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: YWU@e[
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CountBean.java KKpM=MZ
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/* .4]XR/I$
* CountData.java |6^a[x3/U
* ~AD>@;8fG
* Created on 2007年1月1日, 下午4:44 @(L}:]{@
* f\5w@nX
* To change this template, choose Tools | Options and locate the template under g5U,
* the Source Creation and Management node. Right-click the template and choose XOX$uLm
* Open. You can then make changes to the template in the Source Editor. `XF[A8@h
*/ (}wPu&Is,C
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package com.tot.count; e!0xh
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/** QeF:s|[
* p p0356
* @author mNC?kp
*/ 1q;R+65
public class CountBean { rXmrT%7k
private String countType; X"3p/!W.4
int countId; <mP_K^9c
/** Creates a new instance of CountData */ q5Zu'-Cx@
public CountBean() {} ,Gy,bcv{
public void setCountType(String countTypes){ !.%*Tp#k#
this.countType=countTypes; *CGHp8
} (]sm9PO
public void setCountId(int countIds){ c1kV}-v
this.countId=countIds; t ^>07#z
} ]u<U[l-w
public String getCountType(){ o[wiQ9Tl
return countType; xN$V(ZX4
} c\[&IlM
public int getCountId(){ N6kMl
return countId; 8~qpOQX^V
} KUPQ6v }
} "1""1";
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CountCache.java iuqJPW^}
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/* m; =S]3P*
* CountCache.java !M }-N
* #2\M(5d
* Created on 2007年1月1日, 下午5:01 Te!eM{_$T
* \3(s&K\Y6\
* To change this template, choose Tools | Options and locate the template under qDg`4yX.}
* the Source Creation and Management node. Right-click the template and choose o ;9H~E
* Open. You can then make changes to the template in the Source Editor. k^JgCC+
*/ Gn6\n'r0
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package com.tot.count; s,C>l_4-
import java.util.*; [$$R>ELYQ
/** b+RU <qR
* U4a8z<l$
* @author L#D)[v"
*/ =.J>'9 Q
public class CountCache { "AqLR
public static LinkedList list=new LinkedList(); `{yD\qDyX
/** Creates a new instance of CountCache */ = ?/6hB=7<
public CountCache() {} .2P3 !KCL
public static void add(CountBean cb){ 7"eIZ
if(cb!=null){ kVeY} 8
list.add(cb); %;_EWs/z8
} oQVm)Bn'R
} oN83`Z
} Ir` l*:j$
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CountControl.java hYFi"ck
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/* .GYdC'
* CountThread.java <vs*aFq
* S"+#=C
* Created on 2007年1月1日, 下午4:57 =%}(Dvjv
* N>s3tGh
* To change this template, choose Tools | Options and locate the template under \(?d2$0m
* the Source Creation and Management node. Right-click the template and choose \ z*<^ONq
* Open. You can then make changes to the template in the Source Editor. 0jXDjk5'<
*/ qbD_
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package com.tot.count; u3 +]3!BQ
import tot.db.DBUtils; ok-q9dM
import java.sql.*; J| 46i
/** 2c,w
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* lS2`#l >
* @author `LwZ(M-hI
*/ e'v_eD T^
public class CountControl{ ev7A;;
private static long lastExecuteTime=0;//上次更新时间 I#F,
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 2*-qEUl1
/** Creates a new instance of CountThread */ tOj5b7'ui
public CountControl() {} t1#f*G5
public synchronized void executeUpdate(){ o9{1_7K
Connection conn=null; ]G!
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PreparedStatement ps=null; bL:+(/:
try{ je:J`4k$
conn = DBUtils.getConnection();
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conn.setAutoCommit(false); Y}\3PaUa
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); A,#z_2~
for(int i=0;i<CountCache.list.size();i++){ 5 "x1Pln
CountBean cb=(CountBean)CountCache.list.getFirst(); lP(<4mdP
CountCache.list.removeFirst(); /PBK:B
ps.setInt(1, cb.getCountId()); ^sJp!hi4=)
ps.executeUpdate();⑴ NUi&x