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: )x?F1/
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CountBean.java NVJvCs)3f
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/* H)t8d_^|j
* CountData.java #H M0s~^w&
* p.8G]pS
* Created on 2007年1月1日, 下午4:44 *Fp )/Ih
* /!jn$4fd:
* To change this template, choose Tools | Options and locate the template under yd`.Rb&V
* the Source Creation and Management node. Right-click the template and choose 7&|fD{:4U
* Open. You can then make changes to the template in the Source Editor. dwB-WF%k
*/ 6i{W=$RQ
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package com.tot.count; Q9FY.KUM
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/** B5J=q("P
* A%%WPBk{O
* @author &ATjDbW*(
*/ y;sr# -L
public class CountBean { }3M\&}=8
private String countType; 3 T&m
int countId; 1w1(FpQO.
/** Creates a new instance of CountData */ gd/W8*NFR
public CountBean() {} j.AAY?L
public void setCountType(String countTypes){
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this.countType=countTypes; >E[cl\5$E
} Q4_j`q
public void setCountId(int countIds){ bWjW_$8
this.countId=countIds; Tx],-
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} fu\M2"e
public String getCountType(){ #}e)*(
return countType; Gi ZyC
} gQ,PG
public int getCountId(){ WAkKbqJV
return countId; LGRX@nF#
} FW=oP>f]w
} :);GeZ
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CountCache.java Ko2{[%
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/* g^4'42UX
* CountCache.java U1J?o#(
* 3 LoB-4u?
* Created on 2007年1月1日, 下午5:01 ^MQ7*g6o
* &kYg
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* To change this template, choose Tools | Options and locate the template under <E!M<!h
* the Source Creation and Management node. Right-click the template and choose I:bi8D6
* Open. You can then make changes to the template in the Source Editor.
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*/ fZT=q^26
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package com.tot.count; iS=}| 8"
import java.util.*; D]Bvjh
/** /nGsl<
* ZU7,=B=
* @author "P"~/<:)
*/ |4ONGU*`E
public class CountCache { DY0G;L3
public static LinkedList list=new LinkedList(); ()=
/** Creates a new instance of CountCache */ |*i0h`a
public CountCache() {} $iupzVrro
public static void add(CountBean cb){ k0!b@
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if(cb!=null){ a
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list.add(cb); !imm17XQ\
} .E"hsGH9h
} d7N}-nsB
} /\_0daUx
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CountControl.java ~X*)gS-=
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/* =|
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* CountThread.java '
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* -*M/,O
* Created on 2007年1月1日, 下午4:57 Qt+ K,LY
* Gt2NUGU
* To change this template, choose Tools | Options and locate the template under XjuAVNY
* the Source Creation and Management node. Right-click the template and choose /RIvUC1
* Open. You can then make changes to the template in the Source Editor. <A; R%\V
*/ )apqL{u:=
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package com.tot.count; 4
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import tot.db.DBUtils; 7D@O:yO
import java.sql.*; %J5zfNe)&
/** N~=p+Ow[H
* 2$V]XSe
* @author T&H[JQ/h
*/ w[S2
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public class CountControl{ LBh|4S$K
private static long lastExecuteTime=0;//上次更新时间 "t$c'`
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 k1e0kxn
/** Creates a new instance of CountThread */ &^=6W3RD
public CountControl() {} 8J-$+ ;
public synchronized void executeUpdate(){ 56Z 1jN^U
Connection conn=null; 5(W`{{AW
PreparedStatement ps=null; V^Z"FwWk
try{ J!b
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conn = DBUtils.getConnection(); _WO*N9Iz
conn.setAutoCommit(false); 2R66 WKQ
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); kTZ`RW&0
for(int i=0;i<CountCache.list.size();i++){ D[yOFJ~p)
CountBean cb=(CountBean)CountCache.list.getFirst(); klmRU@D
CountCache.list.removeFirst(); e <2?O
ps.setInt(1, cb.getCountId()); ZCsL%(
ps.executeUpdate();⑴ r%\(5H f
//ps.addBatch();⑵ 7D PKKvQ
} Y3KKskhLx
//int [] counts = ps.executeBatch();⑶ f_2tMiy5
conn.commit(); sOQF_X(.x
}catch(Exception e){ s
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e.printStackTrace(); \X1?,gV_
} finally{ <Yif-9
try{ o?%1^6&HE
if(ps!=null) { !A!}j.s
ps.clearParameters(); <mN.6@*{
ps.close(); +0)s{?
ps=null; /qM:;:N%j
} AWsy9
}catch(SQLException e){} ,kS3Ioj
DBUtils.closeConnection(conn); *-0tj~)>
} 6vy(@z
} 6%?bl{pNn
public long getLast(){ r$7fw}'I
return lastExecuteTime; iG*@(
} BSU%.tmI
public void run(){ |-t>_+. J'
long now = System.currentTimeMillis(); UolsF-U}'
if ((now - lastExecuteTime) > executeSep) { a
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//System.out.print("lastExecuteTime:"+lastExecuteTime); %N``EnF2
//System.out.print(" now:"+now+"\n"); `P/7Mf
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 36MqEUjyB
lastExecuteTime=now; ^U1@
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executeUpdate(); !Q(x A,p
} -CePtq`
else{ 7tbM~+<0
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); KA^r,Iw
} Ed6k7
} pgNyLgN
} .%Pt[VQ
//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 i
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类写好了,下面是在JSP中如下调用。 ).IB{+
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<% qRk<1.
CountBean cb=new CountBean(); YS$42J_T
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 2GRL`.1
CountCache.add(cb); Ky:y1\K1^K
out.print(CountCache.list.size()+"<br>"); ,e]|[,r#5
CountControl c=new CountControl(); J9buf}C[
c.run(); Eu;f~ V
out.print(CountCache.list.size()+"<br>"); }\
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%>