Apache Commons FileUpload??????????????????

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?????????import   blank   commons   san   size   ??????   page   use   ??????   

Commons FileUpload??????

Apache Commons???????????????????????????Java??????????????? Apache ?????????Apache Commons??????????????????????????????

1???Commons Proper - ?????????Java?????????????????????

2???The Commons Sandbox - ??????Java???????????????????????????

3???The Commons Dormant - ????????????????????????????????????

Commons-FileUpload???Commons Proper???????????????????????????????????????Commons-IO ???Commons-IO?????? Commons Proper?????????????????????

Commons FileUpload ???JAR?????????

Commons IO ???JAR?????????

????????????????????????

????????????????????????

FileUpload???????????????html?????????????????????????????????HTTP?????? ??????????????????????????????POST????????????HTTP??????????????????????????????“multipart / form-data”??????FileUpload???????????????????????????????????????????????????

1???????????????POST?????????GET?????????????????????????????????????????????HTTP??????????????????

2???form????????????????????????type="file"???input?????????

3???form?????????enctype?????????????????????????????????????????????????????????????????????????????????????????????multipart/form-data???

enctype??????

enctype?????????????????????application/x-www-form-urlencoded | multipart/form-data | text/plain???

enctype?????????????????????application/x-www-form-urlencoded??????????????????form????????????????????????????????????????????????????????????????????????????????????name=value&name=value&name=value...???

multipart/form-data???????????????????????????????????????????????????????????????????????????????????????????????????form?????????????????????????????????

text/plain???????????????????????? "+" ???????????????????????????????????????

index.jsp????????????

<%@page contentType="text/html; charset=utf-8"%>
<!doctype html>
<html>
    <head>
        <title>apache commons fileupload</title>
    </head>
    <body>
        
        <form action="${pageContext.request.contextPath }/fileupload" method="post" enctype="multipart/form-data">
            <%-- ??????????????? --%>
            username<input type="text" name="username"><br> <%-- FileItem --%>
            <%-- ???????????? --%>
            file1<input type="file" name="file1"><br> <%-- FileItem --%>
            file2<input type="file" name="file2"><br> <%-- FileItem --%>
            <input type="submit" value="submit">
        </form>
        
    </body>
</html>

????????????????????????

??????JAR??????????????????????????????????????????

Servlet??????

package com.wb.controller;

import java.io.File;
import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
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;

@WebServlet(urlPatterns = {"/fileupload"})
public class FileUpController extends HttpServlet{

   private static final long serialVersionUID = 5351212300627874456L;

   @Override
   protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       
       //????????????“????????????????????????”??????
       DiskFileItemFactory factory = new DiskFileItemFactory();
       //?????????????????????JVM??????????????????????????????????????????????????????10KB???
       factory.setSizeThreshold(DiskFileItemFactory.DEFAULT_SIZE_THRESHOLD);
       //?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????1GB ?????????????????????1MB???
       factory.setRepository(new File("E:\TestFileUpload\files"));
       
       //??????????????????
       ServletFileUpload fileUpload = new ServletFileUpload(factory);
       //???????????????????????????????????????10MB???
       fileUpload.setFileSizeMax(1024*1024*10);
       //?????????????????????????????????
       //fileUpload.setHeaderEncoding("UTF-8");
       
       if (ServletFileUpload.isMultipartContent(req)) {
           try {
               //????????????
               List<FileItem> fileItems = fileUpload.parseRequest(req);
               for (FileItem fileItem : fileItems) {
                   if(fileItem.isFormField()) {//?????????FileItem??????????????????form??????
                       //???????????????
                       String fieldName = fileItem.getFieldName();
                       //?????????????????????????????????
                       String fieldValue = fileItem.getString("UTF-8");
                       //String fieldValue = fileItem.getString();
                       System.out.println(fieldName + ":" + fieldValue);
                   }else {//?????????FileItem???????????????
                       //???????????????
                       String fileName = fileItem.getName();
                       System.out.println("fileName=" + fileName);
                       //??????????????????
                       long fileSize = fileItem.getSize();
                       System.out.println("fileSize=" + fileSize);
                       fileItem.write(new File("E:\TestFileUpload\files" + File.separator + fileName));
                   }
               }
           } catch (FileUploadException e) {
               e.printStackTrace();
           } catch (Exception e) {
               e.printStackTrace();
           }
       }
   }

}

 

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