自己在公司網站開發總用DWR開發的一個簡單聊天
本人也是在網站開發地圖時有到了這個技術，剛學習DWR半個月
就把隨手寫的一個簡單聊天來給大家共享，切磋一下。
由于考慮到某些局部原因，只發表了一些重要技術方面的資料，沒有把全部東西共享。請個人體諒。
由于DWR2.0有個Bug ，我用的DWR1.0，但是，它必須用JDK1.4
dwr.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN" "<dwr>
? <init></init>
? <allow>
?<create creator="new" javascript="CityChatsend" scope="session">
????? <param name="class" value="com.aaa.CharChat.DWR.DWRCityChar_send"/>
????? <include method="Chat_send"/>?
??? </create>
?<create creator="new" javascript="CityChatRead" scope="session">
????? <param name="class" value="com.aaa.CharChat.DWR.DWRCityChar_Read"/>
????? <include method="ChatRead"/>?
??? </create>
?<create creator="new" javascript="CityChatInit" scope="application">
????? <param name="class" value="com.aaa.CharChat.DWR.DWRCityChar_Init"/>
????? <include method="getNew_Old"/>
?? <include method="setNew_Old"/>?
??? </create>
? </allow>
</dwr>
DWRCityChar_send JAVA文件
package com.aaa.CharChat.DWR;
import java.sql.*;
import java.util.*;
import com.db.DatabaseConnection;
import com.aaa.CharChat.initSQL.CityChart_InitSQL;
import java.util.Date;
import java.text.SimpleDateFormat;
/**
?*Title? : 魅力城市聊天保存初始變量
?*Author : JAVA^_^梟龍---孫德華
?*Project: 數字城市
?*Date?? : 2006-09-9
?**/
?
public class DWRCityChar_Init
{
?private static int now_ChatId=0;
?private static String InitSay="[公告^_^]:歡迎大家入住魅力城市^_^";
?private static String InitError="[公告^_^]:對不起！系統故障！我們會盡快解決！";
?private static String New_Old="0";
?public static String getInitError()
?{
??return InitError;
?}
?public static String getNew_Old()
?{
??return New_Old;
?}
?public static void setNew_Old()
?{
??New_Old="0";
?}
?public static synchronized void setInitSay(String Say)
?{
??InitSay=Say;
?}
?public static synchronized int getnow_ChatId()
?{
??if(now_ChatId==0)
??{
???int temp_ID=getRenow_ChatId();
???if(temp_ID>0)
???{
????setnow_ChatId(temp_ID);
???}else
???{
????startnewChat();?
???}
??}
??New_Old="1";//加載聊天記錄
??return now_ChatId;
?}
?public static synchronized void setnow_ChatId(int ChatId)
?{
??now_ChatId=ChatId;
?}
?public static synchronized void startnewChat()
?{
??Connection conn=null;
???? PreparedStatement prepare=null;
???? try
???? {
???? conn=DatabaseConnection.getConnection();
???? prepare=conn.prepareStatement(CityChart_InitSQL.getinsertnewChat());
???? Date online=new Date();
?? ???? SimpleDateFormat fo=new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
??????? String riqi=fo.format(online);
??????? prepare.setString(1,riqi);
??????? prepare.setString(2,InitSay);
??????? int result=prepare.executeUpdate();
??????? if(result>0)
??????? {
??????? ?setnow_ChatId(result);
??????? }
??????? else
??????? {
??????? ?startnewChat();
??????? }
??????? prepare.close();
??????? conn.close();
???? }catch(Exception we)
???? {
???????? System.out.println(we.getMessage());
???? }finally
???? {
????????? try
???? ?{
???? ?if(!conn.isClosed())
???? ?{
???? ?prepare.close();
???? ?conn.close();
???? ?}?
???? ?}
???? ?catch(Exception ew)
???? ?{
???? ?}
???? }
?}
?public static int getRenow_ChatId()
?{
?Connection conn=null;
??? PreparedStatement prepare=null;
??? ResultSet result=null;
??? int Return=0;
??? try
??? {
??? conn=DatabaseConnection.getConnection();
??? prepare=conn.prepareStatement(CityChart_InitSQL.getselectnewChatId());
??? result=prepare.executeQuery();
??? if(result.next())
??? {
??? ?Return=result.getInt("Id");
??? }
??? result.close();
??? prepare.close();
??? conn.close();
??? }catch(Exception we)
??? {
??? ?Return=-1;
??????? System.out.println(we.getMessage());
??? }finally
??? {
????????? try
??? ?{
??? ?if(!conn.isClosed())
??? ?{
??? ?prepare.close();
??? ?conn.close();
??? ?}?
