这是Java学习的一些常用的例子

				
				
				
				
				
				
				
								    String uid = (String)session.getAttribute("UID");
				    String title = request.getParameter("title");
				    String content = request.getParameter("content");
				    
				    if ((uid==null) || (title==null) || (content==null)) {
				        out.print("添加留言");
				        out.print("");
				        out.print(" 添加失败，无效的系统参数！");
				    } else {
				        message.setTitle(title);
				        message.setContent(content);
				        message.setUser(uid);
				        
				        messageAdmin.setRootPath(application.getRealPath("/data/"));
				        if (messageAdmin.add(message)) {
				            //添加成功，重新显示留言页面
				            response.sendRedirect("msg.jsp");
				        } else {
				            out.print("添加留言");
				            out.print("");
				            out.print(" MessageAmin添加失败！");
				        }
				    }
				%>