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: >^{yF~(
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CountBean.java F_P~x(X
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/* :[d9tm
* CountData.java b|(:[nB
* ZWm6eD
* Created on 2007年1月1日, 下午4:44 xN'I/@ kb
* a?oI>8*
* To change this template, choose Tools | Options and locate the template under &uVnZ@o42
* the Source Creation and Management node. Right-click the template and choose hXya*#n#
* Open. You can then make changes to the template in the Source Editor. 5#z1bu
*/ w&.aQGR#
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package com.tot.count; AQ^u
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/** #T"4RrR
* :Llb< MY2
* @author 3PF_H$`oJ
*/ V|R,!UND
public class CountBean { (^>J&[=
private String countType; B`sAk
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int countId; ?gXp*>Kg[
/** Creates a new instance of CountData */ a,o*=r
public CountBean() {} ue>D7\8
public void setCountType(String countTypes){ /g.U&oI]D
this.countType=countTypes; .fs3>@T"#
} 7uk[Oy<_
public void setCountId(int countIds){ UC$ppTCc?
this.countId=countIds; "ocyK}l.?
} zKK9r~ M
public String getCountType(){ "9807OME
return countType; D)}v@je"yP
} IAyp 2
public int getCountId(){ >@Kx>cg+
return countId; 5IpDeJ$
} Zb#u0Tq
} ?&uu[y
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CountCache.java !ubD/KE
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/* 2 ? 4!K.
* CountCache.java \}G^\p6?M
* gI`m.EH}}N
* Created on 2007年1月1日, 下午5:01 >.D4co>
* u]G\H!WkQ
* To change this template, choose Tools | Options and locate the template under H%{+QwzZ[j
* the Source Creation and Management node. Right-click the template and choose f)<6
* Open. You can then make changes to the template in the Source Editor. Gp\
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*/ 4{Z)8;QX
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package com.tot.count; (QiAisE
import java.util.*; fTX;.M/%
/** kSo"Ak!
* DIUjn;>k8
* @author o,wUc"CE
*/ 7mfS*aCb
public class CountCache { 'E.w=7z&
public static LinkedList list=new LinkedList(); f<6lf7qzC
/** Creates a new instance of CountCache */ /<BI46B\
public CountCache() {} *n"{J(Jt`
public static void add(CountBean cb){ A_UjC`
if(cb!=null){ o<!?7g{
list.add(cb); 4`=mu}Y2
} |+"(L#wk
} ]{>,rK[So
} {Hk}Kow
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CountControl.java
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/* &Hnz8Or!
* CountThread.java {f p[BF
* uvS)8-o&F
* Created on 2007年1月1日, 下午4:57 E<*xx#p
* wUM0M?_p[
* To change this template, choose Tools | Options and locate the template under ,"0:3+(8;
* the Source Creation and Management node. Right-click the template and choose Q=dy<kg']
* Open. You can then make changes to the template in the Source Editor. _Bj":rzY
*/ 7IM@i>p%
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package com.tot.count; {(?4!rh
import tot.db.DBUtils; pmYHUj
#
import java.sql.*; QSf|nNT
/** +qdEq_m
* 3T0"" !Q
* @author j_7mNIr
*/ t.C5+^+%
public class CountControl{ '/%H3A#L
private static long lastExecuteTime=0;//上次更新时间 {+ b7sA3
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 k~z Iy;AZ
/** Creates a new instance of CountThread */ g#E-pdY
public CountControl() {} pI<f) r
public synchronized void executeUpdate(){ l}M!8:UzU
Connection conn=null; o[D9I
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PreparedStatement ps=null; Srd4))2/0
try{ dUdT7ixo
conn = DBUtils.getConnection(); 5Jnlz@P9
conn.setAutoCommit(false); E&:,oG2M
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Yz)qcU
for(int i=0;i<CountCache.list.size();i++){ J<lO=
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CountBean cb=(CountBean)CountCache.list.getFirst(); oe~b}:
CountCache.list.removeFirst(); f(7GX3?
ps.setInt(1, cb.getCountId()); P0jtp7)7
ps.executeUpdate();⑴ Fv`,3aNB
//ps.addBatch();⑵ sW8dPw
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} iDrZc
//int [] counts = ps.executeBatch();⑶ Q=yg8CQ
conn.commit(); [)X\|pO&
}catch(Exception e){ Z;)%%V%o
e.printStackTrace(); h2J
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} finally{ BING{ew
try{ El"Q'(:/U
if(ps!=null) { LBP`hK:>W~
ps.clearParameters(); ?=pT7M
ps.close(); FHI ;)wn=
ps=null; ENY+^7
} BTrn0
}catch(SQLException e){} ,UE83j8D^
DBUtils.closeConnection(conn); )dd@\n$6
} %D "I
} koi^l`B$
public long getLast(){ ^5
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return lastExecuteTime; x]ot 2
} &b& ,
public void run(){ E8&TO~"a]e
long now = System.currentTimeMillis(); y4fdq7i~}9
if ((now - lastExecuteTime) > executeSep) { 9=2$8JN=(l
//System.out.print("lastExecuteTime:"+lastExecuteTime); b>JDH1)
//System.out.print(" now:"+now+"\n"); qJUK_6|3
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); -z(+/ /K:#
lastExecuteTime=now; K@hw.Xq"
executeUpdate(); S|+o-[e8O
} l1Fc>:o{
else{ jrh43
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); jRV/A!4
} =odFmF
} =w0R$&b&
} *CHX
//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 45>?o
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类写好了,下面是在JSP中如下调用。 6)Lk-D
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<% Q]>.b%s[
CountBean cb=new CountBean(); VP]% Hni]
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); HyWCMK6b
CountCache.add(cb); u;c?d!E
out.print(CountCache.list.size()+"<br>"); J-hbh
CountControl c=new CountControl(); M =r)I~
c.run(); ~qOa\#x_
out.print(CountCache.list.size()+"<br>"); ZJs$STJ*
%>