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: ~\^8
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CountBean.java .{}t[U
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/* |N g[^
* CountData.java 3o?Lz7L
* ZO`d
* Created on 2007年1月1日, 下午4:44 25TEbp[dy
* P-mrH
* To change this template, choose Tools | Options and locate the template under i||YD-hkK
* the Source Creation and Management node. Right-click the template and choose {Xp.}c
* Open. You can then make changes to the template in the Source Editor. ?-VN+
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*/ <Du*Re6g
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package com.tot.count; 94R+S-|P
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/** Yv;aQF"a
* -lp_~)j^
* @author 9+/|sU\.%
*/ 1@ina`!1O
public class CountBean { ^J G}|v3$
private String countType; ks;%f34
int countId; ^T[#rNkeL
/** Creates a new instance of CountData */ }dxdxnVt
public CountBean() {} F&P)mbz1
public void setCountType(String countTypes){ 0eLK9u3<
this.countType=countTypes; B^qB6:\t
} `7j,njCX.
public void setCountId(int countIds){ 5Q88OxH
this.countId=countIds; MnQ_]cC
} $@xkKe"
public String getCountType(){ oHYD6qJX{
return countType; s6egd%r
} HI?>]zz|
public int getCountId(){ {\e}43^9N
return countId; }8SHw|-
} 4EK[gM8
} V OX>Sl
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CountCache.java Nh))U
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/* rQqtejcfx
* CountCache.java 7[)(;-
* !9
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* Created on 2007年1月1日, 下午5:01 9p.>L8
*
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* To change this template, choose Tools | Options and locate the template under t0q@]
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* the Source Creation and Management node. Right-click the template and choose Xx^c?6YM
* Open. You can then make changes to the template in the Source Editor. jDnh/k0{d
*/ kel {9b=i
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package com.tot.count; Ef!F;D e)A
import java.util.*; )\(pDn$W
/** G$j8I~E@
* *G^]j
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* @author *+AP}\p0F
*/ \
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public class CountCache { ka*UyW}
public static LinkedList list=new LinkedList(); yV. P.Q
/** Creates a new instance of CountCache */ . ~<+
public CountCache() {} 5"Yw$DB9
public static void add(CountBean cb){ g9XtE
if(cb!=null){ l.BNe)1!22
list.add(cb); DH^^$)
} [=Z{y8#:J
} .>YJ95&\
} ~I<y^]2{
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CountControl.java h2>0#Vp3j
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/* b$`O|S
* CountThread.java .phQ7":`
* ^wlep1D
* Created on 2007年1月1日, 下午4:57 <'-me09C*
* FuKNH~MevQ
* To change this template, choose Tools | Options and locate the template under _X[c19q
* the Source Creation and Management node. Right-click the template and choose J\V(MN,
* Open. You can then make changes to the template in the Source Editor. [OcD#~drO
*/ riL!]'akV
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package com.tot.count; 0 Yp;?p^
import tot.db.DBUtils; {>Px.%[<
import java.sql.*; 5*AKl< Jl
/** sn(}5;
* `9-Zg??8r
* @author J$;)TI
*/ }>w4!
public class CountControl{ (
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private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 msylb~ ^
/** Creates a new instance of CountThread */ J^:~#`8
public CountControl() {} O^#u%/
public synchronized void executeUpdate(){ 5glGlD6R
Connection conn=null; Mx"tUoU6z
PreparedStatement ps=null; MF`'r#@:wa
try{ yKJ^hv"#
conn = DBUtils.getConnection(); YLGLr@:q
conn.setAutoCommit(false); Q)>'fZ)
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); H<;j&\$q
for(int i=0;i<CountCache.list.size();i++){ yH^*Fp8V
CountBean cb=(CountBean)CountCache.list.getFirst(); R 6Em^A/>
CountCache.list.removeFirst(); fm0(
ps.setInt(1, cb.getCountId()); Xhi?b|
ps.executeUpdate();⑴ w.f[)
//ps.addBatch();⑵ 9YABr>
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} $b} +5
//int [] counts = ps.executeBatch();⑶ #pfosC[
conn.commit(); JyO lVs<T
}catch(Exception e){ 7%"7Rb^@
e.printStackTrace(); sXxO{aeev
} finally{ GHY>DrXO1u
try{ gwJu&HA/
if(ps!=null) { I>aa'em
ps.clearParameters(); Y>~JI;Cu`
ps.close(); Q_.Fw\l$`
ps=null; P{18crC[1
} vEGK{rMA
}catch(SQLException e){} :8rCCop
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DBUtils.closeConnection(conn); @k<~`S~|
} 'Aj>+H<B
} EB<q.
public long getLast(){ S!_?# ^t
return lastExecuteTime; "'Uk0>d=_I
} /&7Yi_]r
public void run(){ #LJ-IDuF!
long now = System.currentTimeMillis(); Ck?: 8YlF
if ((now - lastExecuteTime) > executeSep) { W?-BT >#s
//System.out.print("lastExecuteTime:"+lastExecuteTime); M7,MxwZ0k
//System.out.print(" now:"+now+"\n"); >N-%
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); "6Uj:9
lastExecuteTime=now; i5Q<~;Z+
executeUpdate();
}8 _9V|E
} J_|x^
else{ yan[{h]EZ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); _#mqg]W '
} Xkom@F~]
} ton`ji\^
} B}+9U
//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 uFZB8+
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类写好了,下面是在JSP中如下调用。 [dlH
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<% mcr#Ze
CountBean cb=new CountBean(); "%*lE0Tx
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ( y*X8
CountCache.add(cb); !#1A7[WN
out.print(CountCache.list.size()+"<br>"); X388Gs;e
CountControl c=new CountControl(); %+a@|Z
c.run(); mX@*2I
out.print(CountCache.list.size()+"<br>"); y51D-vj
%>