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: ;FI'nL
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CountBean.java e"1mdw"
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/* wsdZwik
* CountData.java sudh=_+>
* &$ }6:
* Created on 2007年1月1日, 下午4:44 MoxWnJy}
* dkC_Sh{
* To change this template, choose Tools | Options and locate the template under #0)TS
* the Source Creation and Management node. Right-click the template and choose 6l,6k~Z9
* Open. You can then make changes to the template in the Source Editor. O0y0'P-rJq
*/ 75>%!mhM
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package com.tot.count; `pv
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/** M*'8$|Z
* gHgqElr(
* @author C{U*{0}
*/ '`tFZfT
public class CountBean { ty[%:eG#
private String countType; Ud"_[JtGM
int countId; <|'ETqP<+
/** Creates a new instance of CountData */ ,or;8aYc#
public CountBean() {} [-`s`g-
public void setCountType(String countTypes){ (4z_2a(Dl,
this.countType=countTypes; Gy+c/gK
} yfwR``F
public void setCountId(int countIds){ wo62R&ac
this.countId=countIds; A99;bf}"
} Zk7!CJVM
public String getCountType(){ ;=0-B&+v
return countType; P:J|![
} } A6z%|d
public int getCountId(){ m5/]+xdNX
return countId; 3]iw3M
} f7zB_hVDmE
} V(XU^}b#
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CountCache.java C-_u`|jQ
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/* Bd*Ok]
* CountCache.java ^69(V LK
* TN Z-0
* Created on 2007年1月1日, 下午5:01 -~sW@u)O
* 9k4z__K e
* To change this template, choose Tools | Options and locate the template under p Dg!Cs
* the Source Creation and Management node. Right-click the template and choose io"NqR#"v
* Open. You can then make changes to the template in the Source Editor. zp4@T)
*/ ;B<rw^h5
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package com.tot.count; Tq^B>{S"
import java.util.*; UU}Hs}
/** A?-t`J
* /: -ig .YY
* @author ;
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*/ \k$cg~
public class CountCache { e Vj 8u
public static LinkedList list=new LinkedList(); o7gZc/?n
/** Creates a new instance of CountCache */ F:Vl\YZ
public CountCache() {} , iEGf-!k
public static void add(CountBean cb){ 8~!h8bkC
if(cb!=null){ dr8Q>(ZY
list.add(cb); %U<lS.i
} a@_n>$LZL
} bTx4}>=5l
} A\"4[PXpQ
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CountControl.java Q(WfWifu-|
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/* ]Gj%-5G
* CountThread.java \HMuVg'Q
* ko{&~
* Created on 2007年1月1日, 下午4:57 yqJ>Z%)hf
* .K_50%s
* To change this template, choose Tools | Options and locate the template under +CQIm!Sp
* the Source Creation and Management node. Right-click the template and choose l7WZ" 6d
* Open. You can then make changes to the template in the Source Editor. /w5c:BH
*/ %}
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package com.tot.count; @Rd`/S@
import tot.db.DBUtils; E)'T;%
import java.sql.*; uw>y*OLU+
/** '*U_!RmQ
* _0&U'/cs
* @author rXrIGgeM
*/ .dc|?$XV
public class CountControl{ 5n::]Q%=D
private static long lastExecuteTime=0;//上次更新时间 M6[O>z
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 j<?k$8H
/** Creates a new instance of CountThread */
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public CountControl() {} bHDZ=Ik
public synchronized void executeUpdate(){ ZSwhI@|
Connection conn=null; ASS<XNP
PreparedStatement ps=null; 80U(q/H%9
try{ Pr/q?qZY
conn = DBUtils.getConnection(); $?&distJ
conn.setAutoCommit(false); t,~feW,
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Ch=jt*0
for(int i=0;i<CountCache.list.size();i++){ YyY?<<z%
CountBean cb=(CountBean)CountCache.list.getFirst(); 47&p*=
CountCache.list.removeFirst(); | m#"
ps.setInt(1, cb.getCountId()); uE#"wm'J
ps.executeUpdate();⑴ ![[:Z
//ps.addBatch();⑵ P$__c{1\
} Vvn~G.&)
//int [] counts = ps.executeBatch();⑶ <P5 7s+JK
conn.commit(); BgsU:eKe
}catch(Exception e){ ~:b5UIAk
e.printStackTrace(); uY&t9L8
} finally{ 'Urx83
try{ 0b=00./o
if(ps!=null) { 9WL$3z'*
ps.clearParameters();
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ps.close(); ;A?86o'?
ps=null; :9|CpC`.
} oPxh+|0?
}catch(SQLException e){} I_`$$-|
DBUtils.closeConnection(conn); 2N&S__
} q' t"
} @Bsvk9}
public long getLast(){ 9 b&HqkXX
return lastExecuteTime; PmUq~YZ7
} e=i9l
public void run(){ dY?>:ce
long now = System.currentTimeMillis(); 1mv8[^pF
if ((now - lastExecuteTime) > executeSep) { /p{$HkVw
//System.out.print("lastExecuteTime:"+lastExecuteTime); \NL*$SnxP
//System.out.print(" now:"+now+"\n"); q] '2'"k
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); !imjfkG
lastExecuteTime=now; ?KFj=Yo
executeUpdate(); 2 o5u02x
} z7JhS|
else{ xc?=fv
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); _BND{MsX
} _y9NDLRs8
} JPe<qf-
} ,/-DAo~O
//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 \k%j
RPTIDA))
类写好了,下面是在JSP中如下调用。 u0Opn=(_
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<% Cyp%E5b7
CountBean cb=new CountBean(); 'Y5l3xQk
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); nsXyReWka
CountCache.add(cb); n?NUnFA
out.print(CountCache.list.size()+"<br>");
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CountControl c=new CountControl(); XTq+ 9
c.run(); Yx"~_xA/u
out.print(CountCache.list.size()+"<br>"); p v*f]Yzx
%>