speak.java

一个简单的局域网网聊天程序 用Eclipse编写 数据库为SQL Server2

package com.xj.serv;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Calendar;
import java.util.Date;

import javax.servlet.ServletContext;
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.xj.bean.StringBufferClass;

public class speak extends HttpServlet {
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doPost(request, response);
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html;charset=gb2312");
		response.setCharacterEncoding("gb2312");
		request.setCharacterEncoding("gb2312");
		String str = request.getParameter("chat");
		if(str.equals(""))
		{
			str ="啥也不说，我是白痴！";
		}
		else
		{
			ServletContext application = getServletContext();
			Object obj=application.getAttribute("message");
			StringBuffer sb;
			if(obj==null)
			{
				sb=new StringBuffer("");
			}
			else
			{
				String s= obj.toString();
				sb=new StringBuffer(s);
			}
			StringBufferClass sbc=new StringBufferClass(sb);
			HttpSession session = request.getSession();
			String username=session.getAttribute("username").toString();
			//Date d = new Date();
			//String time = d.getHours()+":"+d.getMinutes()+":"+d.getSeconds();
			Calendar c = Calendar.getInstance();
			
			String time=c.get(c.HOUR_OF_DAY)+":"+c.get(c.MINUTE)+":"+c.get(c.SECOND);
			String mess="<b>"+username+"("+time+")说：</b>"+str+"<br>";
			sb=sbc.getSb(mess);
			application.setAttribute("message", sb);
		}
		
		
		response.sendRedirect("chat.jsp");
	}

}