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: '|^:,@8P9
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CountBean.java ([u|j
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/* |0y#} |/
* CountData.java U@mznf* J
* RQx8Du<
* Created on 2007年1月1日, 下午4:44 %7)=k}4
* p?rlx#M
* To change this template, choose Tools | Options and locate the template under YNU}R/u6^
* the Source Creation and Management node. Right-click the template and choose 7R2O[=Szq
* Open. You can then make changes to the template in the Source Editor. ,94<j,"
*/ zzQWHg]/
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package com.tot.count; U4pIRa)S
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/**
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* (G>[A}-
* @author ;[sW\Ou
*/ S }`sp[6
public class CountBean { d qn5G!fI
private String countType; a[O6xA%
int countId; 1q;v|F
/** Creates a new instance of CountData */ d]l8ei@>h
public CountBean() {} e{P v:jl
public void setCountType(String countTypes){ WKEb
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this.countType=countTypes; dq[h:kYm
} FLqN3D=yQ
public void setCountId(int countIds){ C8}:z\A_@Z
this.countId=countIds; }9'`3vsJ
} :jLL IqhB
public String getCountType(){ q!5:M\
return countType; %SM;B-/zHt
} +J X;T(T
public int getCountId(){ g\JJkXjD#
return countId; @LKQ-<dZG
} (CmK>"C+
} >M,oyM"s
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CountCache.java *glZb;_
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/* h4?x_"V"
* CountCache.java FRBu8WW0L
* )u)=@@k21
* Created on 2007年1月1日, 下午5:01 &7aWVKon
* e`D}[G#
* To change this template, choose Tools | Options and locate the template under /~[Lr
* the Source Creation and Management node. Right-click the template and choose 6Xlzdt
* Open. You can then make changes to the template in the Source Editor. nVb@sI{{k
*/ 0mY Y:?v
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package com.tot.count; ,S8 K!
import java.util.*; @w[i%F,&`
/** iq(PC3e`V
* 'pdTV:]zA
* @author XIHN6aQ{X
*/ _!\d?]Ya
public class CountCache { +2~kHrv
public static LinkedList list=new LinkedList(); V2YK T,5
/** Creates a new instance of CountCache */ (jgk !
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public CountCache() {} !_<6}:ZB
public static void add(CountBean cb){ 0s#72}n
if(cb!=null){ %@/^UE:
list.add(cb); xP9(J
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} >H2`4]4]
} T~TP
} 3$$E0`7.
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CountControl.java +K57. n{
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/* NO"PO
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* CountThread.java *Z5^WHwg
* >:;dNVz
* Created on 2007年1月1日, 下午4:57 /Rp]"S
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* *Gbhk8}V'
* To change this template, choose Tools | Options and locate the template under ^.SYAwL
* the Source Creation and Management node. Right-click the template and choose hvd}l8
* Open. You can then make changes to the template in the Source Editor. )*,/L <
*/ C$3*[
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package com.tot.count; y7R#PkQ~
import tot.db.DBUtils; BT$p~XB
import java.sql.*; L[` l80
/** KhCP9(A=Qo
* ]rmBM
* @author h~MV=7
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*/ ^[L(kHOGzk
public class CountControl{
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private static long lastExecuteTime=0;//上次更新时间 [uq>b|`RG
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 0&.CAHb}
/** Creates a new instance of CountThread */ ]Z JoC!u
public CountControl() {} v0^9"V:y
public synchronized void executeUpdate(){ c}x1-d8
Connection conn=null; ::L2zVq5V
PreparedStatement ps=null; =BsV`p7rU
try{ B~Q-V&@o
conn = DBUtils.getConnection(); [&Xp]:M'D
conn.setAutoCommit(false); B[vj X"yg
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); BxY t*b%
for(int i=0;i<CountCache.list.size();i++){ %B3~t>
CountBean cb=(CountBean)CountCache.list.getFirst(); 73WSW/^F
CountCache.list.removeFirst(); GN.Oa$
ps.setInt(1, cb.getCountId()); ]6&NIz`:,
ps.executeUpdate();⑴ _`$LdqgE
//ps.addBatch();⑵ /Y Kd [RQ
} @u3`lhUcT
//int [] counts = ps.executeBatch();⑶ Rd?}<L
conn.commit(); N!A20Bv
}catch(Exception e){ rCyb3,W
e.printStackTrace(); ejRK-!
} finally{ HDyf]2N*N
try{ ."K>h3(&V
if(ps!=null) { 0oe<=L]F
ps.clearParameters(); z*Sm5i&)_q
ps.close(); v1h(_NLI!
ps=null; +bjy#=
} $o6/dEKQ
}catch(SQLException e){} -H1=N
DBUtils.closeConnection(conn); 2`yhxO
} We+rFk1ddt
} H/8^Fvd
public long getLast(){ :-&|QVH
return lastExecuteTime; ;#B(L=/
} 4.6$m
public void run(){ !\]^c
long now = System.currentTimeMillis(); urp|@WZ
if ((now - lastExecuteTime) > executeSep) { e r"
w{
//System.out.print("lastExecuteTime:"+lastExecuteTime); ?0b-fL^^+l
//System.out.print(" now:"+now+"\n"); b`0tfXzS5
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Re%[t9F&
lastExecuteTime=now; LvG.ocCG
executeUpdate(); 6|97;@94
} +^I0>\
else{ vwR_2u
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); CjdM*#9lW
} ROO*/OOd
} rK~-Wzwu
} N_t,n^i9>*
//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 :\TMm>%q
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类写好了,下面是在JSP中如下调用。 G1:}{a5i_
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<% %zavSm"
CountBean cb=new CountBean(); -15e
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); OY*y<