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: N\*oL*[j
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CountBean.java =KHb0d |.
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/* xg/(
* CountData.java :rU.5(,
* nDdY~f.B
* Created on 2007年1月1日, 下午4:44 %]}JWXof
* jKmjZz8L]%
* To change this template, choose Tools | Options and locate the template under r1< 'l
* the Source Creation and Management node. Right-click the template and choose `{!A1xKZ
* Open. You can then make changes to the template in the Source Editor. 6:G&x<{
*/ UDr1t n
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package com.tot.count; Ob]\t/:%P
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/** 68,j~e3-i
* CWkWW/ZI
* @author <&b,%O
*/ Pg T3E
public class CountBean { "<0 !S~]
private String countType; Y^Buz<OiG
int countId; Bbs1U
/** Creates a new instance of CountData */
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public CountBean() {} $/"Ymm#"\Y
public void setCountType(String countTypes){ #a=]h}&1?
this.countType=countTypes; #6\mTL4vg
} HDKF>S_S
public void setCountId(int countIds){ .t\J@?Z
this.countId=countIds; C&Q[[k"kb
} ~$6` e:n
public String getCountType(){ &6CDIxH{
return countType; esTL3 l{[
} WDghlC6g!l
public int getCountId(){ OE(y$+L3_I
return countId; t`Bk2Cc)+
} ppIXS(
} <fHHrmZ#/.
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CountCache.java DtBvfYO8)>
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/* g0B-<>E
* CountCache.java tb?TPd-OY
* @:w^j0+h
* Created on 2007年1月1日, 下午5:01 -`5]%.E&8
* xT&/xZLT
* To change this template, choose Tools | Options and locate the template under [gUD +
* the Source Creation and Management node. Right-click the template and choose rOLZiE T
* Open. You can then make changes to the template in the Source Editor. vW.f`J,\D'
*/ JG^GEJ
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package com.tot.count; r Yt|[Pk
import java.util.*; $'CS/U`E}
/** }0<2n~3P
* H5d@TB,`
* @author q<.k:v&
*/ b'^<0c
public class CountCache { =W')jKe0
public static LinkedList list=new LinkedList(); ~h<T0Zc
/** Creates a new instance of CountCache */ \'g7oV;>cI
public CountCache() {} 5hEA/G
public static void add(CountBean cb){ m==DBh
if(cb!=null){ 1Bs t|
list.add(cb); z{BgAI,
} *eXs7 "H
} J0bcW25
} <~ay4JY
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CountControl.java ,e 7
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/* w$s6NBF7
* CountThread.java g@O?0,+1
* '_DB0_Dp
* Created on 2007年1月1日, 下午4:57 {7X9P<<L7
* cfBlHeYE
* To change this template, choose Tools | Options and locate the template under qldm"Ul
* the Source Creation and Management node. Right-click the template and choose Q+a&a]*KL^
* Open. You can then make changes to the template in the Source Editor. V`/c#y||
*/ fZap\
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package com.tot.count; ^Q0=Ggh
import tot.db.DBUtils; r;(^]Soz
import java.sql.*; Z
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/** w"kBAi&
* U7zd7O
* @author eGKvzu
*/ | LZ+_
public class CountControl{ dJQwb
private static long lastExecuteTime=0;//上次更新时间 :Eg4^,QX
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 N6\m*j,`
/** Creates a new instance of CountThread */ m(xyEU
public CountControl() {} P"Q6 wdm
public synchronized void executeUpdate(){ w?fq%-6f*
Connection conn=null; H2g#'SK@
PreparedStatement ps=null; ~r})&`5
try{ q2Sc{E>[
conn = DBUtils.getConnection(); M_$;"NS+}
conn.setAutoCommit(false); "_rpErm
}
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); E_D@7a
for(int i=0;i<CountCache.list.size();i++){ iH)vLD
CountBean cb=(CountBean)CountCache.list.getFirst(); _w <6o<@
CountCache.list.removeFirst(); N-<,wUxf
ps.setInt(1, cb.getCountId()); 04X/(74
ps.executeUpdate();⑴ ?$\sMkn
//ps.addBatch();⑵ R6GlQ G
} C?g*c
//int [] counts = ps.executeBatch();⑶ Cw.DLg
conn.commit(); |BbrB[+ v[
}catch(Exception e){ ?ZKIs9E[m
e.printStackTrace(); }&Xf<6
} finally{ /T&+vzCF
try{ FSZ :}Q
if(ps!=null) { L6=5]?B=
ps.clearParameters(); .'1]2/ad
ps.close(); .,p@ee$q
ps=null; RBeQT=B8~
} XPi5E"
}catch(SQLException e){} unN*L
DBUtils.closeConnection(conn); y.Yni*xt/
} )4w3$Q
} `g}en%5b\
public long getLast(){ 8\`otJY
return lastExecuteTime; mL s>RR#b
} b:*(
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public void run(){ j4D`Xq2X
long now = System.currentTimeMillis(); _#E@&z".L
if ((now - lastExecuteTime) > executeSep) { GtqA@&5&
//System.out.print("lastExecuteTime:"+lastExecuteTime); wqQrby<
//System.out.print(" now:"+now+"\n"); #|cr\\2*
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); PtKrks|y
lastExecuteTime=now; /T<,vR
executeUpdate(); N!af1zj
} 7lQ:}&
else{ &K,rNH'R
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 3q (]Dg;v
} .|J-(J<>[.
} IqjH
} B}ASZYpW>
//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 0\Myhh~DLE
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类写好了,下面是在JSP中如下调用。 }z wHUf9q1
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<% dO[pm0
CountBean cb=new CountBean(); JsQmn<Yt
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 'y:+w{I2o
CountCache.add(cb); JiHk`e`
out.print(CountCache.list.size()+"<br>"); bQ_N^[oxQ
CountControl c=new CountControl(); q+Qrc]>-f
c.run(); )@.6u9 \
out.print(CountCache.list.size()+"<br>"); $x1PU67
%>