jsp上传超大文件解决方案
1,项目调研
因为需要研究下断点上传的问题。找了很久终于找到一个比较好的项目。
在GoogleCode上面,代码弄下来超级不方便,还是配置hosts才好,把代码重新上传到了github上面。
https://github.com/freewebsys/java-large-file-uploader-demo
效果:
上传中,显示进度,时间,百分比。
点击【Pause】暂停,点击【Resume】继续。
2,代码分析
原始项目:
https://code.google.com/p/java-large-file-uploader/
这个项目最后更新的时间是 2012 年,项目进行了封装使用最简单的方法实现了http的断点上传。
因为html5 里面有读取文件分割文件的类库,所以才可以支持断点上传,所以这个只能在html5 支持的浏览器上面展示。
同时,在js 和 java 同时使用 cr32 进行文件块的校验,保证数据上传正确。
代码在使用了最新的servlet 3.0 的api,使用了异步执行,监听等方法。
上传类UploadServlet
@Component("javaLargeFileUploaderServlet")
@WebServlet(name = "javaLargeFileUploaderServlet", urlPatterns = { "/javaLargeFileUploaderServlet" })
public class UploadServlet extends HttpRequestHandlerServlet
implements HttpRequestHandler {
private static final Logger log = LoggerFactory.getLogger(UploadServlet.class);
@Autowired
UploadProcessor uploadProcessor;
@Autowired
FileUploaderHelper fileUploaderHelper;
@Autowired
ExceptionCodeMappingHelper exceptionCodeMappingHelper;
@Autowired
Authorizer authorizer;
@Autowired
StaticStateIdentifierManager staticStateIdentifierManager;
@Override
public void handleRequest(HttpServletRequest request, HttpServletResponse response)
throws IOException {
log.trace("Handling request");
Serializable jsonObject = null;
try {
// extract the action from the request
UploadServletAction actionByParameterName =
UploadServletAction.valueOf(fileUploaderHelper.getParameterValue(request, UploadServletParameter.action));
// check authorization
checkAuthorization(request, actionByParameterName);
// then process the asked action
jsonObject = processAction(actionByParameterName, request);
// if something has to be written to the response
if (jsonObject != null) {
fileUploaderHelper.writeToResponse(jsonObject, response);
}
}
// If exception, write it
catch (Exception e) {
exceptionCodeMappingHelper.processException(e, response);
}
}
private void checkAuthorization(HttpServletRequest request, UploadServletAction actionByParameterName)
throws MissingParameterException, AuthorizationException {
// check authorization
// if its not get progress (because we do not really care about authorization for get
// progress and it uses an array of file ids)
if (!actionByParameterName.equals(UploadServletAction.getProgress)) {
// extract uuid
final String fileIdFieldValue = fileUploaderHelper.getParameterValue(request, UploadServletParameter.fileId, false);
// if this is init, the identifier is the one in parameter
UUID clientOrJobId;
String parameter = fileUploaderHelper.getParameterValue(request, UploadServletParameter.clientId, false);
if (actionByParameterName.equals(UploadServletAction.getConfig) && parameter != null) {
clientOrJobId = UUID.fromString(parameter);
}
// if not, get it from manager
else {
clientOrJobId = staticStateIdentifierManager.getIdentifier();
}
// call authorizer
authorizer.getAuthorization(
request,
actionByParameterName,
clientOrJobId,
fileIdFieldValue != null ? getFileIdsFromString(fileIdFieldValue).toArray(new UUID[] {}) : null);
}
}
private Serializable processAction(UploadServletAction actionByParameterName, HttpServletRequest request)
throws Exception {
log.debug("Processing action " + actionByParameterName.name());
Serializable returnObject = null;
switch (actionByParameterName) {
case getConfig:
String parameterValue = fileUploaderHelper.getParameterValue(request, UploadServletParameter.clientId, false);
