Servlet 文件上传

package com;

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

public class FileUpload extends HttpServlet{

	private static final long serialVersionUID = 1L;

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		req.setCharacterEncoding("utf-8");//解决文件名乱码问题

		DiskFileItemFactory factory = new DiskFileItemFactory();
	
		String path = this.getServletContext().getRealPath("upload/");
		System.out.println(path);
  
		factory.setRepository(new File(path));
        factory.setSizeThreshold(1024*1024);
        ServletFileUpload upload = new ServletFileUpload(factory);
//      upload.setHeaderEncoding("UTF-8");
        try {
			List<FileItem> fileList = upload.parseRequest(req);
			for(FileItem item:fileList){
				if(item!=null){
					try {
						item.write(new File(path+"/"+item.getName()));
					} catch (Exception e) {
						e.printStackTrace();
					}
				}
			}
		} catch (FileUploadException e) {
			e.printStackTrace();
		}
	}

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		doPost(req, resp);
	}

	
}