jsp+Ext2.0实现的文件上传功能

html代码：

<input type="button" class="x-btn"  onclick="uploadFile()" id="upFileBtn" value=" 上传文件 ">

<div id="upFile-dlg" class="x-hidden">
 <div class="x-window-header">
 </div>
 <div class="x-window-body">
   <form method="POST" action="" name="form2" enctype="multipart/form-data">
  <table align="center">
      <tr class="x-form-item">
    <td>请选择需要上传的文件: </td>
      </tr>
   <tr class="x-form-item">
    <td>
     <input type="file" name="fileUp" id='fileUp' class="mandatory" style="width:340px;" />
    </td>
   </tr>
  </table>
   </form> 
 </div>
</div>
 

js代码：

 uploadForm = new Ext.form.BasicForm('form2');
 var fileUp = new Ext.form.TextField( {
  applyTo:'fileUp',
  id : 'fileUp',
  allowBlank : false,
  width : 340
 });
 uploadForm.add(fileUp);

var upLoadDlg;
function uploadFile()
{
 if(upLoadDlg == null)
 {
    upLoadDlg = new Ext.Window(
        {
                el:'upFile-dlg',
                width:370,
                height:100,
                modal:true,
                closeAction:'hide',
                resizable: false,
                plain: true,
                buttons: [
                {
                 text: "上传",
                 handler: uploadfile
                },{
                    text: '取消',
                    handler: function(){
                        upLoadDlg.hide();
                    }
                }]
        });
   }
   upLoadDlg.show(Ext.get('upFileBtn').dom);
}

function uploadfile()
{
 var fileValue = Ext.get('fileUp').dom.value;
 if(uploadForm.isValid())
 {
  upLoadDlg.hide();
  
  uploadForm.doAction('submit', {
   url : "casefileUpload.jsp?caseId="+ caseId + "&fileValue=" + fileValue,
   method : 'post'
  });
 }else
 {
  Ext.MessageBox.alert("提示","请选择需要上传的文件!");
 }
}

jsp文件：（主要用到一个上传文件的包：commons-fileupload-1.2.jar）

<%
      response.setHeader("Cache-Control", "no-store");
      response.setHeader("Pragma", "no-cache");
      response.setDateHeader("Expires", 0);
%>
<%@ page contentType="text/html; charset=GB2312"%>
<%@ page import="org.apache.commons.logging.Log"%>
<%@ page import="org.apache.commons.logging.LogFactory"%>
<%@ page import="org.apache.commons.fileupload.*"%>
<%@ page import="com.nanwang.gebss.casedeal.CaseMaterialService"%>
<%@ page import="com.nanwang.gebss.db.CaseMaterial"%>
<%@ page import="java.text.SimpleDateFormat"%>
<%@ page import="java.io.*"%>
<%@ page import="java.util.*"%>

 <%
        if (request.getMethod().equalsIgnoreCase("get"))
        {
        }
        else
        {
          String caseId = request.getParameter("caseId");
          java.util.HashMap parameters = new java.util.HashMap();
          DiskFileUpload fu = new DiskFileUpload();
          // maximum size before a FileUploadException will be thrown
          fu.setSizeMax(100000000);
          // maximum size that will be stored in memory
          fu.setSizeThreshold(4096000);
          // the location for saving data that is larger than getSizeThreshold()
          fu.setRepositoryPath(application.getRealPath("/WEB-INF/"));

          java.util.List fileItems = fu.parseRequest(request);

          // assume we know there are two files. The first file is a small
          // text file, the second is unknown and is written to a file on
          // the server
          for (java.util.Iterator it = fileItems.iterator(); it.hasNext();)
          {
            FileItem fileItem = (FileItem) it.next();
            if (fileItem.isFormField())
            {
              String value = null;
              value = fileItem.getString(request.getCharacterEncoding());
                 parameters.put(fileItem.getFieldName(), value);
            }
            else
            {
              String comment = fileItem.getString();
              // filename on the client
              String fileName = fileItem.getName();
              // save comment and filename to database
              //...
              // write the file
              int i = 0;
              if (fileItem.getSize() > 0 && fileName != null
                  && fileName.length() > 0)
              {
                i = fileName.lastIndexOf('//');
                System.out.println(new java.io.File(application
                    .getRealPath("//photo")
                    + "//" + fileName.substring(i + 1)).getAbsolutePath());
                fileItem.write(new java.io.File(application.getRealPath("//photo")
                    + "//" + fileName.substring(i + 1)));
         
             CaseMaterial caseMaterial = new CaseMaterial();
             caseMaterial.setCaseId(String.valueOf(caseId));
             caseMaterial.setMaterialType("图片");
       caseMaterial.setSource("web");
       caseMaterial.setStoreKey(fileName.substring(i + 1));
          Date dt = new Date();
       SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
       String dateStr=sdf.format(dt);
       caseMaterial.setMemo(dateStr);
       CaseMaterialService caseMatSer = new CaseMaterialService();
       caseMatSer.insertCaseMaterial(caseMaterial);
              }
            }
          }

        }
 %>