??? ?}
??? ?catch(Exception ew)
??? ?{
??? ?}
??? }
??? return Return;?
?}
}
DWRCityChar_send JAVA文件
package com.aaa.CharChat.DWR;
import java.sql.*;
import java.util.*;
import com.db.DatabaseConnection;
import com.aaa.CharChat.DWR.DWRCityChar_Init;
import com.aaa.CharChat.initSQL.CityChart_InitSQL;
/**
?*Title? : 魅力城市聊天發送
?*Author : JAVA^_^梟龍---孫德華
?*Project: 數字城市
?*Date?? : 2006-9-9
?**/
public class DWRCityChar_send
{
?public int Chat_send(String User_name,String Content)
?{
??int Return=0;
??try
??{
??String result="["+User_name+"]說:"+Content;
??int nowId=DWRCityChar_Init.getnow_ChatId();
??
??if(nowId>0)
??{
???Return=dosend(nowId,result);
??}else
??{
???Return=-2;
??}
??}catch(Exception we)
??{
???
??}
??return Return;
?}
?public int dosend(int nowId,String result)
?{
??Connection conn=null;
???? PreparedStatement prepare=null;
???? PreparedStatement prepare1=null;
???? ResultSet resu=null;
???? String Content="";
???? int Return=0;
???? try
???? {
???? conn=DatabaseConnection.getConnection();
???? prepare=conn.prepareStatement(CityChart_InitSQL.getselectChatbyId());
???? prepare1=conn.prepareStatement(CityChart_InitSQL.getupdateChatbyId());
???? prepare.setInt(1,nowId);
???? resu=prepare.executeQuery();
???? if(resu.next())
???? {
???? ?Content=resu.getString("Content");
???? }
???? resu.close();
???? prepare.close();
???? if(Content.length()>4000)
???? {
???? DWRCityChar_Init.startnewChat();
???? nowId=DWRCityChar_Init.getnow_ChatId();?
???? }
???? Content=result+"\n"+Content;
???? prepare1.setString(1,Content);
???? prepare1.setInt(2,nowId);
???? Return=prepare1.executeUpdate();
???? prepare1.close();
???? conn.close();
???? }catch(Exception we)
???? {
???? ?Return=-1;
???????? System.out.println(we.getMessage());
???? }finally
???? {
?????????? try
???? ?{
???? ?if(!conn.isClosed())
???? ?{
???? ?prepare.close();
???? ?prepare1.close();
???? ?conn.close();
???? ?}?
???? ?}
???? ?catch(Exception ew)
???? ?{
???? ?}
???? }
???? return Return;
?}
}
DWRCityChar_Read java文件
package com.aaa.CharChat.DWR;
import java.sql.*;
import java.util.*;
import com.db.DatabaseConnection;
import com.aaa.CharChat.DWR.DWRCityChar_Init;
import com.aaa.CharChat.initSQL.CityChart_InitSQL;
/**
?*Title? : 魅力城市聊天發送
?*Author : JAVA^_^梟龍---孫德華
?*Project: 數字城市
?*Date?? : 2006-9-9
?**/
public class DWRCityChar_send
{
?public int Chat_send(String User_name,String Content)
?{
??int Return=0;
??try
??{
??String result="["+User_name+"]說:"+Content;
??int nowId=DWRCityChar_Init.getnow_ChatId();
??
??if(nowId>0)
??{
???Return=dosend(nowId,result);
??}else
??{
???Return=-2;
??}
??}catch(Exception we)
??{
???
??}
??return Return;
?}
?public int dosend(int nowId,String result)
?{
??Connection conn=null;
???? PreparedStatement prepare=null;
???? PreparedStatement prepare1=null;
???? ResultSet resu=null;
???? String Content="";
???? int Return=0;
???? try
???? {
???? conn=DatabaseConnection.getConnection();
???? prepare=conn.prepareStatement(CityChart_InitSQL.getselectChatbyId());
???? prepare1=conn.prepareStatement(CityChart_InitSQL.getupdateChatbyId());
???? prepare.setInt(1,nowId);
???? resu=prepare.executeQuery();
???? if(resu.next())
???? {
???? ?Content=resu.getString("Content");
???? }
???? resu.close();
???? prepare.close();
???? if(Content.length()>4000)
???? {
???? DWRCityChar_Init.startnewChat();
???? nowId=DWRCityChar_Init.getnow_ChatId();?
