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: RA67w&
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CountBean.java 6x8|v7cMH
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/* %d\+(:uu/
* CountData.java A8Y~^wn
* T`[ZNq+${
* Created on 2007年1月1日, 下午4:44 )`7h,w
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* 5R
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* To change this template, choose Tools | Options and locate the template under ^TK)_wx
* the Source Creation and Management node. Right-click the template and choose :e vc
* Open. You can then make changes to the template in the Source Editor. /! G0 g%k
*/ ~,7R*71
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package com.tot.count; hKeh9 Bt
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/** v]S8!wU
* bZfJG^3
* @author %,RU)}
*/ Bn:sN_N
public class CountBean { $ayD55W4
private String countType; ?,>y`Qf*|
int countId; ?C\9lLX
/** Creates a new instance of CountData */ B6&Mtm1
public CountBean() {} sg\jC#
public void setCountType(String countTypes){ nK=V`
this.countType=countTypes; SJ@_eir\o
} `"4EE}eQc
public void setCountId(int countIds){ 6*
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this.countId=countIds; P .( X]+
} Us.jyg7_c
public String getCountType(){ @S):a`J
return countType; <Ux;dekz}
} :gv#_[k
public int getCountId(){ 8G<.5!f7`N
return countId; `rQl{$9IC
} an~Kc!Oki
}
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CountCache.java IQ8AsV&'C
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/* !I&Sy]G
* CountCache.java z0Hh8*
* 0l*/_;wo
* Created on 2007年1月1日, 下午5:01 MLX.MUS
* K.Z{4x=0
* To change this template, choose Tools | Options and locate the template under VUy
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* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. 0T;WN$W|
*/ &Y$rVBgQ
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package com.tot.count; +^:K#S9U
import java.util.*; 1cega1s3xR
/** HR
* ysPW<
* @author 24fWj?A| ^
*/ { q<l]jn9
public class CountCache { v>R.ou(
public static LinkedList list=new LinkedList(); =c'LG
/** Creates a new instance of CountCache */ A:Z:&(NtE:
public CountCache() {} K.~U%v}
public static void add(CountBean cb){ #$E
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if(cb!=null){ ,5:86'p
list.add(cb); +0DIN4Y(4
} ~JiA
} Fy^\U w
} uv!/DX#
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CountControl.java \=~Ap#Mpc4
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/* %e(,PL
* CountThread.java 7 &Aakl
* gK'MUZ()
* Created on 2007年1月1日, 下午4:57 rO GJ%|%(
* 3}Pa,uN
* To change this template, choose Tools | Options and locate the template under Xs/hqIXB
* the Source Creation and Management node. Right-click the template and choose K(^x)w r-:
* Open. You can then make changes to the template in the Source Editor. }2S \-
*/ oCS NA.z
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package com.tot.count; bMYRQ,K`C
import tot.db.DBUtils; D~} 4N1
import java.sql.*; qMkP/BjV
/** [(mq8Nb
* $n W>]S\|
* @author A
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*/ 4w,}1uNEf
public class CountControl{ 5I14"Qf
private static long lastExecuteTime=0;//上次更新时间 $.kYAsZts
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 gFH_^~7i8p
/** Creates a new instance of CountThread */ {ig@Iy~DT
public CountControl() {} |j<'[gB\p
public synchronized void executeUpdate(){ Hw
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Connection conn=null; Gmb57z&:
PreparedStatement ps=null; t
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try{ 6~s,j({^
conn = DBUtils.getConnection(); iu .{L(m
conn.setAutoCommit(false); NKRXY~zHh
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 7~&Y"&
for(int i=0;i<CountCache.list.size();i++){ ~Y(M>u.+!
CountBean cb=(CountBean)CountCache.list.getFirst(); @?U5t1O<
CountCache.list.removeFirst(); @tA.^k0`
ps.setInt(1, cb.getCountId()); S^u!/ =&
ps.executeUpdate();⑴ v3p..A~XZ.
//ps.addBatch();⑵ j.K yPWO
} ':=C2x1d|
//int [] counts = ps.executeBatch();⑶ t65!2G"<
conn.commit(); \ gN) GR
}catch(Exception e){ |w5#a_adM
e.printStackTrace(); <}=D ?bXw
} finally{ $lQi0*s
try{ /D q]=P
if(ps!=null) {
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ps.clearParameters(); (bw;zNW
ps.close(); 2:abe
ps=null; R[(,wY_1
} U6Qeode
}catch(SQLException e){} {2nXItso
DBUtils.closeConnection(conn); :A$6Y*s\
} ^$(|(N[;
} BC+HP9<]
public long getLast(){ Dj|S
return lastExecuteTime; I4hr5M3
} 4Y]`> ;w
public void run(){ =P!Vi6[gF~
long now = System.currentTimeMillis(); -}(W=r\
if ((now - lastExecuteTime) > executeSep) { C9z{8 ;
//System.out.print("lastExecuteTime:"+lastExecuteTime); OKP?^%kD
//System.out.print(" now:"+now+"\n"); &+
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); JjwuxZVr O
lastExecuteTime=now; ><=af 9T
executeUpdate(); [Xrq+O,
} cE3co(j
else{ 5IepVS(>?v
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); g^idS:GtX5
} LCG<
} _YY)-H
} }LRAe3N%8
//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 I4*N
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类写好了,下面是在JSP中如下调用。 sw&Qks?V
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<% u32<=Q[
CountBean cb=new CountBean(); zb<+x(0y"
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); [H&m@*UO
CountCache.add(cb); kK(633s
out.print(CountCache.list.size()+"<br>"); )sQbDA|p
CountControl c=new CountControl(); Ub"\LUu
c.run(); 8c~H![2u
out.print(CountCache.list.size()+"<br>"); @EQ{lGpU3
%>