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-----------------------------jsp页面--------------------------------------------------------------
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>上传文件</title>
</head>
<body>
    <form action="FileUpload" method="post" enctype="MULTIPART/FORM-DATA">
        参数：<input type="text" name="para1" /><br>
        上传文件：<input type="file" name="aa" /><br>
        另选文件：<input type="file" name="bb" /><br>
        再选文件：<input type="file" name="cc" /><br>
        <input type="submit" value="提交" />
    </form>
</body>
</html>
-----------------------------后台serverlet--------------------------------------------------------------
 
package com.cheletong.servlet;
 
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Random;
 
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
 
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;
 
/**
 * Servlet implementation class MaterialManage
 */
 
@WebServlet("/FileUpload")
public class FileUpload extends HttpServlet {
 
    /**
     * 
     */
    private static final long serialVersionUID = 1L;
 
    /**
     * @throws IOException
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doPost(HttpServletRequest request,
            HttpServletResponse response) throws IOException {
        JSONObject resultJson = new JSONObject();
        JSONArray paths = new JSONArray();
        Random ran = new Random();
        int respCode = -1;
        try {
            request.setCharacterEncoding("utf-8");
            response.setContentType("text/html;charset=utf-8");
 
            String uploadPath = getServletContext().getRealPath("/upload");
            System.out.println(uploadPath);
            String tempPath = uploadPath + "\\temp";
            String today = new SimpleDateFormat("yyyyMMdd").format(new Date());
            String todayPath = uploadPath + "\\" + today;
 
            if (uploadPath == null) {
                return;
            }
 
            File uploadDir = new File(uploadPath);
            File tempDir = new File(tempPath);
            File todayDir = new File(todayPath);
 
            if (!uploadDir.exists()) {
                uploadDir.mkdir();
            }
            if (!tempDir.exists()) {
                tempDir.mkdir();
            }
            if (!todayDir.exists()) {
                todayDir.mkdir();
            }
 
            if (!ServletFileUpload.isMultipartContent(request)) {
                return;
            }
 
            DiskFileItemFactory factory = new DiskFileItemFactory();
            factory.setRepository(tempDir);
            factory.setSizeThreshold(1024 * 1024 * 1);
 
            ServletFileUpload sfu = new ServletFileUpload(factory);
            sfu.setHeaderEncoding("utf-8");
 
            List<FileItem> fileItems = null;
            try {
                fileItems = sfu.parseRequest(request);
            } catch (FileUploadException e) {
                e.printStackTrace();
                return;
            }
            int i;
            for (i = 0; i < fileItems.size(); i++) {
                FileItem item = fileItems.get(i);
                if (!item.isFormField()) {
                    String itemFullName = item.getName();
                    if (itemFullName.length() > 0) {
                        String fileExtension = itemFullName
                                .substring(itemFullName.lastIndexOf("."));
                        String fileNewName = new SimpleDateFormat(
                                "yyyyMMdd_HHmmss").format(new Date())
                                + "_"
                                + Math.abs(ran.nextInt()) + fileExtension;
 
                        File file = new File(todayPath, fileNewName);
                        try {
                            item.write(file);
                            String name = "/upload/" + today + "/"
                                    + file.getName();                           
                            JSONObject path = new JSONObject();
                            path.put("Path", name);
                            paths.add(path);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
            if(i == fileItems.size()) {
                respCode = 0;
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            PrintWriter pw = response.getWriter();
            resultJson.put("response", respCode);
            resultJson.put("data", paths);
            pw.write(resultJson.toString());
            pw.flush();
            pw.close();
        }
    }
 
    /**
     * @throws IOException
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
     *      response)
     */
    protected void doGet(HttpServletRequest request,
            HttpServletResponse response) throws IOException {
        doPost(request, response);
    }
 
}
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