清单 2. 检索文件上载过程的文件上载侦听器

package uk.ac.dl.esc.gtg.myportlets.fileupload;
import java.text.NumberFormat;
import org.apache.commons.fileupload.ProgressListener;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class FileUploadProgressListener implements ProgressListener {
private static Log log = LogFactory.getLog(FileUploadProgressListener.class);
private static long bytesTransferred = 0;
private static long fileSize = -100;
private long tenKBRead = -1;
public FileUploadProgressListener() {
}
public String getFileUploadStatus() {
// per looks like 0% - 100%, remove % before submission
String per = NumberFormat.getPercentInstance().format(
(double) bytesTransferred / (double) fileSize);
return per.substring(0, per.length() - 1);
}
public void update(long bytesRead, long contentLength, int items) {
// update bytesTransferred and fileSize (if required) every 10 KB is
// read
long tenKB = bytesRead / 10240;
if (tenKBRead == tenKB)
return;
tenKBRead = tenKB;
bytesTransferred = bytesRead;
if (fileSize != contentLength)
fileSize = contentLength;
}
}

(编辑:aniston)