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: [ $pmPr2
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CountBean.java %Tv^GP{}
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/* `0{ S3v
* CountData.java U&UKUACn"
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* Created on 2007年1月1日, 下午4:44 /`[!_4i
* LvcuZZ`1a
* To change this template, choose Tools | Options and locate the template under P ZxFZvE
* the Source Creation and Management node. Right-click the template and choose F30
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* Open. You can then make changes to the template in the Source Editor.
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*/ mk!Dozb/
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package com.tot.count; T dk
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/** *FK`&(B+}
* 0w %[
* @author ib$nc2BPb
*/ DVlJ*A
public class CountBean { T-gk <V
private String countType; g JjN<&,
int countId; er2cQS7R
/** Creates a new instance of CountData */ x&Cp> +i
public CountBean() {} pXu/(&?
public void setCountType(String countTypes){ 2#vv$YD
this.countType=countTypes; `pL^}_>|GM
} Zp&@h-%YoD
public void setCountId(int countIds){ Tde0 ~j}
this.countId=countIds; !lTda<;]
} ('C7=u&F
public String getCountType(){ eS'yGY0b
return countType; fKHE;A*>%
} ,lt8O.h-l
public int getCountId(){ t9^A(Vh"-
return countId; uLQ
} 2 rN ,D(
} "B{ECM;
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CountCache.java Wh(
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/* 9MY7a=5E~
* CountCache.java \K
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* \(
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* Created on 2007年1月1日, 下午5:01 [8XLK 4e
* ?kTWpXx"=
* To change this template, choose Tools | Options and locate the template under HN6}R|IH
* the Source Creation and Management node. Right-click the template and choose El-
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* Open. You can then make changes to the template in the Source Editor. >9H@|[C
*/ +9XQ[57
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package com.tot.count; QAPu<rdJP
import java.util.*; g&Vcg`
/** `.%JjsD<
* !ABiy6d
* @author eq[Et
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*/ &QNY,Pj
public class CountCache { O(z}H}Fv
public static LinkedList list=new LinkedList(); cXnKCzSxZq
/** Creates a new instance of CountCache */ -|S]oJy
public CountCache() {} G8Z 4J7^
public static void add(CountBean cb){ i3VW1~ .8
if(cb!=null){ Km#pX1]>e
list.add(cb); *\uM.m0$
} _[K"gu
} DgHaOAdU
} 3;[DJ5
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CountControl.java MZ>6o5K|
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/* /9pM>Cd*Z
* CountThread.java IA&L]
* S4^N^lQ]
* Created on 2007年1月1日, 下午4:57 j*v40mXl`2
* ZR0r>@M3v<
* To change this template, choose Tools | Options and locate the template under Iu@y(wyg
* the Source Creation and Management node. Right-click the template and choose -r7]S
* Open. You can then make changes to the template in the Source Editor. bzN-*3YE=
*/ w|[RDaA b
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package com.tot.count; E
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import tot.db.DBUtils; 6K`c/)
import java.sql.*; )D&M2CUw"f
/** 8~lIe:F-
* ~ PWSo%W8
* @author U69u'G:
*/ fBn"kr;
public class CountControl{ 4Y> Yi*n
private static long lastExecuteTime=0;//上次更新时间 d[ >`")2)
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 g*UMG>
/** Creates a new instance of CountThread */ ;<
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public CountControl() {} Yap?^&GV
public synchronized void executeUpdate(){ }@1q@xU
Connection conn=null; I){\0vb@
PreparedStatement ps=null; A-
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try{ JA)?p{j
conn = DBUtils.getConnection(); tR0pH8?e"
conn.setAutoCommit(false); z4#(Ze@u~_
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ?~"bR%
for(int i=0;i<CountCache.list.size();i++){ GNf 482
CountBean cb=(CountBean)CountCache.list.getFirst(); fWc|gq
CountCache.list.removeFirst(); _@mRb^
ps.setInt(1, cb.getCountId()); l>gI&1)%
ps.executeUpdate();⑴ xT&(n/
//ps.addBatch();⑵ h^9"i3H
} 6VP`evan
//int [] counts = ps.executeBatch();⑶ %@a8P
conn.commit(); K;hh&sTB
}catch(Exception e){ 1=sXdcy;
e.printStackTrace(); ?3ig)J,e[
} finally{ w]b,7QuNz
try{ '^BV_ QQ
if(ps!=null) { '>$EOg"
ps.clearParameters(); X,aYK;q%z
ps.close(); \0l>q ,
ps=null; U[L9*=P;
} SzwQOs*
}catch(SQLException e){} do*}syQ`O
DBUtils.closeConnection(conn); I:bD~Fb3
} vu!d)Fy
} n79QJl/
public long getLast(){ ;8WZx
return lastExecuteTime; T{qTj6I
} H1GRMDNXOA
public void run(){ Jj~EiA
long now = System.currentTimeMillis(); T9)nQ[
if ((now - lastExecuteTime) > executeSep) { &cWjEx
//System.out.print("lastExecuteTime:"+lastExecuteTime); O%g$9-?F0
//System.out.print(" now:"+now+"\n"); 1g##sSa6
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); b`yZ|j'ikd
lastExecuteTime=now; SK1!thQy
executeUpdate(); DFhXx6]
} e^4 p%
else{ sDr/k`>
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =S '%`] f?
}
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} 6qN~/TnHZ
} S po?i.#
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 ~ ~uAc_
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类写好了,下面是在JSP中如下调用。 2!&&|Mh}
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<% ^ -FX
CountBean cb=new CountBean(); yR{x}DbG
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 7 n]65].t
CountCache.add(cb); Uv
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out.print(CountCache.list.size()+"<br>"); 7Dnp'*H
CountControl c=new CountControl(); l`kWz5[~
c.run(); 5aad$f
out.print(CountCache.list.size()+"<br>"); .=m,hu~
%>