2018-03-09 修改
js其实是单线程的程序，因此在调用计时器的时候会先把setInterval或者settimeout函数之外的代码全部执行完才开始进入计时器程序…..好吧，这些是经典的面试题….
啰嗦两句：显示进度条其实没那么困难
有时候，不知道是环境问题还是人品问题，遇到的bug总是莫名其妙的。可是说到底还是某个知识点不太熟练。这次吐槽一下前端jquery的submit方法。下午的时候测试提交能顺利完成任务，可是到了十一点多的时候就不行了。我知道，程序员十大谎言之一就是：我真的没改这部分代码。好吧，既然不太清除bug到底是怎么出现的，那么就换一种提交方法吧。
所以直接把button类型改成submit，再设置它的click事件，让表单自己提交好了。知识点的盲区就在这时候出现了。由于要轮询后台文件的上传进度信息，不得不一边提交file一遍ajax获取进度。实在是不太清楚setinterval这个方法是异步还是同步，会不会阻塞submit（又和上一段中提到的文件submit不成功混在一起，就测试了好久）。在这个地方也停留了好久。。。
最后，项目还残存的问题就是：明明是每隔500ms向后台请求的进度信息，但是实际上后台并不能够在这段时间内返回对应的信息。亟待优化！
效果图如下：
获取文件上传信息的基本步骤：经测试有效
上传文件时如何获取上传进度信息？
从网上查一下资料就可以知道struts2对文件上传的request请求做了封装，也就是说在调用上传文件的action时就已经上传temp完成了。
那么既然这样，我们就可以重写struts2封装request的类：org.apache.struts2.dispatcher.multipart.JakartaMultiPartRequest;
由于这个类的许多方法都是private的，那么也就是说我们是无法通过extends来重写父类的一些方法的。怎么办呢？
暴力一点！
直接自定义一个JakartaMultiPartRequest类型的类，把父类的方法全部copy过来，然后在struts.xml中配置：
<struts>
<bean type="org.apache.struts2.dispatcher.multipart.MultiPartRequest"
name="myRequestParser" class="listener.MultiPartRequest"
scope="default" optional="true" />
<!-- 注意struts2.3.15.1以前版本这里为struts.multipart.handler， struts2.3.15.1（包含2.3.15.1）这里为struts.multipart.parser-->
<constant name="struts.multipart.handler" value="myRequestParser"/>
<!--action-->
....
</struts>
接下来我们实现上述配置文件中的MultiPartRequest类：
通过intellij的反编译插件，我们decode JakartaMultiPartRequest这个类：源码如下—-大量代码来袭，直接copy这部分吧 不用细看
/*
* $Id: JakartaMultiPartRequest.java 1384107 2012-09-12 20:14:23Z lukaszlenart $
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.struts2.dispatcher.multipart;
import com.opensymphony.xwork2.LocaleProvider;
import com.opensymphony.xwork2.inject.Inject;
import com.opensymphony.xwork2.util.LocalizedTextUtil;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadBase;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.RequestContext;
import org.apache.commons.fileupload.disk.DiskFileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.struts2.StrutsConstants;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
/**
* Multipart form data request adapter for Jakarta Commons Fileupload package.
*/
public class JakartaMultiPartRequest implements MultiPartRequest {
static final Logger LOG = LoggerFactory.getLogger(JakartaMultiPartRequest.class);
// maps parameter name -> List of FileItem objects
protected Map<String, List<FileItem>> files = new HashMap<String, List<FileItem>>();
// maps parameter name -> List of param values
protected Map<String, List<String>> params = new HashMap<String, List<String>>();
// any errors while processing this request
protected List<String> errors = new ArrayList<String>();
protected long maxSize;
private Locale defaultLocale = Locale.ENGLISH;
@Inject(StrutsConstants.STRUTS_MULTIPART_MAXSIZE)
public void setMaxSize(String maxSize) {
this.maxSize = Long.parseLong(maxSize);
}
@Inject
public void setLocaleProvider(LocaleProvider provider) {
defaultLocale = provider.getLocale();
}
/**
* Creates a new request wrapper to handle multi-part data using methods adapted from Jason Pell's
* multipart classes (see class description).
