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: ^:{l~~9iKp
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CountBean.java -M%n<,XN0
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/* q6H90Zb
* CountData.java !rTh+F*
* $Jb+}mlT
* Created on 2007年1月1日, 下午4:44 W zy8
* NkNw9?:#4
* To change this template, choose Tools | Options and locate the template under bi#o1jR
* the Source Creation and Management node. Right-click the template and choose o2a`4K
* Open. You can then make changes to the template in the Source Editor. Kk9 JZ[nT'
*/ 7S2Bm]fP
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package com.tot.count; %9{4g->
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/** BI4p 3-
* ^4B6IF*
* @author yK"U:X
*/ c{|soc[#
public class CountBean { #(ANyU(#e
private String countType; =ZzhH};aX
int countId; r^WO$u|@i
/** Creates a new instance of CountData */ <X|"5/h
public CountBean() {} 2x$\vL0
public void setCountType(String countTypes){ (tyo4Tz1
this.countType=countTypes; (V{bfDu&h@
} r{>tTJFD(:
public void setCountId(int countIds){ >/5D/}4
this.countId=countIds; ;`X -.45
} kl3#&>e
public String getCountType(){ dE/Vl/ :
return countType; kW6}57iV
} 2}~1poyi>
public int getCountId(){ ',m,wp`
return countId; 'e;*V$+
} [A*vl9=
} 7lR(6ka&/
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CountCache.java EJdq"6S
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/* *7BY$q
* CountCache.java Q}\,7l
* 7 &GhJ^Ku
* Created on 2007年1月1日, 下午5:01
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* 6S"bW)O
* To change this template, choose Tools | Options and locate the template under r;upJbSX
* the Source Creation and Management node. Right-click the template and choose o=;.RYi
* Open. You can then make changes to the template in the Source Editor. ik7#Og~3
*/ gq Z7Pro.
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package com.tot.count; ;)"r^M)):
import java.util.*; s![=F}ck
/** 5A~w_p*}
* 3w!oJB
* @author 1hi^
*/ \&ERSk2
public class CountCache { GlQ=M )E
public static LinkedList list=new LinkedList(); aH'^`]'_=
/** Creates a new instance of CountCache */ /\
~{
public CountCache() {} V%Y.N4H
public static void add(CountBean cb){ zrnc~I+
if(cb!=null){ ax>en]rNP
list.add(cb); ]y-r
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} 4J94iI>S.l
} jDH)S{k
} !Q#u
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CountControl.java u`E_Q8
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/* *J1pxZ^
* CountThread.java *DDfdn
* ;E*^AW
* Created on 2007年1月1日, 下午4:57
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* RDzL@xCcn
* To change this template, choose Tools | Options and locate the template under ``aoLQc`
* the Source Creation and Management node. Right-click the template and choose >%Y.X38Z[
* Open. You can then make changes to the template in the Source Editor. ,A[HYc|uy
*/ ]vKxgfF
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package com.tot.count; YwB5Zqr
import tot.db.DBUtils; GN=F-*2
import java.sql.*; ~;bwfp_
/** w<\N-J|m
* O}IS{/^7
* @author bsqoR8
*/ +/x|P-
public class CountControl{ ~X`vRSrH
private static long lastExecuteTime=0;//上次更新时间 f4!^0%l
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 8b6:n1<fn
/** Creates a new instance of CountThread */ F^`sIrZvs
public CountControl() {} P5] cEZ n
public synchronized void executeUpdate(){ g&_0)(a\
Connection conn=null; -bo0!@MK
PreparedStatement ps=null; ~5p
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try{ [}P|OCW
conn = DBUtils.getConnection(); EMs$~CL4
conn.setAutoCommit(false); t@4X(i0
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 1DZGb)OU
for(int i=0;i<CountCache.list.size();i++){ -VRu^l#
CountBean cb=(CountBean)CountCache.list.getFirst(); TN/I(pkt1B
CountCache.list.removeFirst(); L d#
ps.setInt(1, cb.getCountId()); sI*( MhU
ps.executeUpdate();⑴ Z!LzyCVl
//ps.addBatch();⑵ Szwa2IdI.
} F!zZIaB]
//int [] counts = ps.executeBatch();⑶ , aawtdt/
conn.commit(); aASnk2DFd
}catch(Exception e){ pC#Z]_k
e.printStackTrace(); LNg[fF^:
} finally{ 3b%y+?-{\u
try{ W=F?+KgL
if(ps!=null) { I&1Mh4yu
ps.clearParameters(); i}+dctg/
ps.close(); (_<ruwV]`
ps=null; :Tj,;0#/
} Y;-" Z
}catch(SQLException e){} 4:6@9.VVT
DBUtils.closeConnection(conn); {/R4Q1
} NbkWy
} EWH'x$z_q
public long getLast(){ 7J$ ^R6rh
return lastExecuteTime; G
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} n6|}^O7
public void run(){ __3Cjo^6&
long now = System.currentTimeMillis(); @["Vzg!I6"
if ((now - lastExecuteTime) > executeSep) { y}#bCRy~.A
//System.out.print("lastExecuteTime:"+lastExecuteTime); D}b+#G(m[
//System.out.print(" now:"+now+"\n"); eN}FBX#'
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); zZ;tSKL
lastExecuteTime=now; 7(gQ6?KsZ
executeUpdate(); i 3(bg,
} d&R/f Im
else{ I&>R]DV
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); y1k""75
} dzbzZ@y
} CHBCi) '6h
} xwK<f6H!y
//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 Y*J`Wf(w
d/R:-{J)c
类写好了,下面是在JSP中如下调用。 9RR1$( f
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<% HnOp*FP
CountBean cb=new CountBean(); kw=+"U
cb.setCountId(Integer.parseInt(request.getParameter("cid")));
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CountCache.add(cb); 7cvbYP\<lv
out.print(CountCache.list.size()+"<br>"); sVh!5fby&
CountControl c=new CountControl(); kFuaLEJi
c.run(); gI\J sN
out.print(CountCache.list.size()+"<br>"); 3+n&Ya1
%>