如何做上传进度?
由于经常用户上传的时候处于提示：上传中，问加你稍大会员就以为卡住了，请问如何做一个上传进度来显示状态呢？求解！在线等。
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回 5楼(ap6214f2r) 的帖子我也好奇，表示为上传过中，客户端浏览器显示的上传进度。（使用AJAX来上传，同时显示进度的除外）2012-08-20 20:54:21赞同 展开评论
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你用的是什么语言开发的?如果是java的话,可以继承一个inputstream在里面实现一些和进度相关的处理,然后将该inputstream传给putObject就可以实现了,下面是简单的代码示例:
public class ProgressReportingInputStream extends FilterInputStream {
private static final int NOTIFICATION_THRESHOLD = 8 * Constants.KB;
private final ProgressListener listener;
private int unnotifiedByteCount;
public ProgressReportingInputStream(final InputStream in, final ProgressListener listener) {
super(in);
this.listener = listener;
}
@Override
public int read() throws IOException {
int data = super.read();
if (data != -1) notify(1);
return data;
}
@Override
public int read(byte[] b, int off, int len) throws IOException {
int bytesRead = super.read(b, off, len);
if (bytesRead != -1) notify(bytesRead);
return bytesRead;
}
@Override
public void close() throws IOException {
if (unnotifiedByteCount > 0) {
listener.progressChanged(new ProgressEvent(unnotifiedByteCount));
unnotifiedByteCount = 0;
}
super.close();
}
private void notify(int bytesRead) {
unnotifiedByteCount = bytesRead;
if (unnotifiedByteCount >= NOTIFICATION_THRESHOLD) {
listener.progressChanged(new ProgressEvent(unnotifiedByteCount));
unnotifiedByteCount = 0;
}
}
}public interface ProgressListener {
public void progressChanged(ProgressEvent progressEvent);
}
public class ProgressEvent {
public static final int DEFAULT_EVENT_CODE = 0;
public static final int STARTED_EVENT_CODE = 1;
public static final int COMPLETED_EVENT_CODE = 2;
public static final int FAILED_EVENT_CODE = 4;
public static final int CANCELED_EVENT_CODE = 8;
private int bytesTransfered;
private int eventCode;
public ProgressEvent(int bytesTransfered) {
this.bytesTransfered = bytesTransfered;
}
public void setBytesTransfered(int bytesTransfered) {
this.bytesTransfered = bytesTransfered;
}
public int getBytesTransfered() {
return bytesTransfered;
}
public int getEventCode() {
return eventCode;
}
public void setEventCode(int eventType) {
this.eventCode = eventType;
}
}public class ProgressListenerImp implements ProgressListener {
private final int SPEED_UPADATE_INTERVAL = 300;
private IconTableModel iconTableModel;
private String taskName;
private long totalSize = 0;
private long curSize = 0;
private long newUploadSize = 0;
private long lastTime = 0;
private String taskType;
private boolean isFailed = false;
@Override
public void progressChanged(ProgressEvent progressEvent) {
switch (progressEvent.getEventCode()) {
case ProgressEvent.DEFAULT_EVENT_CODE:
int ratio = -1,
speed = -1;
long curTime = new Date().getTime();
curSize = progressEvent.getBytesTransfered();
newUploadSize = progressEvent.getBytesTransfered();
if (totalSize > 0) {
ratio = (int) (curSize * 100 / totalSize);
}
if (curTime - lastTime > SPEED_UPADATE_INTERVAL) {
speed = (int) (newUploadSize * 1000 / (curTime - lastTime));
lastTime = curTime;
newUploadSize = 0;
}
if (!isFailed) {
iconTableModel.setValueAt(taskName, ratio, taskType, speed);
}
break;
case ProgressEvent.STARTED_EVENT_CODE:
iconTableModel.setValueAt(taskName, 0, taskType, 0);
lastTime = new Date().getTime();
break;
case ProgressEvent.COMPLETED_EVENT_CODE:
iconTableModel.setValueAt(taskName, 100, "Completed", 0);
iconTableModel.removeTask(taskName);
break;
case ProgressEvent.CANCELED_EVENT_CODE:
iconTableModel.setValueAt(taskName, -1, "Canceled", 0);
break;
case ProgressEvent.FAILED_EVENT_CODE:
isFailed = true;
iconTableModel.setValueAt(taskName, -1, "Failed", 0);
break;
}
}
public ProgressListenerImp(ResourceManager resourceManager,
IconTableModel iconTableModel, String taskName, long totalSize,
int taskType) {
super();
this.iconTableModel = iconTableModel;
this.taskName = taskName;
this.totalSize = totalSize;
if (taskType == Utils.CREATE_FOLDER
|| taskType == Utils.UPLOAD_FILE) {
this.taskType = "Uploading";
} else {
this.taskType = "Downloading";
}
}
}
2012-03-29 11:33:50赞同 展开评论
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