*
* @param saveDir the directory to save off the file
* @param request the request containing the multipart
* @throws java.io.IOException is thrown if encoding fails.
*/
public void parse(HttpServletRequest request, String saveDir) throws IOException {
try {
setLocale(request);
processUpload(request, saveDir);
} catch (FileUploadBase.SizeLimitExceededException e) {
if (LOG.isWarnEnabled()) {
LOG.warn("Request exceeded size limit!", e);
}
String errorMessage = buildErrorMessage(e, new Object[]{e.getPermittedSize(), e.getActualSize()});
if (!errors.contains(errorMessage)) {
errors.add(errorMessage);
}
} catch (Exception e) {
if (LOG.isWarnEnabled()) {
LOG.warn("Unable to parse request", e);
}
String errorMessage = buildErrorMessage(e, new Object[]{});
if (!errors.contains(errorMessage)) {
errors.add(errorMessage);
}
}
}
protected void setLocale(HttpServletRequest request) {
if (defaultLocale == null) {
defaultLocale = request.getLocale();
}
}
protected String buildErrorMessage(Throwable e, Object[] args) {
String errorKey = "struts.messages.upload.error." + e.getClass().getSimpleName();
if (LOG.isDebugEnabled()) {
LOG.debug("Preparing error message for key: [#0]", errorKey);
}
return LocalizedTextUtil.findText(this.getClass(), errorKey, defaultLocale, e.getMessage(), args);
}
private void processUpload(HttpServletRequest request, String saveDir) throws FileUploadException, UnsupportedEncodingException {
for (FileItem item : parseRequest(request, saveDir)) {
if (LOG.isDebugEnabled()) {
LOG.debug("Found item " + item.getFieldName());
}
if (item.isFormField()) {
processNormalFormField(item, request.getCharacterEncoding());
} else {
processFileField(item);
}
}
}
private void processFileField(FileItem item) {
if (LOG.isDebugEnabled()) {
LOG.debug("Item is a file upload");
}
// Skip file uploads that don't have a file name - meaning that no file was selected.
if (item.getName() == null || item.getName().trim().length() < ) {
LOG.debug("No file has been uploaded for the field: " + item.getFieldName());
return;
}
List<FileItem> values;
if (files.get(item.getFieldName()) != null) {
values = files.get(item.getFieldName());
} else {
values = new ArrayList<FileItem>();
}
values.add(item);
files.put(item.getFieldName(), values);
}
private void processNormalFormField(FileItem item, String charset) throws UnsupportedEncodingException {
if (LOG.isDebugEnabled()) {
LOG.debug("Item is a normal form field");
}
List<String> values;
if (params.get(item.getFieldName()) != null) {
values = params.get(item.getFieldName());
} else {
values = new ArrayList<String>();
}
// note: see http://jira.opensymphony.com/browse/WW-633
// basically, in some cases the charset may be null, so
// we're just going to try to "other" method (no idea if this
// will work)
if (charset != null) {
values.add(item.getString(charset));
} else {
values.add(item.getString());
}
params.put(item.getFieldName(), values);
item.delete();
}
private List<FileItem> parseRequest(HttpServletRequest servletRequest, String saveDir) throws FileUploadException {
DiskFileItemFactory fac = createDiskFileItemFactory(saveDir);
ServletFileUpload upload = new ServletFileUpload(fac);
upload.setSizeMax(maxSize);
return upload.parseRequest(createRequestContext(servletRequest));
}
private DiskFileItemFactory createDiskFileItemFactory(String saveDir) {
DiskFileItemFactory fac = new DiskFileItemFactory();
// Make sure that the data is written to file
fac.setSizeThreshold();
if (saveDir != null) {
fac.setRepository(new File(saveDir));
}
return fac;
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.multipart.MultiPartRequest#getFileParameterNames()
*/
public Enumeration<String> getFileParameterNames() {
return Collections.enumeration(files.keySet());
