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: =o(5_S.u;
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CountBean.java t|\%VC
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/* dL 1tl
* CountData.java 4[r0G+
* uBKgcpvTs
* Created on 2007年1月1日, 下午4:44 ~H_/zK6e
* nNV'O(x}
* To change this template, choose Tools | Options and locate the template under dq6m>;`
* the Source Creation and Management node. Right-click the template and choose _/$Bpr{R
* Open. You can then make changes to the template in the Source Editor. }eU*(
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*/ %lhEM}Sm
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package com.tot.count; %@aSe2B
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/** A RuA<vQ
* r'r%w#=`t
* @author jXx<`I+]
*/ Yui3+}Ms
public class CountBean { F#Ryu~,"
private String countType; 3{64 @s
int countId; #4%]o%.
/** Creates a new instance of CountData */ O,
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public CountBean() {} K(rWNO
public void setCountType(String countTypes){ _ QI\
this.countType=countTypes; z+wA
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} Tbih+#?
public void setCountId(int countIds){ ]=I@1B;_m
this.countId=countIds; (O?.)jEW(.
} sN*N&XG
public String getCountType(){ T^t#
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return countType; O2E/jj
} m+R[#GE8#
public int getCountId(){ 3?9IJ5p
return countId; YeL#jtC
} "@@u3`#
} &< `N T D
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CountCache.java QB uMJm
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/* wLH>:yKUU
* CountCache.java bKY7/w<dP
* gIa+5\qYY
* Created on 2007年1月1日, 下午5:01 )3}9K
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* =E4LRKn
* To change this template, choose Tools | Options and locate the template under 9'giU r
* the Source Creation and Management node. Right-click the template and choose mt{nm[D!Xp
* Open. You can then make changes to the template in the Source Editor. y/cvQY0pU
*/ VcO0sa f`
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package com.tot.count; Tod&&T'UW
import java.util.*; 4N_R:B-Vu
/** O!#g<`r{K
* +H-6e P
* @author 9G#n 0&wRJ
*/ DDP/DD;n}r
public class CountCache { xd?f2=dd~h
public static LinkedList list=new LinkedList(); W)2p@j59A
/** Creates a new instance of CountCache */ b9J_1Gl]
public CountCache() {} R6Km\N
public static void add(CountBean cb){ Vpz\.]
if(cb!=null){ Oi'5ytsES
list.add(cb); 8,4"uuI
} ^R7lom.
}
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} v5#jZ$<F
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CountControl.java H9`)BbR
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/* {0wIR_dGX
* CountThread.java 2\MT;;ZTZ
* qFCOUl
* Created on 2007年1月1日, 下午4:57 | `2RShu
* Q:G4Z9Kt
* To change this template, choose Tools | Options and locate the template under +US!YU
* the Source Creation and Management node. Right-click the template and choose x_N'TjS^{
* Open. You can then make changes to the template in the Source Editor. i(%W_d!
*/ d9fC<Tp
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package com.tot.count; \O3m9,a
import tot.db.DBUtils; ; ; OAQ`
import java.sql.*; eCU:Q
/** "Y
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* .PIL
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* @author BDW^7[n
*/ o4F2%0gJ
public class CountControl{ s^G.]%iU
private static long lastExecuteTime=0;//上次更新时间 3=P]x;[ba
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 6
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/** Creates a new instance of CountThread */ NqazpB*
public CountControl() {} w7.V6S$Ga
public synchronized void executeUpdate(){ +K:Dx!9
Connection conn=null; Ha0M)0Anv
PreparedStatement ps=null; 9iIhte.
try{ 8yR.uMI$/
conn = DBUtils.getConnection(); }I+E\<
conn.setAutoCommit(false); Xv5wJlc!d
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); sk<3`x+
for(int i=0;i<CountCache.list.size();i++){ 0y'H~(
CountBean cb=(CountBean)CountCache.list.getFirst(); .nf#c.DI
CountCache.list.removeFirst(); J9--tJ?[>o
ps.setInt(1, cb.getCountId()); In"ZIKaC
ps.executeUpdate();⑴ 2+N]PW\V
//ps.addBatch();⑵ ky,(xT4
} WtsFz*`)y
//int [] counts = ps.executeBatch();⑶ r4b 6 c
conn.commit(); 7?!d^$B
}catch(Exception e){ ed{ -/l~j
e.printStackTrace(); z [}v{
} finally{ .]Y$o^mf
try{ bivuqKA
if(ps!=null) { 4<w.8rR:A
ps.clearParameters(); JQ_sUYh~3
ps.close(); +;(c:@>@,
ps=null; twHVv
} )5Q~I,dP
}catch(SQLException e){} YlJ@XpKM
DBUtils.closeConnection(conn); lV3x *4O=
} <y('hI'
} Wq D4YGN
public long getLast(){ 2G& a{
return lastExecuteTime; 9rA0lqr]5
} "+R+6<