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: rxArTpS{.#
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CountBean.java aLHrl6"
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/* |} 9GHjG
* CountData.java VHj*aBHB
* -rRz@Cr
* Created on 2007年1月1日, 下午4:44 +ruj
* Ss+F9J
* To change this template, choose Tools | Options and locate the template under LiF.w:}
* the Source Creation and Management node. Right-click the template and choose ^W k0*.wg
* Open. You can then make changes to the template in the Source Editor. >!<V\
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*/ 0pCDEs
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package com.tot.count; ,`+Bs&S 8
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/** xNx`J@xt$
* ^[*AK_o_DQ
* @author W -3w7^
*/ o=@ UXi
public class CountBean { {YfYIt=.
private String countType; DSTx#*
int countId;
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/** Creates a new instance of CountData */ 5%#i79z&B
public CountBean() {} +
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public void setCountType(String countTypes){ @}Pw0vC
this.countType=countTypes; i'9eKO
} 7~L|;^(
public void setCountId(int countIds){ m9uUDq#GJ
this.countId=countIds; tPA"lBS !
} oX2r?.j#M
public String getCountType(){ )y5iH){!
return countType; gMCy$+?
} 2pw>B%1WP)
public int getCountId(){ jw/wcP
return countId; J511AoQ{R
} x[Hhj'
} ;Xz(B4 N~o
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CountCache.java @RQ+JYQi
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/* &(GopWR`e
* CountCache.java 8 `yB
* +)% ,G@-`
* Created on 2007年1月1日, 下午5:01 n2H&t>N
* +~@7"
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* To change this template, choose Tools | Options and locate the template under 5BZ+b_A>VV
* the Source Creation and Management node. Right-click the template and choose EwC5[bRjUp
* Open. You can then make changes to the template in the Source Editor. yFIl^Ck%
*/ JHHb |
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package com.tot.count; n&3iz05}
import java.util.*; e3G7K8
/** .`b4h"g:
* q=J9LQ
* @author T %$2k>
*/ @^BS#
public class CountCache { 2J1B$.3'
public static LinkedList list=new LinkedList(); 5^bh.uF
/** Creates a new instance of CountCache */ 3KB|NS
public CountCache() {} 4,o
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public static void add(CountBean cb){ `e4o 1*
if(cb!=null){ !>?4[|?n<
list.add(cb); JvT%R`i
} @263)`9G
} !^n1
} "K/[[wX\b
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CountControl.java X^u4%O['
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/* GP0[Y
* CountThread.java <.y;&a o
* # w
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* Created on 2007年1月1日, 下午4:57 .dy#n`eP
* (K!M*d+
* To change this template, choose Tools | Options and locate the template under 2(@LRl>:
* the Source Creation and Management node. Right-click the template and choose nYmf(DV
* Open. You can then make changes to the template in the Source Editor. mrw]yu;2<n
*/ &Xj {:s#
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package com.tot.count;
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import tot.db.DBUtils; W*1d
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import java.sql.*; ee4KMS
/** nNkyOaK*4
* @'6S[zU
* @author b\<lNE!L
*/ y 8Ei=[
public class CountControl{ [1t\|v
private static long lastExecuteTime=0;//上次更新时间 //ne']L
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 !3O,DhH>MC
/** Creates a new instance of CountThread */ /F\>Z]
public CountControl() {} *##QXyyg
public synchronized void executeUpdate(){ *C[4 (DmB
Connection conn=null; k^L#,:\&V
PreparedStatement ps=null; m~A[V,os
try{ EOMuqP)
conn = DBUtils.getConnection(); =vB]*?;9
conn.setAutoCommit(false); 3tJ=d'U
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); !y[}|
for(int i=0;i<CountCache.list.size();i++){ z(8)1#(n7
CountBean cb=(CountBean)CountCache.list.getFirst(); h0'8NvalQ
CountCache.list.removeFirst(); FY_avW
ps.setInt(1, cb.getCountId()); [ flu|v
ps.executeUpdate();⑴ ^TuP=q5?
//ps.addBatch();⑵ G~b`O20N
} bW,BhUb,|
//int [] counts = ps.executeBatch();⑶ E#IiyZ
conn.commit(); N>W;0u!
}catch(Exception e){ 7C,<iY
e.printStackTrace(); ~z-?rW
} finally{ v
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try{ __oY:d(~
if(ps!=null) { -N /8Ho
ps.clearParameters(); }.fZy&_
ps.close(); "t3uW6&
ps=null; N2+mN0k;
} D;16}D
}catch(SQLException e){} p 02nd.R6
DBUtils.closeConnection(conn); f}evw K[S
} UBUB/NY
} ^VM"!O;h{
public long getLast(){ W>aQ
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return lastExecuteTime; :8\*)"^E
} 1[fkXO{
public void run(){ -+j9X;h:
long now = System.currentTimeMillis(); KNO*)\
if ((now - lastExecuteTime) > executeSep) { op.PS{_t
//System.out.print("lastExecuteTime:"+lastExecuteTime); sK""
//System.out.print(" now:"+now+"\n"); K#m\qitb
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); iMOPD}`IX
lastExecuteTime=now; T2/v}
executeUpdate(); 46Y7HTwE
} XC+F! R
else{ {y+v-v/#
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); )zk?yY6
} 2yi*eR
} B J:E,P`_
} 2ZTyo7P
//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 #Of<1
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类写好了,下面是在JSP中如下调用。 x`j$9XN5
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<% b7>-aem@I
CountBean cb=new CountBean(); HzgQI
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); YKs^%GO+
CountCache.add(cb); \pBYWf
out.print(CountCache.list.size()+"<br>"); @@&@}IQcR1
CountControl c=new CountControl(); /jK17}j
c.run(); it/C y\f
out.print(CountCache.list.size()+"<br>"); ]XpU'/h>q;
%>