package com.test.servlet;

import java.io.File;
import java.io.IOException;
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 UploadServlet extends HttpServlet {

    @Override
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        // super.doPost(arg0, arg1);
        request.setCharacterEncoding("UTF-8");
        DiskFileItemFactory factory = new DiskFileItemFactory();
        String path = request.getSession().getServletContext().getRealPath(
                "/upload");
        factory.setRepository(new File(path));
        factory.setSizeThreshold(1024 * 1024);

        ServletFileUpload upload = new ServletFileUpload(factory);
        try {
            List<FileItem> list = upload.parseRequest(request);

            for (FileItem item : list) {
                if (item.isFormField()) {
                    String name = item.getFieldName();
                    String value = item.getString("UTF-8");
                    request.setAttribute(name, value);
                } else {
                    String name = item.getFieldName();
                    String value = item.getName();
                    int start = value.lastIndexOf("\\");
                    String fileName = value.substring(start + 1);
                    request.setAttribute(name, fileName);

                    item.write(new File(path, fileName));
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        request.getRequestDispatcher("/result.jsp").forward(request, response);
    }

}

java.io.FileNotFoundException: D:\apache-tomcat-6.0.29\webapps\FileUpload\upload (拒绝访问。)
    at java.io.FileOutputStream.open(Native Method)
    at java.io.FileOutputStream.<init>(Unknown Source)
    at java.io.FileOutputStream.<init>(Unknown Source)
    at org.apache.commons.fileupload.disk.DiskFileItem.write(DiskFileItem.java:416)
    at com.test.servlet.UploadServlet.doPost(UploadServlet.java:47)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:298)
    at org.apache.coyote.http11.Http11AprProcessor.process(Http11AprProcessor.java:861)
    at org.apache.coyote.http11.Http11AprProtocol$Http11ConnectionHandler.process(Http11AprProtocol.java:579)
    at org.apache.tomcat.util.net.AprEndpoint$Worker.run(AprEndpoint.java:1584)
    at java.lang.Thread.run(Unknown Source)