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: 6,q}1-
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CountBean.java iir]M`A.-
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/* HDY2<Hzc
* CountData.java EDf"1b{PX
* Oe/\@f0bLT
* Created on 2007年1月1日, 下午4:44 (:P-ef$]C
* Gjh8>(
* To change this template, choose Tools | Options and locate the template under <X b B;
* the Source Creation and Management node. Right-click the template and choose mhDC1lXF
* Open. You can then make changes to the template in the Source Editor. i=^!?
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*/ J )DFH~p
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package com.tot.count; 5SNa~
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/** %qYiE!%&
* -E(0}\
* @author Glw_<ag[
*/ f"}g5eg+
public class CountBean { Lq6R_udp
private String countType; 'C2X9/!,
int countId; s9)U",
/** Creates a new instance of CountData */ O DO'!T-
public CountBean() {} O8Dav^\y?
public void setCountType(String countTypes){ :[r/
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this.countType=countTypes; '=X)0GG
}
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public void setCountId(int countIds){ ,|RN?1 ?U
this.countId=countIds; L]kd.JJvy
} r&/M')}?Lw
public String getCountType(){ !w;oVPNg
return countType; R0A|}Ee*
} N7
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public int getCountId(){ ^tTASK
return countId; N r,Qu8
} cM hBOm*
} E;tEmGf6F
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CountCache.java fFYfb4o
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/* e"D%eFkDW
* CountCache.java N|@jHxy
* o^ zrF
* Created on 2007年1月1日, 下午5:01 y9)w(y!
* pv[Gg^
* To change this template, choose Tools | Options and locate the template under !Soz??~o/
* the Source Creation and Management node. Right-click the template and choose Q_r}cL/A
* Open. You can then make changes to the template in the Source Editor. H _0F:e
*/ >2t.7UhDI
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package com.tot.count; YLsOA`5X
import java.util.*; 2if7|o$=
/** MfA@)v
* /Bw
<?:
* @author q)j_QbW)
*/ TKe\Bi
public class CountCache { D>fg
public static LinkedList list=new LinkedList(); :*} -,{uX
/** Creates a new instance of CountCache */ 'EHtA9M
public CountCache() {} YWFq&II|Z
public static void add(CountBean cb){ uo8[,'
if(cb!=null){ omMOA
list.add(cb); 2rV]n
} OAauD$Hh
} \_]X+o;
} SNJSRqWL/
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CountControl.java :;hz!6!
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/* C<Z{G%Qm
* CountThread.java U EjP`
* X`6"^
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* Created on 2007年1月1日, 下午4:57 7 'q *(v
* QdrZi.qKH
* To change this template, choose Tools | Options and locate the template under nZ'-3
* the Source Creation and Management node. Right-click the template and choose ?XbM
* Open. You can then make changes to the template in the Source Editor. {sfA$ d0
*/ uc>":V
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package com.tot.count; w*M&@+3I
import tot.db.DBUtils; oo\7\b#Jx
import java.sql.*; $<QrV,T
/** d%za6=M
* AU1U?En
* @author E|vXM"zFl
*/ 9Vru,7g
public class CountControl{ U4.$o]58
private static long lastExecuteTime=0;//上次更新时间 IIG9&F$G
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 _a#k3r
/** Creates a new instance of CountThread */ ,v%'2[}
public CountControl() {} 4_`(c1oA
public synchronized void executeUpdate(){ 1Q/=s,{u
Connection conn=null; Kh$Q9$
PreparedStatement ps=null; 6CCm1F{`
try{ AP1&TQ,&
conn = DBUtils.getConnection(); r7,}"Pl
conn.setAutoCommit(false); p0[+Zm{#l
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); K9{RU4<
for(int i=0;i<CountCache.list.size();i++){ oY4^CGk=
CountBean cb=(CountBean)CountCache.list.getFirst(); yeI>b 1>Q
CountCache.list.removeFirst(); >UQY3C
ps.setInt(1, cb.getCountId()); 5a-x$Qb9
ps.executeUpdate();⑴ 4[(NxXH8M
//ps.addBatch();⑵ I>GBnx
L
} rz0)S
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//int [] counts = ps.executeBatch();⑶ B[I9<4}
conn.commit(); [j}JCmWY
}catch(Exception e){ _i_P@I<M|~
e.printStackTrace(); " Lh&s<[
} finally{ [l3ys
try{
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if(ps!=null) { 6w=`0r3hy
ps.clearParameters();
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ps.close(); <iA\ZS:
ps=null; 2t4\L3
} Mf2F LrAh
}catch(SQLException e){} q3<kr<SP
DBUtils.closeConnection(conn); En:>c
} 6`@b@Kd
} F"bz<{
public long getLast(){ =?c""~7
return lastExecuteTime; hrm<!uKn
} au04F]-|j8
public void run(){ vK%*5
long now = System.currentTimeMillis(); -p>~z )
if ((now - lastExecuteTime) > executeSep) { -@e2/6Oi
//System.out.print("lastExecuteTime:"+lastExecuteTime); d[>HxPwo
//System.out.print(" now:"+now+"\n"); [~u!*W
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); f4
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lastExecuteTime=now; zXM,cV/s
executeUpdate(); ?G5,}%
} ?!K6")SE
else{ -72EXO=|
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); P}]o$nWT
} 9vz\R-un
} 4-t^?T:qF
} 5f{P% x(
//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 :\vs kk),
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类写好了,下面是在JSP中如下调用。 )S
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<% 43pe6 ^.
CountBean cb=new CountBean(); |mP};&b
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ^$50[
CountCache.add(cb); 5Yhcnwdm!
out.print(CountCache.list.size()+"<br>"); BZ=I/L
CountControl c=new CountControl(); \"1>NJn&k)
c.run(); Z6rhInIY
out.print(CountCache.list.size()+"<br>"); MoE&)~0u&
%>