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: >CH
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CountBean.java k]t,q$Vd
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/* ^)Smv\Md
* CountData.java 1>hb-OMX
* hH#lTye
* Created on 2007年1月1日, 下午4:44 pa>p%
* axOi5
* To change this template, choose Tools | Options and locate the template under $y8mK|3.3u
* the Source Creation and Management node. Right-click the template and choose &ycjSBK
* Open. You can then make changes to the template in the Source Editor. 0T(O'v}.
*/ E1#H{)G
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package com.tot.count; N`f!D>b:dn
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/** dJloH)uJZ>
* 04P.p6
* @author $|rCrak;
*/ ={\![{L
public class CountBean { DE5d]3B
private String countType; z'?SRK5+
int countId; kea e.6[
/** Creates a new instance of CountData */ ?Y%}(3y
public CountBean() {} w8G7Jy
public void setCountType(String countTypes){ "v@);\-V
this.countType=countTypes; @8QFP3\1
} R_t~UTfI;
public void setCountId(int countIds){ "tfn?n0
this.countId=countIds; yVT&rQ"{
} Um/CR!
public String getCountType(){ 2TE\4j
return countType; +8]W\<Kp
} }*0,>w>
public int getCountId(){ x6"/z
return countId; ur?d6a
} n; Lo
} ThjUiuWe
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CountCache.java zB;'_[8M
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/* Tnf&pu#5
* CountCache.java th5
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* C_6GOpl
* Created on 2007年1月1日, 下午5:01 cR,'o'V/
* $Vo/CZW7
* To change this template, choose Tools | Options and locate the template under 8FAT(f//.
* the Source Creation and Management node. Right-click the template and choose $$k7_rs
* Open. You can then make changes to the template in the Source Editor. r5D jCV"
*/ <9=zP/Q
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package com.tot.count; n>u.3wL
import java.util.*; wYZy e^7
/** .UNF~}^H
* W,xi>5k
* @author
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*/ xt?3_?1
public class CountCache { -kWO2
public static LinkedList list=new LinkedList(); ue,#,3{m
/** Creates a new instance of CountCache */ -L+\y\F
public CountCache() {} rd XCWK$E
public static void add(CountBean cb){ n;e."^5
if(cb!=null){ ;7;zhJs1t
list.add(cb); ?lu_}t]
} ,lrYl!,
} x eJ9H~^
} !x`;>0
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CountControl.java );0<Odw%.
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/* elN{7:
* CountThread.java 9yh9HE
* N7d17c.
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* Created on 2007年1月1日, 下午4:57 pw0Px
* r~8D\_=s
* To change this template, choose Tools | Options and locate the template under q>Q:X3
* the Source Creation and Management node. Right-click the template and choose k\sc }z8X
* Open. You can then make changes to the template in the Source Editor. qFV;n6&V
*/ Ly#h|)
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package com.tot.count; \;nD)<)J
import tot.db.DBUtils; 6H(fk1E
import java.sql.*; G>
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/** CnxK+1n l
* 3$GY,B
* @author _<u8%\
*/ vpZu.#5c
public class CountControl{ 1"8Z
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private static long lastExecuteTime=0;//上次更新时间 `4q5CJ2
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 43vGgGW
/** Creates a new instance of CountThread */ \4[c}l
public CountControl() {} )B-MPuB
public synchronized void executeUpdate(){ v p"%IW
Connection conn=null; KC@k9e
PreparedStatement ps=null; Fpy6"Z?z
try{ ^n\9AE3
conn = DBUtils.getConnection(); AZh@t?)
conn.setAutoCommit(false); utYnaeQcn
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); P5'iYahCq_
for(int i=0;i<CountCache.list.size();i++){ XkM s
CountBean cb=(CountBean)CountCache.list.getFirst(); i_j9/k
CountCache.list.removeFirst(); b:N^Fe
ps.setInt(1, cb.getCountId()); Ha46U6_'h
ps.executeUpdate();⑴ J!21`M-Ue
//ps.addBatch();⑵ i /O1vU#
} [W^6u7~
//int [] counts = ps.executeBatch();⑶ o0,UXBx
conn.commit(); C><<0VhU
}catch(Exception e){ *(?U
e.printStackTrace(); :z0s*,QH
} finally{ LydbP17K}
try{ ek<PISlci
if(ps!=null) { hQgk.$g
ps.clearParameters(); FRl3\ZDqrb
ps.close(); 'hwV
ps=null; U%mkhWn
} *u|lmALs
}catch(SQLException e){} >P6^k!R1y
DBUtils.closeConnection(conn); /'8*aUa
} Sqp;/&Ji
} Q3<bC6$r
public long getLast(){ ,!o\),N
return lastExecuteTime; XM$5S+e
} m#5|J@]
public void run(){ sDLVYD
long now = System.currentTimeMillis(); Hmz=/.$
if ((now - lastExecuteTime) > executeSep) { 9;E%U2T7
//System.out.print("lastExecuteTime:"+lastExecuteTime); 5}.,"Fbr
//System.out.print(" now:"+now+"\n"); @A~B
,
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); W~XV
lastExecuteTime=now; 4kW30Ma
executeUpdate(); yj}bY?4I
} 8ktjDs$=.:
else{ A}>|tm7|
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); )64LKb$
} HGP%a1RF#
} R9b/?*%=9
} !$:0E
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//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 M iP[UCh
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类写好了,下面是在JSP中如下调用。 "_ PH "W
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<% C:'WX*W
CountBean cb=new CountBean(); JfZL?D{NM
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); C ?GvTc
CountCache.add(cb); LG/=+[\{E
out.print(CountCache.list.size()+"<br>"); )0Y #-=.<
CountControl c=new CountControl(); TIK/ %T
c.run(); A%NK0j$;}
out.print(CountCache.list.size()+"<br>"); 1M%{Uqsd -
%>