servlet-大神幫看下這段代碼我想把文件上傳到webroot下的upload文件夾該怎麼改啊

大神幫看下這段代碼我想把文件上傳到webroot下的upload文件夾該怎麼改啊

package com.chamber.controller.upload;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class ProgressUploadServlet extends HttpServlet {

private static final long serialVersionUID = -4935921396709035718L;

public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    // 上傳狀態
    UploadStatus status = new UploadStatus();

    // 監聽器
    UploadListener listener = new UploadListener(status);

    // 把 UploadStatus 放到 session 裡
    request.getSession(true).setAttribute("uploadStatus", status);

    // Apache 上傳工具
    ServletFileUpload upload = new ServletFileUpload(
            new DiskFileItemFactory());

    // 設置 listener
    upload.setProgressListener(listener);

    try {
        List itemList = upload.parseRequest(request);

        for (Iterator it = itemList.iterator(); it.hasNext();) {
            FileItem item = (FileItem) it.next();
            if (item.isFormField()) {
                System.out.println("FormField: " + item.getFieldName()
                        + " = " + item.getString());
            } else {
                System.out.println("File: " + item.getName());

                // 統一 Linux 與 windows 的路徑分隔符
                String fileName = item.getName().replace("/", "\\");
                fileName = fileName.substring(fileName.lastIndexOf("\\"));

                File saved = new File("C:\\upload_test", fileName);
                saved.getParentFile().mkdirs();

                InputStream ins = item.getInputStream();
                OutputStream ous = new FileOutputStream(saved);

                byte[] tmp = new byte[1024];
                int len = -1;

                while ((len = ins.read(tmp)) != -1) {
                    ous.write(tmp, 0, len);
                }

                ous.close();
                ins.close();

                response.getWriter().println("已保存文件：" + saved);
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
        response.getWriter().println("上傳發生錯誤：" + e.getMessage());
    }
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {

    response.setHeader("Cache-Control", "no-store");
    response.setHeader("Pragrma", "no-cache");
    response.setDateHeader("Expires", 0);

    UploadStatus status = (UploadStatus) request.getSession(true)
            .getAttribute("uploadStatus");

    if (status == null) {
        response.getWriter().println("沒有上傳信息");
        return;
    }

    long startTime = status.getStartTime();
    long currentTime = System.currentTimeMillis();

    // 已傳輸的時間 單位：s
    long time = (currentTime - startTime) / 1000 + 1;

    // 傳輸速度 單位：byte/s
    double velocity = ((double) status.getBytesRead()) / (double) time;

    // 估計總時間 單位：s
    double totalTime = status.getContentLength() / velocity;

    // 估計剩余時間 單位：s
    double timeLeft = totalTime - time;

    // 已完成的百分比
    int percent = (int) (100 * (double) status.getBytesRead() / (double) status
            .getContentLength());

    // 已完成數 單位：M
    double length = ((double) status.getBytesRead()) / 1024 / 1024;

    // 總長度 單位：M
    double totalLength = ((double) status.getContentLength()) / 1024 / 1024;

    // 格式：百分比||已完成數(M)||文件總長度(M)||傳輸速率(K)||已用時間(s)||估計總時間(s)||估計剩余時間(s)||正在上傳第幾個文件
    String value = percent + "||" + length + "||" + totalLength + "||"
            + velocity + "||" + time + "||" + totalTime + "||" + timeLeft
            + "||" + status.getItems();

    response.getWriter().println(value);
}

}

最佳回答：

修正文件保存文件的路徑，參考代碼如下：

 String filePath = getServletContext().getRealPath("/");
 filePath +="upload"
 File saved = new File(filePath, fileName);