returnObject =
uploadProcessor.getConfig(
parameterValue != null ? UUID.fromString(parameterValue) : null);
break;
case verifyCrcOfUncheckedPart:
returnObject = verifyCrcOfUncheckedPart(request);
break;
case prepareUpload:
returnObject = prepareUpload(request);
break;
case clearFile:
uploadProcessor.clearFile(UUID.fromString(fileUploaderHelper.getParameterValue(request, UploadServletParameter.fileId)));
break;
case clearAll:
uploadProcessor.clearAll();
break;
case pauseFile:
List<UUID> uuids = getFileIdsFromString(fileUploaderHelper.getParameterValue(request, UploadServletParameter.fileId));
uploadProcessor.pauseFile(uuids);
break;
case resumeFile:
returnObject =
uploadProcessor.resumeFile(UUID.fromString(fileUploaderHelper.getParameterValue(request, UploadServletParameter.fileId)));
break;
case setRate:
uploadProcessor.setUploadRate(UUID.fromString(fileUploaderHelper.getParameterValue(request, UploadServletParameter.fileId)),
Long.valueOf(fileUploaderHelper.getParameterValue(request, UploadServletParameter.rate)));
break;
case getProgress:
returnObject = getProgress(request);
break;
}
return returnObject;
}
List<UUID> getFileIdsFromString(String fileIds) {
String[] splittedFileIds = fileIds.split(",");
List<UUID> uuids = Lists.newArrayList();
for (int i = 0; i < splittedFileIds.length; i++) {
uuids.add(UUID.fromString(splittedFileIds[i]));
}
return uuids;
}
private Serializable getProgress(HttpServletRequest request)
throws MissingParameterException {
Serializable returnObject;
String[] ids =
new Gson()
.fromJson(fileUploaderHelper.getParameterValue(request, UploadServletParameter.fileId), String[].class);
Collection<UUID> uuids = Collections2.transform(Arrays.asList(ids), new Function<String, UUID>() {
@Override
public UUID apply(String input) {
return UUID.fromString(input);
}
});
returnObject = Maps.newHashMap();
for (UUID fileId : uuids) {
try {
ProgressJson progress = uploadProcessor.getProgress(fileId);
((HashMap<String, ProgressJson>) returnObject).put(fileId.toString(), progress);
}
catch (FileNotFoundException e) {
log.debug("No progress will be retrieved for " + fileId + " because " + e.getMessage());
}
}
return returnObject;
}
private Serializable prepareUpload(HttpServletRequest request)
throws MissingParameterException, IOException {
// extract file information
PrepareUploadJson[] fromJson =
new Gson()
.fromJson(fileUploaderHelper.getParameterValue(request, UploadServletParameter.newFiles), PrepareUploadJson[].class);
// prepare them
final HashMap<String, UUID> prepareUpload = uploadProcessor.prepareUpload(fromJson);
// return them
return Maps.newHashMap(Maps.transformValues(prepareUpload, new Function<UUID, String>() {
public String apply(UUID input) {
return input.toString();
};
}));
}
private Boolean verifyCrcOfUncheckedPart(HttpServletRequest request)
throws IOException, MissingParameterException, FileCorruptedException, FileStillProcessingException {
UUID fileId = UUID.fromString(fileUploaderHelper.getParameterValue(request, UploadServletParameter.fileId));
try {
uploadProcessor.verifyCrcOfUncheckedPart(fileId,
fileUploaderHelper.getParameterValue(request, UploadServletParameter.crc));
}
catch (InvalidCrcException e) {
// no need to log this exception, a fallback behaviour is defined in the
// throwing method.
