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采用dwr+ajax和struts开发文件上传进度条

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  • lcmlcm
  • 等级: 初级会员
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  • 文章: 11
  • 积分: 10
  • 来自: 北京
   发表时间：2008-05-25  
DWR
编写监听器以及相关的类

不用自己写了，源码可以从

http://www.telio.be/blog/2006/01/06/ajax-upload-progress-monitor-for-commons-fileupload-example里面下载，

下载地址

http://www.telio.be/blog/wp-content/uploads/2006/01/ajax-upload-1.0.war

下载完之后，你需要解包，在命令行中：

jar xvf ajax-upload-1.0.war

源码就在\WEB-INF\src下面

将要用到的文件有resources文件夹下，\WEB-INF\下面的dwr.xml和lib下面的jar文件

上传页面

在上面解开的包里面有index.jsp这个是上传页面，upload.jsp负责上传，resources包里面包含了dwr与服务器通讯的javascript脚本，你需要把index.jsp的form中的action换成你的struts action即可，然后把form中的file名改成你actionform中的file属性名，把页面中剩余的file去掉

index.jsp上传页面示例代码：

<%@ page contentType="text/html; charset=gb2312" language="java"

    import="java.util.*" errorPage=""%>

<%

    String path=request.getContextPath();

%>

<html locale="true">

<head>

<SCRIPT language=javascript>

function check_file() {

  var strFileName=document.forms(0).file;

  if (strFileName.value==""){

    alert("请选择要上传的文件");

    return false;

  }

  startProgress();

}

function loadmessage(){ 

        <%

       if (request.getAttribute("message") != null) {

       %> 

           window.alert("<%=request.getAttribute("message")%>");

           window.returnValue="yes";

       <%}%>

}

</SCRIPT>

<title>上传</title>

       <script src='<%=path%>/resources/js/upload.js'> </script>

        <script src='<%=path%>/dwr/interface/UploadMonitor.js'> </script>

        <script src='<%=path%>/dwr/engine.js'> </script>

        <script src='<%=path%>/dwr/util.js'> </script>

        <style type="text/css">

            #progressBar { padding-top: 5px; }

            #progressBarBox { width: 350px; height: 20px; border: 1px inset; background: #eee;}

            #progressBarBoxContent { width: 0; height: 20px; border-right: 1px solid #444; background: blue; }

        </style>

       <LINK href="<%=path%>/css/style.css" type="text/css" rel="stylesheet">



<meta http-equiv="Content-Type" content="text/html; charset=gb2312">

</head>

<style type="text/css">

<!--

body {

    margin-left: 0px;

    margin-top: 0px;

    margin-right: 0px;

    margin-bottom: 0px;



}

-->

</style>

<body leftmargin="0" topmargin="0" marginwidth="0" marginheight="0" onLoad="loadmessage()">

<form name="form" method="post" action="<%=path%>/upload.do?method=upload" enctype="multipart/form-data"  onSubmit="return check_file()">

  <table width="60%"  border="0" cellspacing="1">

    <tr background-color=" #E7F5FE">

      <td width="30%" align="right">从文件导入：</td>

      <td width="51%"><input type="file" name="file" class="input"></td>

      <td width="27%"><input type="submit" name="files" class="button_4"

                        style="border-style:None;width:71px;" value="确定" id="uploadbutton">

      </td>

    </tr>

    <tr align="left" background-color=" #E7F5FE">

      <td colspan="3">

      <div id="progressBar" style="display: none;">



            <div id="theMeter">

                <div id="progressBarText"></div>

                <div id="progressBarBox">

                    <div id="progressBarBoxContent"></div>

                </div>

            </div>

        </div>

      </td>

    </tr>

  </table>

</form>

</body>

</html>

并且要修改一下\resources\js中的upload.js文件：

/* Licence:

*   Use this however/wherever you like, just don't blame me if it breaks anything.

*

* Credit:

*   If you're nice, you'll leave this bit:

*

*   Class by Pierre-Alexandre Losson -- http://www.telio.be/blog

*   email : plosson@users.sourceforge.net

*/

function refreshProgress()

{

    UploadMonitor.getUploadInfo(updateProgress);

}



function updateProgress(uploadInfo)

{

    if (uploadInfo.inProgress)

    {

       document.getElementById('uploadbutton').disabled = true;

        document.getElementById('file').disabled = true;



        var fileIndex = uploadInfo.fileIndex;



        var progressPercent = Math.ceil((uploadInfo.bytesRead / uploadInfo.totalSize) * 100);



        document.getElementById('progressBarText').innerHTML = '文件读取进度: ' + progressPercent + '%';



        document.getElementById('progressBarBoxContent').style.width = parseInt(progressPercent * 3.5) + 'px';



        window.setTimeout('refreshProgress()', 1000);

