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: cvfr)K[0
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CountBean.java |Clut~G
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/* HsHB!mQV
* CountData.java j.L-{6_s>~
* D0#x
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* Created on 2007年1月1日, 下午4:44 !H irhDN
* u(wGl_
* To change this template, choose Tools | Options and locate the template under }c}|
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* the Source Creation and Management node. Right-click the template and choose [h34d5'w
* Open. You can then make changes to the template in the Source Editor. Ie`13 L2
*/ QZ:8+[oy
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package com.tot.count; TT4./R:
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/** %JHGiCv|
* R%qGPO5Z\c
* @author ^*S)t.
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*/ @g$Gti
public class CountBean { N%"Y
private String countType; 72Iy^Y[MX
int countId; "Za>ZRR
/** Creates a new instance of CountData */ '
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public CountBean() {} n1&% e6XhO
public void setCountType(String countTypes){ S<WdZ=8sA
this.countType=countTypes; SOi*SwQ8
} , 'ZD=4_
public void setCountId(int countIds){ LjUy*mxw
this.countId=countIds; lq> +~zX{
} #&m0WI1
public String getCountType(){ o;=l^-
return countType; r!HwXeEn/
} JoN\]JL\,
public int getCountId(){ u
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return countId; #z2rzM@/:
}
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} K!'AkTW+-
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CountCache.java w -
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/* DiEluA&w9
* CountCache.java M5*{
* I{lT> go
* Created on 2007年1月1日, 下午5:01 ,>:;#2+og
* #L{OV)a<
* To change this template, choose Tools | Options and locate the template under 3'c0#h@VD
* the Source Creation and Management node. Right-click the template and choose N\#MwLm
* Open. You can then make changes to the template in the Source Editor. H*Kj3NgY
*/ e=Z,
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package com.tot.count; Fx
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import java.util.*; f"9q^
/** oA =4=`
* +AHUp)
* @author W0k0$\iX
*/ $T`<Qq-r
public class CountCache { )Lwc
public static LinkedList list=new LinkedList(); 4&_NJ\
/** Creates a new instance of CountCache */ kIGbG;"_
public CountCache() {} 9P~\Mpk
public static void add(CountBean cb){ `xywho%/Y
if(cb!=null){ gOr%!QaF
list.add(cb); `S2[5i
} 0qo)."V{
} T.We: ,{
} AjT%]9
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CountControl.java Pj4/xX
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/* h~p>re
* CountThread.java o4%y>d)
* )EL!D%<A
* Created on 2007年1月1日, 下午4:57 >layJt
* +> WM[o^I
* To change this template, choose Tools | Options and locate the template under {2+L@
* the Source Creation and Management node. Right-click the template and choose z j/!In
* Open. You can then make changes to the template in the Source Editor. EC\yzH*X
*/ wQiX<)O
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package com.tot.count; :k3Nt5t!
import tot.db.DBUtils; ;}1xn3THCn
import java.sql.*; rDQ!zlg>l
/** c{&*w")J
* ,WG<hgg-U)
* @author :^fcC[$K
*/ sz)oZPu|
public class CountControl{ ']>Mp#j
private static long lastExecuteTime=0;//上次更新时间 _x?uU
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ObE,$_ k
/** Creates a new instance of CountThread */ ;+tpvnV;]
public CountControl() {} ~,BIf+\XF
public synchronized void executeUpdate(){ :sP!p`dl
Connection conn=null; /-qxS <?o
PreparedStatement ps=null; :LQ5u[g$\
try{ K,e w >U
conn = DBUtils.getConnection(); x#Q>J"g
conn.setAutoCommit(false); 7yx$Nn`(
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); >A<bBK#
for(int i=0;i<CountCache.list.size();i++){ v k?skN@
CountBean cb=(CountBean)CountCache.list.getFirst(); V`RNM%Y
CountCache.list.removeFirst(); :pF_GkG
ps.setInt(1, cb.getCountId()); <]T` 3W9
ps.executeUpdate();⑴ gCN$}
//ps.addBatch();⑵ Qed.4R:o
} MUA%^)#u4Q
//int [] counts = ps.executeBatch();⑶ gt ";2,;X
conn.commit(); hTEx]# (
}catch(Exception e){ m@Qt.4m%g
e.printStackTrace(); X5`A GyX
} finally{ r.T<j.\
try{ +]|Z%;im
if(ps!=null) { ;]w<&C!=
ps.clearParameters(); Udc=,yo3Qm
ps.close(); 1|?05<8
ps=null; %uoQ9lD'
} X5khCLHi
}catch(SQLException e){} fnNYX]_bk
DBUtils.closeConnection(conn); T`9u!#mT=
} VL/|tL>E^
} :Mcu
public long getLast(){ \oEo~
return lastExecuteTime; f_imyzP
} 581e+iC~<H
public void run(){ t(+)#
long now = System.currentTimeMillis(); ^<:sdv>Y5
if ((now - lastExecuteTime) > executeSep) { .(X
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//System.out.print("lastExecuteTime:"+lastExecuteTime); x+h~gckLb
//System.out.print(" now:"+now+"\n"); 1$2D O
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); X5]TY]
lastExecuteTime=now; \y88d4zX
executeUpdate(); Fk6x<^Q<w
} 8UMFq
else{ *5wu
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); uu/+.9
} AxZD-|.
} @_"9D y Y%
} v|ck>_"
.
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 oP2fX_v1x
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类写好了,下面是在JSP中如下调用。 )OLq_':^@
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<% R.s^o]vT
CountBean cb=new CountBean(); eVR5Xar
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); v$)q($}p
CountCache.add(cb); A+&xMM2Wj
out.print(CountCache.list.size()+"<br>"); 2TES>}
CountControl c=new CountControl(); &I({T`=
c.run();
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out.print(CountCache.list.size()+"<br>"); 8`]=C~G
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