upload.java

一个JAVA做的博客系统。系统采用JSP + JS + TOMCAT + MYSQL制作。用户能上传图片和音乐到系统中。游客和用户自己能在页面中浏览文件和听歌。

package essay;

import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Vector;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import common.User;

public class Upload extends HttpServlet
{
	public void doPost(HttpServletRequest request, 
		HttpServletResponse response) throws IOException, ServletException
	{
		String type, name, path = "/essay/show.jsp";
		HashMap props = (HashMap)request.getSession().getAttribute("props");
		try
		{
			FileItemFactory factory = new DiskFileItemFactory();
			ServletFileUpload upload = new ServletFileUpload(factory);
			List items = upload.parseRequest(request);
			FileItem fileItem;
			InputStream in;
			Binary b;
			int titleId = (Integer)props.get("titleId");
			for (Iterator i = items.iterator(); i.hasNext();)
			{
				fileItem = (FileItem)i.next();
				if (!fileItem.isFormField())
				{
					in = fileItem.getInputStream();
					type = "a";
					if(fileItem.getContentType().startsWith("image"))
						type = "p";
					name = fileItem.getName();
					name = name.substring(name.lastIndexOf("\\") + 1);
					b = new Binary(name, type);
					b.setTitleId(titleId);
					b.setIs(in);
					EssayOp.paInsert(b);
					fileItem.delete();
				}
			}
			String username = ((User)props.get("user")).getUsername();
			Vector essays = EssayOp.selectAll(titleId, username);
			if(essays != null)
				props.put("essays", essays);
			else
				throw new Exception("essays is null");
		}
		catch(Exception e)
		{
			path = "/common/error.jsp";
			props.put("err", e.getMessage());
		}
		finally
		{
			request.getSession().setAttribute("props", props);
			RequestDispatcher rd = request.getRequestDispatcher(path);
			rd.forward(request, response);
		}
	}
}