteRange full = new ByteRange(0, length - 1, length);
final List<ByteRange> ranges = new ArrayList<>();
// Validate and process Range and If-Range headers.
final String range = request.getHeader("Range");
if (lastModified > 0 && range != null) {
LOG.debug("range header for filename ({}) is: {}", filename, range);
// Range header matches"bytes=n-n,n-n,n-n..."
if (!range.matches("^bytes=\\d*-\\d*(,\\d*-\\d*)*$")) {
response.setHeader(HttpHeaders.CONTENT_RANGE, "bytes */" + length);
LOG.debug("range header for filename ({}) is not satisfiable: ", filename);
return new ResponseEntity<>(HttpStatus.REQUESTED_RANGE_NOT_SATISFIABLE);
}
// RFC: if the representation is unchanged, send me the part(s) that
// I am requesting in
// Range; otherwise, send me the entire representation.
checkForShortcut(request, etag, lastModified, full, ranges);
// it seems there are valid ranges
result = extractRange(response, length, ranges, range);
// return if range extraction turned out to be invalid
if (result != null) {
return result;
}
}
// full request - no range
if (ranges.isEmpty() || ranges.get(0).equals(full)) {
LOG.debug("filename ({}) results into a full request: ", filename);
result = handleFullFileRequest(artifact, filename, response, progressListener, full);
}
// standard range request
else if (ranges.size() == 1) {
LOG.debug("filename ({}) results into a standard range request: ", filename);
result = handleStandardRangeRequest(artifact, filename, response, progressListener, ranges);
}
// multipart range request
else {
LOG.debug("filename ({}) results into a multipart range request: ", filename);
result = handleMultipartRangeRequest(artifact, filename, response, progressListener, ranges);
}
return result;
}
/**
* Try to head off a problem with downloading files from a secure HTTPS
* connection to Internet Explorer.
*
* When IE sees it's talking to a secure server, it decides to treat all hints
* or instructions about caching as strictly as possible. Immediately upon
* finishing the download, it throws the data away.
*
* Unfortunately, the way IE sends a downloaded file on to a helper
* application is to use the cached copy. Having just deleted the file,
* it naturally isn't able to find it in the cache. Whereupon it delivers
* a very misleading error message like:
* "Internet Explorer cannot download roster from sakai.yoursite.edu.
* Internet Explorer was not able to open this Internet site. The requested
* site is either unavailable or cannot be found. Please try again later."
*
* There are several ways to turn caching off, and so to be safe we use
* several ways to turn it back on again.
*
* This current workaround should let IE users save the files to disk.
* Unfortunately, errors may still occur if a user attempts to open the
* file directly in a helper application from a secure web server.
*
* TODO Keep checking on the status of this.
*/
private static void protectAgainstInstantDeletion(HttpServletResponse response) {
response.reset(); // Eliminate the added-on stuff
response.setHeader("Pragma", "public"); // Override old-style cache control
response.setHeader("Cache-Control", "public, must-revalidate, post-check=0, pre-check=0, max-age=0"); // New-style
}