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: :CLWmMC_
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CountBean.java Qp7h|<
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/* ?8N^jjG
* CountData.java SSxp!E'
* ,.Lwtp,n
* Created on 2007年1月1日, 下午4:44 ;.'?(iEB
* ulE5lG0c
* To change this template, choose Tools | Options and locate the template under LAkBf
* the Source Creation and Management node. Right-click the template and choose PriLV4?
* Open. You can then make changes to the template in the Source Editor. @Bds0t
*/ {7jl) x3l
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package com.tot.count; !0dQfj^_
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/** p4V* %A&w
* EQN)y27poW
* @author tk]D)+{u&c
*/ i\<S ;
public class CountBean { k4a51[SYBK
private String countType; _3(rwD
int countId; !wN2BCSY@
/** Creates a new instance of CountData */ 3\2%i6W6
public CountBean() {} )r^vrCNy>
public void setCountType(String countTypes){ BmKf%:l}
this.countType=countTypes; P -NR]f
} VCfHm"'E8
public void setCountId(int countIds){ -0UR%R7q
this.countId=countIds; .fbY2b([
} ?5FlbiT
public String getCountType(){ !B 4z U:d
return countType; F ei5'
} !KMl'kswe:
public int getCountId(){ 6R,Y.srR
return countId; ( +Sv3h
} KCO.8=y3
} D(l,Z
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CountCache.java A|GtF3:G
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/* VwpC UW
* CountCache.java n&Ckfo_D
* f`:GjA,J$
* Created on 2007年1月1日, 下午5:01 - w*fS,O
* PChe w3
* To change this template, choose Tools | Options and locate the template under C7ug\_,s
* the Source Creation and Management node. Right-click the template and choose $2\8Rn6'
* Open. You can then make changes to the template in the Source Editor. ~5'7u-;
*/ s3eS` rK-
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package com.tot.count; Lo3N)~5
import java.util.*; /cb`%"Z
/** JcUU#>
* }/dk2!?ig
* @author }[Z'Sg]s
*/ g3].STz6w
public class CountCache { OKAU*}_
public static LinkedList list=new LinkedList(); 9j|v
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/** Creates a new instance of CountCache */ +@=V}IO
public CountCache() {} yAfwQ$Ll7
public static void add(CountBean cb){ q[_qZ
if(cb!=null){ r[4n2Mys
list.add(cb); ~4khIz
} kN.;;HFq#
} jB(+9?;1${
} A+="0{P
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CountControl.java 9Q=VRH:
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/*
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* CountThread.java #m,H1YH
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* `0\Z*^>
* Created on 2007年1月1日, 下午4:57 PFuhvw~?
* nm@h5ON_
* To change this template, choose Tools | Options and locate the template under z3y{0<3
* the Source Creation and Management node. Right-click the template and choose AY{KxCrb^
* Open. You can then make changes to the template in the Source Editor. *mzi ?3
*/ <a]i"s
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package com.tot.count; i}VF$XN
import tot.db.DBUtils; SK
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import java.sql.*; _8a;5hS
/** qS#G7~ur>y
* Hl,{4%]
* @author >=[uLY[aK
*/ eJ99 W=
public class CountControl{ Up{[baWF
private static long lastExecuteTime=0;//上次更新时间 :D*U4<
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 =..Bh8P71!
/** Creates a new instance of CountThread */ aOH|[
public CountControl() {} ^K;k4oK
public synchronized void executeUpdate(){ EY )2,
Connection conn=null; ZU73UL
PreparedStatement ps=null; g%&E~V/g$
try{ >E>yA d
conn = DBUtils.getConnection(); HEBeJ2w
conn.setAutoCommit(false); q7X#LY k
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); @khFk.LBD
for(int i=0;i<CountCache.list.size();i++){ x"{aO6M
CountBean cb=(CountBean)CountCache.list.getFirst(); SI=$s>1
CountCache.list.removeFirst(); =0pt-FQ
ps.setInt(1, cb.getCountId()); h+}BtKA
ps.executeUpdate();⑴ /~Y\KOH|
//ps.addBatch();⑵ r,Uk)xa/^
} O;H6`JQ
//int [] counts = ps.executeBatch();⑶ j{%;n40$
conn.commit(); %rylmioW>
}catch(Exception e){ ]xQv\u
e.printStackTrace(); _ocCt XI9
} finally{ 23wztEp{a
try{ qD{1X25O
if(ps!=null) { 5tYo! f
ps.clearParameters(); (-gomn
ps.close(); _#u\ar)
ps=null; f' ?/P~[
} D5,]E`jwu
}catch(SQLException e){} oZa'cZNs
DBUtils.closeConnection(conn); J,F1Xmr4
} p?i.<Z
} fOV_ >]u
public long getLast(){ lI<jYd
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return lastExecuteTime; =]%JTGdp(
} X:oOp=y]|
public void run(){ W:_-I4q~
long now = System.currentTimeMillis(); ISGw}# }]?
if ((now - lastExecuteTime) > executeSep) { J!2Z9<q5
//System.out.print("lastExecuteTime:"+lastExecuteTime); 9MMCWMV
//System.out.print(" now:"+now+"\n"); Y;/@[AwF
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); aUaeK(x:H
lastExecuteTime=now; 6kYluV+j
executeUpdate(); X`.##S KC
} {y9G
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else{ z&6_}{2,]
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 4!IuTPmr
} nGH6D2!F
} N&HI)X2&
} >v]^nJl
//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 iH8we,s'
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类写好了,下面是在JSP中如下调用。 B*Tn@t W
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<% Fw 0m(7
CountBean cb=new CountBean(); 5(+9a
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Xs~'M/>
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CountCache.add(cb); GbSCk}>
out.print(CountCache.list.size()+"<br>"); P8eCaZg?(3
CountControl c=new CountControl(); C[L 5H
c.run(); NoiB98g
out.print(CountCache.list.size()+"<br>"); EhxpMTS
%>