fileupload图片上传到指定文件夹

用fileupload上传图片到工目录。并用时间格式重命名文件，然后把文件名写进数据库。供前后台调用

1.前台JSP 表单提交 重点：method="post" enctype="multipart/form-data"

<form name="myform" action="imgupload.action?name=<%=saler.getName()%>" method="post"  enctype="multipart/form-data"  class="myform">

              <br>

              <span>上传或修改图片，1M以内！</span>

              <input type="file" name="myfile"><br>

              <input type="submit" name="submit"value="   确 定   "/>

 </form>

2.后台servlet         请无视对你无用的包、

    

packagefileupload;

 

import java.io.File;

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.Connection;

import java.sql.Statement;

import java.text.DateFormat;

import java.text.SimpleDateFormat;

import java.util.Calendar;

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;  

import util.DBUtil;

@SuppressWarnings("serial")

publicclass Upload extends HttpServlet {    

   private String uploadPath = "C:\Users\lonec\OneDrive\EatIt\EatIt\WebRoot\images"; // 上传文件的目录 

   private String tempPath  = "C:\Users\lonec\OneDrive\EatIt\EatIt\WebRoot\images\buffer"; // 临时文件目录    

   File tempPathFile;     

   @SuppressWarnings("unchecked")    

   publicvoid doPost(HttpServletRequest request, HttpServletResponse response)           

   throws IOException, ServletException {

      request.setCharacterEncoding("utf-8");

      response.setContentType("text/html;charset=utf-8");

      PrintWriter out = response.getWriter();

      try {           

         // Create a factory for disk-based fileitems           

         DiskFileItemFactory factory = new DiskFileItemFactory();            

          

         // Set factory constraints           

         factory.setSizeThreshold(4096); // 设置缓冲区大小，这里是 4kb           

         factory.setRepository(tempPathFile); // 设置缓冲区目录            

        

         // Create a new file upload handler           

         ServletFileUpload upload = new ServletFileUpload(factory);

         upload.setHeaderEncoding("utf-8");

        

         // Set overall request size constraint           

         upload.setSizeMax(1048576); // 设置最大文件尺寸，这里是 4MB         

         List<FileItem> items = upload.parseRequest(request);// 得到所有的文件            

         Iterator<FileItem> i = items.iterator();

         String imgnameString0=null;

         if (i.hasNext()) {              

            FileItem fi = (FileItem) i.next();              

            String fileName = fi.getName();

            if (fileName != null&&(fileName.endsWith(".jpg")||fileName.endsWith(".JPG")||fileName.endsWith(".png")||fileName.endsWith(".PNG"))) {

                System.out.println(fi);

             

               

                DateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");

                Calendar calendar = Calendar.getInstance();

                String imageName = df.format(calendar.getTime());

                String endname=imageName+".jpg";    // 统一转化成jpg文件  

                System.out.println(imageName);

                imgnameString0=endname;

               

                File savedFile = new File(uploadPath,endname);

                System.out.println(savedFile);

                fi.write(savedFile);

                 

            }else{

                out.println("<script>alert('请上传正确的文件类型！');history.go(-1);</script>");

            }

           

         } 

        

         //写进数据库

       

 

         String[] imgnameString = imgnameString0.split("\.");

         System.out.println(imgnameString[0]);

        

         Connection conn=null;

         Statement ps=null;

         String salername=request.getParameter("name");

         byte[] sn = salername.getBytes("iso-8859-1");

         salername = new String(sn,"utf-8");

        

         String sqlString=" UPDATE EatIt_Saler SET imgName ='"+imgnameString[0]+"' WHERE name ='"+salername+"'";

         try {

            conn=DBUtil.getConnection();

            ps=conn.createStatement();

             ps.executeUpdate(sqlString);

             

         } catch (Exception e) {

            e.printStackTrace();

         }

          

         //成功后页面跳转，并且刷新

         String page="published.do?name="+salername;    //published.do?name=<%=saler.getName()%>setTimeout();

        out.println("<script>alert('上传成功！');  window.location.href=""+page+""; </script>");//页面带参数跳转  

     

         } catch (Exception e) {      

            // 可以跳转出错页面     

            System.out.print("失败：图片大小超过1M！ ");

            out.println("<script>alert('图片大小超过1M！');history.go(-1);</script>");

            /*e.printStackTrace();        */

         }   

   }      

   publicvoid init() throws ServletException {      

      File uploadFile = new File(uploadPath);       

      if (!uploadFile.exists()) {

         uploadFile.mkdirs();       

      }       

      File tempPathFile = new File(tempPath);        

      if (!tempPathFile.exists()) {          

         tempPathFile.mkdirs();       

      }   

   }

}

3.servlet 配置 web.xml文件 、无用的部分已经删除

<?xml version="1.0"encoding="UTF-8"?>

<web-app version="2.5"xmlns="http://java.sun.com/xml/ns/javaee"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

   <display-name>file</display-name>

   <servlet>

     <servlet-name>Upload</servlet-name>

     <servlet-class>fileupload.Upload</servlet-class>

  </servlet>

  

   <servlet-mapping>

     <servlet-name>Upload</servlet-name>

     <url-pattern>/imgupload.action</url-pattern>

  </servlet-mapping>

</web-app>