// but we need to return something!
return Boolean.FALSE;
}
return Boolean.TRUE;
}
}
异步上传UploadServletAsync
@Component("javaLargeFileUploaderAsyncServlet")
@WebServlet(name = "javaLargeFileUploaderAsyncServlet", urlPatterns = { "/javaLargeFileUploaderAsyncServlet" }, asyncSupported = true)
public class UploadServletAsync extends HttpRequestHandlerServlet
implements HttpRequestHandler {
private static final Logger log = LoggerFactory.getLogger(UploadServletAsync.class);
@Autowired
ExceptionCodeMappingHelper exceptionCodeMappingHelper;
@Autowired
UploadServletAsyncProcessor uploadServletAsyncProcessor;
@Autowired
StaticStateIdentifierManager staticStateIdentifierManager;
@Autowired
StaticStateManager<StaticStatePersistedOnFileSystemEntity> staticStateManager;
@Autowired
FileUploaderHelper fileUploaderHelper;
@Autowired
Authorizer authorizer;
/**
* Maximum time that a streaming request can take.<br>
*/
private long taskTimeOut = DateUtils.MILLIS_PER_HOUR;
@Override
public void handleRequest(final HttpServletRequest request, final HttpServletResponse response)
throws ServletException, IOException {
// process the request
try {
//check if uploads are allowed
if (!uploadServletAsyncProcessor.isEnabled()) {
throw new UploadIsCurrentlyDisabled();
}
// extract stuff from request
final FileUploadConfiguration process = fileUploaderHelper.extractFileUploadConfiguration(request);
log.debug("received upload request with config: "+process);
// verify authorization
final UUID clientId = staticStateIdentifierManager.getIdentifier();
authorizer.getAuthorization(request, UploadServletAction.upload, clientId, process.getFileId());
//check if that file is not paused
if (uploadServletAsyncProcessor.isFilePaused(process.getFileId())) {
log.debug("file "+process.getFileId()+" is paused, ignoring async request.");
return;
}
// get the model
StaticFileState fileState = staticStateManager.getEntityIfPresent().getFileStates().get(process.getFileId());
if (fileState == null) {
throw new FileNotFoundException("File with id " + process.getFileId() + " not found");
}
// process the request asynchronously
final AsyncContext asyncContext = request.startAsync();
asyncContext.setTimeout(taskTimeOut);
// add a listener to clear bucket and close inputstream when process is complete or
// with
// error
asyncContext.addListener(new UploadServletAsyncListenerAdapter(process.getFileId()) {
@Override
void clean() {
log.debug("request " + request + " completed.");
// we do not need to clear the inputstream here.
// and tell processor to clean its shit!
uploadServletAsyncProcessor.clean(clientId, process.getFileId());
}
});
// then process
uploadServletAsyncProcessor.process(fileState, process.getFileId(), process.getCrc(), process.getInputStream(),
new WriteChunkCompletionListener() {
@Override
public void success() {
asyncContext.complete();
}
@Override
public void error(Exception exception) {
// handles a stream ended unexpectedly , it just means the user has
// stopped the
// stream
if (exception.getMessage() != null) {
if (exception.getMessage().equals("Stream ended unexpectedly")) {
log.warn("User has stopped streaming for file " + process.getFileId());
}
else if (exception.getMessage().equals("User cancellation")) {
log.warn("User has cancelled streaming for file id " + process.getFileId());
// do nothing
}
else {
exceptionCodeMappingHelper.processException(exception, response);
}
}
else {
exceptionCodeMappingHelper.processException(exception, response);
}
asyncContext.complete();
}
});
}
catch (Exception e) {
exceptionCodeMappingHelper.processException(e, response);
}
}
}
3,请求流程图:
主要思路就是将文件切分,然后分块上传。
详细代码可以参照我写的这篇文章:http://t.cn/AiHwnJaB
jsp上传超大文件解决方案的更多相关文章
- js上传超大文件解决方案
需求: 支持大文件批量上传(20G)和下载,同时需要保证上传期间用户电脑不出现卡死等体验: 内网百兆网络上传速度为12MB/S 服务器内存占用低 支持文件夹上传,文件夹中的文件数量达到1万个以上,且包 ...
- Web上传超大文件解决方案
文件上传下载,与传统的方式不同,这里能够上传和下载10G以上的文件.而且支持断点续传. 通常情况下,我们在网站上面下载的时候都是单个文件下载,但是在实际的业务场景中,我们经常会遇到客户需要批量下载的场 ...
