JSP 和Apache Upload
使用Apache FileUpload 讓上傳檔案變的比較簡單
1.先寫一個form來選檔案準備上傳,注意的地方是enctype="multipart/form-data"
=== uploadFile2.jsp ===

	<%@page contentType="text/html" pageEncoding="UTF-8"%>

  
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Uplaod File Sample</title>
  
  
    <form action="recvFile2.jsp" method="post" enctype="multipart/form-data">
      Select File to upload :<input type="file" name="filename" value="" /><br>
      <input type="submit" value="Upload" name="upload" />
    </form>
  

2.使用Apache FileUpload
=== recvFile2.jsp ===

	<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ page import="java.io.File"%>
<%@ page import="java.util.Iterator"%>
<%@ page import="java.util.List"%>
<%@ page import="org.apache.commons.fileupload.*"%>
<%@ page import="org.apache.commons.fileupload.disk.DiskFileItemFactory"%>
<%@ page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%>
<%@ page import="org.apache.commons.io.FilenameUtils"%>
<%
    String saveDirectory = "D:/kill/upload";
    // Check that we have a file upload request
    boolean isMultipart = ServletFileUpload.isMultipartContent(request);
    out.println("isMultipart="+isMultipart+"<br>");

    // Create a factory for disk-based file items
    FileItemFactory factory = new DiskFileItemFactory();

    // Create a new file upload handler
    ServletFileUpload upload = new ServletFileUpload(factory);

    //Create a progress listener
    ProgressListener progressListener = new ProgressListener(){
       private long megaBytes = -1;
       public void update(long pBytesRead, long pContentLength, int pItems) {
           long mBytes = pBytesRead / 1000000;
           if (megaBytes == mBytes) {
               return;
           }
           megaBytes = mBytes;
           System.out.println("We are currently reading item " + pItems);
           if (pContentLength == -1) {
               System.out.println("So far, " + pBytesRead + " bytes have been read.");
           } else {
               System.out.println("So far, " + pBytesRead + " of " + pContentLength
                                  + " bytes have been read.");
          }
       }
    };
    upload.setProgressListener(progressListener);

    // Parse the request
    List /* FileItem */ items = upload.parseRequest(request);

    // Process the uploaded items
    Iterator iter = items.iterator();
    while (iter.hasNext()) {
        FileItem item = (FileItem) iter.next();

        if (item.isFormField()) {
           // Process a regular form field
            //processFormField(item);
            String name = item.getFieldName();
            String value = item.getString();
            value = new String(value.getBytes("UTF-8"), "ISO-8859-1");
            out.println(name + "=" + value+"<br>");
        } else {
            // Process a file upload
            //processUploadedFile(item);
            String fieldName = item.getFieldName();
            String fileName = item.getName();
            String contentType = item.getContentType();
            boolean isInMemory = item.isInMemory();
            long sizeInBytes = item.getSize();
            out.println("fieldName="+fieldName+"<br>");
            out.println("fileName="+fileName+"<br>");
            out.println("contentType="+contentType+"<br>");
            out.println("isInMemory="+isInMemory+"<br>");
            out.println("sizeInBytes="+sizeInBytes+"<br>");
            if (fileName != null && !"".equals(fileName)) {
                fileName= FilenameUtils.getName(fileName);
                out.println("fileName saved="+fileName+"<br>");
                File uploadedFile = new File(saveDirectory, fileName);
                item.write(uploadedFile);
            }
        }
    }
%>