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.multipart.MultiPartRequest#getContentType(java.lang.String)
*/
public String[] getContentType(String fieldName) {
List<FileItem> items = files.get(fieldName);
if (items == null) {
return null;
}
List<String> contentTypes = new ArrayList<String>(items.size());
for (FileItem fileItem : items) {
contentTypes.add(fileItem.getContentType());
}
return contentTypes.toArray(new String[contentTypes.size()]);
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.multipart.MultiPartRequest#getFile(java.lang.String)
*/
public File[] getFile(String fieldName) {
List<FileItem> items = files.get(fieldName);
if (items == null) {
return null;
}
List<File> fileList = new ArrayList<File>(items.size());
for (FileItem fileItem : items) {
File storeLocation = ((DiskFileItem) fileItem).getStoreLocation();
if (fileItem.isInMemory() && storeLocation != null && !storeLocation.exists()) {
try {
storeLocation.createNewFile();
} catch (IOException e) {
if (LOG.isErrorEnabled()) {
LOG.error("Cannot write uploaded empty file to disk: " + storeLocation.getAbsolutePath(), e);
}
}
}
fileList.add(storeLocation);
}
return fileList.toArray(new File[fileList.size()]);
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.multipart.MultiPartRequest#getFileNames(java.lang.String)
*/
public String[] getFileNames(String fieldName) {
List<FileItem> items = files.get(fieldName);
if (items == null) {
return null;
}
List<String> fileNames = new ArrayList<String>(items.size());
for (FileItem fileItem : items) {
fileNames.add(getCanonicalName(fileItem.getName()));
}
return fileNames.toArray(new String[fileNames.size()]);
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.multipart.MultiPartRequest#getFilesystemName(java.lang.String)
*/
public String[] getFilesystemName(String fieldName) {
List<FileItem> items = files.get(fieldName);
if (items == null) {
return null;
}
List<String> fileNames = new ArrayList<String>(items.size());
for (FileItem fileItem : items) {
fileNames.add(((DiskFileItem) fileItem).getStoreLocation().getName());
}
return fileNames.toArray(new String[fileNames.size()]);
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.multipart.MultiPartRequest#getParameter(java.lang.String)
*/
public String getParameter(String name) {
List<String> v = params.get(name);
if (v != null && v.size() > ) {
return v.get();
}
return null;
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.multipart.MultiPartRequest#getParameterNames()
*/
public Enumeration<String> getParameterNames() {
return Collections.enumeration(params.keySet());
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.multipart.MultiPartRequest#getParameterValues(java.lang.String)
*/
public String[] getParameterValues(String name) {
List<String> v = params.get(name);
if (v != null && v.size() > ) {
return v.toArray(new String[v.size()]);
}
return null;
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.multipart.MultiPartRequest#getErrors()
*/
public List<String> getErrors() {
return errors;
}
/**
* Returns the canonical name of the given file.
*
* @param filename the given file
* @return the canonical name of the given file
*/
private String getCanonicalName(String filename) {
int forwardSlash = filename.lastIndexOf("/");
int backwardSlash = filename.lastIndexOf("\\");
if (forwardSlash != - && forwardSlash > backwardSlash) {
filename = filename.substring(forwardSlash + , filename.length());
} else if (backwardSlash != - && backwardSlash >= forwardSlash) {
filename = filename.substring(backwardSlash + , filename.length());
}
return filename;
}
/**
* Creates a RequestContext needed by Jakarta Commons Upload.
*
* @param req the request.
* @return a new request context.
