downfileaction.java

实现一个J2EE上传功能完整的源代码

package com.action;

import java.io.File;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DownloadAction;
import org.apache.struts.actions.DownloadAction.FileStreamInfo;
import org.apache.struts.actions.DownloadAction.StreamInfo;

public class DownFileAction extends DownloadAction {
	protected StreamInfo getStreamInfo(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		String fileid = request.getParameter("fileid");
		String filename = request.getParameter("filename");
		String filetype = request.getParameter("filetype");
		String endname = filename.substring(filename.indexOf("."));
		String downname = fileid + endname;
		String dirpath = servlet.getServletContext().getRealPath("/file");
		File file = new File(dirpath, downname);
		FileStreamInfo fsi = new FileStreamInfo(filetype, file);
		response.setHeader("Content-disposition", "attachment;filename="
				+ downname);
		return fsi;
	}
}