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: 4 UnN~
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CountBean.java Bc51
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/* b "5WsJ:'#
* CountData.java ,98`tB0
* ZVz`-hB
* Created on 2007年1月1日, 下午4:44 6#1:2ZHKG
* z|i2M8
* To change this template, choose Tools | Options and locate the template under |%5nV=&\
* the Source Creation and Management node. Right-click the template and choose hOIk6}r4X
* Open. You can then make changes to the template in the Source Editor. 1TL~I-G&n
*/ @3I/57u<
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package com.tot.count; =j
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/** gD/% l[
* &Ch~$Wb^
* @author R%^AW2
*/ glP
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public class CountBean { f2RIOL,
private String countType; ajALca4
int countId; S*?x|&a
/** Creates a new instance of CountData */ P(Ve'
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public CountBean() {} n ^_B0Rkv
public void setCountType(String countTypes){ ex-W{k$
this.countType=countTypes;
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} Gu@Znh-D
public void setCountId(int countIds){ }uk]1M2=
this.countId=countIds; xEvm>BZi
} 'K|tgsvgme
public String getCountType(){ h5.AM?*TNd
return countType; "4e{Cq
} WHvU|rJ
public int getCountId(){ 9V( esveq
return countId; qI#ow_lL#
} :T# "bY
} Z@bGLS
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CountCache.java <P4*7:jX
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/* ?^H1X-;
* CountCache.java H{nYZOf/
* Wx-vWWx*Q
* Created on 2007年1月1日, 下午5:01 ;l>C[6]
* .WT^L2l%
* To change this template, choose Tools | Options and locate the template under |8YP8o
* the Source Creation and Management node. Right-click the template and choose =FtJa3mHK
* Open. You can then make changes to the template in the Source Editor. #8[iqvE
*/ rc9Y:(S1l
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package com.tot.count; <UMT:`h1MZ
import java.util.*; nlkQ'XGAI
/** @"E{gM@B
* KGoHn6jM
* @author ,t=12R]>
*/ 81<0B@E
public class CountCache { +|=5zWI/
public static LinkedList list=new LinkedList(); wu2C!gyBo
/** Creates a new instance of CountCache */ 2>bV+[@B
public CountCache() {} -d8||X[
public static void add(CountBean cb){ [M{EO)
if(cb!=null){ 1KtPq,
list.add(cb); U
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} Lv{xwHnE
} \"u3x.!
} ax)j$
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CountControl.java \O7Vo<B&D
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/* njy^<7;
* CountThread.java Iu -CXc
* 1xkU;no
* Created on 2007年1月1日, 下午4:57 2%DleR'i
* [8K+zT5
* To change this template, choose Tools | Options and locate the template under E(&GZ QE
* the Source Creation and Management node. Right-click the template and choose )
-C9W7?I
* Open. You can then make changes to the template in the Source Editor. DB>Y#2j4h
*/ s;0eD5b>x
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package com.tot.count; +H K)A%QI
import tot.db.DBUtils; BI\+NGrB
import java.sql.*; cc%O35o
/** N+vU@)_lC
* $VrKoL\ScA
* @author (&6C,O~n^.
*/ i~IQlyGr.
public class CountControl{ 3PonF4
private static long lastExecuteTime=0;//上次更新时间 !7g
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 IKK<D'6
/** Creates a new instance of CountThread */ a9E!2o+,
public CountControl() {} h]94\XQ>$
public synchronized void executeUpdate(){ :8_`T$8i4
Connection conn=null; )r2$/QF9
PreparedStatement ps=null; bmAgB}Ior
try{ ~?}/L'q!b
conn = DBUtils.getConnection(); X*~NE\
conn.setAutoCommit(false); 6Upg\(
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); I`%=&l[v_5
for(int i=0;i<CountCache.list.size();i++){ ]
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CountBean cb=(CountBean)CountCache.list.getFirst(); xaerMr
CountCache.list.removeFirst(); >:]fN61#
ps.setInt(1, cb.getCountId()); ~zz |U!TG
ps.executeUpdate();⑴ =3=KoH/'
//ps.addBatch();⑵ 5Ag>,>kJ6
} Yf:utCvv
//int [] counts = ps.executeBatch();⑶ e76@-fg
conn.commit(); x
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}catch(Exception e){ EGwY|+3
e.printStackTrace(); $EJ*x$
} finally{ dW7dMx
try{ Hcd> \0
if(ps!=null) { Z"?AaD[
ps.clearParameters(); #|XEBOmsQ
ps.close(); )
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ps=null; p 8"(z@T
} 9L#B"lh
}catch(SQLException e){} f
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DBUtils.closeConnection(conn); /^[)JbgB
} 5 J|;RtcR
} |/fbU_d
public long getLast(){ ,.FTw,<
return lastExecuteTime; 8
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} UxicqkX
public void run(){ xN"KSQpu
long now = System.currentTimeMillis(); eZHzo
if ((now - lastExecuteTime) > executeSep) { Y)u}+Yg
//System.out.print("lastExecuteTime:"+lastExecuteTime); Y0B*.H
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//System.out.print(" now:"+now+"\n"); %yw*!A1
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); lIjHd#q-C
lastExecuteTime=now; }2c}y7B,_
executeUpdate(); l!AZ$IV
} nnGA_7-t
else{ Y(SI`Xo[
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ,t+ATaOF
} ,IJ Nuu\
} 2FVKgyV
} uBE,z>/,;
//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 J#x91Jh
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类写好了,下面是在JSP中如下调用。 ygfqP
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<% E+1j3Q;
CountBean cb=new CountBean(); Ro1' L1:
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); * Yr-:s9J9
CountCache.add(cb); \~)573'
out.print(CountCache.list.size()+"<br>"); 2@&|hd=-
CountControl c=new CountControl(); F>b6fUtR
c.run(); S-/#3
out.print(CountCache.list.size()+"<br>"); P~qVr#eU
%>