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: 1btQ[a6j
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CountBean.java |`9POl=
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/* U/E M(y
* CountData.java S?nXpYr
* uzL)qH$b
* Created on 2007年1月1日, 下午4:44 #_{3W-35*
* HK>!%t0S
* To change this template, choose Tools | Options and locate the template under w">XI)*z
* the Source Creation and Management node. Right-click the template and choose <5MnF
* Open. You can then make changes to the template in the Source Editor. +)Tt\Q%7
*/ Hep]jxp+
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package com.tot.count; [E_6n$w
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/** NKd!i09`
* djV^A
* @author O<l_2?S1
*/ $trvNbco
public class CountBean { ]ERPWW;^
private String countType; Ia:n<sZU
int countId; $x]'6
/** Creates a new instance of CountData */ >=c<6#:s<9
public CountBean() {} g7@G&Ro9J\
public void setCountType(String countTypes){ Cul^b_UmP#
this.countType=countTypes; ZLe@O~f;%
} hdtb.u~
public void setCountId(int countIds){ n=
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this.countId=countIds; xuQ$67F`;z
} A7DEAT))4L
public String getCountType(){ u|ia
return countType; xlF$PpRNM
} t_c;4iE
public int getCountId(){ Qjh5m5e
return countId; Da5Zz(
} ]+Yd#<j(u
} A-r-^S0\
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CountCache.java UOH2I+@V
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/* V*SKWP
* CountCache.java +=hiLfnE
* M >Yx_)<U
* Created on 2007年1月1日, 下午5:01 4AB7 uw
* )~;= 0O |X
* To change this template, choose Tools | Options and locate the template under Ua]shSjyI
* the Source Creation and Management node. Right-click the template and choose =@;uDu:Q
* Open. You can then make changes to the template in the Source Editor. ]N}80*Rl
*/ g@hg u
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package com.tot.count; !vHUe*1a{
import java.util.*; Q+gd|^Vc9
/** fdGls`H
* ]N!382
* @author *@|d7aiO
*/ IQxY]0\uf6
public class CountCache { %M^X>S\%
public static LinkedList list=new LinkedList(); {tMpI\>S
/** Creates a new instance of CountCache */ w+gA3Dg
public CountCache() {} Y s[J xP
public static void add(CountBean cb){ 74ma
if(cb!=null){ ae( o:G
list.add(cb); H2`aw3
} xM}lX(V!w
} vs;T}'O
} |H 0+.f;
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CountControl.java i6M_Gk}
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/* msOk~ZPE6\
* CountThread.java cx M=#Go
* dQLR%i#P8
* Created on 2007年1月1日, 下午4:57 XzGPBi
* 2V7x
* To change this template, choose Tools | Options and locate the template under `=^;q6f
* the Source Creation and Management node. Right-click the template and choose 8?!=/Sc
* Open. You can then make changes to the template in the Source Editor. oUXu;@l
*/ IT]D;
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package com.tot.count; p6u"$)wt
import tot.db.DBUtils; Tq[=&J
import java.sql.*; 8xzEbRNJ)
/** SbU=Lkx#
* YpMQY-n
* @author &NiDv
*/ Dz;^'
public class CountControl{ K*jV=lG
private static long lastExecuteTime=0;//上次更新时间 7sZVN
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 F`g oYwA%
/** Creates a new instance of CountThread */ ,\zp&P"p
public CountControl() {} +"rZ< i
public synchronized void executeUpdate(){ LM}0QL
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Connection conn=null;
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PreparedStatement ps=null; eU?SLIof[{
try{ H~JPsS;
conn = DBUtils.getConnection(); .q#2 op
conn.setAutoCommit(false); hGyi@0
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); k ]C+/
for(int i=0;i<CountCache.list.size();i++){ V}(snG,
CountBean cb=(CountBean)CountCache.list.getFirst(); pH5"g"e1
CountCache.list.removeFirst(); vk:@rOpl
ps.setInt(1, cb.getCountId()); rCqcl
ps.executeUpdate();⑴ M0g!"0?
//ps.addBatch();⑵ ~E&drl\
} /Hb'3,jN
//int [] counts = ps.executeBatch();⑶ ZOvMA]Rf
conn.commit(); FM:ax{
}catch(Exception e){ ^;4nHH7z-,
e.printStackTrace(); Ex^|[iV
} finally{ 6U)Lhf\'o
try{ "MZj}}l
if(ps!=null) { ;Q>(%"z};
ps.clearParameters(); .n1]Yk;,1
ps.close(); !~PLW] Z4
ps=null; 1^rODfY 0
} 6O2 r5F$T
}catch(SQLException e){} BtDi$d%'
DBUtils.closeConnection(conn); sr,8zKM)
} `P}T{!P+6
} l1On .s
public long getLast(){ h3Kv0^{
return lastExecuteTime; ] >-#T
} %tiFx:F+
public void run(){ HI6;=~[
long now = System.currentTimeMillis(); Q|Uq.UjY
if ((now - lastExecuteTime) > executeSep) { Q| >
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//System.out.print("lastExecuteTime:"+lastExecuteTime); Wo=Q7~
//System.out.print(" now:"+now+"\n"); Rr+Y::E
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); KY$6=/?U_
lastExecuteTime=now; ~_=ohb{
executeUpdate(); `~Nd4EA)2
} =;Gy"F1 dp
else{ "pTyQT9P
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); "Wd?U[[
} C'3/B)u}l
} tAH,3Sz( /
}
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//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 NFTEp0eP
:9!?${4R
类写好了,下面是在JSP中如下调用。 ]p>6r*/nw
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<% R4=n">>Q
CountBean cb=new CountBean(); i_T8Bfd:
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); "2:]9j
CountCache.add(cb); VKRj
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out.print(CountCache.list.size()+"<br>"); kK+<n8R2
CountControl c=new CountControl(); /]4[b!OTJ
c.run(); aW$(lf2;
out.print(CountCache.list.size()+"<br>"); /pzEL
%>