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: 4X5Tyv(Dp
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CountBean.java 6tBh`nYB=
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/* Po=@
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* CountData.java YlY3C
* kh'R/Dt
* Created on 2007年1月1日, 下午4:44 xfE:r:
* .>{.!a
* To change this template, choose Tools | Options and locate the template under 7Qc
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* the Source Creation and Management node. Right-click the template and choose !M[a/7x,p
* Open. You can then make changes to the template in the Source Editor. ;U^7]JO;
*/ 5ecAev^1-
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package com.tot.count; f[bx|6
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/** cS'|c06
* K`25G_Y3@
* @author X R =^zp?
*/ yE \dv)(<
public class CountBean { >c~Fgs
private String countType; Q0}Sju+HX
int countId; YMSA[hm
/** Creates a new instance of CountData */ 6S~lgH:
public CountBean() {} U# jbii6e
public void setCountType(String countTypes){ "s6O|=^*
this.countType=countTypes; 42Gv]X
} ^h :%%\2
public void setCountId(int countIds){ jE!W&0
this.countId=countIds; whzV7RT
} Z|z+[V}[
public String getCountType(){ `qjiC>9
return countType; pV3o\bk!
} V ?10O
public int getCountId(){ fFHT`"bD:
return countId; ~;f,Ad`Q
} } h.]sF
} fh1rmet&Ts
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CountCache.java d0`5zd@S
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/* k_2W*2'S
* CountCache.java FK$?8Jp
* &s|&cT
* Created on 2007年1月1日, 下午5:01 .[Z<r>
* Felu`@b
* To change this template, choose Tools | Options and locate the template under 9Okb)K95
* the Source Creation and Management node. Right-click the template and choose QzwA*\G
* Open. You can then make changes to the template in the Source Editor. ~olta\|
*/ k-v@sb24_
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package com.tot.count; *uLlf'qU]
import java.util.*; i_? S#L]h
/** O;NQJ$^bI
* 2VNMz[W'
* @author v$O%U[e<
*/ \`|*i$
public class CountCache { )V}u}5
public static LinkedList list=new LinkedList(); uKI2KWU?2
/** Creates a new instance of CountCache */ 6QCU:2IiL
public CountCache() {} BCE}Er&
public static void add(CountBean cb){ i#@3\&{J>
if(cb!=null){ v.08,P{b
list.add(cb); Y6|8;2E
} p~T)Af<(
} D3^Yc:[_@
} f?iQ0wv)
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CountControl.java ;OlC^\e
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/* t\hvhcbL
* CountThread.java \X=?+|
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* K%) K$/A
* Created on 2007年1月1日, 下午4:57 'NM$<<0
* y%X{[F
* To change this template, choose Tools | Options and locate the template under Ie#LZti
* the Source Creation and Management node. Right-click the template and choose @
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* Open. You can then make changes to the template in the Source Editor. %|l^oC+E
*/ ,= ;d<O8
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package com.tot.count; .c[v /SB]
import tot.db.DBUtils; PKoB~wLH
import java.sql.*; <z3:*=!
/** 3[RbVT
* cO,ELu
* @author j5*W[M9W
*/ ;:JTb2xbb
public class CountControl{ v2>.+Eh#
private static long lastExecuteTime=0;//上次更新时间 pPUv8, %
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 HWFI6N
/** Creates a new instance of CountThread */ w6k\po=
public CountControl() {} lNcXBtwK@#
public synchronized void executeUpdate(){ 2=3pV!)4}
Connection conn=null; IK%fX/tDyc
PreparedStatement ps=null; f^8,Z+n
try{ p}qNw`
conn = DBUtils.getConnection(); C.r9)#G
conn.setAutoCommit(false); "#T3l^@
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 1C [j:Ly/
for(int i=0;i<CountCache.list.size();i++){ ~.;S>o[
CountBean cb=(CountBean)CountCache.list.getFirst(); tL?nO#Qx
CountCache.list.removeFirst(); #x"dWi(
ps.setInt(1, cb.getCountId()); #]ZOi`;
ps.executeUpdate();⑴ %&L]k>n^
//ps.addBatch();⑵ VU1;ZJE
} 6vVx>hFJ47
//int [] counts = ps.executeBatch();⑶ O`nrXC{
conn.commit(); <lHelX=/
}catch(Exception e){ V9:h4]
e.printStackTrace(); DP=4<ES%+
} finally{ n3, ?klK
try{ y*,3P0*z
if(ps!=null) { <<@vy{*Hg
ps.clearParameters(); eMPkk=V
ps.close(); Zy BN o]
ps=null; fL9R{=I%
} -G<$wh9~3
}catch(SQLException e){} F&r+"O)^-R
DBUtils.closeConnection(conn); $`:/OA<.
} S/j~1q_|G
} <(Ub(
public long getLast(){ rs$sAa*f
return lastExecuteTime; +kF$I7LN
} =(kwMJ
public void run(){ (>*<<a22
long now = System.currentTimeMillis(); qGtXReK
if ((now - lastExecuteTime) > executeSep) { Xp<RGp7E
//System.out.print("lastExecuteTime:"+lastExecuteTime); @ \ip?=
//System.out.print(" now:"+now+"\n"); ;H5H7ezV
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 3%Jg' Tr+
lastExecuteTime=now; d[+ xLa
executeUpdate(); [4:_6vd7X
} V#;6<H"
else{ H
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); V\8vJ3.YV
} ' bio:1
} C'C'@?]
} SRq0y,d
//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 OM!CP'u#{
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类写好了,下面是在JSP中如下调用。 [\NyBc
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<% >#z*gCO5,
CountBean cb=new CountBean(); pEIc?i*
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); rf"%D<bb
CountCache.add(cb); unqX<6hu
out.print(CountCache.list.size()+"<br>"); f $MVgX
CountControl c=new CountControl(); <>,V>k|
c.run(); AY['!&T
out.print(CountCache.list.size()+"<br>"); "(/
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