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: vIvIfE
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CountBean.java *hrvYil2b
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/* C^){.UGmJ
* CountData.java /}$+uBgJm
* hb-%_c"kq
* Created on 2007年1月1日, 下午4:44 TzZq(?V
* b$7 +;I;
* To change this template, choose Tools | Options and locate the template under IgzQr >
* the Source Creation and Management node. Right-click the template and choose 3R/bz0 V>
* Open. You can then make changes to the template in the Source Editor. 'R)Tn!6
*/ KoRV%@I
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package com.tot.count; 0_/[k*Re
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/** 2!\DPX
* JC"z&ka
* @author eE Kf|I
*/ K:M8h{Ua
public class CountBean { =D(j)<9$A
private String countType; m~|40)
int countId; "4Nt\WQ
/** Creates a new instance of CountData */ +_!QSU,@
public CountBean() {} ~Ei<Z`3}7"
public void setCountType(String countTypes){ h;Kx!5)y
this.countType=countTypes; TpaInXR
} RCrCs
public void setCountId(int countIds){ ;a/E42eN;
this.countId=countIds; !Cs_F&l"j
} #4:?gfIj
public String getCountType(){ o-\[,}T)M
return countType; `^vE9nW7
} sKWfXCd
public int getCountId(){ z}<^jgJ
return countId; _`V'r#Qn
} VTM/hJmwJ
} wzA$'+Mb
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CountCache.java }bDm@NU
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/* 1 zZlC#V
* CountCache.java ]5O~+Nf
* =]t|];c%
* Created on 2007年1月1日, 下午5:01 GyIV
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* Xvv6~
* To change this template, choose Tools | Options and locate the template under 7$b1<.WX
* the Source Creation and Management node. Right-click the template and choose H\
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* Open. You can then make changes to the template in the Source Editor. 6863xOv{T
*/ 1oS/`)
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package com.tot.count; M}a6Vu9
import java.util.*; 3]>| i
/** 0sqFF[i
* >z03{=sAN
* @author ]]mJ']l
*/ sK{e*[I>W
public class CountCache { 9x8fhAy}4
public static LinkedList list=new LinkedList(); Q8NX)R
/** Creates a new instance of CountCache */ b
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public CountCache() {} 0[`^\Mv4y
public static void add(CountBean cb){ Y73C5.dNcE
if(cb!=null){ :h$$J
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list.add(cb); 0f/<7R
} |>Vb9:q9Po
} ok[i<zl;'
} 97]E1j]
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CountControl.java "g|#B4'e
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/* i. "v4D
* CountThread.java 8y L Y
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* Created on 2007年1月1日, 下午4:57 UZMd~|
* uT{q9=w
* To change this template, choose Tools | Options and locate the template under P?\6@_ Z
* the Source Creation and Management node. Right-click the template and choose @- xjfC\d
* Open. You can then make changes to the template in the Source Editor. ]'}L 1r
*/ G2D$aSh
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package com.tot.count; x4 yR8n(
import tot.db.DBUtils; pb}*\/s
import java.sql.*; $X6h|?3U,
/**
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* >j/w@Fj
* @author f?Lw)hMrA
*/ KHme&yMq
public class CountControl{ ]`K2N
private static long lastExecuteTime=0;//上次更新时间 vgPCQO([
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 sT)CxOV
/** Creates a new instance of CountThread */ m@c)Xci
public CountControl() {} 3$ pX
public synchronized void executeUpdate(){ NOva'qk
Connection conn=null; j_AACq
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PreparedStatement ps=null; UVP vOtZj
try{ UfGkTwoo=
conn = DBUtils.getConnection(); 29KiuP
conn.setAutoCommit(false); wj,=$RX
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); +whDU2 "
for(int i=0;i<CountCache.list.size();i++){ q1,~
CountBean cb=(CountBean)CountCache.list.getFirst(); py4 h(04u
CountCache.list.removeFirst(); Xhm
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ps.setInt(1, cb.getCountId()); KPF1cJ2N
ps.executeUpdate();⑴ SU0
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//ps.addBatch();⑵ xpt:BBo
} Sc0w.5m6
//int [] counts = ps.executeBatch();⑶ (HVGlw'`
conn.commit(); X8|,
}catch(Exception e){ .]^?<bG
e.printStackTrace(); ueudRb
} finally{ G[=c
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try{ pP_LR
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if(ps!=null) { O-^Ma-}
ps.clearParameters(); t_^4`dW`
ps.close(); #e"[^_C@!
ps=null; mt
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} @]j1:PN-
}catch(SQLException e){} A"]YM'.
DBUtils.closeConnection(conn); f#;> g
} iTwm3V
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} ;pAK_>
public long getLast(){ GOPfXtkC
return lastExecuteTime; ;p//QJB9
} _)8s'MjA:&
public void run(){ jp,4h4C^)
long now = System.currentTimeMillis(); K0~rN.C!0
if ((now - lastExecuteTime) > executeSep) { ?4 ,T}@P
//System.out.print("lastExecuteTime:"+lastExecuteTime); 1?}T=)3+$
//System.out.print(" now:"+now+"\n"); A^g(k5M*
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); dN q$}
lastExecuteTime=now; h{Y",7]!
executeUpdate();
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} LV Ge]lD
else{ Xvu(vA
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); vP&(-a
} !0+JbZ<%r|
} 1M 6D3d_
} a(nlTMfu
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 dd;~K&_Q/i
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类写好了,下面是在JSP中如下调用。 )7F/O3Tq
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<% 4s-!7
CountBean cb=new CountBean(); th_oJcS
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); sC'`~}C
CountCache.add(cb); G{}VPcrbC
out.print(CountCache.list.size()+"<br>"); @JMiO^
CountControl c=new CountControl(); C+$#y2"z#n
c.run(); $4LzcwG
out.print(CountCache.list.size()+"<br>"); M3\AY30L
%>