简短的问题:如何在保持代码门户平台独立的javax.portlet.GenericPortlet:serveResource
方法实现中处理文件上传?
长问题:我正在创建一个javax.portlet.GenericPortlet
的实现。此 Portlet 必须部署在 WebSphere Portal 和 Liferay Portal 上。在此 portlet 的serveResource
方法中,我读取了一个multipart/form-data
请求。据我所知,在Liferay中,我可以这样处理文件上传:
// save the request attached file from the client
UploadPortletRequest uploadRequest = PortalUtil.getUploadPortletRequest(resourceRequest);
String fileName = uploadRequest.getFileName(paramFile);
InputStream inputStream = uploadRequest.getFileAsStream(paramFile, true);
此代码片段的问题在于它依赖于Liferay门户,并且显然它将在另一个门户版本上爆发。
我已经看过库 apache commons 文件上传,但我无法弄清楚如何使用它,尤其是在 serveResource 方法中。我在javax.portlet.GenericPortlet:processAction
中找到了很多文件上传的例子,但在serveResource
中没有。例如,我如何使用简单的
boolean isMultipart = PortletFileUpload.isMultipartContent(request);
在我的serveResource
方法中?
最后我自己找到了解决方案。
import java.io.File;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.ResourceBundle;
import javax.portlet.PortletRequest;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadBase;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.fileupload.servlet.ServletRequestContext;
public class MyPortlet extends GenericPortlet {
@Override
public void serveResource(ResourceRequest request, ResourceResponse resourceResponse) throws PortletException, IOException {
final HttpServletRequest originalHttpServletRequest = portalService.getOriginalHttpServletRequest(request);
final boolean multipartContent = FileUploadBase.isMultipartContent(new ServletRequestContext(originalHttpServletRequest));
if (multipartContent) {
// Create a factory for disk-based file items
DiskFileItemFactory factory = new DiskFileItemFactory();
// Set factory constraints
factory.setSizeThreshold(yourMaxMemorySize);
factory.setRepository(yourTempDirectory);
// Create a new file upload handler
ServletFileUpload upload = new ServletFileUpload(factory);
// Set overall request size constraint
upload.setSizeMax(yourMaxRequestSize);
List<FileItem> items = upload.parseRequest(originalHttpServletRequest);
// Process the uploaded items
Iterator<FileItem> iter = items.iterator();
while (iter.hasNext()) {
FileItem thisItem = (FileItem) iter.next();
final String fieldName = thisItem.getFieldName();
// if an element is a form field
if (thisItem.isFormField()) {
if (fieldName.equals("yourfieldformparam")) {
String value = thisItem.getString();
// Do something with the value
}
} else {
// if its an attachment you can do...
String fileName = item.getName();
String contentType = item.getContentType();
boolean isInMemory = item.isInMemory();
long sizeInBytes = item.getSize();
File fileOut = File.createTempFile(IMieiPagamentiConstants.FILE_PREFIX, null);
// delete on jvm exit
fileOut.deleteOnExit();
// write the file
thisItem.write(fileOut);
//...
}
}
}
}
}
portalService.getOriginalHttpServletRequest(request);
是一种方法,它为您提供特定于门户的 HttpServletRequest 下的资源请求。例如,在Liferay中:
@Override
public HttpServletRequest getOriginalHttpServletRequest(PortletRequest request) {
return PortalUtil.getOriginalServletRequest(getHttpServletRequest(request));
}