*/
private RequestContext createRequestContext(final HttpServletRequest req) {
return new RequestContext() {
public String getCharacterEncoding() {
return req.getCharacterEncoding();
}
public String getContentType() {
return req.getContentType();
}
public int getContentLength() {
return req.getContentLength();
}
public InputStream getInputStream() throws IOException {
InputStream in = req.getInputStream();
if (in == null) {
throw new IOException("Missing content in the request");
}
return req.getInputStream();
}
};
}
/* (non-Javadoc)
* @see org.apache.struts2.dispatcher.multipart.MultiPartRequest#cleanUp()
*/
public void cleanUp() {
Set<String> names = files.keySet();
for (String name : names) {
List<FileItem> items = files.get(name);
for (FileItem item : items) {
if (LOG.isDebugEnabled()) {
String msg = LocalizedTextUtil.findText(this.getClass(), "struts.messages.removing.file",
Locale.ENGLISH, "no.message.found", new Object[]{name, item});
LOG.debug(msg);
}
if (!item.isInMemory()) {
item.delete();
}
}
}
}
}
好的，我们把上面这部分代码copy到我们自定义的public class MultiPartRequest extends JakartaMultiPartRequest {}中
复制粘贴完了之后，我们要ctrl f找到parseRequest方法。在这里，我们要设置文件上传进度监听器
/**
* 自定义的parseRequest方法
* @param servletRequest
* @param saveDir
* @return
* @throws FileUploadException
*/
private List<FileItem> parseRequest(HttpServletRequest servletRequest, String saveDir) throws FileUploadException {
System.out.println("调用parseRequest方法");
UploadProgressListener listener = new UploadProgressListener(servletRequest);
DiskFileItemFactory fac = createDiskFileItemFactory(saveDir);
ServletFileUpload upload = new ServletFileUpload(fac);
upload.setSizeMax(maxSize);
upload.setProgressListener(listener);
System.out.println("设置监听器成功");
return upload.parseRequest(createRequestContext(servletRequest));
}
在上面这个代码片段中可以看到：我们new了一个监听器UploadProgressListener 的实例，然后调用了ServletFileUpload .setProgressListener（listener）方法。也就是说：这里的监听器与我们以前写过的request,session等等监听器不同，不需要在web.xml中配置。这里只需要一行代码即可解决。
那么我们就来实现这个监听器吧！
这个监听器需要实org.apache.commons.fileupload.ProgressListener这个接口：我们直接implement一下。
在update方法中我们可以获取到已上传的文件长度，上传的文件的总长度，当前上传第几个文件。（当你上传一个文件的时候，打印日志就会发现这里会输出2。个人猜测是先上传到temp然后再上传到指定路径…）
我们在update方法中设置了文件上传状态实体类的实例，并且保存到session。这一步就是能让前端使用ajax访问到文件当前的上传进度信息。
package listener;
import entity.FileUploadProgress;
import org.apache.commons.fileupload.ProgressListener;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
/**
* Created by zipple on 2017/10/13.
* 监听文件上传情况
* 实现org.apache.commons.fileupload.ProgressListener接口
*/
public class UploadProgressListener implements ProgressListener {
private HttpSession session;//创建监听器实例的时候获取session
//在自定义的MultiPartRequest 类中 创建此监听器的实例
public UploadProgressListener(HttpServletRequest request) {
session = request.getSession();
FileUploadProgress fileUploadProgress = new FileUploadProgress();
fileUploadProgress.setFlag(false);
session.setAttribute("fileUploadProgress", fileUploadProgress);
}
@Override
public void update(long readBytes, long totalBytes, int currentItem) {
//实现文件上传的核心方法
Object attribute = session.getAttribute("fileUploadProgress");
// System.out.println("当前已读取:"+readBytes+" 总长度:"+totalBytes+" 正在保存:"+currentItem);
FileUploadProgress fileUploadProgress;
if(null == attribute){
fileUploadProgress = new FileUploadProgress();
fileUploadProgress.setFlag(false);
System.out.println("uploadListener文件上传的开始时间："+fileUploadProgress.getStartTime());
session.setAttribute("fileUploadProgress", fileUploadProgress);
}else{
fileUploadProgress = (FileUploadProgress)attribute;
}
fileUploadProgress.setCurrentLength(readBytes);
fileUploadProgress.setTotalLength(totalBytes);
if(readBytes==totalBytes){
fileUploadProgress.setFlag(true);
}else{
fileUploadProgress.setFlag(false);
}
session.setAttribute("fileUploadProgress", fileUploadProgress);
}
}
文件上传状态实体类代码：
package entity;
/**
* Created by zipple on 2017/10/14.
