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: }.j09[<
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CountBean.java Fl'+ C
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/* f*}H4H E O
* CountData.java jZ8#86/#{
* 1hQeuG
* Created on 2007年1月1日, 下午4:44 tb@&!a$`?
* i!jR>+
* To change this template, choose Tools | Options and locate the template under lrXi*u]
* the Source Creation and Management node. Right-click the template and choose UFoxv)
* Open. You can then make changes to the template in the Source Editor. tL!R^Tf
*/ CQ+WBTiC
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package com.tot.count; (t\
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/** ]"Qm25`Qz
* 1|c\^;cTkt
* @author 6fOh *
*/ #6%9*Rh
public class CountBean { ^l(Kj3gM
private String countType; `T]1u4^E
int countId; rfdT0xfcU
/** Creates a new instance of CountData */ 8=#J:LeXj
public CountBean() {} w9J^s<e
public void setCountType(String countTypes){ RI
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this.countType=countTypes; [aK7v{Wu
} Ew|VDD(.
public void setCountId(int countIds){ _m+64qG_8'
this.countId=countIds; ] hxE^/8 7
} (KF=v31_m
public String getCountType(){ P,ox))+6
return countType; E9L)dMZSpj
} +4,v.B@
public int getCountId(){ ^mu?V-4
return countId; >lRa},5(
} _k,/t10
} Z,~EH
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CountCache.java FYe(SV(9
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/* `n#
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* CountCache.java +H7lkbW
* _p~lL<q-K[
* Created on 2007年1月1日, 下午5:01 ;&N;6V"}
* }BpCa6SAs
* To change this template, choose Tools | Options and locate the template under lUR7zrwJ]o
* the Source Creation and Management node. Right-click the template and choose BN?OvQ
* Open. You can then make changes to the template in the Source Editor. ?>_[hZ
*/ WzC_M>_
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package com.tot.count; |G5Me
import java.util.*; ].j;d2xT\
/** m&H@f:
* ZPT6
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* @author Kug_0+gI
*/ U/e$.K3v
public class CountCache { "1P>,\Sjg
public static LinkedList list=new LinkedList(); ]0VjVU-
/** Creates a new instance of CountCache */ ?~;8Y=O
public CountCache() {} i9NUv3#
public static void add(CountBean cb){ ` R;6]/I?
if(cb!=null){ /GK1}h
list.add(cb); *)V1Sd#m
} MmjeFv
} RE72%w(oM
} Hvn{aLa.
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CountControl.java Wn(pz)+Y
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/* w+P?JR!)+
* CountThread.java u'o."J^&'
* Wb_'X |"u
* Created on 2007年1月1日, 下午4:57 Wgt[ACioN
* 36<PI'l#~
* To change this template, choose Tools | Options and locate the template under C>d_a;pX
* the Source Creation and Management node. Right-click the template and choose ~v2E<S3
* Open. You can then make changes to the template in the Source Editor. +w
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*/ A{5^A)$
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package com.tot.count; `Ns$HV
import tot.db.DBUtils; ]vJ]
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import java.sql.*; J!$q"0G'WT
/** ,~@Nhd~k
* ?F@0"qi
* @author hcvWf\4'#q
*/ t,*hxzD"
public class CountControl{ jXBAo
private static long lastExecuteTime=0;//上次更新时间 &TmN^R>
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 #PzRhanX
/** Creates a new instance of CountThread */ e5!LbsJv
public CountControl() {} -I$qe Xy
public synchronized void executeUpdate(){ >Cb[
Connection conn=null; Vf67gux
PreparedStatement ps=null; 4,o|6H
try{ 8._
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conn = DBUtils.getConnection(); L#Mul&r3x0
conn.setAutoCommit(false); YxEc(a"
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); LRqBP|bjCD
for(int i=0;i<CountCache.list.size();i++){ U2=PmS P
CountBean cb=(CountBean)CountCache.list.getFirst(); t;7 tuq
CountCache.list.removeFirst(); (p2jigP7a[
ps.setInt(1, cb.getCountId()); XY[uyR4Z
ps.executeUpdate();⑴ vI<n~FHt
//ps.addBatch();⑵ yG)zrRU
} S}q6CG7 u
//int [] counts = ps.executeBatch();⑶ ^Z:oCTOP
conn.commit(); 6!|-,t><
}catch(Exception e){ 2]Nc@wX`p
e.printStackTrace(); : Gp,d*M
} finally{ f$G{7%9*
try{ T+_pm DDN
if(ps!=null) { STDT]3.
ps.clearParameters(); '!)|;qe
ps.close(); iWbrX1
I+
ps=null; [NE:$@
} _S4 3_hW
}catch(SQLException e){} _b+=q:$/
DBUtils.closeConnection(conn); bk@F/KqL
} ~bSPtH
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} W}<'Y@[,
public long getLast(){ lg)jc3
return lastExecuteTime; (mHCK5
} 481SDG[b
public void run(){ .w/_Om4T*b
long now = System.currentTimeMillis(); l.ri]e
if ((now - lastExecuteTime) > executeSep) { |[ymNG
//System.out.print("lastExecuteTime:"+lastExecuteTime); S]kY'(V(*
//System.out.print(" now:"+now+"\n"); <r_L-
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); F;5S2:a@Z
lastExecuteTime=now; g$c\(isY;
executeUpdate(); m{(G%n>E&
} 'lPt.*Y<u
else{ vf=b5s(7Q
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 0ZY.~b'eu
} Ax*=kZmH|
} -!OFt}
}
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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 P8lx\DA
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类写好了,下面是在JSP中如下调用。 |!VSed#FSn
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<% Sm6hyZFy
CountBean cb=new CountBean(); 39jnoT
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); FL}k0
CountCache.add(cb); 6I0G.N
out.print(CountCache.list.size()+"<br>"); *U vh;d{
CountControl c=new CountControl(); H1`}3}"
c.run(); /&g5f4[|p
out.print(CountCache.list.size()+"<br>"); *~~&*&+
%>