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: fBd +gT\S
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CountBean.java _W#27I
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/* Z@C
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* CountData.java s9`T% pg
* zLXtj-
* Created on 2007年1月1日, 下午4:44 7P|(j<JX6'
* S8,+6+_7
* To change this template, choose Tools | Options and locate the template under `O}.
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* the Source Creation and Management node. Right-click the template and choose &|E2L1
* Open. You can then make changes to the template in the Source Editor. {/0,lic
*/ gi;V~>kh
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package com.tot.count; oS,<2Z
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/** Dh +^;dQ6
* PL+fLCk,I
* @author 9'5,V{pj
*/ RXx
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public class CountBean { [>_(q|A6+
private String countType; )If[pw@j
int countId; &*)tqQeQf
/** Creates a new instance of CountData */ BTd'bD~EA
public CountBean() {} 6/#= dv
public void setCountType(String countTypes){ [Q 2t,tQx
this.countType=countTypes; q}\\p
} GF/p|I D
public void setCountId(int countIds){ \v-> '
this.countId=countIds; zRE7 w:
} Z p__
public String getCountType(){ D *LZ_
return countType; E!Fy2h>[Z
} ]&G5/]f
public int getCountId(){ <
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return countId; 1;:2 =8
} :&or'Yi}
} |g'sRTKJ
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CountCache.java TyBNRnkt
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/* Z(}x7j zW
* CountCache.java x(=kh%\;
* ap6Vmp
* Created on 2007年1月1日, 下午5:01 Aoo'i
* WX\%FJ
* To change this template, choose Tools | Options and locate the template under )E[5lD61
* the Source Creation and Management node. Right-click the template and choose n3|~X/I
* Open. You can then make changes to the template in the Source Editor. U<6k!Y9ny
*/ dl":?D4H
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package com.tot.count; ,-b{oS~u
import java.util.*; 2bxT%xH:g
/** xwRnrWd^6
* M"9
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* @author q90S>c,
*/ NI^Y%N
public class CountCache { 2Qy!Aa
public static LinkedList list=new LinkedList(); yZ!Eu#81
/** Creates a new instance of CountCache */ }zobIfIF
public CountCache() {} &J~S $
public static void add(CountBean cb){ \
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if(cb!=null){ W#lvH=y
list.add(cb); Bw#ubQJ8}
} Uv+pdRXn
} %#]T.g
} Qs?+vk?*h
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CountControl.java d#b{4zF"
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/* "pWdz}!
* CountThread.java AQiP2`?
* TAAsV#l
* Created on 2007年1月1日, 下午4:57 [y{ag{
* <#s-hQ
* To change this template, choose Tools | Options and locate the template under O?2<rbx
* the Source Creation and Management node. Right-click the template and choose n7MS{`
* Open. You can then make changes to the template in the Source Editor. / P:Hfq
*/ 0}^-, Q,
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package com.tot.count; "w'YZO]>
import tot.db.DBUtils; *xl7;s
import java.sql.*; ROjjN W`W
/** Gz6GU.IyQy
* {//F>5~[
* @author %zelpBu+
*/ fgp7 |;Y
public class CountControl{ qA~D*=
private static long lastExecuteTime=0;//上次更新时间 1tr>D:c\
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 SQ
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/** Creates a new instance of CountThread */ n47=eKd70
public CountControl() {} v]BQIE?R /
public synchronized void executeUpdate(){ JyqFFZ&
Connection conn=null; jo(Q`oxm!>
PreparedStatement ps=null; !}PFi T^
try{ GY",AL8f
conn = DBUtils.getConnection(); kIfb!
conn.setAutoCommit(false); >C-_Zv<!T\
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); c==Oio("
for(int i=0;i<CountCache.list.size();i++){ jF3!}*7,
CountBean cb=(CountBean)CountCache.list.getFirst(); 8x9kF]=
CountCache.list.removeFirst(); "{Be k<
ps.setInt(1, cb.getCountId()); o5D" <-=>
ps.executeUpdate();⑴ H4m6H)KOG
//ps.addBatch();⑵ 23f[i<4e
} ~`})x(!
//int [] counts = ps.executeBatch();⑶ X<m%EXvV
conn.commit(); xk*3,J6BK
}catch(Exception e){ <?zTnue
e.printStackTrace(); h/fCCfO,
} finally{ ^i8I 1@ =
try{ #w*pWD^
if(ps!=null) { _ <;Q=?'*
ps.clearParameters(); {.lF~cOu
ps.close(); ft'iv
ps=null; ommKf[h%i
} !U#++Zig%
}catch(SQLException e){} x7@WWFF>
DBUtils.closeConnection(conn); YEQW:r_h.S
} &CL|q+-
} osd^SnL1/5
public long getLast(){ I1myu Z
return lastExecuteTime; gZjOlp
} ob] lCX)
public void run(){ "pZ3
long now = System.currentTimeMillis(); g&"(- :
if ((now - lastExecuteTime) > executeSep) { 87K)qsv8
//System.out.print("lastExecuteTime:"+lastExecuteTime); ]v{fFmL
//System.out.print(" now:"+now+"\n"); zkp
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); V{h@nhq
lastExecuteTime=now; i)2))C
executeUpdate(); Ft7a\vn*B
} N-rmk
else{ ya{>=
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Z0=m:h
} +hg\DqO^M
} Y/S3)o
} HLe^|
//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 $CmX
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类写好了,下面是在JSP中如下调用。 &5.~XM;
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<% tqQ0lv^J
CountBean cb=new CountBean(); <c ovApx
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ~}5Ml_J$,l
CountCache.add(cb); 30_un
out.print(CountCache.list.size()+"<br>"); u3wC}Zo
CountControl c=new CountControl(); ;-?ZI$
c.run(); {}pqxouE
out.print(CountCache.list.size()+"<br>"); kppRQ Q*[
%>