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: 82bOiN15
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CountBean.java IT~pp_6g
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/* 8aSH0dX
* CountData.java T)QT_ST.9
* EhBYmc"&
* Created on 2007年1月1日, 下午4:44 ;.g <u
* p*^[
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* To change this template, choose Tools | Options and locate the template under F;&a=R!.
* the Source Creation and Management node. Right-click the template and choose `vijd(a?v
* Open. You can then make changes to the template in the Source Editor. ~Uet)y<
*/ oy)'wb~
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package com.tot.count; ZTwCFn
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/** Q41eYzAi
* Nhm)bdv]
* @author &74*CO9B9
*/ qU) pBA
public class CountBean { Q]u*Oels
private String countType; i1kTP9
int countId; 0R0j7\{
/** Creates a new instance of CountData */ XZk?aik}`
public CountBean() {} jPjFp35;zb
public void setCountType(String countTypes){ I>jDM
this.countType=countTypes; ?\l@k(w4[x
} ]5=C3Y
public void setCountId(int countIds){ #el i_Cxe
this.countId=countIds; ?z2k74&M^
} Rf~? u)h1
public String getCountType(){ G2{.Ew
return countType; X~Yj#@
} pxs#OP
public int getCountId(){ >,v,4,c
return countId; #<\A[Po
} dt efDsK
} > $#v\8
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CountCache.java S1R:/9
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/* y^SDt3Am
* CountCache.java V+M=@Pvp9
* o y'GAc/
* Created on 2007年1月1日, 下午5:01 U6pG
* X8Xw'
* To change this template, choose Tools | Options and locate the template under ;3D[[*n9
* the Source Creation and Management node. Right-click the template and choose -]?F
* Open. You can then make changes to the template in the Source Editor. Ba9le|c5
*/ Y;L,}/[
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package com.tot.count; BpGK`0H
import java.util.*; \*C}[D
/** ]y3'6!
* {M5[gr%
* @author >4zH\T!
*/ E_aDkNT
public class CountCache { vPV=K+1
public static LinkedList list=new LinkedList(); `;@#yyj:_
/** Creates a new instance of CountCache */ :d7tzYT ^
public CountCache() {} "Zh6j)[o
public static void add(CountBean cb){ ~[por
if(cb!=null){ !1:364
list.add(cb); K'`N(WiL
} ~t $zypw
} .[Z<r>
} 4mG?$kCN
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CountControl.java Uv(THxVh
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/* %D(%
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* CountThread.java LV:`siK
* xJvM
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* Created on 2007年1月1日, 下午4:57 QT5,_+ho
* v$O%U[e<
* To change this template, choose Tools | Options and locate the template under 0<{+M` G/
* the Source Creation and Management node. Right-click the template and choose ]yxRaW9f
* Open. You can then make changes to the template in the Source Editor. Zz\e:/
*/ fR=B/`
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package com.tot.count; ]"3(UKx
import tot.db.DBUtils; *E Z'S+wR
import java.sql.*; PF,|Wzx
/** Y6|8;2E
* ]#C;)Vy
* @author Vp;^_,
*/ xp395ub6
public class CountControl{ -`mHb
private static long lastExecuteTime=0;//上次更新时间 SWX;sM
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 9`/\|t|V
/** Creates a new instance of CountThread */ (W7cQ>
public CountControl() {} A.!V*1h{
public synchronized void executeUpdate(){ L{hP&8$k
Connection conn=null; K%) K$/A
PreparedStatement ps=null; m)A~1+M$)L
try{ "Q:m0P
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conn = DBUtils.getConnection(); lbw*T
conn.setAutoCommit(false); `YDe<@6'
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); *Ge2P3
for(int i=0;i<CountCache.list.size();i++){ D(MolsKc?
CountBean cb=(CountBean)CountCache.list.getFirst(); [jD.l;jF
CountCache.list.removeFirst(); pZu2[
ps.setInt(1, cb.getCountId()); A~CQ@
ps.executeUpdate();⑴ /
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//ps.addBatch();⑵ !H`! KBW
} L6^Qn%:OTd
//int [] counts = ps.executeBatch();⑶ N5ityJIgQ
conn.commit(); [dje!5Dc(
}catch(Exception e){ 0L
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e.printStackTrace(); H!y%Fa Ti
} finally{ zCdQI
try{ DK/xHIv8-
if(ps!=null) { \X5>HPB
ps.clearParameters(); 7b,5*]oZ
ps.close(); ;:nO5VFOg
ps=null; t7rz]EN
} }c>[m,lz
}catch(SQLException e){} $Ik\^:-
DBUtils.closeConnection(conn); N7=L^]
} By| y:
} {2`:7U~|
public long getLast(){ @$R[Js%MuO
return lastExecuteTime; -saisH6
} #>m#i1Nu
public void run(){ -5Qsc/s&
long now = System.currentTimeMillis(); (UDR=7w)
if ((now - lastExecuteTime) > executeSep) { mK3U*)A
//System.out.print("lastExecuteTime:"+lastExecuteTime); *(PQaXx4
//System.out.print(" now:"+now+"\n"); S!0ocS!t
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); {wWh;
lastExecuteTime=now; H7 acT
executeUpdate(); T{1Z(M+
} i"}%ib*X
else{ %KxL{HY
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); D2$"!7O1H
} sK~d{)+T
} &J~vXk:
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} 4}:a"1P"
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 t_@xzt10y
_ri1RK,
类写好了,下面是在JSP中如下调用。 1LTl=tS#
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<% J1I"H<}-6
CountBean cb=new CountBean(); 8iTX}$t\{
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); d($f8{~W
CountCache.add(cb); ;<Dou7=
out.print(CountCache.list.size()+"<br>"); Ol4)*/oZ
CountControl c=new CountControl(); >;S/$
c.run(); =W1`FbR
out.print(CountCache.list.size()+"<br>"); 3lc'(ts%
%>