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: :[J'B4>9
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CountBean.java .z, ot|
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/* 61W[
* CountData.java LEC=@) B
* Y=ksrs>w
* Created on 2007年1月1日, 下午4:44 z'9U.v'M)
* eXAJ%^iD
* To change this template, choose Tools | Options and locate the template under `kYcTFk
* the Source Creation and Management node. Right-click the template and choose *TgD{>s
* Open. You can then make changes to the template in the Source Editor. mMw--Gc?
*/ dT7!+)s5-
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package com.tot.count; hf\/2Vl
cBtQ2,<6
/** dwqR,|
* 6E{(_i
* @author PJL
[En*
*/ !LJ4
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public class CountBean { mRIBE9K+&
private String countType; \DcO.`L
int countId; "i,ZG$S#E
/** Creates a new instance of CountData */ ,Bs/.htQj
public CountBean() {} Ip|=NQL>
public void setCountType(String countTypes){ .dsB\C
this.countType=countTypes; $DW__h
} 30W.ks5(
public void setCountId(int countIds){ o8X? 1
this.countId=countIds; DMA`Jx
} cAq5vAqmg
public String getCountType(){ G_`Ae%'h
return countType; t=fr`|!
} w!jY(WKU
public int getCountId(){ P9)L1l<3I
return countId; ue*o>iohB
} {dYz|O<
} $;rvKco)%
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CountCache.java `<-/e%8
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/* 4BZ7R,m#.
* CountCache.java [r1dgwh8
* +~"(Wooi
* Created on 2007年1月1日, 下午5:01 T037|k a{
* io UO0
* To change this template, choose Tools | Options and locate the template under P4:Zy;$v!
* the Source Creation and Management node. Right-click the template and choose 0),fY(D2T
* Open. You can then make changes to the template in the Source Editor. DWS#q|j`"
*/ &88c@Ksn
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package com.tot.count; eV"s5X[$
import java.util.*; (}rBnD
/** HWFLu
* s Fx0
* @author 9)>+r6t
*/ (7ujJ}#,
public class CountCache { 2(5/#$t
public static LinkedList list=new LinkedList(); eo~b]D
/** Creates a new instance of CountCache */ /!%?I#K{Wq
public CountCache() {} tn;{r
public static void add(CountBean cb){ /VD[: sU7
if(cb!=null){ ^VEaOKMr
list.add(cb); V -_MwII-
} $o/i /
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}
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} Qq%~e41ec
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CountControl.java $/
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/* tRo` @eEX
* CountThread.java ]Upr<!
* 5uV_Pkb?8
* Created on 2007年1月1日, 下午4:57 w'9!%mr
* 7\N }QP0"u
* To change this template, choose Tools | Options and locate the template under 7K1_$vd
* the Source Creation and Management node. Right-click the template and choose v\E6N2.S
* Open. You can then make changes to the template in the Source Editor. MnlD87x@X
*/ r4d#;S9{o
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package com.tot.count; nNeCi
import tot.db.DBUtils; 2Bi?^kQ#
import java.sql.*; ilyF1=bp
/** -hq^';,
* wYLodMaYH
* @author Lyz8DwZ
*/ zN9#qlfv
public class CountControl{ _2{2Xb
private static long lastExecuteTime=0;//上次更新时间 \Rs9B .
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 SYh>FF"
/** Creates a new instance of CountThread */ @urZ
public CountControl() {} bk&kZI.D
public synchronized void executeUpdate(){ ;GKL[tI"
Connection conn=null; 9{e/ V)
PreparedStatement ps=null; o'Fyo4Qd
try{ abv*X1
conn = DBUtils.getConnection(); l%xTF@4e
conn.setAutoCommit(false); ?op;#/Q(
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); \4>w17qng
for(int i=0;i<CountCache.list.size();i++){ eSHsE3}h
CountBean cb=(CountBean)CountCache.list.getFirst(); {|<yZ,,p
CountCache.list.removeFirst(); 7rYBFSp
ps.setInt(1, cb.getCountId()); =oM#]M'G+(
ps.executeUpdate();⑴ = l:k($%%
//ps.addBatch();⑵ maa$kg8U*!
} KoA +Vv9
//int [] counts = ps.executeBatch();⑶ 7w]3D
conn.commit(); N|%r5%
}catch(Exception e){ =k,?+h~
e.printStackTrace(); X,Rl&K\b"
} finally{ #;5Qd'
try{ hk$I-
if(ps!=null) { O hRf&5u$
ps.clearParameters(); g7^|(!Y%
ps.close(); _s<s14+od
ps=null; a47e
} >?_}NZ,y
}catch(SQLException e){} y^[t3XA6Q
DBUtils.closeConnection(conn); 9_4(}|"N|
} :pNS$g[
} cucmn*o?
public long getLast(){ V7`vLs-
return lastExecuteTime; sAPQbTSM
} RNQq"c\
public void run(){ :I2,
long now = System.currentTimeMillis(); F=a
if ((now - lastExecuteTime) > executeSep) { We\i0zUU
//System.out.print("lastExecuteTime:"+lastExecuteTime); s: iBl/N}
//System.out.print(" now:"+now+"\n"); c`&g.s@N\
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); R4T@ ]l&W
lastExecuteTime=now; bg/=P>2
executeUpdate(); P{BW^kAdH
} D?UURUR f
else{ W /*?y &
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 2(x|
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} !* KQ2#e
} ExN$J
} =CD.pw)B1
//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 !
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类写好了,下面是在JSP中如下调用。 UbGnU_}
q`.=/O'
<% dA E85
CountBean cb=new CountBean(); 9[teG5wAa
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 23Dld+E&
CountCache.add(cb); Nr+~3:3
out.print(CountCache.list.size()+"<br>"); OCJt5#e~A
CountControl c=new CountControl(); ~ ^D2]j
c.run(); p~Cz6n
out.print(CountCache.list.size()+"<br>"); 7+}WU 4
%>