* 上传文件进度信息实体类
*/
public class FileUploadProgress {
private long startTime = System.currentTimeMillis();//开始时间
private long totalLength=;//文件上传的总长度
private long currentLength=;//当前文件上传的长度
private boolean flag;//是否上传完成
public long getTotalLength() {
return totalLength;
}
public void setTotalLength(long totalLength) {
this.totalLength = totalLength;
}
public long getCurrentLength() {
return currentLength;
}
public void setCurrentLength(long currentLength) {
this.currentLength = currentLength;
}
public boolean isFlag() {
return flag;
}
public void setFlag(boolean flag) {
this.flag = flag;
}
public long getStartTime() {
return startTime;
}
public void setStartTime(long startTime) {
this.startTime = startTime;
}
public FileUploadProgress(){
super();
}
}
前端获取后台文件上传的进度信息
好的，前面已经做完了所有的基本工作了。万事俱备，我们最后只需要实现对应的查询action即可。在这个地方我也要记录一个bug。在使用ajax访问这个action的时候，一直报错。当然，我在前面的博客中也吐槽过了，这个报错信息一点用没有。我又找了好久。后来发现jsonData只是单纯的定义了map对象，并没有new出它的实例，所以空指针异常了！！！
这里我们使用的是返回json数据。（需要struts2-json-plugin-2.3.16.jar）
package action;
import com.opensymphony.xwork2.Action;
import entity.FileUploadProgress;
import org.apache.struts2.ServletActionContext;
import util.DataUtil;
import java.util.HashMap;
import java.util.Map;
/**
* Created by zipple on 2017/10/15.
* 获取文件进度信息
*/
public class ProgressAction implements Action {
private Map<String,Object> jsonData;
@Override
public String execute() throws Exception {
System.out.println("获取上传文件进度信息");
jsonData = new HashMap<>();//初始化jsonData!!!!
FileUploadProgress p;
Object attribute = ServletActionContext.getRequest().getSession().getAttribute("fileUploadProgress");
if(null == attribute){
System.out.println("session中没有fileupload信息");
jsonData.put("completed", false);
jsonData.put("isStarted", false);
setJsonData(jsonData);
return SUCCESS;
}else{
System.out.println("session中有fileupload信息");
p = (FileUploadProgress)attribute;
}
System.out.println("action中获取到的文件上传的开始时间："+p.getStartTime());
System.out.println("action运行到这里的时间:"+System.currentTimeMillis());
long time = (System.currentTimeMillis() - p.getStartTime())/ + ; //已传输的时间 单位:s
System.out.println("截至目前上传时间："+time);
double v = ((double)p.getCurrentLength()) / (double)time; // b/s
System.out.println("传输速度："+v);
System.out.println("pAction:当前上传--"+p.getCurrentLength());
jsonData.put("percent", DataUtil.percent(p.getCurrentLength(),p.getTotalLength()));
jsonData.put("remain", (int)(p.getTotalLength()/v-time));
jsonData.put("isStarted", true);
jsonData.put("completed", p.isFlag());
if (p.isFlag()){
System.out.println("已完成，重置fileUploadProgress");
ServletActionContext.getRequest().getSession().removeAttribute("fileUploadProgress");
}
setJsonData(jsonData);
return SUCCESS;
}
public Map<String,Object> getJsonData() {
return jsonData;
}
public void setJsonData(Map<String,Object> jsonData) {
this.jsonData = jsonData;
}