    }

    else

    {

        document.getElementById('uploadbutton').disabled = false;

        document.getElementById('file').disabled = false;

    }



    return true;

}



function startProgress()

{

    document.getElementById('progressBar').style.display = 'block';

    document.getElementById('progressBarText').innerHTML = '文件读取进度: 0%';

    document.getElementById('uploadbutton').disabled = true;



    // wait a little while to make sure the upload has started ..

    window.setTimeout("refreshProgress()", 1000);

    return true;

}

配置dwr.xml

放在/WEB-INF/下面

<dwr>

    <allow>

        <create creator="new" javascript="UploadMonitor">

            <param name="class" value="be.telio.mediastore.ui.upload.UploadMonitor"/>

        </create>

        <convert converter="bean" match="be.telio.mediastore.ui.upload.UploadInfo"/>

    </allow>

</dwr>

web.xml中配置dwr，省略spring，struts等的配置

<servlet>

              <servlet-name>dwr-invoker</servlet-name>

              <display-name>DWR Servlet</display-name>

              <servlet-class>uk.ltd.getahead.dwr.DWRServlet</servlet-class>

              <init-param>

                     <param-name>debug</param-name>

                     <param-value>false</param-value>

              </init-param>

              <init-param>

                     <param-name>logLevel</param-name>

                     <param-value>WARN</param-value>

              </init-param>

</servlet>

<servlet-mapping>

              <servlet-name>dwr-invoker</servlet-name>

              <url-pattern>/dwr/*</url-pattern>

</servlet-mapping>

编写struts的MultipartRequestHandler ：AjaxMultipartRequestHandler

实现 MultipartRequestHandler接口并在struts-config.xml的controller中替换默认的multipartClass

<controller>

              <set-property property="multipartClass"

                     value="org.springside.components.ajaxupload.AjaxMultipartRequestHandler" />

</controller>

其实这个类AjaxMultipartRequestHandler编写很简单，把struts的src源码中的org.apache.struts.upload.CommonsMultipartRequestHandler.java修改一下就可以了：

在public void handleRequest(HttpServletRequest request)

           throws ServletException {

方法中把定义factory之前的那几行代码注释掉然后写入

UploadListener listener = new UploadListener(request, 30);

FileItemFactory factory = new MonitoredDiskFileItemFactory(listener);

之后再注释掉

// upload.setSizeThreshold((int) getSizeThreshold(ac));

// upload.setRepositoryPath(getRepositoryPath(ac));

这个类就算写完了

编写struts上传类

就用你原来编写的struts上传类

上传方法代码段示例：

/**

     * 上传文件

     */

    public ActionForward upload(ActionMapping mapping, ActionForm form,

           HttpServletRequest request, HttpServletResponse response)

           throws Exception {

       String path = getServlet().getServletContext().getRealPath("/");

       log.info(">>>>>>>>>>>>>>>path:" + path);

       if (form == null) {

           return mapping.findForward("success");

       }

       FileUploadForm fuf = (FileUploadForm) form;

       FormFile file = fuf.getFile();

       try {

           if (file == null) {

              log.info(">>>>>>>>>>>>>>>file为空");

              return mapping.findForward("success");

           }

       } catch (Exception e) {

           e.printStackTrace();

       }

       String fname = file.getFileName();

       int t = 0;

       for (int i = 0; i < fname.length(); i++) {

           if (fname.charAt(i) == '.') {

              t = i;

           }

       }

       String filename = null;

       if (t > 0) {

           filename = fname.substring(0, t);

       }

       log.info(">>>>>>>>>>>>>>>文件名：" + filename);

       String filepath = path + "dataimport/upfiles/" + fname;

       File f = new File(path + "dataimport/upfiles/");

       log.info(">>>>>>>>>>>>>>>文件生成路径：" + filepath);

       if (!f.exists()) {

           f.mkdirs();

       } else {

           log.info(">>>>>>>>>>>>>>>路径存在");

       }

       InputStream stream = file.getInputStream();

       OutputStream os = new FileOutputStream(path + "dataimport/upfiles/"

              + fname);

       int readBytes = 0;

       byte buffer[] = new byte[8192];

       while ((readBytes = stream.read(buffer, 0, 8192)) != -1) {

           os.write(buffer, 0, readBytes);

       }

       os.close();

       stream.close();

       file.destroy();

      

       String message = "成功！";

       request.setAttribute("message", message);

       return mapping.findForward("success");

    }

转摘悟空大哥。。。
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