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: E; Z1HF
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CountBean.java #>\+6W17U
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/* VjVL/SO/
* CountData.java %7bZnK`C
* LK[%}2me
* Created on 2007年1月1日, 下午4:44 <oWoJP`G
* x?B 8b-*
* To change this template, choose Tools | Options and locate the template under K Z)p\p<1
* the Source Creation and Management node. Right-click the template and choose m2$Qp{C6H
* Open. You can then make changes to the template in the Source Editor. uEKa
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*/ Tb6c]?'U
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package com.tot.count; GT"gB$Mh
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/** F[SYs/M
* l6EDl0~r
* @author LAwAFma>
*/ %@d~)f
public class CountBean { *aF<#m v
private String countType; :X6A9jmd
int countId; _n+./B
/** Creates a new instance of CountData */ hd}"%9p
public CountBean() {} [8QE}TFic
public void setCountType(String countTypes){ (7g1eEK%
this.countType=countTypes; \;G 97o
} J<{@D9r9<~
public void setCountId(int countIds){ <ZM8*bqi
this.countId=countIds; `cgSyRD]
} i`1QR@11
public String getCountType(){ sy|{}NkA!
return countType; <v)Ai;l,
} !mX 2
public int getCountId(){ c*g(R.!
return countId; {6yiD
} Lc<C1I 5=
} W|FP j^*t
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CountCache.java EI29;
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/* `_;VD?")*l
* CountCache.java *?`:=
* Nz&J&\X)tD
* Created on 2007年1月1日, 下午5:01 yU(k;A-
* 2Xm\; 7
* To change this template, choose Tools | Options and locate the template under 3' WS6B+
* the Source Creation and Management node. Right-click the template and choose e_BOzN~c
* Open. You can then make changes to the template in the Source Editor. X192Lar
*/ =kspHP<k
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package com.tot.count; f&S,l3H<
import java.util.*; h.6yI
/** WlnI`!)d
* U9KnW]O%"
* @author ,&sBa{0
*/ K6.*)7$#
public class CountCache { " (+>#
public static LinkedList list=new LinkedList(); m*BtD-{
/** Creates a new instance of CountCache */ K/y#hP
public CountCache() {} '~E&^K5hr
public static void add(CountBean cb){ [lsr[`SJ<
if(cb!=null){ q
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list.add(cb); TY,w3E_
} ,!f*OWnZ
} shlL(&Py
} .jhuC#x{/
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CountControl.java PT|W{RlNl
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/* L`ZH.fN
* CountThread.java m#'2
3
* W)F2X0D>
* Created on 2007年1月1日, 下午4:57 Vl!Z|}z
* 7K`A2
* To change this template, choose Tools | Options and locate the template under L44-: 3
* the Source Creation and Management node. Right-click the template and choose 1_7}B4
* Open. You can then make changes to the template in the Source Editor. <8Qa"<4f;
*/ _AQ :<0/#
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package com.tot.count; AG#5_0]P~
import tot.db.DBUtils; =S-'*F
import java.sql.*; 6M"]p
/** 6|05-x|
* i%M2(8&^Q
* @author ~PUz/^^
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*/ >sP-)ZeuU[
public class CountControl{ 33\{S$p
private static long lastExecuteTime=0;//上次更新时间 \HDRr*KO
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 )jp#|#h
/** Creates a new instance of CountThread */ 6P'
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public CountControl() {} 'Z-jj2t}
public synchronized void executeUpdate(){ G1Cn[F;e
Connection conn=null; }0T1* .Cz
PreparedStatement ps=null; f4zd(J
try{ =@m|g )
conn = DBUtils.getConnection(); :<s)QD
conn.setAutoCommit(false); +EcN[-~
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Od'!v &
for(int i=0;i<CountCache.list.size();i++){ ]w FFGy
CountBean cb=(CountBean)CountCache.list.getFirst(); 9[|Ql
CountCache.list.removeFirst(); Pe/cwKCI
ps.setInt(1, cb.getCountId()); #5T+P8
ps.executeUpdate();⑴ +"a .,-f!
//ps.addBatch();⑵ ~)}npS;
} DL2gui3
//int [] counts = ps.executeBatch();⑶
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conn.commit(); POc<
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}catch(Exception e){ S@zsPzw
e.printStackTrace(); E'e#axF;
} finally{ '?_;s9)
try{ gQ*0Mk
if(ps!=null) { r9G<HKl
ps.clearParameters(); R{3f5**0
ps.close(); jGEUl=W
ps=null; L
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} &|H?J,>
}catch(SQLException e){} V2%FWo|
DBUtils.closeConnection(conn); W\zg#5fmK
} X#(?V[F]
} x<"e} Oo
public long getLast(){ &@A(8(%
return lastExecuteTime; :a3Pnq$]E
} 5A/G?
public void run(){ cp2e,%o
long now = System.currentTimeMillis(); zHr1FxD
if ((now - lastExecuteTime) > executeSep) { lx~!FLn
//System.out.print("lastExecuteTime:"+lastExecuteTime); Ud:v3"1
//System.out.print(" now:"+now+"\n"); rU5gQq;
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); C]-Z+9Vvv
lastExecuteTime=now; OUe@U;l{Z
executeUpdate(); Rw*l#cr=.
} &D
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else{ IyYC).wU}
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); T<DQi
} _I~W!8&w>
} CO1D.5
} 1A">tgA1
//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 ,~gY'Ql
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类写好了,下面是在JSP中如下调用。 '>Y"s|
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<% ~jmHzFkQ
CountBean cb=new CountBean(); ld4QhZia
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); eM+]KG)}
CountCache.add(cb); xe2Ap[Y'M
out.print(CountCache.list.size()+"<br>"); _;{n+i[
CountControl c=new CountControl(); "a;JQ:
c.run(); k#E D#']N
out.print(CountCache.list.size()+"<br>"); Q! ]
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