downloadfileaction.java

负责公文的传输及一些处理功能

//Created by MyEclipse Struts
// XSL source (default): platform:/plugin/com.genuitec.eclipse.cross.easystruts.eclipse_4.1.1/xslt/JavaClass.xsl

package com.example.web.action;

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

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import javax.servlet.*;
import java.io.*;
import com.example.gw.attachment.Attachment;
import com.example.gw.attachment.IAttachmentManager;

/** 
 * MyEclipse Struts
 * Creation date: 08-02-2007
 * 
 * XDoclet definition:
 * @struts.action validate="true"
 */
public class DownLoadFileAction extends Action {
	
	private String uploadPath;
	
	public void setUploadPath(String uploadPath){
		this.uploadPath = uploadPath;
	}
	
	public String getUploadPath(){
		return uploadPath;
	}
	
	private IAttachmentManager attachmentManager;
	
	public void setAttachmentManager(IAttachmentManager attachmentManager){
		this.attachmentManager = attachmentManager;
	}
	
	public IAttachmentManager getAttachmentManager(){
		return attachmentManager;
	}


	
	public static final String path_fgf =  File.separator;
	
	// --------------------------------------------------------- Instance Variables

	// --------------------------------------------------------- Methods

	/** 
	 * Method execute
	 * @param mapping
	 * @param form
	 * @param request
	 * @param response
	 * @return ActionForward
	 */
	public ActionForward execute(ActionMapping mapping,ActionForm form,HttpServletRequest request,HttpServletResponse response)throws IOException {
	    ServletOutputStream outw= response.getOutputStream();
	    try{
	        String fileId=request.getParameter("fileId");
	        String mimeType = "";
	        String title = "";
	        String path = "";
	        String itemId = "";
	        String fileName = "";
	        Attachment dow=(Attachment)attachmentManager.getAttachment(fileId);
		    mimeType = dow.getMimeType();
		    title = dow.getTitle();
		    path = dow.getPath();
		    itemId = dow.getItemId().toString();
		    fileName = dow.getFileName();
	        response.setContentType(mimeType);
	        response.setHeader("Content-Disposition","attachment;filename=\"" +new String(title.getBytes(),"iso-8859-1") + "\"");
	        FileInputStream inp = new FileInputStream(getUploadPath() + path + itemId + path_fgf + fileName);
	        int i;
	        byte [] buffer = new byte[1024];
	        while ( (i = inp.read(buffer)) != -1) {
	            outw.write(buffer, 0, i);
	        }
	        inp.close();
	        outw.flush();
	    }catch (Exception e){
	         e.printStackTrace();
	    }finally{
	        outw.close();
	    }
		// TODO Auto-generated method stub
		return null;
	}

}