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JSP高访问量下的计数程序

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有时要为每一篇文章统计其点击次数,如果每一次浏览都要更新一次库的话,那性能在访问量很大的情况下,服务器的压力就会很大了,比较好一点的方法就是先将要更新的数据缓存起来,然后每隔一段时间再利用数据库的批量处理,批量更新库。源码如下: c nV2}U/\  
f >\~h,SLL  
  CountBean.java 6/L34VH  
] U[4r9V  
/* oo!JAv}~  
* CountData.java [L>AU; :  
* Ba;tEF{X  
* Created on 2007年1月1日, 下午4:44 lkgB,cflpi  
* Yf x'7gj  
* To change this template, choose Tools | Options and locate the template under Us8nOr>5  
* the Source Creation and Management node. Right-click the template and choose ?rgtbiSW-  
* Open. You can then make changes to the template in the Source Editor. (e[8`C  
*/ f_tC:T4a  
7gT^ZL  
  package com.tot.count; stlkt>9  
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/** 5=P*<Dnj  
* (rjv3=9\3  
* @author n7'X.=o7  
*/  76EMS?e  
public class CountBean { >3y:cPTM5  
 private String countType; !a9/8U_>XF  
 int countId; E% \Ohs7  
 /** Creates a new instance of CountData */ Np R&`]  
 public CountBean() {} ykG^(.E  
 public void setCountType(String countTypes){ hSSFmEpr  
  this.countType=countTypes; -<aN$O  
 } DsGtc<l%  
 public void setCountId(int countIds){ hx sW9  
  this.countId=countIds; <qCfw>%2F  
 } 7bx!A+, t  
 public String getCountType(){ |j7{zsH  
  return countType; 0uf)6(f  
 } 0-zIohSJdQ  
 public int getCountId(){ lag%} ^  
  return countId; O `a4 ")R  
 } ^es/xt  
} TllIs&MCe  
!"N-To-c  
  CountCache.java VAZ6;3@cd  
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/* SFa~j)9'n  
* CountCache.java g;G.uF&  
* !Ytr4DtM  
* Created on 2007年1月1日, 下午5:01 dO\irv)  
* nL&[R}@W  
* To change this template, choose Tools | Options and locate the template under f;%\4TH?  
* the Source Creation and Management node. Right-click the template and choose #N `Z)}Jm  
* Open. You can then make changes to the template in the Source Editor. ffS]%qa  
*/ Y'2 |GJc2  
Fs;_z9ej-u  
package com.tot.count; yX|0 R H  
import java.util.*; +(J{~A~  
/** F<A[S "  
* H6]z98  
* @author +umVl  
*/ by0M(h  
public class CountCache { D]$X@2A  
 public static LinkedList list=new LinkedList(); ,.&y-?  
 /** Creates a new instance of CountCache */ jsnk*>j  
 public CountCache() {} haIH `S Y  
 public static void add(CountBean cb){ UqsX@jL!  
  if(cb!=null){ o-%DL*^5  
   list.add(cb); FTC,{$  
  } JO"-"&>  
 } sc &S0K  
} e-e*%  
,xsFBNCC  
 CountControl.java @EzO bE{  
2/V9Or 52  
 /* O #S27.  
 * CountThread.java gN/6%,H}  
 * 2';f8JLY  
 * Created on 2007年1月1日, 下午4:57 .@(9v.:_u  
 * fI1,L"  
 * To change this template, choose Tools | Options and locate the template under !_My]>S  
 * the Source Creation and Management node. Right-click the template and choose ]-G10p}Ph-  
 * Open. You can then make changes to the template in the Source Editor. !L_\6;aP,x  
 */ tgB\;nbB  
[agp06 $D?  
package com.tot.count; "OO"Ab{t  
import tot.db.DBUtils; l9Sx'<  
import java.sql.*; $M 1/74  
/** cq \()uF'c  
* p8a \> {  
* @author 1dahVc1W  
*/ 2[R{IV8e  
public class CountControl{ _0(Bx?[h  
 private static long lastExecuteTime=0;//上次更新时间  Pf?y!d K<  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ^&6'FE  
 /** Creates a new instance of CountThread */ \<K@t=/ 6  
 public CountControl() {} UN6Du\)]d  
 public synchronized void executeUpdate(){ c>nXnN  
  Connection conn=null; NRgNW1#  
  PreparedStatement ps=null; pv #uLo  
  try{ j[<}l&  
   conn = DBUtils.getConnection(); U$5 lh  
   conn.setAutoCommit(false); WGeTL`}dh  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); bI?YNt,  
   for(int i=0;i<CountCache.list.size();i++){ 1rmK#ld"=Z  
    CountBean cb=(CountBean)CountCache.list.getFirst(); vkQkU,q  
    CountCache.list.removeFirst(); c3$h-M(jVJ  
    ps.setInt(1, cb.getCountId()); V"{+cPBO)  
    ps.executeUpdate();⑴ uNSbAw3  
    //ps.addBatch();⑵ dJ}E,rW}  
   } 4PzCm k  
   //int [] counts = ps.executeBatch();⑶ DoA+Bwq@  
   conn.commit(); 9dFSppM  
  }catch(Exception e){ /?wH1 ,  
   e.printStackTrace(); u!VAAX  
  } finally{ =Vm"2g,aA  
  try{ T2^0Q9E?  
   if(ps!=null) { ZW0gd7Wh  
    ps.clearParameters(); 43 h0i-%1  
ps.close(); xVn"xk  
ps=null; ,AO]4Ec  
  } 42wa9UL<Ka  
 }catch(SQLException e){} EgT2a  
 DBUtils.closeConnection(conn); bijE]:<AE7  
 } ~@wM[}ThP$  
} ^ A`@g4!  
public long getLast(){ O8drR4 Pt  
 return lastExecuteTime; SuU_psF  
} `pzXh0}|  
public void run(){ rL /e  
 long now = System.currentTimeMillis(); 8I`t`C/4  
 if ((now - lastExecuteTime) > executeSep) { |3A/Og  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); a*Oc:$  
  //System.out.print(" now:"+now+"\n"); r)G^V&96  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); TsB"<6@!AA  
  lastExecuteTime=now; "/&_B  
  executeUpdate(); ~Yw`w 2  
 } ZFAi9M  
 else{ ;Xw'WMb*=  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); "+6:vhP5  
 } W+C@(}pt  
} ]'2;6%. 4  
} SCZ6:P"$qX  
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 ~K-c-Zs#z  
8> -3G  
  类写好了,下面是在JSP中如下调用。 o"a~  
[o0Z; }fU  
<% {T0f]]}Q  
CountBean cb=new CountBean(); K9YD)351t  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); cJnAwIs_e`  
CountCache.add(cb); IP]"D"  
out.print(CountCache.list.size()+"<br>"); 8 N5ga  
CountControl c=new CountControl(); Q8kdX6NMd&  
c.run(); ^gK8 u]>  
out.print(CountCache.list.size()+"<br>"); Wp[R$/uT  
%>
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