apache fileupload 文件上传，及文件进度设置获取

文件上传action处理：

boolean isMultipart = ServletFileUpload.isMultipartContent(request);
        if (isMultipart) {
            DiskFileItemFactory factory = new DiskFileItemFactory();
            factory.setSizeThreshold(2048);
            // 设置临时文件路径，通过设置临时文件可以在上传大文件时候达到多少先写入临时文件，不会造成卡死情况
            String tempPath = "/mnt/disk1/tomcat/tomcat1/upload/tmp/";
            File tempFile = new File(tempPath);
            if (!tempFile.exists())
                tempFile.mkdirs();
            factory.setRepository(tempFile);
            ServletFileUpload upload = new ServletFileUpload(factory);
　　　　　　　//设置可上传文件大小　
            upload.setSizeMax(1024000000);
　　　　　　　　//设置文件进度监听器
            UploadProgressListener progressListener = new UploadProgressListener();
　　　　　　　　//放入session中，下次访问可以取出，获取文件进度
            session.setAttribute("progress", progressListener);
            upload.setProgressListener(progressListener);
            List<FileItem> fileldItems = null;
            try {
                fileldItems = upload.parseRequest(request);
            } catch (FileUploadException e1) {
                e1.printStackTrace();
            }
            Map<String, String> fieldMap = new HashMap<String, String>();
            List<FileItem> fileList = new ArrayList<FileItem>();
            Iterator<FileItem> iter = fileldItems.iterator();
            StringBuffer url = new StringBuffer("request=");
            url.append(request.getRequestURI());
            while (iter.hasNext()) {
                FileItem item = iter.next();
　　　　　　　　　　//获取非文件字段
                if (item.isFormField()) {
                    String name = item.getFieldName();
                    String value = item.getString();
                    url.append("&" + name + "=" + value);
                    fieldMap.put(name, value);
                } else {
                    fileList.add(item);
                }
            }
　　　　　　//记录非文件字段
            logger.error(url.toString().replaceFirst("&", "?"));
                for (FileItem item : fileList) {
                    String fileName = item.getName();
                    if (fileName == null || fileName.equals(""))
                        continue;
                    fileName = fileName
                            .substring(fileName.lastIndexOf("\\") + 1);
                    String ext = fileName.substring(fileName.lastIndexOf("."));
                    fileName = fileName.substring(0, fileName.lastIndexOf("."));
                    String dateStr = DateUtil.formatDate(new Date(),
                            "yyyyMMddHHmmss");
                    String filename = fileName + "_" + dateStr + ext;
                    String filePath = "";
                    filePath = "/mnt/disk1/tomcat/tomcat1/upload/files/"
                            + DecoderUtil.toChinese(fieldMap.get("user"));
                    File fp = new File(filePath);
                    if (!fp.exists())
                        fp.mkdirs();
                    File uploadedFile = new File(fp, filename);
                    try {
                        item.write(uploadedFile);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
              }

ProgressListener：由于我这个不只记录了文件进度，还有别的信息，懒得删了，就这样黏上来了，可以根据情况自己修改。

package lbi.flow.util;

import java.text.DecimalFormat;

import org.apache.commons.fileupload.ProgressListener;

public class UploadProgressListener implements ProgressListener {
    private long megaBytes = -1;
    private long readBytes = 0;
    private long totalBytes = 0;
    private long processedCount = 0;
    private long totalCount = 0;
    private String speed = "0";// k/s
    private long starttime;
    private int step = 1;

    private final DecimalFormat df = new DecimalFormat("0.##%");
    private final DecimalFormat df2 = new DecimalFormat("0.##");

    public UploadProgressListener() {
        this.starttime = (long) System.currentTimeMillis();
    }

    public String getProgress() {
        if (this.step == 1)
            return df.format(this.readBytes * 1.0 / this.totalBytes);
        else
            return df.format(this.processedCount * 1.0 / this.totalCount);
    }

    public String getOverallProgress() {
        if (this.step == 1)
            return df.format(this.readBytes * 1.0 / this.totalBytes / 3);
        else
            return df.format(this.processedCount * 1.0 / this.totalCount / 3
                    + (this.step - 1) * 1.0 / 3);
    }

    public void update(long pBytesRead, long pContentLength, int pItems) {
        long mBytes = pBytesRead / 1000000;
        if (megaBytes == mBytes && pBytesRead != pContentLength) {
            return;
        }
        megaBytes = mBytes;
        long deadline = System.currentTimeMillis();
        speed = df2.format(pBytesRead / 1024
                / ((deadline - starttime) * 1.0 / 1000));
        readBytes = pBytesRead;
        totalBytes = pContentLength;
    }

    public long getProcessedCount() {
        return processedCount;
    }

    public void setProcessedCount(long processedCount) {
        this.processedCount = processedCount;
    }

    public long getTotalCount() {
        return totalCount;
    }

    public void setTotalCount(long totalCount) {
        this.totalCount = totalCount;
    }

    public int getStep() {
        return step;
    }

    public void setStep(int step) {
        this.step = step;
    }

    public String getSpeed() {
        return this.speed;
    }
}

这样，再写一个接口，通过session获取存储的ProgressListener即可获取上传文件的进度，可以支持多文件上传的。