}
返回json数据的struts.xml配置如下:
<package name="json" extends="struts-default,json-default">
<action name="getProgress" class="action.ProgressAction" method="execute">
<result name="success" type="json">
<param name="root">jsonData</param><!-- action中的要返回的属性 -->
</result>
</action>
</package>
项目做到这里，后端的事情已经做完了。接下来就是前端显示进度条的事情。需要的同学可以继续往下看咯。
前端那些事儿——css实现进度条控件
css:可以直接copy，无需细看（firefox下测试无问题）
.progress{
height: px;
background: #ebebeb;
border-left: px solid transparent;
border-right: px solid transparent;
border-radius: px;
}
.progress .blue {
background: #5aaadb;
border-color: #459fd6 #3094d2 #277db2;
background-image: -webkit-linear-gradient(top, #aed5ed %, #bbbe2 %, #aaadb %);
background-image: -moz-linear-gradient(top, #aed5ed %, #bbbe2 %, #aaadb %);
background-image: -o-linear-gradient(top, #aed5ed %, #bbbe2 %, #aaadb %);
background-image: linear-gradient(to bottom, #aed5ed %, #bbbe2 %, #aaadb %);
}
.progress > span {
position: relative;
float: left;
margin: -px;
min-width: px;
height: px;
line-height: px;
text-align: right;
background: #cccccc;
border: px solid;
border-color: #bfbfbf #b3b3b3 #9e9e9e;
border-radius: px;
background-image: -webkit-linear-gradient(top, #f0f0f0 %, #dbdbdb %, #cccccc %);
background-image: -moz-linear-gradient(top, #f0f0f0 %, #dbdbdb %, #cccccc %);
background-image: -o-linear-gradient(top, #f0f0f0 %, #dbdbdb %, #cccccc %);
background-image: linear-gradient(to bottom, #f0f0f0 %, #dbdbdb %, #cccccc %);
-webkit-box-shadow: inset px rgba(, , , ), px px rgba(, , , );
box-shadow: inset px rgba(, , , ), px px rgba(, , , );
}
.progress > span > span {
padding: px;
font-size: px;
font-weight: bold;
color: #404040;
color: rgba(, , , );
text-shadow: px rgba(, , , );
}
.progress > span:before {
content: '';
position: absolute;
top: ;
bottom: ;
left: ;
right: ;
z-index: ;
height: px;
background: url("http://js.itivy.com/5-progress-bars/img/progress.png") repeat-x;
border-radius: px;
}
html调用progress代码很简单，就一行：这里设置隐藏，上传文件时再显示
控制进度条代码：在提交文件时同步调用此计时器即可。
setInterval(progressBar,);
/**
* 展示上传进度条
*/
function progressBar () {
console.log("询问后台进度...");
$.ajax({
type : "GET", //提交方式
url : "getProgress.action",//路径
success : function(result) {//返回数据根据结果进行相应的处理
console.log(result);
console.log("文件是否上传完成"+result.completed);
if (result.isStarted){
if (result.completed){
$(".progress").hide();
clearInterval(progressBar);//清除计时器
}else{
$(".progress >span").css({"width":result.percent});
$(".progress >span>span").text(result.percent);
$(".remain").text(result.remain);
}
}else{
console.log("文件还没有提交");
}
},
//异常处理
error:function (XMLHttpRequest, textStatus, errorThrown) {
console.log(XMLHttpRequest+"---"+textStatus+"---"+errorThrown);
}
});
}
看到这里，上传文件显示进度条的相关内容基本上是结束了。
有问题的，可以留言交流~
生活有许多的不如意，如果一不开心，就寄希望于“如果当初”，那你永远都不会开心。
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