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: |kjk{
NL1Ajms`
CountBean.java gI[xOK#
0(]C$*~mk
/* w'}b 8m(L
* CountData.java >2%!=q3)
* R+P1 +5
* Created on 2007年1月1日, 下午4:44 i7iL[+f]Q
* 6z~6o0s~
* To change this template, choose Tools | Options and locate the template under Ty7xjIs
* the Source Creation and Management node. Right-click the template and choose ?v6xaVg:
* Open. You can then make changes to the template in the Source Editor. Fvg>>HVu
*/ \\6/"
+dlN^P647
package com.tot.count; L,BuzU[1S
Uh{|@D
/** >Ka}v:E
* J#MUtpPdQ
* @author ?nE<Aig
*/ d7A vx
public class CountBean { jruwdm^
private String countType; Ww:,O48%
int countId; yoQ}m/Cj
/** Creates a new instance of CountData */ ~~z}yCl
public CountBean() {} y$'(/iyz
public void setCountType(String countTypes){ `StlG=TB8
this.countType=countTypes; TF2'-"2Y
} wMr*D['" #
public void setCountId(int countIds){ 8!sl) R
this.countId=countIds; icH\(
} 741Sd8
public String getCountType(){ 'b~,/lZd
return countType; h_n`E7&bG
} t[VA|1gG
public int getCountId(){ _e:c
22T'
return countId; l]C#bL>i
} ].w~FUa
} "2# #Fcu=
;<hLy(@
CountCache.java H[S[ y
hT go
/* 6fY-DqF!
* CountCache.java b1\.hi
* #TS:|=
* Created on 2007年1月1日, 下午5:01 9vZ:oO
* ZW7z[,tk<.
* To change this template, choose Tools | Options and locate the template under *MC+i$
* the Source Creation and Management node. Right-click the template and choose x4v@o?zW
* Open. You can then make changes to the template in the Source Editor. VUmf;~
*/ :J6 xYy$
gjFpM.D-.
package com.tot.count; #83`T&Xw*
import java.util.*; {#y~ Qk;T
/** &Ql$7:r
* m55|&Ux|
* @author > zA*W<g
*/ XCvL`
public class CountCache { 4M*Z1
public static LinkedList list=new LinkedList(); s k_TKN`+
/** Creates a new instance of CountCache */ AdD,94/
public CountCache() {} x/NjdK
public static void add(CountBean cb){ g|TWoRx:
if(cb!=null){ z_f^L %J0
list.add(cb); #fy3i+
} 6U9FvPJ
} X~g U$
} *q; u%; 4
pF/s5z
CountControl.java _$+BYK@
oZ5 ,y+L4
/* 4ibOVBG:*,
* CountThread.java InA=ty]"_U
* swKqsN.
* Created on 2007年1月1日, 下午4:57 LIE5of
* G,!{Q''w
* To change this template, choose Tools | Options and locate the template under #(7^V y&
* the Source Creation and Management node. Right-click the template and choose l#IN)">1
* Open. You can then make changes to the template in the Source Editor. 9CG&MvF c
*/ Yz)+UF,
w"{mDL}c
package com.tot.count; 9+#BU$*v
import tot.db.DBUtils; IN_O!c0e
import java.sql.*; i&^]qL|J
/** @d|3c7` A
* TXT!Ae
* @author A01PEVd@A
*/ #f@}$@
public class CountControl{ +;T\:'CU
private static long lastExecuteTime=0;//上次更新时间 !&},h=
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 'i<%kL@
/** Creates a new instance of CountThread */ %6\L^RP
public CountControl() {} ?{L5=X@$$
public synchronized void executeUpdate(){ n"w>Y)C(X)
Connection conn=null; Q[Gs%/>
PreparedStatement ps=null; `m}G{ jfk
try{ 6zIK%<
conn = DBUtils.getConnection(); 3/y"kl:<-
conn.setAutoCommit(false); Ax6zx
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); -HF1c
for(int i=0;i<CountCache.list.size();i++){ OP|X-
CountBean cb=(CountBean)CountCache.list.getFirst(); 40aD\S>
CountCache.list.removeFirst(); r:M0#
2
ps.setInt(1, cb.getCountId()); @HE<\Z{ KI
ps.executeUpdate();⑴ ASB3|uy _
//ps.addBatch();⑵ 5?A<('2
} O03F@v
//int [] counts = ps.executeBatch();⑶ q'9;
conn.commit(); [HhaBy9
}catch(Exception e){ FqZD'Uu7
e.printStackTrace(); $9h^tP'CV
} finally{ !yvw5As %
try{ @"B{k%+
if(ps!=null) { Wr@q+Whq
ps.clearParameters(); F$ckW'V
ps.close(); _FU}IfG>t
ps=null; 5&.I9}[)j
} ?69E_E
}catch(SQLException e){} fZ(k"*\MZ
DBUtils.closeConnection(conn); c_t7<
} 0+K<;5"63d
} r)B55;*Fh
public long getLast(){ ZFtJoGaR
return lastExecuteTime; R[kF(C&
} _C=01 %/
public void run(){ 3vkzN
long now = System.currentTimeMillis(); gH.$B'
if ((now - lastExecuteTime) > executeSep) { Ce~Pms]
//System.out.print("lastExecuteTime:"+lastExecuteTime); l3+G ]C&<
//System.out.print(" now:"+now+"\n"); g][n1$%
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Q3'P<"u
lastExecuteTime=now; mz<X$2]?
executeUpdate(); <?:h(IZe[
} 2Sk hBb=d
else{ h*Mt{A&'.&
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 0>"y)T3
} g-H,*^g+
} MShcZtN
} AF,;3G
//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 {{)pb>E
t*fH&8(
类写好了,下面是在JSP中如下调用。 og_ylCh:
3NdO3-~)
<% D~TlG@Pq
CountBean cb=new CountBean(); dA<SVk*0Q
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 4pZKm-dM^
CountCache.add(cb); a'?LC)^
out.print(CountCache.list.size()+"<br>"); O_ vH w^
CountControl c=new CountControl(); 3#aLCpVla
c.run(); Jx Kd
out.print(CountCache.list.size()+"<br>"); VA`VDUG,
%>