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: )
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CountBean.java wKGogf[(%
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/* RZW$!tyI=
* CountData.java %3rTQ:X
* Xthtw *
* Created on 2007年1月1日, 下午4:44 {x7=;-
* qw5&Y$((
* To change this template, choose Tools | Options and locate the template under %
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* the Source Creation and Management node. Right-click the template and choose ^Wif!u/HM
* Open. You can then make changes to the template in the Source Editor. VccM=w%*
*/ OI*ZVD)J
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package com.tot.count; Jc`Rs"2
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/** A%h~Z
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* ]7v81G5E
* @author sZ]'DH&_(
*/ _2]O^$L
public class CountBean { HOq4i!
private String countType; 5/tj
int countId; 7AI3|Ts]p
/** Creates a new instance of CountData */ J `YnT
public CountBean() {} @+iC/
public void setCountType(String countTypes){ 4 #aqz9k
this.countType=countTypes; #fwzFS \XL
} Ica3
public void setCountId(int countIds){ mm_^gQ,`
this.countId=countIds; xIM8
} kxygf9I!;
public String getCountType(){ qx Wgt(Os
return countType; IY V-*/
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} $4DFgvy$
public int getCountId(){ Vu_&~z7h
return countId; kmmL>fCV"M
} L^3~gM"!
} 3b+7^0frY#
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CountCache.java 8oa)qaG1
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/* tB
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* CountCache.java 5LO4P>fq
* O|?Z~
* Created on 2007年1月1日, 下午5:01 ?E%U|(S)=L
* 3aEt>x
* To change this template, choose Tools | Options and locate the template under sk~ za
* the Source Creation and Management node. Right-click the template and choose ylkpYd
* Open. You can then make changes to the template in the Source Editor. y>@v>S
*/ Ok*VQKyDLH
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package com.tot.count; MhHr*!N"}
import java.util.*; 4,j4E@?pG9
/** v$[ @]`
* ooomi"u
* @author
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*/ |VTWw<{LX
public class CountCache { V/`#B$6
public static LinkedList list=new LinkedList(); ^Vl^,@
/** Creates a new instance of CountCache */ `x2fp6
public CountCache() {} W8Ke1(ws&
public static void add(CountBean cb){ ^?E^']H)5u
if(cb!=null){ '&RZ3@}+
list.add(cb); `kqT{fs
} d|>9rX+f
} RcY6V_Qx
} se~ *<5
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CountControl.java W3Fy mCI
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/*
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* CountThread.java 'Y hA
* GA'*58
* Created on 2007年1月1日, 下午4:57 h |s*i
* R'vdk<
* To change this template, choose Tools | Options and locate the template under 3js)niT9u
* the Source Creation and Management node. Right-click the template and choose u86J.K1Q
* Open. You can then make changes to the template in the Source Editor. Sja"(sJ
*/ U,oD44
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package com.tot.count; +<'uw
import tot.db.DBUtils; NFdJb\
import java.sql.*; w;lx:j!Vp$
/** O4lxeiRgC
* {KW&wsI
* @author 6$W -?
*/ :`{9x%o;
public class CountControl{ *raIV]W3
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 =@bXGMsV!
/** Creates a new instance of CountThread */ ;e&hM\p
public CountControl() {} Q'FX:[@x-S
public synchronized void executeUpdate(){ DH}s1mNMP
Connection conn=null; F@>w&A~K
PreparedStatement ps=null; =_#ye}E
try{ OwNA N
conn = DBUtils.getConnection(); #gxRTx
conn.setAutoCommit(false); )v*v
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); +9<,3IJe6
for(int i=0;i<CountCache.list.size();i++){ 0-8ELX[#
CountBean cb=(CountBean)CountCache.list.getFirst(); ~*66 3pA
CountCache.list.removeFirst(); `l
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ps.setInt(1, cb.getCountId()); @)aXNQY
ps.executeUpdate();⑴ (Q}PeKM?jq
//ps.addBatch();⑵ >xxXPvM<`
} 0!3!?E <
//int [] counts = ps.executeBatch();⑶ yC9:sQ'k
conn.commit(); / e~
}catch(Exception e){ t:?<0yfp&
e.printStackTrace(); B|$\/xO
} finally{ uf{SxEa
try{ '0\0SL
if(ps!=null) { 5pNvzw
ps.clearParameters(); OlD7-c2L]
ps.close(); Ktg&G<%J0
ps=null; 5*G8W\
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} sRkz
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}catch(SQLException e){} o'x_g^ Y
DBUtils.closeConnection(conn); }M"-5K}
} >i><s>=I`
} `~w%Jf
public long getLast(){ X+(aQ
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return lastExecuteTime; >m)2ox_B
} Y-}hNZn"{
public void run(){ kw*Cr/'*
long now = System.currentTimeMillis(); '^P*F9
if ((now - lastExecuteTime) > executeSep) { R7\{w(`K
//System.out.print("lastExecuteTime:"+lastExecuteTime); $5 q{vy
//System.out.print(" now:"+now+"\n"); ?X8K$g
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); lB5[#z
lastExecuteTime=now; S>/I?(J
executeUpdate(); +1JZB*W
} hEdo,gF*
else{ Ymrpf
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); )_x8?:lv
} 30gZ_8C>}
} C%x(`S^/
} h=p-0 Mx .
//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 ^)eessZ
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类写好了,下面是在JSP中如下调用。 7|{%CckN
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<% a9mr-`<
CountBean cb=new CountBean(); T }8r;<P6
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); p ] $
CountCache.add(cb); S`'uUvAA
out.print(CountCache.list.size()+"<br>"); Ggxrj'r
CountControl c=new CountControl(); BIb{<tG^N
c.run(); "6[Ax{cM
out.print(CountCache.list.size()+"<br>"); KweHY,
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