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: 4&/-xg87(
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CountBean.java VmB/X))
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/* ? I}T[j
* CountData.java z
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* a;Y9wn
* Created on 2007年1月1日, 下午4:44 $*H>n!&
* LHWh-h(s
* To change this template, choose Tools | Options and locate the template under A4?_0:<
* the Source Creation and Management node. Right-click the template and choose -3r&O:
* Open. You can then make changes to the template in the Source Editor. !lF|90=
*/ 6X:-Z3
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package com.tot.count; !m1pL0
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/** )N2yhdcqI
* .n`MPx'
* @author k>Qr14F
*/ pDlh^?cux
public class CountBean { V@K}'f~
private String countType; x9HA^Rj4-
int countId; &w3LMOT
/** Creates a new instance of CountData */ 8X]j;Rb
public CountBean() {} ~4*9w3t
public void setCountType(String countTypes){ q6{ %vd
this.countType=countTypes; )x"Z$ jIs
} H2RNekck
public void setCountId(int countIds){ ,Fg&<Be}Jx
this.countId=countIds; 0r=Lilu{q
} s/Wg^(&M
public String getCountType(){ r/L3j0
return countType; DRVvW6s
} v4|kiy
public int getCountId(){ bah5 f
return countId; Pwz^{*u]
} VPg`vI$(X
} i4!n Oyk
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CountCache.java 'eqvK|Uj:
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/* hv
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* CountCache.java !HDk]
* =fi.*d?$7
* Created on 2007年1月1日, 下午5:01 ^m8\fCA*
* ;wprHXjq
* To change this template, choose Tools | Options and locate the template under fC%;|V'Nd
* the Source Creation and Management node. Right-click the template and choose qBX<{[
* Open. You can then make changes to the template in the Source Editor. >e-XZ2>Sj
*/ L*h X_8J
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package com.tot.count; Yjk A^e
import java.util.*; 60AX2-sdJ,
/** ~rY<y%K
* wQnr*kyza
* @author K{>O.5
*/ &"C1XM
public class CountCache { #8|;Q`Or:
public static LinkedList list=new LinkedList(); %v~j10e
/** Creates a new instance of CountCache */ 7X}_yMxc
public CountCache() {} (DKpJCx
public static void add(CountBean cb){ 0#*\o1r\p
if(cb!=null){ on&N=TN
list.add(cb); 2#W%--
} 7@tr^JykO
} ^#^u90I
} ~P6K)V|@<
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CountControl.java ~?b(2gn
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/* x5`q)!<&
* CountThread.java ]P<&CEk
* /e{Oqhf[n
* Created on 2007年1月1日, 下午4:57 [S</QS!
* <!OP b(g2
* To change this template, choose Tools | Options and locate the template under tg8VFH2q.z
* the Source Creation and Management node. Right-click the template and choose 1NOz $fW
* Open. You can then make changes to the template in the Source Editor. 'OX6eY5
*/ J?%D4AeS]v
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package com.tot.count; bR&hI9`%F
import tot.db.DBUtils; c@nl;u)n
import java.sql.*; X?7$JV-:
/** ^ACp_RM
* 'pm2C6AC
* @author (vj2XiO^+
*/ zLh ~x
public class CountControl{ rX{|]M":T
private static long lastExecuteTime=0;//上次更新时间 =h_4TpDQ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 \v-> '
/** Creates a new instance of CountThread */ zRE7 w:
public CountControl() {} Ha+FH8rZ
public synchronized void executeUpdate(){ D *LZ_
Connection conn=null; E!Fy2h>[Z
PreparedStatement ps=null; 0|^x[dh
try{ <
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conn = DBUtils.getConnection(); 1;:2 =8
conn.setAutoCommit(false); -ZyFUGd%
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ([9h.M6v
for(int i=0;i<CountCache.list.size();i++){ .PAkW2\#
CountBean cb=(CountBean)CountCache.list.getFirst(); uqO51V~
CountCache.list.removeFirst(); J0=`n(48B
ps.setInt(1, cb.getCountId()); HWefuj
ps.executeUpdate();⑴ M $~h(3
//ps.addBatch();⑵ }=GyBnXu
} iPFYG
//int [] counts = ps.executeBatch();⑶ BEI/OGp
conn.commit(); #JLDj(a?
}catch(Exception e){ GO?-z 0V
e.printStackTrace(); ~l}TlRqL
} finally{ ^c(PZ,/#JB
try{ G0(c@FBK
if(ps!=null) { E$ngmm[
ps.clearParameters(); g3Xz-
ps.close(); <hK$Cf_
ps=null; ~hxB Pn."
} q]r!5&Z