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: BmccSC;o4
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CountBean.java qBh@^GxY),
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/* bR~(Ry`
* CountData.java _;Xlw{FN^
* )z18:C3
* Created on 2007年1月1日, 下午4:44 @U1|?~M%s
* r=vY-p
* To change this template, choose Tools | Options and locate the template under 5$HG#2"Kb#
* the Source Creation and Management node. Right-click the template and choose R9#ar{
* Open. You can then make changes to the template in the Source Editor. ~_N,zw{x
*/ bu_@A^ys
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package com.tot.count; U1E@pDH
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/** 2rf8)8':
* n8_X<jIp3
* @author =N{?ll6x7g
*/ :l!sKT?:d!
public class CountBean { /#(IV_Eol
private String countType; yI#qkl-
int countId; jl(D;JnF
/** Creates a new instance of CountData */ E QU@';~8
public CountBean() {} fDplYn#
public void setCountType(String countTypes){ *ls6k`ymL
this.countType=countTypes; .!Z5A9^
} FA)ot)]
public void setCountId(int countIds){ 0Ui_Trlc
this.countId=countIds; ecJjE
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} 1hgIR^;[b
public String getCountType(){ ,pdzi9@=t
return countType; &y=OZ
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} 3%1wQXr0
public int getCountId(){ mI4GBp
return countId; hZL!%sL7
} vo\'ycPv
} R.HvqO
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CountCache.java ht ]n*
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/* 1+N'cB!y
* CountCache.java ]GY8f3~|{
* 8Nyz{T[
* Created on 2007年1月1日, 下午5:01 'iZwM>l\
* [ij) k@.
* To change this template, choose Tools | Options and locate the template under \ moLQ
* the Source Creation and Management node. Right-click the template and choose {nUmlP=mS
* Open. You can then make changes to the template in the Source Editor. ^\Q,ACkZb
*/ 2)|=+DN;
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package com.tot.count; jLI1Ed
import java.util.*; 2\k!DF
/** \y=28KKc:c
* zNrn|(Y%Y
* @author Q5Nbu90
*/ 3!gz^[!?EN
public class CountCache { (:`4*xK
public static LinkedList list=new LinkedList(); JU^Y27
/** Creates a new instance of CountCache */ VV/T)qEe7>
public CountCache() {} /4pYhJ8S
public static void add(CountBean cb){
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if(cb!=null){ t`|Rn9-
list.add(cb); @YH>|{S&
} 4_j_!QH87
} [#Gu?L_W
} @#t<!-8d
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CountControl.java .`+~mQ
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/* ]J!#"m-]
* CountThread.java {Hl(t$3V`
* U=
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* Created on 2007年1月1日, 下午4:57 h~Z &L2V
* zc;kNkV#1Y
* To change this template, choose Tools | Options and locate the template under 1)
2-UT
* the Source Creation and Management node. Right-click the template and choose V
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* Open. You can then make changes to the template in the Source Editor. f['lY1#V1
*/ 6c-'CW
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package com.tot.count; $A{$$8P
import tot.db.DBUtils; s-Yu(X2
import java.sql.*; <|Lz#iV37
/** [u K,.G
* UV}:3c6 ZX
* @author :M{
)&{D
*/ HP[B%
public class CountControl{ 4vG-d)"M2
private static long lastExecuteTime=0;//上次更新时间 O4oN)
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 'R+^+urq^
/** Creates a new instance of CountThread */ VpHwc!APq
public CountControl() {} DGCvH)Q
public synchronized void executeUpdate(){ ((`{-y\K
Connection conn=null; e#h&Xa
PreparedStatement ps=null; ;0oL*d[1Z
try{ JB'tc!!*
conn = DBUtils.getConnection(); Ji!i}UjD7!
conn.setAutoCommit(false); i_AD3Jrs
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Y96<c" t
for(int i=0;i<CountCache.list.size();i++){ eF{uWus
CountBean cb=(CountBean)CountCache.list.getFirst(); v+Y^mV`|
CountCache.list.removeFirst(); AU`z.Isf
ps.setInt(1, cb.getCountId()); E8sM`2z5
ps.executeUpdate();⑴ I
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//ps.addBatch();⑵ T|S-?X,
} rqN+0CT
//int [] counts = ps.executeBatch();⑶ |z_Dw$-xm
conn.commit(); 5 cQ]vb
}catch(Exception e){ jmv=rl>E*
e.printStackTrace(); J0R{|]W8
} finally{ 8w[O%
try{ F1$XUos9
if(ps!=null) { L{>rN`{
ps.clearParameters(); ~?b1x+soV
ps.close(); ,.*Df)+
ps=null; ",gVo\^
} j1{`}\e
}catch(SQLException e){} }6%\/d1~ 6
DBUtils.closeConnection(conn); t-C|x)J+
} ]Bf1p
} >E4,zs@7t
public long getLast(){ |iBf6smF
return lastExecuteTime; CT|0KB&
} UQh.o
public void run(){ wAi7jCY%OY
long now = System.currentTimeMillis(); (&Q!5{$W
if ((now - lastExecuteTime) > executeSep) { y,&[OrCm^\
//System.out.print("lastExecuteTime:"+lastExecuteTime); &4WA/'>R
//System.out.print(" now:"+now+"\n"); }15&<s
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Wll0mtv
lastExecuteTime=now; UYZC% $5x
executeUpdate(); UIf#Gy|l
} (NR( )2
else{ `&fW<5-
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =d5;F`m
} >T[Y>]
} `fEzE\\!*
} [|*7"Q(
//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 u?SwGXi~8
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类写好了,下面是在JSP中如下调用。 tk'&-v'h
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<% mk~CE
CountBean cb=new CountBean(); MhE".ZRd
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 7oIHp_Zq
CountCache.add(cb); {RI^zNgs[
out.print(CountCache.list.size()+"<br>"); lbovwj
CountControl c=new CountControl(); (
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c.run(); ;5\'PrE
out.print(CountCache.list.size()+"<br>"); mGDc,C=5:
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