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: 6P;o 6s
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CountBean.java 7fTxGm
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/* -|m$YrzG
* CountData.java #_.g2 Y
* koOy Z>
* Created on 2007年1月1日, 下午4:44 jrm0@K+<IA
* ?SC3Vzr
* To change this template, choose Tools | Options and locate the template under uu}a:qrY
* the Source Creation and Management node. Right-click the template and choose 1P_Fe[8
* Open. You can then make changes to the template in the Source Editor. 5ZnSA9?
*/ Y 3o^Euou
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package com.tot.count; =m`l%V[
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/** [O=W>l
* "A%MVym."
* @author 9;=q=O/
*/ Ur^YG4(
public class CountBean { C/F@ ]_y
private String countType; L)q`D2|'
int countId; Uh|TDuM
/** Creates a new instance of CountData */ ]{YN{
public CountBean() {} !L4dUMo
public void setCountType(String countTypes){ Dba+z-3Nzy
this.countType=countTypes; H}vn$$
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} VR"u*
public void setCountId(int countIds){ hIR@^\?
this.countId=countIds; qh%i5Mu
} oG!6}5
public String getCountType(){ "?$L'!bM@
return countType; A&N$tH
} !q!"UMiG
public int getCountId(){ ,#
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return countId; $zdd=.!KiK
} T`uDlo
} wi>DZkR
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CountCache.java dIma{uv
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/* g{e/X~
* CountCache.java 21U&Ww
* >yX/+p_
* Created on 2007年1月1日, 下午5:01 FIH@2zA
* WPIZi[hBs
* To change this template, choose Tools | Options and locate the template under &9RH}zv6
* the Source Creation and Management node. Right-click the template and choose 5i6VZv
* Open. You can then make changes to the template in the Source Editor. (I[s3EnhS
*/ > 84e`aGE
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package com.tot.count; *t^eNUA
import java.util.*; NN^QUB
/** "c6<zP
* bV_j`:MD
* @author i&JpM]N
*/ +vf:z?I8
public class CountCache { YUCC*t
public static LinkedList list=new LinkedList(); JRq3>P
/** Creates a new instance of CountCache */ >z QNHSi
public CountCache() {} Uls+n@\!
public static void add(CountBean cb){ DE%fF,Hk3
if(cb!=null){ VrVDm*AGQ
list.add(cb); @a0Q0M
} 975
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} xpAok]
} ^CUSlnB\(
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CountControl.java ^_sQG
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/* [P{a_(
* CountThread.java )AI?x@
* "TfI+QgLF
* Created on 2007年1月1日, 下午4:57 <KX&zi<L)
* u\f3qc,]F
* To change this template, choose Tools | Options and locate the template under ?IILt=)<
* the Source Creation and Management node. Right-click the template and choose iUTU*El>
* Open. You can then make changes to the template in the Source Editor. tU{\ev$x
*/ 8fh4%#,C%
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package com.tot.count; 44~hw:
import tot.db.DBUtils; zZ:xEc
import java.sql.*; w-ALCh8o
/** 33 :@*
* yplG18
* @author D*QYKW=)
*/ D^|9/qm$
public class CountControl{ grspt}
private static long lastExecuteTime=0;//上次更新时间 t{zBC?cR
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 *jE;9^
/** Creates a new instance of CountThread */ h48YDWwy
public CountControl() {} QXs8:;T
public synchronized void executeUpdate(){ q6REh;$
Connection conn=null; CcY7$D
PreparedStatement ps=null; l[oe*aYN7
try{ Lc|{aN
conn = DBUtils.getConnection(); P6.!3%y
conn.setAutoCommit(false); T cJ$[
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); tb,9a!?
for(int i=0;i<CountCache.list.size();i++){ P\AqpQv
CountBean cb=(CountBean)CountCache.list.getFirst(); t+O e)Ns
CountCache.list.removeFirst(); ,:UX<6l
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ps.setInt(1, cb.getCountId()); q_sEw~~@!
ps.executeUpdate();⑴ i $C-)d]
//ps.addBatch();⑵ lI6W$V\,
} &n>7Ir
//int [] counts = ps.executeBatch();⑶ nR[^|CAR
conn.commit(); rEM#D]k
}catch(Exception e){ at|
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e.printStackTrace(); t"|DWC*
} finally{ [1SMg$@<
try{ |cgui
if(ps!=null) { cS(;Qs]Q
ps.clearParameters(); G>K@AW#
ps.close(); 0e16Ow6\!1
ps=null; 8vSIf+
} hF>u)%J/S
}catch(SQLException e){} Juu+vMn1
DBUtils.closeConnection(conn); R%"K
} Vm,,uF
} OhFW*v
public long getLast(){ "(f`U.
return lastExecuteTime;
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} RgZOt[!.
public void run(){ nZ
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long now = System.currentTimeMillis(); +D`*\d1
if ((now - lastExecuteTime) > executeSep) {
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//System.out.print("lastExecuteTime:"+lastExecuteTime); ),`8eQC
//System.out.print(" now:"+now+"\n"); v+6e;xl8
// System.out.print(" sep="+(now - lastExecuteTime)+"\n");
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lastExecuteTime=now; :G=FiC
executeUpdate(); 50$W0L$
} vy9dAl
else{ ]iVLHVqz
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); /iG7MC\`
} p!DP`Ouc3\
} =wrP:wYF
} RB$
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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 [Y8S[YY
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类写好了,下面是在JSP中如下调用。 Wekqn!h
#^0(
<% 9]7u_
CountBean cb=new CountBean(); h/m6)m.D
cb.setCountId(Integer.parseInt(request.getParameter("cid")));
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CountCache.add(cb); v* ~3Z1
out.print(CountCache.list.size()+"<br>"); izuF !9
CountControl c=new CountControl(); H
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c.run(); T1bd:mC}n
out.print(CountCache.list.size()+"<br>"); kO_5|6
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