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: 31LXzQvFG
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CountBean.java -DrR6kGjR
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/* e%&2tf4
* CountData.java rLNo7i
* ^0R.U+?+
* Created on 2007年1月1日, 下午4:44 wAxXK94#3
* lvIKL!;H
* To change this template, choose Tools | Options and locate the template under |eIN<RY5
* the Source Creation and Management node. Right-click the template and choose k7Fa+Y)K7
* Open. You can then make changes to the template in the Source Editor. ^WP`;e
*/ >[=q9k
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package com.tot.count; yc2c{<Ya5
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/** Z9s tB>?
* U7.3`qd"
* @author !CROc}
*/ [y|"iSD
public class CountBean { DPJ#Y -0
private String countType; 0&Q-y&$7
int countId; L,| 60*
/** Creates a new instance of CountData */ 0b9K/a%sQv
public CountBean() {} Jz
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public void setCountType(String countTypes){ *,~d!Fc
this.countType=countTypes; @.T
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} ozF>2`K
}
public void setCountId(int countIds){ kt.z,<w5O
this.countId=countIds; ./LD
} 8[U1{s:J
public String getCountType(){ 3'6%P_S
return countType; {,tEe'H7
} *SQ hXTn
public int getCountId(){ '5.n28W>
return countId; >S3iP?V7
} ('pNAn!]
} eD/O)X
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CountCache.java ^AK<]r<?L?
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/* `;4P?!WG
* CountCache.java >4`("#
* =4uL1[0'
* Created on 2007年1月1日, 下午5:01 Enn7p9&
* u
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* To change this template, choose Tools | Options and locate the template under 2`I"
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* the Source Creation and Management node. Right-click the template and choose xal+buOiP
* Open. You can then make changes to the template in the Source Editor. eWSA
*/ c1M/:*?%
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package com.tot.count; ik)T>rYg0
import java.util.*; A;n3""
/** ,\q9>cZ!
* "2q}G16K
* @author yjlX@YXnw
*/ TJ8IYo|
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public class CountCache { |uId:^{
public static LinkedList list=new LinkedList(); C-lv=FJEk/
/** Creates a new instance of CountCache */ /"?yB$s
public CountCache() {} ^WQ.' G5Q
public static void add(CountBean cb){ ol7%$:S
if(cb!=null){ >%5Ld`c:SD
list.add(cb); hu0z):>y
} ;X,|I)
} F7lhLly
} S[(Tpk2_
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CountControl.java
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/* G(W/.*
* CountThread.java 6U5L>sQ
* ,Bax0p
* Created on 2007年1月1日, 下午4:57 5'wWj}0!%
* ")m0{
* To change this template, choose Tools | Options and locate the template under K8M[xaI@
* the Source Creation and Management node. Right-click the template and choose 9`
* Open. You can then make changes to the template in the Source Editor. yXP+$oox9
*/ Hc^q_{}"
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package com.tot.count; &{E1w<uv
import tot.db.DBUtils; zLEl/yPE
import java.sql.*; DCr&%)Ll
/** t4(Z@X$
* 6BK-(>c(6
* @author j<|I@0
*/ n4 A_vz
public class CountControl{ 4.Luy
private static long lastExecuteTime=0;//上次更新时间 _wMx KM
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 r Q)?Bhf
/** Creates a new instance of CountThread */ &zkuL
public CountControl() {} 2$ m#)*\
public synchronized void executeUpdate(){ MiHa'90{K
Connection conn=null; C#<b7iMg
PreparedStatement ps=null; "LZQ1P*ef$
try{ A$d)xq-]K
conn = DBUtils.getConnection(); z OwKh>]
conn.setAutoCommit(false); Xc8r[dX
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ;;>hWAS
for(int i=0;i<CountCache.list.size();i++){ ^#-d^ )f;
CountBean cb=(CountBean)CountCache.list.getFirst(); v'3.`aZ!
CountCache.list.removeFirst(); k*XI/k5Vc
ps.setInt(1, cb.getCountId()); 2kukQj(n
ps.executeUpdate();⑴ K9-;-{qb
//ps.addBatch();⑵ (j<FS>##
} 0QJ
:
//int [] counts = ps.executeBatch();⑶ _[%2QwAUj*
conn.commit(); |T`ZK?B+u
}catch(Exception e){ _A]8l52pt
e.printStackTrace(); {"kEu
} finally{ Qc4r?7S<
try{ >-S? rXO
if(ps!=null) { ZVu_E.4.
ps.clearParameters(); >qE f991SZ
ps.close(); BQW hTS7
ps=null; ~l {*XM
} eR1SPS1+
}catch(SQLException e){} 8Dy5g
DBUtils.closeConnection(conn); sF. oZ>
} M[eq)a$
} )NF5,eD
public long getLast(){ I1f4u6\*X
return lastExecuteTime; E5;6ks)
} gm^j8B
public void run(){ {beu
long now = System.currentTimeMillis(); \p4>onGI
if ((now - lastExecuteTime) > executeSep) { -G'U\EXT
//System.out.print("lastExecuteTime:"+lastExecuteTime); Fal##6B
//System.out.print(" now:"+now+"\n");
}H5~@c$
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); g49G7sk
lastExecuteTime=now; ()}(3>O-
executeUpdate(); X&LaAqlSG
} Bm>>-nG;
else{ 6
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); gPE`mE
} Wg5<@=x!G
} jT'09r3P
} /nq\*)S#&
//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 8(zE^W,[8"
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类写好了,下面是在JSP中如下调用。 2RbK##`vC
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<% fzdWM:g
CountBean cb=new CountBean(); F G:t2ea
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ?W 6
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CountCache.add(cb); \; voBU
out.print(CountCache.list.size()+"<br>"); &wa2MNCG8
CountControl c=new CountControl(); B7QRG0
c.run(); %O|+`"
out.print(CountCache.list.size()+"<br>"); FoQy@GnM5
%>