文件上传

以你之姓@ 2021-07-20 21:47 406阅读 0赞

在form里定义一个formfile的对象， protected FormFile file;  
在页面里写： <tr>  
        <th>  
            <Myapp:label key="uploadForm.file"/>  
        </th>  
        <td>  
            <html:file property="file" size="50" styleId="file" />  
        </td>  
    </tr>

action里：

public ActionForward save(ActionMapping mapping, ActionForm form,  
                              HttpServletRequest request,  
                              HttpServletResponse response)  
    throws Exception \{  
        if (log.isDebugEnabled()) \{  
            log.debug("Entering 'save' method");  
        \}

// Extract attributes and parameters we will need  
        ActionMessages messages = new ActionMessages();  
        DocumentForm documentForm = (DocumentForm) form;  
        boolean isNew = ("".equals(documentForm.getDocumentid()) || documentForm.getDocumentid() == null);

DocumentManager mgr = (DocumentManager) getBean("documentManager");  
        
       
         
        String encoding = request.getCharacterEncoding();

if ((encoding != null) && (encoding.equalsIgnoreCase("utf-8"))) \{  
            response.setContentType("text/html; charset=utf-8");  
        \}

DocumentForm theForm = (DocumentForm) form;  
        //retrieve the file representation  
        FormFile file = theForm.getFile();

//retrieve the file name  
        String fileName = file.getFileName();

String location = null;

// the directory to upload to  
        String uploadDir =  
            servlet.getServletContext().getRealPath("/resources") + "/"  
            + request.getRemoteUser() + "/";

//write the file to the file specified  
        File dirPath = new File(uploadDir);

if (!dirPath.exists()) \{  
            dirPath.mkdirs();  
        \}

//retrieve the file data  
        InputStream stream = file.getInputStream();

//write the file to the file specified  
        OutputStream bos = new FileOutputStream(uploadDir + fileName);  
        int bytesRead = 0;  
        byte\[\] buffer = new byte\[8192\];

while ((bytesRead = stream.read(buffer, 0, 8192)) != -1) \{  
            bos.write(buffer, 0, bytesRead);  
        \}  
        theForm.setPath(uploadDir);  
        bos.close();

location = dirPath.getAbsolutePath()  
            + Constants.FILE\_SEP + file.getFileName();  
        System.out.println("location..................."+ location);  
        //close the stream  
        stream.close();

//destroy the temporary file created  
        file.destroy();  
         
         
        Document document = (Document) convert(documentForm);  
        mgr.saveDocument(document);  
        // add success messages  
        if (isNew) \{  
            messages.add(ActionMessages.GLOBAL\_MESSAGE,  
                         new ActionMessage("document.added"));

// save messages in session to survive a redirect  
            saveMessages(request.getSession(), messages);

return mapping.findForward("search");  
        \} else \{  
            messages.add(ActionMessages.GLOBAL\_MESSAGE,  
                         new ActionMessage("document.updated"));  
            saveMessages(request, messages);

return mapping.findForward("edit");  
        \}  
    \}

其中上传时遇到一个问题：

javax.servlet.ServletException: BeanUtils.populate

查询后找到答案，在<html:form>是加上这一属性：  
  
enctype="multipart/form-data"

还不知道为什么。

先总结这么多，暂时记一下，过几天来加多文档的上传。