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: ESASsRzk
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CountBean.java "ej>1{3Y:=
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/* V`WfJ>{;Z
* CountData.java cdIy[
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* up2%QbN(
* Created on 2007年1月1日, 下午4:44 @,aL'2G
* !Xj m h$F
* To change this template, choose Tools | Options and locate the template under d=4MqX r
* the Source Creation and Management node. Right-click the template and choose puqH%m+u
* Open. You can then make changes to the template in the Source Editor. 3iEcLhe"4
*/ >PGm} s_
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package com.tot.count; !s)$_tG
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/** FUcs=7c
* H*\ }W
* @author P|(J]/
*/ UU
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public class CountBean { \iE'E
private String countType; gCm?nb)
int countId; %mYIXsuH
/** Creates a new instance of CountData */ 9vj:=,TNu
public CountBean() {} F#<PFT4i
public void setCountType(String countTypes){ sw@2
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this.countType=countTypes; ntkinbbD
} #b" IX`5
public void setCountId(int countIds){ n `Xz<Q!
this.countId=countIds; */+s^{W7
} vaxg^n|v9
public String getCountType(){ %!$-N!e
return countType; \S@A
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} 4*,q1yK
public int getCountId(){ s,29_z7
return countId; &4%J35~
} q7PRJX
} SmLYxH3F
/&|pXBY$;
CountCache.java s+w<!`-
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/* 7cy~qg
* CountCache.java Kk(ucO
* R`?^%1^N
* Created on 2007年1月1日, 下午5:01 s*X\%!l9
* DvKM>P%|
* To change this template, choose Tools | Options and locate the template under C}kJGi
* the Source Creation and Management node. Right-click the template and choose H'`(|$:|
* Open. You can then make changes to the template in the Source Editor. ,Df36-74v5
*/ E9:hK
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package com.tot.count; stG&(M
import java.util.*; &; skB.
/** 3.H-G~
* @~XlI1g$i
* @author yfW^wyDd2o
*/ j)DZmGg&t
public class CountCache { <`*P/V
public static LinkedList list=new LinkedList(); }\{1`$*~
/** Creates a new instance of CountCache */ #dt2'V- ,
public CountCache() {} #G=QL(f>/
public static void add(CountBean cb){ R qz()M
if(cb!=null){ 7tpZE+OX
list.add(cb); mwCnP8:K
} Rx"Qwi, \U
} v`w?QIB]
} @]tGfr;le&
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CountControl.java $I36>
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/* Lx{N%;t*E
* CountThread.java K@~#Gdnl
* hNo>)$v!s
* Created on 2007年1月1日, 下午4:57 IyN9
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* 'uzv\[
* To change this template, choose Tools | Options and locate the template under Kc\'s65.]
* the Source Creation and Management node. Right-click the template and choose o#) !b:/
* Open. You can then make changes to the template in the Source Editor. TkoXzG8yE<
*/ %pkq ?9
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package com.tot.count; 'aP*++^
import tot.db.DBUtils; R<HZC;x
import java.sql.*; 5yiiPK$qr
/** "4hpU]4j
* gA1in
* @author 97wy;'J[u
*/ SvP\JQ<c
public class CountControl{ >m1V9A
private static long lastExecuteTime=0;//上次更新时间 z8 ;#H
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 z\8yB`8b^
/** Creates a new instance of CountThread */ tB=D&L3
public CountControl() {} TK/'=8
public synchronized void executeUpdate(){ .^IhH|U
Connection conn=null; x<\D@X^
PreparedStatement ps=null; &N_c-@2O
try{ WriN]/yD
conn = DBUtils.getConnection(); 3e6Y
conn.setAutoCommit(false); x0h3jw+6
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); rL
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for(int i=0;i<CountCache.list.size();i++){ 9Y%?)t.2
CountBean cb=(CountBean)CountCache.list.getFirst(); LsQ8sFP_"
CountCache.list.removeFirst(); <N=p:e,aN,
ps.setInt(1, cb.getCountId()); H..ZvGu
ps.executeUpdate();⑴ Qb't*2c%
//ps.addBatch();⑵
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} SKpPR;=q|:
//int [] counts = ps.executeBatch();⑶ */^2RZg|W
conn.commit(); zMYd|2bc
}catch(Exception e){ G68Nv:
e.printStackTrace(); ?5v5:U(A
} finally{ RjGB#AK
try{ nlebFDb7
if(ps!=null) { >`<2}Me6
ps.clearParameters(); c\MsVH2|
ps.close(); OW^2S_H5
ps=null; gGX0+L@E
} i`KZ,
}catch(SQLException e){} U\Ar*b) /T
DBUtils.closeConnection(conn); /uE^H%9h
} )Bn>/-
} x:?a;m uf
public long getLast(){ |^PLZ>
return lastExecuteTime; ?S&w0}R
} Xs>s|_T
public void run(){ .K@x4
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long now = System.currentTimeMillis(); ~`\9Q
if ((now - lastExecuteTime) > executeSep) { ^5^}MB%
//System.out.print("lastExecuteTime:"+lastExecuteTime); J,1osG<6x
//System.out.print(" now:"+now+"\n"); `N,Vs n"
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); D=~B7b:
lastExecuteTime=now; -N7xO)
executeUpdate(); WR
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} 0Ox|^V
else{ /iUUM
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 9fuJJ3L[
} [{@zb-h
} e$Bf[F#;-
} Cfr<D3&,]
//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 Xn/ n|[
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类写好了,下面是在JSP中如下调用。 '(*&Ax
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<% Zlk,])9 Q
CountBean cb=new CountBean(); rv}mD
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); MyH[v E^b
CountCache.add(cb); ^`rpf\GX(
out.print(CountCache.list.size()+"<br>"); TX23D)CX
CountControl c=new CountControl(); CZyz;Jtk
c.run(); PUP"ky^q"
out.print(CountCache.list.size()+"<br>"); q]eFd6
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