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: ]JQ';%dne
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CountBean.java n9.` 5BH7/
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/* 5r;M61
* CountData.java [nQ<pTg~r
* oLJP@J
* Created on 2007年1月1日, 下午4:44 y'ZRoakz)
* ;t'~
* To change this template, choose Tools | Options and locate the template under eGZ{%\PH<
* the Source Creation and Management node. Right-click the template and choose o.qeF4\d6
* Open. You can then make changes to the template in the Source Editor. O gQE1{C
*/ ?NV3]vl
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package com.tot.count; JTH8vk:@
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/** q&.SB`
* yqdhLX|Mk
* @author D8u_Z<6IjI
*/ &|t*9D
public class CountBean { ?n$;l-m[
private String countType; m791w8Vr
int countId; yFp8 >
/** Creates a new instance of CountData */ _7?LINF9
public CountBean() {} B(<;]
public void setCountType(String countTypes){ DL&\iR
this.countType=countTypes; FKU$HQw*
} /IDfGAE
public void setCountId(int countIds){ l1X&Nw1W
this.countId=countIds; ZqaCe>
} ({/@=e x*
public String getCountType(){ :OC`X~}Rc
return countType; O=wA/T=w?
} R:7j`gHJ|9
public int getCountId(){ !oTF2Q+C
return countId; ") Xy%C`J
} $<jI<vD+:
} _KSYt32N
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CountCache.java fL[(;KcAa
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/* K*Tj;
* CountCache.java 2"
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* &M$s@FUY
* Created on 2007年1月1日, 下午5:01 PqMU&H_
* $E;`Y|r%WK
* To change this template, choose Tools | Options and locate the template under Xz`?b4i
* the Source Creation and Management node. Right-click the template and choose SWujj,-[
* Open. You can then make changes to the template in the Source Editor. _1w?nN'
*/ Z_&6<1,H
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package com.tot.count; #8.%YG
import java.util.*; k8E'wN
/** ]m0MbA
* eup#.#J
* @author 0w?\KHT
*/ ;Wjb}_V:_
public class CountCache { !2oe;q2X[G
public static LinkedList list=new LinkedList(); OA#AiQUR
/** Creates a new instance of CountCache */ 7[)4k7
public CountCache() {} @C40H/dE
public static void add(CountBean cb){ D.G+*h@ g
if(cb!=null){ MrIo.
list.add(cb); AtNu:U$
} &E.ckWf
} Cg NfqT0
} i>gbT+*E!
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CountControl.java mVGQyX
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/* h@$M.h@mcG
* CountThread.java V6'"J
* wkm;yCF+
* Created on 2007年1月1日, 下午4:57 yP\KIm!
* o@[yF<
* To change this template, choose Tools | Options and locate the template under aNgaV$|2a
* the Source Creation and Management node. Right-click the template and choose $<c0Z6f
* Open. You can then make changes to the template in the Source Editor. pv%UsbY
*/ :AYp{"{
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package com.tot.count; DZGM4|@<7Y
import tot.db.DBUtils; ES72yh]
import java.sql.*; mXnl-_
/** (C/2shr 8
* dwOB)B@{H
* @author [>xwwm
*/ qn}w]yGW
public class CountControl{ CSx V^
private static long lastExecuteTime=0;//上次更新时间 YUdCrb9F
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +Ze HZjd
/** Creates a new instance of CountThread */ "\bbe @
public CountControl() {} bY:A7.p7#
public synchronized void executeUpdate(){ ]c,ttS_
Connection conn=null; \O
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PreparedStatement ps=null; 6?nAO
try{ zg,?aAm
conn = DBUtils.getConnection(); dXgj
conn.setAutoCommit(false); f Co- ony
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); gZ6]\l]J{
for(int i=0;i<CountCache.list.size();i++){ _y{z%-
CountBean cb=(CountBean)CountCache.list.getFirst(); >$h *1/
CountCache.list.removeFirst(); VA*~RS
ps.setInt(1, cb.getCountId()); .-t#wXEi
ps.executeUpdate();⑴ k4iu`m@^H
//ps.addBatch();⑵ y\&GPr
} MJS4^*B\1
//int [] counts = ps.executeBatch();⑶ Gqvnc8V&
conn.commit(); [*ylC,w
}catch(Exception e){ !\wdX7%
e.printStackTrace(); *x3";%o
} finally{ cwiHHf>
try{ kylR)
if(ps!=null) { '6Dt@^-PZ
ps.clearParameters(); ZGrjb22M
ps.close(); ,Oojh;P_
ps=null; `pS<v.L3
} MJsz
}catch(SQLException e){} Nx>WOb98
DBUtils.closeConnection(conn); 'vKB]/e;
} '
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} @cNBY7=
public long getLast(){ 2*:lFvwP
return lastExecuteTime; wWs<{ T
} V XEA.Mko
public void run(){ VP^Yph 8R
long now = System.currentTimeMillis(); ~7aBli=
if ((now - lastExecuteTime) > executeSep) { W!B4~L
//System.out.print("lastExecuteTime:"+lastExecuteTime); .U|e#t
//System.out.print(" now:"+now+"\n"); [wB-e~
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Wlm%W>%
lastExecuteTime=now; _%#Q
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executeUpdate(); UBoN}iR
} x 9}D2Ui
else{ t/z]KdK P
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); x
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} 0&$+ CWSM
} -N`j` zb|
} ]eA<
//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 weCRhA
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类写好了,下面是在JSP中如下调用。 2Wz/s 0`
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<% 3vTX2e.w
CountBean cb=new CountBean(); e;8>/G
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \z!*)v/{-
CountCache.add(cb); envu}4wU=e
out.print(CountCache.list.size()+"<br>"); ]|g{{PWH
CountControl c=new CountControl(); pnin;;D*
c.run(); SrzlR)
out.print(CountCache.list.size()+"<br>"); zRtaO'G(
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