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: Bskp&NV':
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CountBean.java +IWH7 qRtp
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/* *>KBDFI
* CountData.java 5C9b*]-#
* e5>'H!)
* Created on 2007年1月1日, 下午4:44 Q`<{cFsU
* xlS*9>Ij
* To change this template, choose Tools | Options and locate the template under f4b9o[,s2e
* the Source Creation and Management node. Right-click the template and choose P .m@|w&.K
* Open. You can then make changes to the template in the Source Editor. .Mb[j1L^
*/ ur\6~'l4
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package com.tot.count;
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/** 32<D9_
* Qk:Lo*!
* @author JiaR*3#
*/ #~|k EGt
public class CountBean { P,{Q k~iu
private String countType; p@su:B2Rl
int countId; 2CO/K_Q
/** Creates a new instance of CountData */ z{
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public CountBean() {} 'R79,)|;[
public void setCountType(String countTypes){ :xPo*#[Z(A
this.countType=countTypes; 7TMq#Pb
} gCb+hQq\
public void setCountId(int countIds){ >8"Svt$
this.countId=countIds; M% \T5
} DFK@/.V
public String getCountType(){ GXVx/)H
return countType; vTO9XHc E
} BsIF3sS#9
public int getCountId(){ [~s+,OO9)
return countId; A~bSB
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} _|#abLh%
} B2ln8NF#Q
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CountCache.java 0% rDDB
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/* Nrr})
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* CountCache.java Ak9{P`
* T,pr&1]Lw
* Created on 2007年1月1日, 下午5:01 /GIGE##1F
* xo_STLAw
* To change this template, choose Tools | Options and locate the template under rMDvnF
* the Source Creation and Management node. Right-click the template and choose rF-SvSj}
* Open. You can then make changes to the template in the Source Editor. S)W xTE9
*/ RW. qw4
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package com.tot.count; 5-|!mSd
import java.util.*; DQQ]grU
/** My8d%GfM
* l#KcmOz
* @author )=[\Yf K
*/ T(D6'm:X
public class CountCache { @(sz "
public static LinkedList list=new LinkedList(); lmzHE8MUNu
/** Creates a new instance of CountCache */ Q"XDxa'7"
public CountCache() {} kg7F8($
public static void add(CountBean cb){ w*VN=
if(cb!=null){ *OG<+#*\_?
list.add(cb); NZB*;U~t
} /grTOf&
} f,TW|Y'{g
} sN[}B{+
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CountControl.java ^Spu/55_
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/* c| ^I}
* CountThread.java F]
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* '@t$3
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* Created on 2007年1月1日, 下午4:57 F}_b7|^
* ;'n%\*+fHH
* To change this template, choose Tools | Options and locate the template under =GX5T(P8k
* the Source Creation and Management node. Right-click the template and choose +#FqC/`l
* Open. You can then make changes to the template in the Source Editor. j 2ag
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*/ xaMDec V
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package com.tot.count; hJEd7{n
import tot.db.DBUtils; *4U_MM#rX
import java.sql.*; gZ,h95'
/** odhS0+d^
* g-sNYd%?a
* @author /4an@5.\C
*/ p3=Py7iz
public class CountControl{ v1OVrk>s>
private static long lastExecuteTime=0;//上次更新时间 fvC,P#z'|
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Ss>pNH@c
/** Creates a new instance of CountThread */ J?8Mo=UZz
public CountControl() {} BIWe Hx
public synchronized void executeUpdate(){ d+q],\"R
Connection conn=null; W@T\i2r$z
PreparedStatement ps=null; {cXr!N^K
try{ &>JP.//spi
conn = DBUtils.getConnection(); |(>`qL{|
conn.setAutoCommit(false); QoZV6
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); lmeTW0U@9(
for(int i=0;i<CountCache.list.size();i++){ BiYxI{V FD
CountBean cb=(CountBean)CountCache.list.getFirst(); b)d;eS
CountCache.list.removeFirst(); BDI|z/~&
ps.setInt(1, cb.getCountId()); [H}>
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ps.executeUpdate();⑴ zZ=SAjT QP
//ps.addBatch();⑵ :<J7 g`f
} ^9Pr`\
//int [] counts = ps.executeBatch();⑶ m)Plv+R}
conn.commit(); fqgp{(`@>
}catch(Exception e){ 6gV*G
e.printStackTrace(); #r'MfTr
} finally{ &b} \).5E
try{ uHg q"e
if(ps!=null) { a{nR:zPE
ps.clearParameters(); ` 2W^Ui,4
ps.close(); M =^d
ps=null; E_ns4k#uG
} pm6#azQ
}catch(SQLException e){} p) 8S]p]
DBUtils.closeConnection(conn); s;VW
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} r2=@1=?8
} )5}<@Ql
public long getLast(){ V`I4"}M1
return lastExecuteTime; 7}kJp%-
} ! ?g+'OM
public void run(){ ix!xLm9\
long now = System.currentTimeMillis(); m/=nz.
if ((now - lastExecuteTime) > executeSep) { ~>CvZ7K
//System.out.print("lastExecuteTime:"+lastExecuteTime); G}nJ3
//System.out.print(" now:"+now+"\n"); lFzVd
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); =1IK"BA2?
lastExecuteTime=now; }DhqzKl
executeUpdate(); sW]_Ky.]
} m;@q('O
else{ :PO./IBX
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =
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} 6("_}9ZOc
} `Lr], >aG
} 6
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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 n28JWkK8
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类写好了,下面是在JSP中如下调用。 rwP#Yj[BK+
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<% w(oK
CountBean cb=new CountBean(); WNyW1?"
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); [}L~zn6>?a
CountCache.add(cb); jK w
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out.print(CountCache.list.size()+"<br>"); G2`z?);1b
CountControl c=new CountControl(); ~5KcbGD~
c.run(); `c
out.print(CountCache.list.size()+"<br>"); y!FO
%>