类似ＱＱ程序的源码原理！
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代码:(1)用户的基本信息表(表名icq)
序号 字段名 含义 数据类型 NULL
1 Icqno 用户的号码 Int No
2 Nickname 用户的呢称 Char No
3 Password 用户的密码 Char No
4 Status 用户在线否 Bit No
5 Ip 用户的IP地址 Char Yes
6 Info 用户的资料 Varchar Yes
7 Pic 用户的头像号 Int Yes
8 Sex 用户性别 Char Yes
9 Email 用户的email Char Yes
10 Place 用户的籍贯 Char yes
其中Icqno字段为自动增加。（其他还可以添加诸如电话号码等字段作为更多选择）
（2）用户的好友表（表名friend）
序号 字段名 含义 数据类型 NULL
1 Icqno 用户的号码 Int No
2 Friend 好友的号码 Int No
1. 服务器程序:
服务器与客户间通过套接口Socket(TCP)连接。
在java中使用套接口相当简单，Java API为处理套接口的通信提供了一个类java.net.Socket.
,使得编写网络应用程序相对容易．服务器采用多线程以满足多用户的请求，通过JDBC与后台数据库连接，
并通过创建一个ServerSocket对象来监听来自客户的连接请求，默认端口为8080，
然后无限循环调用accept()方法接受客户程序的连接
服务器程序代码如下：(部分)
import java.io.*;
import java.net.*;
import java.sql.*;
import java.util.Vector;
class ServerThread extends Thread{//继承线程
private Socket socket;//定义套接口
private BufferedReader in;//定义输入流
private PrintWriter out;//定义输出流
int no;//定义申请的jicq号码
public ServerThread(Socket s) throws IOException {//线程构造函数
socket=s;//取得传递参数
in=new BufferedReader(new InputStreamReader(socket.getInputStream()));//创建输入流
out=new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())),true);//创建输出流 start();//启动线程
}
public void run(){//线程监听函数
try{
while(true)
{ String str=in.readLine();//取得输入字符串
if(str.equals("end")) break;//如果是结束就关闭连接
else if(str.equals("login"))
{//如果是登录
try{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");//连接数据库
Connection c=DriverManager.getConnection("jdbc:odbc:javaicq"," "," ");
String sql="select nickname,password from icq where icqno=?"; //准备从数据库选择呢称和密码 PreparedStatement prepare=c.prepareCall(sql);//设定数据库查寻条件
String icqno=in.readLine();
int g=Integer.parseInt(icqno);//取得输入的jicq号码
System.out.println(icqno);
String passwd=in.readLine().trim();//取得输入的密码
System.out.println(passwd);
prepare.clearParameters();
prepare.setInt(1,g);//设定参数
ResultSet r=prepare.executeQuery();//执行数据库查寻
if(r.next())
{//以下比较输入的号码于密码是否相同
String pass=r.getString("password").trim();
System.out.println(pass);
if(passwd.regionMatches(0,pass,0,pass.length())){
out.println("ok");
//如果相同就告诉客户ok//并且更新数据库用户为在线
//以及注册用户的ip 地址 //*************register ipaddress
String setip="update icq set ip=? where icqno=?";
PreparedStatement prest=c.prepareCall(setip);
prest.clearParameters();
prest.setString(1,socket.getInetAddress().getHostAddress());
prest.setInt(2,g); int set=prest.executeUpdate();
System.out.println(set); //*************ipaddress //set status online
String status="update icq set status=1 where icqno=?";
PreparedStatement prest2=c.prepareCall(status);
prest2.clearParameters();
prest2.setInt(1,g);
int set2=prest2.executeUpdate();
System.out.println(set2); //set online
}//否者告诉客户失败
else out.println("false");r.close();c.close();}
else{ out.println("false");
System.out.println("false"); r.close(); c.close();} }
catch (Exception e){e.printStackTrace();}
socket.close(); }//end login //登录结束 //以下为处理客户的新建请求
else if(str.equals("new")){
try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
//连接数据库
Connection c2=DriverManager.getConnection("jdbc:odbc:javaicq"," "," ");
String newsql="insert into icq(nickname,password,email,info,place,pic) values(?,?,?,?,?,?)";
//准备接受用户的呢称，密码，email，个人资料，籍贯，头像等信息
PreparedStatement prepare2=c2.prepareCall(newsql);
String nickname=in.readLine().trim();
String password=in.readLine().trim();
String email=in.readLine().trim();
String info=in.readLine().trim();
String place=in.readLine().trim();
int picindex=Integer.parseInt(in.readLine());
prepare2.clearParameters();
prepare2.setString(1,nickname);
prepare2.setString(2,password);
prepare2.setString(3,email);
prepare2.setString(4,info);
prepare2.setString(5,place);
prepare2.setInt(6,picindex);
int r3=prepare2.executeUpdate();//执行数据库添加
String sql2="select icqno from icq where nickname=?";//以下告诉客户其注册的号码
PreparedStatement prepare3=c2.prepareCall(sql2);
prepare3.clearParameters();
prepare3.setString(1,nickname);
ResultSet r2=prepare3.executeQuery();
while(r2.next()){ //
out.println(r2.getInt(1));
no=r2.getInt(1);
System.out.println(no); }
out.println(no);
out.println("ok");
c2.close();//完毕 }
catch (Exception e){
e.printStackTrace();
out.println("false");}
socket.close(); }//end new //新建用户结束 //以下处理用户查找好友
