saveupdatems.java

一个相对比较简单的留言簿！功能还比较齐全！

package com.pure35.servlet;

import java.io.IOException;

import java.sql.Date;

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

import com.pure35.bean.SqlDate;
import com.pure35.database.MessageDao;
import com.pure35.vo.MessageVo;

public class SaveUpdateMs extends HttpServlet {

	private static final long serialVersionUID = 1L;

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		request.setCharacterEncoding("GBK");	
		//取得登陆用户信息
		
		HttpSession session=request.getSession();
		String  user=(String) session.getAttribute("userName");
		if(user==null){
			
			request.getRequestDispatcher("login.jsp").forward(request, response);
		}
		//
		//得到用户提交留言信息
		String myid=request.getParameter("id");
		int mid=Integer.parseInt(myid);
		String subject=request.getParameter("subject");
		String content=request.getParameter("content");
		//获得提交时间
		Date mdate=SqlDate.getSqlDate();
		
		//把信息封装到MessageVo
		MessageVo message=new MessageVo();
		message.setId(mid);
		message.setContent(content);
		message.setMdate(mdate);
		message.setSubject(subject);
		message.setUsername(user);		
		
		//把信息写入数据库
		MessageDao mesdao=new MessageDao();
		boolean result=mesdao.updateMessage(message);
		
		String id=(String) request.getAttribute("id");
		
		if(result)
		{	
			//成功后跳转到留言显示页面
			request.getRequestDispatcher("/ShowMessage").forward(request, response);
		}
		else
		{
			//失败将设置该留言信息的id并跳转到修改页面
			request.setAttribute("id", id);
			request.getRequestDispatcher("/UpdateMessage").forward(request, response);
		}
	}
}