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: HXHPz4
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CountBean.java z n!
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/* fEc_r:|\6
* CountData.java cZzZNGY^ts
* r3_gPK
* Created on 2007年1月1日, 下午4:44 4Z<l>!
* ({VBp[Mh
* To change this template, choose Tools | Options and locate the template under K-C,+ eI
* the Source Creation and Management node. Right-click the template and choose g0OS<,:
* Open. You can then make changes to the template in the Source Editor. ,b(S=r
*/ vxT"BvN
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package com.tot.count; -\$cGIL
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/** 26VdRy{[
* 2H+DT-hK
* @author :t
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*/ walRqlo@
public class CountBean { h}>/Z3*
private String countType; =hOa
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int countId; ZC*d^n]x.
/** Creates a new instance of CountData */ X/Rx]}[
public CountBean() {} KAcri<^G
public void setCountType(String countTypes){ 2rtP.*dd
this.countType=countTypes; PjW+V`
} cEjdImAzU
public void setCountId(int countIds){ $#FlnM<=
this.countId=countIds; }t3FAy(%
} WbWW=(N'd
public String getCountType(){ MxEAs}MDv
return countType; LC\:xia{X
} J8BT%
public int getCountId(){ z8 ;#H
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return countId; -+>r4P
} /B\-DP3K
} dKQV4dc>
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CountCache.java cu`J2vm3
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/* -b0'Q
* CountCache.java PZ(<eJ>
* {ah~q}(P
* Created on 2007年1月1日, 下午5:01 uEGPgYY (
* ,1;8DfVZV
* To change this template, choose Tools | Options and locate the template under +Cg"2~
* the Source Creation and Management node. Right-click the template and choose G=5t5[KC
* Open. You can then make changes to the template in the Source Editor. +Z<Q^5w@
*/ Cj 2Xl
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package com.tot.count; <4e*3WSG
import java.util.*; kok^4VV
/** i!$^NIcJ
* nWF4[<t
* @author UZ\*]mxT
*/ '(X[
w=WXy
public class CountCache { b\;u9C2y'
public static LinkedList list=new LinkedList(); `-EH0'w~"
/** Creates a new instance of CountCache */ |ch^eb^7"
public CountCache() {} G+X[R^RD
public static void add(CountBean cb){ .!8X]trEg
if(cb!=null){ i;hc]fYb=K
list.add(cb); %SO%{.}Zf
} <uKm%~xi<
} T|s0qQi
} Wejwj/EU%
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CountControl.java U%t/wq
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/* .e2A*9,
* CountThread.java %;\G@q_p{
* `$sY^EX
* Created on 2007年1月1日, 下午4:57 1H4Zgh
U
* /3[9{r
* To change this template, choose Tools | Options and locate the template under >`<2}Me6
* the Source Creation and Management node. Right-click the template and choose Fv);5LD
* Open. You can then make changes to the template in the Source Editor. Dp*$GQ
*/ 1:x nD
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package com.tot.count; r%,H*DOu
import tot.db.DBUtils; _/
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import java.sql.*; ]AA%J@
/** uo4$rf7
* bLM"t0
* @author &u1g7#
#
*/ u[i7:V%
public class CountControl{ Lkl|4L
private static long lastExecuteTime=0;//上次更新时间 h [IYA1/y
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 '#N5i
/** Creates a new instance of CountThread */ #jLaIXms
public CountControl() {} _0W;)v
public synchronized void executeUpdate(){ i,IM?+4
Connection conn=null; p + l_MB
PreparedStatement ps=null; 3U~lI&
try{ O GFE*
conn = DBUtils.getConnection(); ~`\9Q
conn.setAutoCommit(false); xe6_RO%
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); E! I
for(int i=0;i<CountCache.list.size();i++){ zzfn0g
CountBean cb=(CountBean)CountCache.list.getFirst(); )jk1S
CountCache.list.removeFirst(); .FKJyzL
ps.setInt(1, cb.getCountId()); xEiX<lguyN
ps.executeUpdate();⑴ =`1m-
//ps.addBatch();⑵ -N7xO)
} W~u
//int [] counts = ps.executeBatch();⑶ f' '{.L
conn.commit(); `B'4"=(
}catch(Exception e){ -H4+ur JJ
e.printStackTrace(); *F
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} finally{ Aa`MK$29F
try{ L8dU(P
if(ps!=null) { lkg"'p{
ps.clearParameters(); ``|gcG
ps.close(); o'eI(@{F=
ps=null; G;Wkm|
} 7V=MRf&xQ
}catch(SQLException e){} EDHg'q
DBUtils.closeConnection(conn); )8$:DW;
} !eR-Kor
} g %\$ !b
public long getLast(){ `8Jq~u6_Z
return lastExecuteTime; Vm~qk
} /esVuz
public void run(){ AbF(MK=i
long now = System.currentTimeMillis(); om}/f`
if ((now - lastExecuteTime) > executeSep) { skI(]BDf
//System.out.print("lastExecuteTime:"+lastExecuteTime); $7UoL,N>
//System.out.print(" now:"+now+"\n"); CQSpPQA
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); -SvTg{Q{la
lastExecuteTime=now; R VkU+7
executeUpdate(); ^`rpf\GX(
} d@4rD}_Z
else{ dd<:#c9
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); pgLtD};S
} V#NG+U.B
} m
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} T A\4uy6o
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 ou'~{-_xd
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类写好了,下面是在JSP中如下调用。 gMs+?SNHAh
i*S|qX7``
<% CGC-"A/W
CountBean cb=new CountBean(); pcy<2UV
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 5{13V*<
CountCache.add(cb); X*!Dc,0.k
out.print(CountCache.list.size()+"<br>"); =`Po<7D
CountControl c=new CountControl(); X(k{-|9]
c.run(); %kh#{*q$
out.print(CountCache.list.size()+"<br>"); Q(510)
%>