Struts中不限个数上传文件的实现方案

     在使用Struts的系统中使用 org.apache.struts.upload.FormFile 可以很方便的实现文件的上传，无论是单个或者多个文件。不过又应该如何来实现不限个数的文件上传呢？
      首先，在Jsp页面中，需要有像163那样动态添加附件的功能，这个可以使用JS来实现。代码如下：
       

[align=top" />fileTD";
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]        var fileId = "uploadFile(" +fileIndex+ ")";
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]        addInputFile(spanId, fileId);
[img]http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockEnd.gif" alt="" align="top[/img]    }
[img]http://www.blogjava.net/Images/OutliningIndicators/None.gif" alt="" align="top[/img]    function addInputFile(spanId, fileId)
    {
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]        var span = document.getElementById(spanId);
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]        if (span != null)
        {
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            var divObj = document.createElement("div");
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            var fileObj, delObj;
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            divObj.id = fileId;
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]               fileObj = document.createElement("");
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]               delObj = document.createElement("");
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            fileObj.name = fileId;
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            fileObj.size = "40";
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            fileObj.className = "input";
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            delObj.value ='删除';
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            divObj.appendChild(fileObj);
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            divObj.appendChild(document.createTextNode(" "));
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            divObj.appendChild(delObj);
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            span.appendChild(divObj);
[img]http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif" alt="" align="top[/img]        }
[img]http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockEnd.gif" alt="" align="top[/img]    }
[img]http://www.blogjava.net/Images/OutliningIndicators/None.gif" alt="" align="top[/img]    function delInputFile(spanId, fileId)
    {
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]        var span = document.getElementById(spanId);
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]        var divObj = document.getElementById(fileId);
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]        if (span != null && divObj != null)
        {
[img]http://www.blogjava.net/Images/OutliningIndicators/InBlock.gif" alt="" align="top[/img]            span.removeChild(divObj);
[img]http://www.blogjava.net/Images/OutliningIndicators/ExpandedSubBlockEnd.gif" alt="" align="top[/img]        }
[img]http://www.blogjava.net/Images/OutliningIndicators/ExpandedBlockEnd.gif" alt="" align="top[/img]    }[/align]


上面代码中的Html和JS代码就可以实现动态添加行的效果。（上述JS代码参考了一位网友的实现，这里对他表示感谢。）
Html代码中的 容易让人迷惑，我也是第一次写 name="uploadFile(0)"这样的Html代码。
这里的uploadFile(0)表示数组中index=0的元素，那么在Struts的FormBean中又应该如何让BeanUtils在做反射的时候可以正确的赋值呢？
来看一下FormBean中的代码：

[align=top" />[/align]

这里提供的setUploadFIle(String index, FormFile formFile)其实就是给BeanUtils一个正确的借口，让它可以对uploadFile(0)这样的元素进行正确的反射。当然，这里不用考虑index，直接将formFile添加进list中。

      因此，在Struts中不限个数上传文件的实现中，主要是页面中动态添加上传文件行和在FormBean中正确赋值，Action中要做的相信就很简单了，只要把FormBean中的List取出来逐个进行操作。