如何在相對目錄中上傳文件

Question

我已經創建了一個應用程序，可以在其中上傳將保存在本地給定目錄中的任何文件。 我想修改它，我想為部門添加一個下拉列表（具有多個選項，例如，樓層，商店，區域）。 即，如果我們要上傳“存儲”文件夾中的文件，則可以選擇“存儲”選項，文件將上傳到“存儲”文件夾中。 “地板”和“部分”相同。 我只需要任何示例鏈接即可。 我已經在liferay中做到了。

import org.apache.commons.io.FileUtils;


import com.liferay.portal.kernel.upload.UploadPortletRequest;
import com.liferay.portal.util.PortalUtil;
import com.liferay.util.bridges.mvc.MVCPortlet;

public class UploadDirectory extends MVCPortlet {

    private final static int ONE_GB = 1073741824;

    private final static String baseDir = "/home/xxcompny/workspace";

    private final static String fileInputName = "fileupload";

    public void upload(ActionRequest request, ActionResponse response)
            throws Exception {

        UploadPortletRequest uploadRequest = PortalUtil.getUploadPortletRequest(request);

        long sizeInBytes = uploadRequest.getSize(fileInputName);

        if (uploadRequest.getSize(fileInputName) == 0) {
            throw new Exception("Received file is 0 bytes!");
        }


        File uploadedFile = uploadRequest.getFile(fileInputName);

        String sourceFileName = uploadRequest.getFileName(fileInputName);



        File folder = new File(baseDir);



        if (folder.getUsableSpace() < ONE_GB) {
            throw new Exception("Out of disk space!");
        }


        File filePath = new File(folder.getAbsolutePath() + File.separator + sourceFileName);


        FileUtils.copyFile(uploadedFile, filePath);
    }

}

JSP在這里

<%@ taglib uri="http://java.sun.com/portlet_2_0" prefix="portlet" %>
<%@ taglib uri="http://liferay.com/tld/aui" prefix="aui"%>
<%@ taglib uri="http://liferay.com/tld/ui" prefix="liferay-ui"%>
<portlet:defineObjects />

<portlet:actionURL name="upload" var="uploadFileURL"></portlet:actionURL>

<aui:form action="<%= uploadFileURL %>" enctype="multipart/form-data" method="post">

<select name="folder">
  <option value="store">Store</option>
  <option value="floor">Floor</option>
  <option value="department">Department</option>
</select>

<aui:input type="file" name="fileupload" />
<aui:button name="Save" value="Save" type="submit" />

</aui:form>

我希望文件將上傳到所屬文件夾中。

Answer 1

您可以使用以下代碼

String user_selected_option=request.getParameter("userSel")
realPath = getServletContext().getRealPath("/files");
 destinationDir = new File(realPath+"/"+user_selected_option);

// save to destinationDir 

Answer 2

我有類似的任務將文件上傳到指定的文件夾，因此以下是根據您的要求進行了一些修改的代碼：

public void upload(ActionRequest request, ActionResponse response)
    throws Exception {

    UploadPortletRequest uploadRequest = PortalUtil.getUploadPortletRequest(request);
    long sizeInBytes = uploadRequest.getSize(fileInputName);

    if (sizeInBytes == 0) {
        throw new Exception("Received file is 0 bytes!");
    }

    File uploadedFile = uploadRequest.getFile(fileInputName);
    String sourceFileName = uploadRequest.getFileName(fileInputName);

    /* selected folder from UI */
    String paramFolder = uploadRequest.getParameter("folder");

    byte[] bytes = FileUtil.getBytes(uploadedFile);

    if (bytes != null && bytes.length > 0) {
        try {
            /* Create folder if doesn't exist */
            File folder = new File(baseDir + File.separator + paramFolder);
            if (!folder.exists()) {
                folder.mkdir();
            }

            /* Write file to specified location */
            File newFile = new File(folder.getAbsolutePath() + File.separator + sourceFileName);            
            FileOutputStream fileOutputStream = new FileOutputStream(newFile);
            fileOutputStream.write(bytes, 0, bytes.length);
            fileOutputStream.close();           
            newFile = null;

        } catch (FileNotFoundException fnf) {
            newFile = null;
            /* log exception */
        } catch (IOException io) {
            newFile = null;
            /* log exception */
        }
    }
}