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: Y7[jqb1D
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CountBean.java l?^4!&Nm
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/* }Ys>(w
* CountData.java AZ}Xj>=
* '!a'ZjYyi
* Created on 2007年1月1日, 下午4:44 d$AWu{y
* 5-xX8-ElYz
* To change this template, choose Tools | Options and locate the template under E1U",CMU
* the Source Creation and Management node. Right-click the template and choose Ezv
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* Open. You can then make changes to the template in the Source Editor. Gm.]sE?.
*/ Q&|\r
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package com.tot.count; H1(Uw:V8
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/** LAe6`foW/
* 4 vV:EF-
* @author v2;`f+
*/ ,T8 ~L#M~
public class CountBean { nmi|\mof
private String countType; e,XYVWY%
int countId; w~?~g<q
/** Creates a new instance of CountData */ xLZG:^(I
public CountBean() {} a"g!e^
public void setCountType(String countTypes){ E'.7xDN
this.countType=countTypes; ^_5r<{7/ :
} f &wb
public void setCountId(int countIds){ "{Eta
this.countId=countIds; \<6CZ
} usL*
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public String getCountType(){ ,tJ"
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return countType; 'D"C4;X
} =+MPFhvg!
public int getCountId(){ -n<pPau2
return countId; Y~E`9
} 3%;a)c;D
} ([LSsZ]sj
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CountCache.java ["e3Ez
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/* o"BoZsMk
* CountCache.java WYYa/,{9.
* )$bS}.
* Created on 2007年1月1日, 下午5:01 do+.aOC
* @)&=%
* To change this template, choose Tools | Options and locate the template under n%s]30Xs
* the Source Creation and Management node. Right-click the template and choose "?I y (*^
* Open. You can then make changes to the template in the Source Editor.
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*/ x&T [*i
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package com.tot.count; N;j)k;
import java.util.*; "s_lP&nq
/** -JjM y X
* `&sH-d4v
* @author E5lBdM>2
*/ /U)D5ot<
public class CountCache { *m,k(/>
public static LinkedList list=new LinkedList(); Nf"r4%M<6
/** Creates a new instance of CountCache */ oVe|Mss6
public CountCache() {} Zt.|oYH$
public static void add(CountBean cb){ /&+tf*
if(cb!=null){ ;^I*J:]
list.add(cb); $.rhRKs
} RnI&8
} J@Q7p}
} /j|G(vt5
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CountControl.java Nyj( 0W
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/* !XCm>]R
* CountThread.java krvp&+uX
* I \[_9
* Created on 2007年1月1日, 下午4:57 |! E)GahM
* }YNR"X9*)/
* To change this template, choose Tools | Options and locate the template under NI
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* the Source Creation and Management node. Right-click the template and choose hPePB=
* Open. You can then make changes to the template in the Source Editor. 364`IC( a
*/ :Ab%g-
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package com.tot.count; )MchsuF<
import tot.db.DBUtils; }n2M G
import java.sql.*; ],a 5)kV
/** TS9|a{j3!
* Yqi4&~?db
* @author &3Szje
*/ nd1+"-,q
public class CountControl{ #& Rw&
private static long lastExecuteTime=0;//上次更新时间 1\>^m
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Ix=}+K/
/** Creates a new instance of CountThread */ Vq?p|wy
public CountControl() {} ,+xB$e
public synchronized void executeUpdate(){ >X4u]>X
Connection conn=null; F!Q@u
PreparedStatement ps=null; jQ
try{ &Ao+X=qw
conn = DBUtils.getConnection(); ?ztkE62t
conn.setAutoCommit(false); dCk3;XU
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); \2"I;
for(int i=0;i<CountCache.list.size();i++){ JYd 'Jp8bP
CountBean cb=(CountBean)CountCache.list.getFirst(); 6ne7]RY
CountCache.list.removeFirst(); X_|J@5b7
ps.setInt(1, cb.getCountId()); +M$Q
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ps.executeUpdate();⑴ ;n=.>s*XL'
//ps.addBatch();⑵ 71gT.E
} E!l!OtFL
//int [] counts = ps.executeBatch();⑶ ^o1*a&~J@
conn.commit(); `_RTw5{
}catch(Exception e){ -w_QJ_z_
e.printStackTrace(); Xudg2t)+K
} finally{ DYxCQ
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try{ [@b&? b~K
if(ps!=null) { iIa'2+
ps.clearParameters(); ve/<=IR
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ps.close(); u TK,&
ps=null; k+C zj
} ,\ k(x>oy
}catch(SQLException e){} 4.=3M
DBUtils.closeConnection(conn); cy3B({PLy
} cKim-
} K3;nY}\>
public long getLast(){ sOJQ,"sB
return lastExecuteTime; !&/{E
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} *HO}~A%Lx
public void run(){ CcFn.omA
long now = System.currentTimeMillis(); 3.W@ }
if ((now - lastExecuteTime) > executeSep) { 3#&7-o
//System.out.print("lastExecuteTime:"+lastExecuteTime); |>htvDL
//System.out.print(" now:"+now+"\n"); LBsluT
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); >>o dZL
lastExecuteTime=now; (Cd\G=PK
executeUpdate(); J/GSceHF
} $[&*Bj11Yg
else{ G<f@#[$'
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); af+IP_6
.
} 80/F7 q'tn
} .#Z%1U%P.
} #9xd[A: N
//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 m{uxIza
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类写好了,下面是在JSP中如下调用。 % !>I*H
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<% aL%AQB,
CountBean cb=new CountBean(); muZ~*kMc
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 9Hu/u=vB<
CountCache.add(cb); JSW}*HR
out.print(CountCache.list.size()+"<br>"); X+}1
CountControl c=new CountControl(); "4H
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c.run(); ^Z#W_R\l
out.print(CountCache.list.size()+"<br>"); V<@ o<R
%>