else if(str.equals("find")){
try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection c3=DriverManager.getConnection("jdbc:odbc:javaicq"," "," ");
//以下连接数据库，并且返回其他用户的呢称，性别，籍贯，个人资料等信息
String find="select nickname,sex,place,ip,email,info from icq";
Statement st=c3.createStatement();
ResultSet result=st.executeQuery(find);
while(result.next()){
out.println(result.getString("nickname"));
out.println(result.getString("sex"));
out.println(result.getString("place"));
out.println(result.getString("ip"));
out.println(result.getString("email"));
out.println(result.getString("info")); }//while end
out.println("over"); ////////GET ICQNO
int d,x;boolean y;
//以下返回用户的jicq号码，头像号，及是否在线
ResultSet iset=st.executeQuery("select icqno,pic,status from icq");
while(iset.next()){
d=iset.getInt("icqno");
out.println(d);
x=iset.getInt("pic");//pic info
out.println(x);
y=iset.getBoolean("status");
if (y){out.println("1");}
else {out.println("0");} //
System.out.println(d); } // end send jicqno
iset.close(); /////////icqno end
c3.close();
result.close(); }
catch (Exception e){
e.printStackTrace();
System.out.println("false");} //socket.close(); }//end find
//查找好友结束 //以下处理用户登录时读取其好友资料
else if(str.equals("friend")){
try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection c4=DriverManager.getConnection("jdbc:odbc:javaicq"," "," ");
//以下连接好友表，返回用户的好友名单
String friend="select friend from friend where icqno=?";
PreparedStatement prepare4=c4.prepareCall(friend);
prepare4.clearParameters();
int icqno=Integer.parseInt(in.readLine());
System.out.println(icqno);
prepare4.setInt(1,icqno);
ResultSet r4=prepare4.executeQuery();
Vector friendno=new Vector();//该矢量保存好友号码
while(r4.next()){
friendno.add(new Integer(r4.getInt(1))); } //read friend info
//以下告诉客户其好友的呢称，号码，ip地址，状态，头像，个人资料等信息
out.println(friendno.size());
for(int i=0;i String friendinfo="select nickname,icqno,ip,status,pic,email,info from icq where icqno=?";
PreparedStatement prepare5=c4.prepareCall(friendinfo);
prepare5.clearParameters();
prepare5.setObject(1,friendno.get(i));
ResultSet r5=prepare5.executeQuery();
boolean status;
while(r5.next()){
out.println(r5.getString("nickname"));
out.println(r5.getInt("icqno"));
out.println(r5.getString("ip"));
status=r5.getBoolean("status");
if (status) out.println("1");
else {out.println("0");}
out.println(r5.getInt("pic"));
out.println(r5.getString("email"));
out.println(r5.getString("info")); } //while
r5.close();}//for//发送完毕
out.println("over");
System.out.println("over");
c4.close();
r4.close(); }
catch (Exception e){
e.printStackTrace();
System.out.println("false");} //socket.close(); }//end friend //读取好友信息完毕
//以下处理用户添加好友
else if(str.equals("addfriend")){
System.out.println("add");
try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection c6=DriverManager.getConnection("jdbc:odbc:javaicq"," "," "); //连接数据库，根据接受的用户号码及好友号码向好友表添加记录
int friendicqno=Integer.parseInt(in.readLine());
System.out.println(friendicqno);
int myicqno=Integer.parseInt(in.readLine());
System.out.println(myicqno);
String addfriend="insert into friend values(?,?)";
PreparedStatement prepare6=c6.prepareCall(addfriend);
prepare6.clearParameters();
prepare6.setInt(1,myicqno);
prepare6.setInt(2,friendicqno);
int r6=0; r6=prepare6.executeUpdate();
if(r6==1) System.out.println("ok addfrien");
else System.out.println("false addfriend"); }
catch (Exception e){
e.printStackTrace();
System.out.println("false");} //socket.close();
System.out.println("over addfriend"); }//end addfriend //用户添加好友结束 //add new friend who add me
//以下处理其他用户如果加我，我就加他
else if(str.equals("addnewfriend")){
System.out.println("add");
try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection c6=DriverManager.getConnection("jdbc:odbc:javaicq"," "," "); //连接数据库，根据接受的用户号码及好友号码向好友表添加记录
int friendicqno=Integer.parseInt(in.readLine());
System.out.println(friendicqno);
int myicqno=Integer.parseInt(in.readLine());
System.out.println(myicqno);
String addfriend="insert into friend values(?,?)";
PreparedStatement prepare6=c6.prepareCall(addfriend);
prepare6.clearParameters();
prepare6.setInt(1,myicqno);
prepare6.setInt(2,friendicqno);
int r6=0;
r6=prepare6.executeUpdate();
