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: lgAoJ[
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CountBean.java B4/>H|
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/* jdP2Pf^^
* CountData.java t,Lrfv])
* >{]%F*p4
* Created on 2007年1月1日, 下午4:44 ]]![EHi(\
* TprTWod2]t
* To change this template, choose Tools | Options and locate the template under M.D1XX1/
* the Source Creation and Management node. Right-click the template and choose 1nM
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* Open. You can then make changes to the template in the Source Editor. <{p4V|:
*/ 4KAZ ':
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package com.tot.count; mUC)gA/
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/** A QU+mo
* G't$Qx,IC
* @author f)rq%N &
*/ FkDmP`Od
public class CountBean { %Xd[(Q)
private String countType; 5ta `%R_
int countId; (# c*M?g3
/** Creates a new instance of CountData */ f`(UQJ
public CountBean() {} M^Yh|%M
public void setCountType(String countTypes){ ja'T+!k
this.countType=countTypes; ,,.QfUj/&
} Po;W'7"Po`
public void setCountId(int countIds){ "Y.tht H
this.countId=countIds; !TH)
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} Kn{4;Xk\
public String getCountType(){ 3NqB
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return countType; hag$GX'2k
} c]-<vkpV
public int getCountId(){ Ny7 S
return countId; o[4}h:> dq
} l4YbK np]
} c]<5zyl"j1
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CountCache.java s)t@ol
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/* *R,5h2;
* CountCache.java q q`4<0 I>
* //MUeTxR
* Created on 2007年1月1日, 下午5:01
**0~K" ;\
* sdrfsrNvB-
* To change this template, choose Tools | Options and locate the template under %0?KMRr
* the Source Creation and Management node. Right-click the template and choose 3*bU6$|5FP
* Open. You can then make changes to the template in the Source Editor. qZh/IW
*/ aK~8B_5k8
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package com.tot.count; -ad{tJV|
import java.util.*; :kV#y
/** }#+^{P3 ;
* Po0A#Z l
* @author I,DS@SK
*/ QL/(72K
public class CountCache { jd"@t*ZV
public static LinkedList list=new LinkedList(); cZ*@$%_
/** Creates a new instance of CountCache */ O\tb R=
public CountCache() {} T Z@]:e:"b
public static void add(CountBean cb){ 7z,C}-q
if(cb!=null){ G_tCmu\
list.add(cb); `[yKFa
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} #z%fx
} est9M*Fn
} Kw^ 7>\
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CountControl.java I][*j
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/* Ee#q9Cx^J
* CountThread.java ?UR0:f:}oc
* }v{LRRi
* Created on 2007年1月1日, 下午4:57 $wa{~'
* 7EEl+;wK
* To change this template, choose Tools | Options and locate the template under LOYk9m
* the Source Creation and Management node. Right-click the template and choose G!##X: 6'
* Open. You can then make changes to the template in the Source Editor. C.P*#_R
*/ VQ@
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package com.tot.count; Y|qTyE%
import tot.db.DBUtils; {S\{Ii6
import java.sql.*; ?j.,Nw4FC
/** {YC@T(
* ]/6z;
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* @author H8jpxzXv
*/ 1GRCV8"Z^
public class CountControl{ >R_&Ouh:
private static long lastExecuteTime=0;//上次更新时间 J)>c9w
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 wHLLu~m\
/** Creates a new instance of CountThread */ q
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public CountControl() {} (WJRi:NP?
public synchronized void executeUpdate(){ v1JzP#
Connection conn=null; ~ Iuf}D;
PreparedStatement ps=null; djZqc5t
try{ S hWJ72c
conn = DBUtils.getConnection(); s8Q 5ui]
conn.setAutoCommit(false); :-Z2:/P
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); qR{=pR
for(int i=0;i<CountCache.list.size();i++){ hfTY.
CountBean cb=(CountBean)CountCache.list.getFirst(); F(n$
CountCache.list.removeFirst(); H?Wya.7
ps.setInt(1, cb.getCountId()); gQuw1
ps.executeUpdate();⑴ [|L<_.8
//ps.addBatch();⑵ B6 ;|f'e!
} 0+ '&`Q!u
//int [] counts = ps.executeBatch();⑶ j (d~aqW
conn.commit(); "k@/3
}catch(Exception e){ B$K=\6o
e.printStackTrace(); Q&;9x? e
} finally{ ?V=ZIGj
try{ ru%y
if(ps!=null) { EZGIf/ 3
ps.clearParameters(); *^4"5X@
ps.close(); eByz-,{P
ps=null; <lPG=Xt
} _H%c;z+
}catch(SQLException e){} q;CiV
DBUtils.closeConnection(conn); A)!*]o>U
} x,-75
} ioCsV
public long getLast(){ "S]TP$O D
return lastExecuteTime; jr."I+
} 3
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public void run(){ BWrxunHO
long now = System.currentTimeMillis(); BU_nh+dF
if ((now - lastExecuteTime) > executeSep) { AT3Mlz~7#
//System.out.print("lastExecuteTime:"+lastExecuteTime); tNI^@xdim1
//System.out.print(" now:"+now+"\n"); X_h}J=33Q
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); cT,sh~-x,
lastExecuteTime=now; m(!FHPvN
executeUpdate(); 4$<JHo
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} t*u:hex
else{ eym4=k ~
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); "8MF_Gu):
} 7$=InK
} KpGhQdR#
} ?`ZUR&
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//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 =,8]nwgo
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类写好了,下面是在JSP中如下调用。 r19
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<% +\9NDfYIA
CountBean cb=new CountBean(); H
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); a=2%4Wmz
CountCache.add(cb); CdQ!GS<'y
out.print(CountCache.list.size()+"<br>");
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CountControl c=new CountControl(); cwg"c4V
c.run(); z:*|a+cy
out.print(CountCache.list.size()+"<br>"); D,feF9
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