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: `fVzY"Qv k
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CountBean.java 5VfpeA`
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/* q zo)\,
* CountData.java `<Hc,D; p
* #SD2b,f
* Created on 2007年1月1日, 下午4:44 HDu|KW$o1
* )coA30YR
* To change this template, choose Tools | Options and locate the template under Th~pju
* the Source Creation and Management node. Right-click the template and choose (ueH@A"9;
* Open. You can then make changes to the template in the Source Editor. }JT&lyO< b
*/ pBQ[lPCY/
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package com.tot.count; _F8-4
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/** ~n/:a
* K:pG<oV|}
* @author 1'B=JyR~K
*/ :n
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public class CountBean { SBw'z(U
private String countType; _,- \;
int countId; [~Z#yEiW^
/** Creates a new instance of CountData */ _tO2PIL@Z
public CountBean() {} r&L1jT.
public void setCountType(String countTypes){ Vr&v:8:wb
this.countType=countTypes; pcm1IwR`
} tfe'].uT
public void setCountId(int countIds){ Z@Qf0
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this.countId=countIds; 2"Y=*s
} 1fF\k#BE-%
public String getCountType(){ #`"B
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return countType; !A_KCM:Ym
} `]Vn[^?D
public int getCountId(){ Uf$IH!5;Z
return countId; ?/p."N:]H
} a1weTn*
} RZj06|r8
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CountCache.java _)#~D*3
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/* \l 3M\$oS>
* CountCache.java w Kz*)C
* $5>x)jr:w+
* Created on 2007年1月1日, 下午5:01 ,z0E2
* +6Vu]96=KC
* To change this template, choose Tools | Options and locate the template under F0Z cV>j}
* the Source Creation and Management node. Right-click the template and choose mOYXd,xd
* Open. You can then make changes to the template in the Source Editor. 9x9E+DG#(
*/ +Pn`AV1
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package com.tot.count; jg3['hTJT
import java.util.*; a\I`:RO=<Z
/** y"nCT3
* Mz6|#P}.s
* @author Z?w=-
*/ UX'tdB
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public class CountCache { @gJPMgF$F
public static LinkedList list=new LinkedList(); Szlww
/** Creates a new instance of CountCache */ _LZ 442
public CountCache() {} Lismo#
public static void add(CountBean cb){ sM%.=~AN
if(cb!=null){ j !`2Z@
list.add(cb); zU};|Zw
} V0:db
} VU|Cct&)
} I~c}&'V
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CountControl.java G@S'_
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/* ve=
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* CountThread.java g|4v>5Y
* Al]z=
* Created on 2007年1月1日, 下午4:57 k:zGv
* +;;pM[U
* To change this template, choose Tools | Options and locate the template under m^,3jssdA
* the Source Creation and Management node. Right-click the template and choose HM\gOz
* Open. You can then make changes to the template in the Source Editor. %w6lNl
*/ e9?y0vT//
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package com.tot.count; 9'JkLgz;d+
import tot.db.DBUtils; o/\z4Ri)$
import java.sql.*; h$fC/Juit
/** |n&EbOmgf
* ^kj%Ekt7
* @author 6~q"#94
*/ H\e<fi%Q
public class CountControl{ QgX[?2
private static long lastExecuteTime=0;//上次更新时间 N&lKo}hk
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 \[x4
/** Creates a new instance of CountThread */ 9L9mi<,
public CountControl() {} <i1P ~
public synchronized void executeUpdate(){ q0
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Connection conn=null; [x|{VJ(h
PreparedStatement ps=null; S8Yh>j8-
try{ r.zJ/Tk
conn = DBUtils.getConnection(); %|3UWN
conn.setAutoCommit(false); T?FR@.
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); =").W \,
for(int i=0;i<CountCache.list.size();i++){ eM`"$xc
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CountBean cb=(CountBean)CountCache.list.getFirst(); aA.TlG@zP
CountCache.list.removeFirst(); y<5xlN(+v
ps.setInt(1, cb.getCountId()); uM~j
ps.executeUpdate();⑴ .](s\6'
//ps.addBatch();⑵ D$c4's`5
} S-+^L|
//int [] counts = ps.executeBatch();⑶ meV
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conn.commit(); _26F[R1><~
}catch(Exception e){ ktKT=(F&
e.printStackTrace(); hC= ="4 -
} finally{ x;R9Gc[5
try{ <$
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if(ps!=null) { Z?-l-sK
ps.clearParameters(); T/C1x9=?
ps.close(); 1e^-_Bo6'o
ps=null; V|fs"HY
} [HENk34
}catch(SQLException e){} uJ$!lyJ6L
DBUtils.closeConnection(conn); !xK`:[B
} )Hy|K1
} pc%_:>
public long getLast(){ 1{V* (=Tp
return lastExecuteTime; xTL"%'|
} SLc'1{
public void run(){ 07+Qai-]
long now = System.currentTimeMillis(); <kmn3w,vi
if ((now - lastExecuteTime) > executeSep) { w~g)Dz2G
//System.out.print("lastExecuteTime:"+lastExecuteTime); Wz7jB6AWA
//System.out.print(" now:"+now+"\n"); R#Bdfmldq
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ;=6~,k)
lastExecuteTime=now; 3J}bI{3
executeUpdate(); w#,C{6
} <&rvv4*H
else{ YvK8;<k@-?
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ?79ABm
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} Tce2]"^;
} `D%bZ%25c
} lU.@! rGbw
//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 6^.<