if(r6==1) System.out.println("ok addfrien");
else System.out.println("false addfriend");
String friendinfo="select nickname,icqno,ip,status,pic,email,info from icq where icqno=?"; //如果成功，就向用户传递好友的基本信息，比如呢称等
PreparedStatement prepare5=c6.prepareCall(friendinfo);
prepare5.clearParameters();
prepare5.setInt(1,friendicqno);
ResultSet r5=prepare5.executeQuery();
boolean status;
while(r5.next()){
System.out.println("dsf");
out.println(r5.getString("nickname"));
out.println(r5.getInt("icqno"));
out.println(r5.getString("ip"));
status=r5.getBoolean("status");
if (status) out.println("1");
else {out.println("0");}
out.println(r5.getInt("pic"));
out.println(r5.getString("email"));
out.println(r5.getString("info")); } //while out.println("over"); r5.close(); c6.close(); }
catch (Exception e){
e.printStackTrace();
System.out.println("false");}
System.out.println("over addnewfriend"); }//end addfriend //结束处理其他用户如果加我，我就加他
//delete friend //以下执行用户删除好友
else if(str.equals("delfriend")){
System.out.println("del");
try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection c7=DriverManager.getConnection("jdbc:odbc:javaicq"," "," "); //连接数据库，根据接受的用户号码及好友号码向好友表删除记录
int friendicqno=Integer.parseInt(in.readLine());
System.out.println(friendicqno);
int myicqno=Integer.parseInt(in.readLine());
System.out.println(myicqno);
String addfriend="delete from friend where icqno=? and friend=?";
PreparedStatement prepare7=c7.prepareCall(addfriend);
prepare7.clearParameters();
prepare7.setInt(1,myicqno);
prepare7.setInt(2,friendicqno);
int r7=0;
r7=prepare7.executeUpdate();
if(r7==1) System.out.println("ok delfrien");//成功
else System.out.println("false delfriend");//失败
}
catch (Exception e){e.printStackTrace();System.out.println("del false");}
}//end delete friend //执行用户删除好友结束 //以下处理用户退出程序
else if(str.equals("logout")){
try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection c8=DriverManager.getConnection("jdbc:odbc:javaicq"," "," "); //连接数据库，根据接受的用户号码，将其状态字段设为0，及ip地址设为空
int myicqno=Integer.parseInt(in.readLine());
System.out.println(myicqno);
String status="update icq set status=0 , ip=′ ′ where icqno=?";
PreparedStatement prest8=c8.prepareCall(status);
prest8.clearParameters();
prest8.setInt(1,myicqno);
int r8=prest8.executeUpdate();
if(r8==1) System.out.println("ok logout");
else System.out.println("false logout"); }
catch (Exception e){e.printStackTrace();System.out.println("logout false");}
}//logout end //处理用户退出程序结束 //get who add me as friend
//以下处理那些人加了我为好友，以便上线通知他们
else if(str.equals("getwhoaddme")){
System.out.println("getwhoaddme");
try{ Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection c9=DriverManager.getConnection("jdbc:odbc:javaicq"," "," "); //连接数据库，根据我的号码，从好友表中选择谁加了我
int myicqno=Integer.parseInt(in.readLine());
System.out.println(myicqno);
String getwhoaddme="select icqno from friend where friend=?";
PreparedStatement prepare6=c9.prepareCall(getwhoaddme);
prepare6.clearParameters();
prepare6.setInt(1,myicqno);
ResultSet r6=prepare6.executeQuery();
Vector who=new Vector();
while(r6.next()){ who.add(new Integer(r6.getInt(1))); }//end while //然后告诉这些好友的ip地址，然后发给用户以便告诉其他客户我上线了
for(int i=0;i { String whoinfo="select ip from icq where icqno=? and status=1";
PreparedStatement prepare=c9.prepareCall(whoinfo);
prepare.clearParameters();
prepare.setObject(1,who.get(i));
ResultSet r=prepare.executeQuery();
while(r.next()){ out.println(r.getString("ip"));} //while
r.close(); }//for
out.println("over");
System.out.println("over");
c9.close();
r6.close(); }
catch (Exception e)
{e.printStackTrace();System.out.println("false");}
}//end get who add me as friend //处理上线结束
System.out.println("Echo ing :"+str); }
System.out.println("Close..."); }
catch(IOException e){}//捕或异常
finally {try{socket.close();}
catch(IOException e){} } }}
public class Server
{//主服务器类
public static void main(String args[])
throws IOException{ ServerSocket s=new ServerSocket(8080);//在8080端口创建套接口
System.out.println("Server start.."+s);
try{
while(true)
{Socket socket=s.accept();//无限监听客户的请求
System.out.println("Connectino accept:"+socket);
try{new ServerThread(socket);}//创建新线程
catch(IOException e){socket.close();}
}
}
finally{s.close();}//捕或异常
}
}//服务器程序结束