struts.xml配置：

<constant name="struts.multipart.maxSize" value="4096000000" />

對於檔案型別的過濾，優先順序allowedTypes大於allowedExtensions，2種方法都可行，後者比較方便，配置了後者最好就不要使用前者了，因為優先順序的原因會致其無效。

<!-- Application Library Manage Start -->
<action name="uploadactions" class="appLibraryAction"
method="upload">
<!-- 配置fileUpload的攔截器 -->
<interceptor-ref name="fileUpload">
<!-- 配置允許上傳的檔案型別 -->
<!-- 允許字尾名為png,bmp,jpg,doc,xls的檔案上傳 -->     
               <param name="allowedExtensions">  
                 png,bmp,jpg,ipa,apk,mkv,exe,zip,rar,iso
                </param>  
<!-- 
<param name="allowedTypes">
image/bmp,image/png,image/gif,image/jpeg,image/pjpeg,image/jpg,application/msword,text/plain
</param>
-->
<!-- 配置允許上傳的檔案大小 -->
<!-- <param name="maximumSize">2000000000</param> -->
</interceptor-ref>
<interceptor-ref name="defaultStack" />
<result>/taguser/fileuploadoutput.jsp</result>
<result name="input">/taguser/fileuploads.jsp</result>
</action>
 

<s:form action="uploadactions"  method="post" enctype="multipart/form-data">
     <s:file name="upload" label="path"/>
     <s:file name="upload" label="path"/>
     <s:file name="upload" label="path"/>
     <s:submit value="upload"/>
 </s:form>

action方法：

   //封裝多個上傳檔案域的屬性   
    private List<File> upload = new ArrayList<File>();   
    // 封裝多個上傳檔案型別的屬性   
    private List<String> uploadContentType = new ArrayList<String>();   
    // 封裝多個上傳檔名的屬性   
    private List<String> uploadFileName = new ArrayList<String>();   
       
    //動態設定上傳檔案儲存地址   
    private String savePath;   
       
    public String getSavePath() { 
     System.out.println("getSavePath()!!!!!");
     
     System.out.println(savePath+"++++++++++++++++++++++++++++++");
        return savePath;   
    }   
  
    public void setSavePath(String savePath) {
     System.out.println("setSavePath()!!!!!");
        this.savePath = savePath;
       // savePath = "E:\\butone\\struts2.2\\WebRoot\\images\\"+getUploadFileName();
    }     
  
    //上傳多個檔案對應檔案內容的setter和getter方法   
    public List<File> getUpload() {   
        return upload;   
    }   
    public void setUpload(List<File> upload) { 
     System.out.println("----------------    setUpload(List<File> upload)     ----------------");
        this.upload = upload;   
    }   
       
    //  上傳多個檔案的檔案型別setter和getter方法    
    public List<String> getUploadContentType() {   
        return uploadContentType;   
    }   
    public void setUploadContentType(List<String> uploadContentType) {   
        this.uploadContentType = uploadContentType;   
    }   
  
    // 上傳多個檔案的檔名的setter和getter方法    
    public List<String> getUploadFileName() {   
        return uploadFileName;   
    }   
    public void setUploadFileName(List<String> uploadFileName) {   
        this.uploadFileName = uploadFileName;   
    }   
  
    public String upload() {   
     
     //savePath = "E:\\butone\\struts2.2\\WebRoot\\images\\";
     savePath = ServletActionContext.getRequest().getRealPath("");
     
     System.out.println("upload()!!!!!");
        //上傳多個檔案   
        List<File> files = getUpload();   
        // String ext ="";   
        FileOutputStream fos = null;   
        FileInputStream fis = null;   
        byte[] buffer = new byte[1024];   
        int len = 0;   
        Random rd = new Random();   
        System.out.println(files.size()+"               ----------------");
        System.out.println(getSavePath());
        for (int i = 0; i < files.size(); i++) {   
            try {   
                //以伺服器的檔案儲存地址和當前時間組合檔名建立上傳檔案輸出流   
                // ext =uploadFileName.get(i).substring(uploadFileName.get(i).lastIndexOf('.'));   
                 /* fos = new FileOutputStream(getSavePath()+ File.separator+  
                 * DateFormatUtil.getCurrentCustomFormatDateTime(DateFormatUtil.DATE_TIME_FORMAT_14) + 
                 * String.valueOf(rd.nextInt(1000))+ext);  
                 */  
             System.out.println(getSavePath()+"------------------------getsavepath!!!");
                fos = new FileOutputStream(getSavePath() + File.separator + uploadFileName.get(i));   
                // 以上傳檔案建立一個檔案上傳流   
                fis = new FileInputStream(files.get(i));   
                // 將上傳檔案的內容寫入伺服器   
                len = 0;   
                while ((len = fis.read(buffer)) > 0) {   
                    fos.write(buffer, 0, len);   
                }   
            } catch (Exception e) {   
                e.printStackTrace();   
            }   
        }   
         return SUCCESS;   
    }   
 

最後，上傳過程中，可能會遇到read time out錯誤。原因是web容器的配置問題，以tomcat為例，需要修改tomcat的server.xml

<Connector connectionTimeout="20000" port="8080" protocol="HTTP/1.1" redirectPort="8443" disableUploadTimeout="false"/>
<!--這裡就添加了 disableUploadTimeout="false"一般預設情況下disableUploadTimeout的值為true-->