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: !M)] 1Y
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CountBean.java oO7)7$|1
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/* ;gAL_/_
* CountData.java M(C$SB>
* {wk#n.c
* Created on 2007年1月1日, 下午4:44 5-H"{29
* A@Zqh<,Ud
* To change this template, choose Tools | Options and locate the template under $Fi1Bv)
* the Source Creation and Management node. Right-click the template and choose e%)MIAS0
* Open. You can then make changes to the template in the Source Editor. )lz)h*%#
*/ b5.]}>]t
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package com.tot.count; $*:$-
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/** Q.3:"dT
* OwNo$b]h`
* @author sk:B;.z
*/ [wJ\.9<Oa
public class CountBean { t.\Pn4
private String countType; o9C#5%9
int countId; %2B1E( r%M
/** Creates a new instance of CountData */ KLuOg$i
public CountBean() {} U9Ea}aN
public void setCountType(String countTypes){ $-jj%kS
this.countType=countTypes; `PI*\t0
} %] :ZAmN
public void setCountId(int countIds){ G^.tAO5:f
this.countId=countIds; H4T~Kv
}
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public String getCountType(){ Bva2f:)K|
return countType; D#`>p
} zMO#CZ t
public int getCountId(){ f+1'Ah0'E
return countId; gq4X(rsyD
} f#7=N{wm
} Lp4F1H2t-
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CountCache.java IGlyx'\_
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/* f/\S:x-B
* CountCache.java ""_G4{
* M"qS#*{
* Created on 2007年1月1日, 下午5:01 0V^I.S/q
* } *C
* To change this template, choose Tools | Options and locate the template under iE_[]Vgc
* the Source Creation and Management node. Right-click the template and choose SkCux
* Open. You can then make changes to the template in the Source Editor. o-AF_N
*/ gh
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package com.tot.count; _V0%JE'
import java.util.*; .Y8P6_
/** + 660/ e8N
* Of$R+n.
* @author `CBXz!v!O
*/ ukc
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public class CountCache { :qj;f];|
public static LinkedList list=new LinkedList(); B%kC>J
/** Creates a new instance of CountCache */ EwuRIe;D
public CountCache() {} >ZeARCf"f
public static void add(CountBean cb){ esQ`6i
if(cb!=null){ N[fwd=$\#
list.add(cb); ]%FP*YU4O
} ^Pu:&:ki
} >msQ@Ch
} h;y}g/HZ
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CountControl.java PBFpV8P,
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/* >Bdh`Ot-!
* CountThread.java U}k@%m,
* '$'a .q1q9
* Created on 2007年1月1日, 下午4:57 H!OX1F
* lFSvHs5
* To change this template, choose Tools | Options and locate the template under 1w7XM0SHcn
* the Source Creation and Management node. Right-click the template and choose mE>{K
* Open. You can then make changes to the template in the Source Editor. \7#w@3*
*/ W,H=K##6<
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package com.tot.count; w:iMrQeJg
import tot.db.DBUtils; wPu.hVz
import java.sql.*; 'jO8C2Th%
/** TA:uB[Ji
* xO<%lq`
* @author zxH<~2
*/ +xsGa{`
public class CountControl{ UIg?3J}R
private static long lastExecuteTime=0;//上次更新时间 kzNRRs\e
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Z#(Y%6[u
/** Creates a new instance of CountThread */ suW|hh1/Ya
public CountControl() {} ~x+'-2A46
public synchronized void executeUpdate(){ )R?uzX^qf
Connection conn=null; 7/k7V)
PreparedStatement ps=null; p5w9X+G%
try{ ja/wI'J<
conn = DBUtils.getConnection(); 9V&+xbR&
conn.setAutoCommit(false); !<VP[%2L~
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2Oyw#1tdn
for(int i=0;i<CountCache.list.size();i++){ \/gf_R_GN
CountBean cb=(CountBean)CountCache.list.getFirst(); _*8 6
CountCache.list.removeFirst(); *:"60fkoU
ps.setInt(1, cb.getCountId()); f&$;iE
ps.executeUpdate();⑴ in,0(I&I
//ps.addBatch();⑵ }Qe(6'l_
} 0R`>F">
//int [] counts = ps.executeBatch();⑶ P>)J:.tr0
conn.commit(); 7+@-mJMP$D
}catch(Exception e){ 1>Vq<z
e.printStackTrace(); L;L_$hu)
} finally{ H"k\(SPVS
try{ x
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if(ps!=null) { eT5IL(mH
ps.clearParameters(); I@O9bxR?
ps.close(); *zDDi(@vtK
ps=null; o"L8n(\
} "rEfhzmyF
}catch(SQLException e){} BD}%RTeWKq
DBUtils.closeConnection(conn); #f_'&m
} ZqpK}I
} =OV5DmVmQ
public long getLast(){ s'l|Ii
return lastExecuteTime; gW4fwE^
} Z)=S>06X Q
public void run(){ =3SJl1w1
long now = System.currentTimeMillis(); $UK m[:7
if ((now - lastExecuteTime) > executeSep) { +|8.ymvm
//System.out.print("lastExecuteTime:"+lastExecuteTime); b\o>4T
//System.out.print(" now:"+now+"\n"); V*(x@pF
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 1q5S"=+W[
lastExecuteTime=now; Lc[TIX
executeUpdate(); i^Jw`eAmT
} OT=1doDp
else{ Jg{K!P|i
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); u>agVB4\F
} ,,80nW9E
} 1|ddG010
} n_LK8
//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 XkoPN]0n
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类写好了,下面是在JSP中如下调用。 vkR~nIp
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<% K^tc]ZQ
CountBean cb=new CountBean(); C0Fd<