???? }
???? Content=result+"\n"+Content;
???? prepare1.setString(1,Content);
???? prepare1.setInt(2,nowId);
???? Return=prepare1.executeUpdate();
???? prepare1.close();
???? conn.close();
???? }catch(Exception we)
???? {
???? ?Return=-1;
???????? System.out.println(we.getMessage());
???? }finally
???? {
?????????? try
???? ?{
???? ?if(!conn.isClosed())
???? ?{
???? ?prepare.close();
???? ?prepare1.close();
???? ?conn.close();
???? ?}?
???? ?}
???? ?catch(Exception ew)
???? ?{
???? ?}
???? }
???? return Return;
?}
}
用到的JAVASCRIPT??? JS文件
/**
?*Title? : 魅力城市聊天
?*Author : JAVA^_^梟龍---孫德華
?*Project: 數字城市
?*Date?? : 2006-09-9
?**/
var Send_state=0;//發送狀態
var Chat_sendTime=500;
var Chat_sendStart;
var Chat_sendEnd;
var Chat_sendstop;
var Chat_result;
var Chat_startWrite;
var Chat_InitStart;
var Chat_Readtime=500;
function Chathotsend()
{
?if(event.keyCode==10)
?{
??ChatSend();
?}
}
function getChat_Content()
{
?var Content=null;
?var obj=document.getElementById('chat_input');//獲取聊天內容
?if(typeof(obj)=='object')
?{
??Content=obj.value;
??if(Content!=null&&Content.length>400)
??{
???alert('對不起！你的聊天內容過長，請你說話要簡練扼要！');
??}
?}else
?{
??Content=null;
??alert('程序內部出現異常，抱歉！我們會盡快解決');
?}
?return Content;
}
function ChatSend()
{
?var UserName="";
?var obj=document.getElementById('Chat_User_name');//獲取聊天內容
?if(typeof(obj)=='object')
?{
??UserName=obj.value;
?}else
?{
??UserName==null;
??alert('程序內部出現異常，抱歉！我們會盡快解決');
??return;
?}
?var Content=getChat_Content();
?if(Content==null||Content=='')
?{
??ShowAlert('請您輸入聊天內容！');
??alert_time=setTimeout('ShowAlertCLose()',alert_showtime);
??alert('請您輸入聊天內容！');
??return;
?}
?Chat_sendstop=setTimeout('ShowAlert()',Chat_sendTime);
?doChatSend(UserName,Content);
?var chatobj=document.getElementById('chat_input');
?chatobj.value='';
?chatobj.focus();
?
?
}
function doChatSend(UserName,Content)//聊天發送
{
?Chat_sendStart=new Date();
?CityChatsend.Chat_send(UserName,Content,Chat_doResult);
}
function Chat_doResult(Return)//結果顯示
{
?Send_state=Return;
?Chat_sendEnd=new Date();
?var temp=Chat_sendEnd-Chat_sendStart;
?if(temp>50)
?{
??Chat_sendTime=temp;
?}
}
function ShowAlert()
{
?clearTimeout(Chat_sendstop);
?if(Send_state==-1)
?{
??alert('聊天提交時，出現數據庫插入異常！抱歉！請你重新輸入');
?}else if(Send_state==-2)
?{
??alert('對不起！聊天系統出現異常，給你帶來不便。在此，我代表AAA國際向你表示抱歉……');
?}
}
function ChatInit()
{
?setInterval('ChatRead()',Chat_Readtime);
}
function ChatRead()
{
?var chat_updiv=document.getElementById('chat_input_updiv');
?if(chat_updiv.style.display=='')
?{
?CityChatRead.ChatRead(getChatContent);
?Chat_startWrite=setTimeout('WriteChatContent()',1000);
?}
}
function WriteChatContent()
{
?clearTimeout(Chat_startWrite);
?var obj=document.getElementById('chat_content');
?if(typeof(obj)=='object')
?{
?if(Chat_result!=null&&Chat_result!='')
?{
??obj.value=Chat_result;
?}else
?{
??obj.value='數據加載中......';
?}
?}else
?{
??alert('程序內部出現異常，抱歉！我們會盡快解決');
?}
?Chat_result=null;
}
function getChatContent(result)
{
?Chat_result=result;
}