- B/S上传超大文件解决方案
4GB以上超大文件上传和断点续传服务器的实现 随着视频网站和大数据应用的普及,特别是高清视频和4K视频应用的到来,超大文件上传已经成为了日常的基础应用需求. 但是在很多情况下,平台运营方并没有大文件上 ...
- java上传超大文件解决方案
用JAVA实现大文件上传及显示进度信息 ---解析HTTP MultiPart协议 (本文提供全部源码下载,请访问 https://github.com/1269085759/up6-jsp-mysq ...
- .net上传超大文件解决方案
HTML部分 <%@PageLanguage="C#"AutoEventWireup="true"CodeBehind="index.aspx. ...
- PHP上传超大文件解决方案
一提到大文件上传,首先想到的是啥??? 没错,就是修改php.ini文件里的上传限制,那就是upload_max_filesize.修改成合适参数我们就可以进行愉快的上传文件了.当然啦,这是一般情况下 ...
- HTML5上传超大文件解决方案
一.概述 所谓断点续传,其实只是指下载,也就是要从文件已经下载的地方开始继续下载.在以前版本的HTTP协议是不支持断点的,HTTP/1.1开始就支持了.一般断点下载时才用到Range和Content- ...
- Flash上传超大文件解决方案
文件夹数据库处理逻辑 public class DbFolder { JSONObject root; public DbFolder() { this.root = new JSONObject() ...
- asp.net上传超大文件解决方案
ASP.NET上传文件用FileUpLoad就可以,但是对文件夹的操作却不能用FileUpLoad来实现. 下面这个示例便是使用ASP.NET来实现上传文件夹并对文件夹进行压缩以及解压. ASP.NE ...
随机推荐
- luogu P3959(2017noipTG D2T2
luogu P3959(2017noipTG D2T2 不知道为什么,这两天见了好多伪装成图的dp题,这道也是. 最短路只有40分,实际上可以从数据范围n<=12看出来是状压dp. soluti ...
- linux 查找大文件
查看磁盘使用情况:df -h [root@iZwz9gs2zseivevv1k5vnkZ /]# df -h Filesystem Size Used Avail Use% Mounted on /d ...
- 【计数dp】Array Without Local Maximums
参考博客:[CF1068D]Array Without Local Maximums(计数DP) [题意] n<=1e5 dp[i][j][k]表示当前第i个数字为j,第i-1个数字与第i个之间 ...
- react中数据持久化缓存redux-persist
一.安装redux-persist: npm install redux-persist --save 二..babelrc中增加redux-persist配置: "plugins" ...
- Struts框架的使用初步
Struts框架的使用初步: A:Apache下载struts.2.1.8.rar包. B:解压空工程,进入apps目录. C:将struts2的基本jar包拷到工程的lib目录中. D:配置web. ...
- O050、Create Volume 操作 (Part I)
参考https://www.cnblogs.com/CloudMan6/p/5603312.html 前面已经学习了Cinder的架构和相关组件,从本节开始详细分析 Cinder 的各种操作,首先 ...
- java代码实现图片内容转文字
前言 现在的手机已经可以实现拍照转文字了.作为一名程序员,得使用java代码实现这一功能,虽然可能没啥用!!! pom.xml 添加依赖 <dependency> <groupId& ...
- CSS3总结五:弹性盒子(flex)、弹性盒子布局
弹性盒子容器的属性与应用 display:flex/inline-flex flex-direction flex-wrap justify-content align-items align-con ...
- java.sql.SQLException: Could not retrieve transaction read-only status from server 问题解决
网上有2种主要说法 第一种 问题描述: java代码在开始事务后,先做了一个查询,再insert,此时会报: java.sql.SQLException: could not ret ...
- 3 java 笔记
1 垃圾回收机制能够很好地提高编程效率 2 垃圾回机制保护程序的完成性 3 面向对象的三种基本特征:继承,封装,多态 4 面向对象的方式:OOA(面向对象的分析),OOD(面向对象的设计)和OOP(面 ...