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 [DWR(Ajax)]JAVA中DWR开发项目实战经验
软件技术
lhwork 发表于 2006/9/13 14:12:41 |
| 自己在公司网站开发总用DWR开发的一个简单聊天本人也是在网站开发地图时有到了这个技术，刚学习DWR半个月就把随手写的一个简单聊天来给大家共享，切磋一下。由于考虑到某些局部原因，只发表了一些重要技术方面的资料，没有把全部东西共享。请个人体谅。由于DWR2.0有个Bug ，我用的DWR1.0，但是，它必须用JDK1.4dwr.xml文件<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN" "http://www.getahead.ltd.uk/dwr/dwr10.dtd"><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变量 *Author : JAVA^_^枭龙---孙德华 *Project: 数字城市 *Date : 2006-09-9 **/ public class DWRCityChar_Init{ private static int now_ChatId=0; private static String InitSay="[公告^_^]:欢迎大家入住魅力城市^_^"; private static String InitError="[公告^_^]:对不起！系统故障！我们会尽快解决！"; 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";//加载聊天记录 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 : 魅力城市聊天发送 *Author : JAVA^_^枭龙---孙德华 *Project: 数字城市 *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+"]说:"+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 : 魅力城市聊天发送 *Author : JAVA^_^枭龙---孙德华 *Project: 数字城市 *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+"]说:"+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^_^枭龙---孙德华 *Project: 数字城市 *Date : 2006-09-9 **/var Send_state=0;//发送状态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');//获取聊天内容 if(typeof(obj)=='object') { Content=obj.value; if(Content!=null&&Content.length>400) { alert('对不起！你的聊天内容过长，请你说话要简练扼要！'); } }else { Content=null; alert('程序内部出现异常，抱歉！我们会尽快解决'); } return Content;}function ChatSend(){ var UserName=""; var obj=document.getElementById('Chat_User_name');//获取聊天内容 if(typeof(obj)=='object') { UserName=obj.value; }else { UserName==null; alert('程序内部出现异常，抱歉！我们会尽快解决'); return; } var Content=getChat_Content(); if(Content==null||Content=='') { ShowAlert('请您输入聊天内容！'); alert_time=setTimeout('ShowAlertCLose()',alert_showtime); alert('请您输入聊天内容！'); return; } Chat_sendstop=setTimeout('ShowAlert()',Chat_sendTime); doChatSend(UserName,Content); var chatobj=document.getElementById('chat_input'); chatobj.value=''; chatobj.focus(); }function doChatSend(UserName,Content)//聊天发送{ Chat_sendStart=new Date(); CityChatsend.Chat_send(UserName,Content,Chat_doResult);}function Chat_doResult(Return)//结果显示{ 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('聊天提交时，出现数据库插入异常！抱歉！请你重新输入'); }else if(Send_state==-2) { alert('对不起！聊天系统出现异常，给你带来不便。在此，我代表AAA国际向你表示抱歉……'); }}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='数据加载中......'; } }else { alert('程序内部出现异常，抱歉！我们会尽快解决'); } Chat_result=null;}function getChatContent(result){ Chat_result=result;} |
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回复:JAVA中DWR开发项目实战经验
软件技术
初学者(游客)发表评论于2006/10/8 10:12:04 |
| 这个是wap开发的吧？好像没有太复杂的功能，实时性应该不是很强。 |
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