文件的上传servlet

package com.sxt.servlet;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

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

import org.apache.commons.fileupload.FileItemIterator;
import org.apache.commons.fileupload.FileItemStream;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.util.Streams;

import com.sxt.bean.Goods;
import com.sxt.dao.GoodsDao;
import com.sxt.dao.impl.GoodsDaoImpl;

public class SaveGoodsServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)        throws ServletException, IOException {    this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)        throws ServletException, IOException {    // 创建一个文件form表达存储数据的map    Map<String, String> map = new HashMap<String, String>();    // 获取上传文件类型    if (ServletFileUpload.isMultipartContent(request)) {        // 创建ServletFileUpload实例        ServletFileUpload fileUpload = new ServletFileUpload();        try {            // 解析request请求 返回FileItemStream的iterator实例            FileItemIterator iter = fileUpload.getItemIterator(request);            InputStream is = null;// 输出流            // 迭代取出            while (iter.hasNext()) {                FileItemStream item = iter.next();// 获取文件流                String name = item.getFieldName();// 返回表单中标签的name值                is = item.openStream();// 得到对应表单的输出流                if (item.isFormField()) {// 如果是非文件域,设置进入map,这里要注意多值处理                    String value = Streams.asString(is,"UTF-8");                    map.put(name, value); // 如果不是文件上传,处理                } else {                    if (is.available() > 0) {// 如果输出流的内容大于0                        String fname = item.getName();// 获取文件名                        // 修改这个名字不能产生覆盖问题 时间戳                        int a = (int) (Math.random() * 100);                        long l = new Date().getTime();                        fname = String.valueOf(l) + a + fname;                        map.put("gurl", "upload/" + fname);                        String path = request.getServletContext().getRealPath("/")+ "upload/" + fname;                        Streams.copy(is, new FileOutputStream(path), true);// 拷贝内容到上传路径                    }                }            }        } catch (FileUploadException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }    GoodsDao dao = new GoodsDaoImpl();    String gid = map.get("gid");    Integer gi = null;    if(gid!=null && !gid.equals("")){        gi = Integer.valueOf(gid);    }    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    PrintWriter out = response.getWriter();    try {        Date d = sdf.parse(map.get("prodate"));        Timestamp t = new Timestamp(d.getTime());        Goods g = new Goods(gi, map.get("gname"), Double.parseDouble(map.get("gprice")), Integer.valueOf(map.get("gnum")),t,  map.get("gaddr"), map.get("gtel"), Integer.valueOf(map.get("gstatus")), map.get("gurl"));        boolean b = dao.saveGoods(g);        if(b){            out.print(1);        }else{            out.print(0);        }    } catch (Exception e) {        e.printStackTrace();    }     out.close();}

}