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: 5@QJ+@j|
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CountBean.java g[G+s4Nv
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/* "w7{,HP
* CountData.java 5Z;iK(>IX
* v']Tusmg
* Created on 2007年1月1日, 下午4:44
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*
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* To change this template, choose Tools | Options and locate the template under }H#C<:A
* the Source Creation and Management node. Right-click the template and choose _uXb 9
* Open. You can then make changes to the template in the Source Editor. C b4.N8
*/ r+=%Ag
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package com.tot.count; ?)NgODU
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/** ^8.s"4{
* h`i*~${yg
* @author n4XEyCrD
*/ ;t~Y>,
public class CountBean { SfSWjq
private String countType; #,[z}fq
int countId; hTc
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/** Creates a new instance of CountData */ g"{`g6(+
public CountBean() {} mzO5&h7
public void setCountType(String countTypes){ CwjKz*'[g
this.countType=countTypes; i[Qq,MmC
} xe"A;6H
public void setCountId(int countIds){ !LR9}Xon
this.countId=countIds; JU Xo3D~
} dzk1 !yy
public String getCountType(){ /07iQcT(
return countType; t
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} `}:pUf
public int getCountId(){
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return countId; -6W$@,K
} P(oGNKAS
} 4V<.:.k
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CountCache.java ppuJC'GW
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/* qrHCr:~
* CountCache.java A&N$=9.N1
* GvzaLEo
* Created on 2007年1月1日, 下午5:01 5Vc~yMz
* 0VnRtLnqI
* To change this template, choose Tools | Options and locate the template under Skl:~'W.&|
* the Source Creation and Management node. Right-click the template and choose \E
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* Open. You can then make changes to the template in the Source Editor. 8\F|{vt#
*/ L,yq'>*5s
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package com.tot.count; U(+%iD60i
import java.util.*; g'+2bQ
/** zYxA#TZL
* BN&eU'Dl]
* @author ! FVD_8
*/ _BEDQb{"|
public class CountCache { x.9[c m-!
public static LinkedList list=new LinkedList(); yxtfyf|9 '
/** Creates a new instance of CountCache */ I!"/ I8Y
public CountCache() {} 6&"*{E
public static void add(CountBean cb){ i"0*)$
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if(cb!=null){ |w"G4J6ha
list.add(cb); =}"P;4:
} a8YFH$Xh
} !a4`SjOgu
} naiQ$uq0
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CountControl.java U#x`u|L&6
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/* zh{I;~syh
* CountThread.java # uy^AC$
* _Tf
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* Created on 2007年1月1日, 下午4:57 \#v(f2jPF
* J8B0H1
* To change this template, choose Tools | Options and locate the template under DaBy<pGb?
* the Source Creation and Management node. Right-click the template and choose ol1J1Zg
* Open. You can then make changes to the template in the Source Editor. QYj*|p^x
*/ Y
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package com.tot.count; &lo<sbd.
import tot.db.DBUtils; HHerL%/
import java.sql.*; g) ofAG2
/** SmS6B5j\R
* \j<aFOT(
* @author : sG/
*/ ujn7DBE"
public class CountControl{ 6P
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private static long lastExecuteTime=0;//上次更新时间 a$EudD#+
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 y: ]
/** Creates a new instance of CountThread */ |.b&\
public CountControl() {} )xL_jSyh
public synchronized void executeUpdate(){ tb>Q#QB&u
Connection conn=null; g,G{%dGsk
PreparedStatement ps=null; |2GrOM&S
try{ iA|n\a~ny,
conn = DBUtils.getConnection(); hh$i1n
conn.setAutoCommit(false); Nx zAlu
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 24po}nrO
for(int i=0;i<CountCache.list.size();i++){ % EYh*g{G
CountBean cb=(CountBean)CountCache.list.getFirst(); g W?Hd/
CountCache.list.removeFirst(); g7w#;E
ps.setInt(1, cb.getCountId()); o4^#W;%w
ps.executeUpdate();⑴ pJ
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//ps.addBatch();⑵ q&&uX-ez5W
} ,g 1~4,hqQ
//int [] counts = ps.executeBatch();⑶ N3V4Mpf
conn.commit(); ]M 2n%9
}catch(Exception e){ QO>)ug+
e.printStackTrace(); _7R6%^
} finally{ /IG3>|R
try{ np\*r|U
if(ps!=null) { #'m#Q6`
ps.clearParameters(); [U$`nnp
ps.close(); 3t5WwrNh
ps=null; 3*F|`js"
} K<k\A@rv8H
}catch(SQLException e){} ~iIFe+6
DBUtils.closeConnection(conn); K#N5S]2yb
} -dw/wHf"
} ^Ge|tBMoKE
public long getLast(){ 5! ]T%.rM
return lastExecuteTime; P
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} 8} X>u2t
public void run(){ ?'>[nm
long now = System.currentTimeMillis(); <J]N E|:
if ((now - lastExecuteTime) > executeSep) { ,!^g8zO
//System.out.print("lastExecuteTime:"+lastExecuteTime); MIu'OJ"z~
//System.out.print(" now:"+now+"\n"); R0yp9icS
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); _$mS=G(
lastExecuteTime=now; ]'vAeC6{
executeUpdate(); k#2b3}(,
} `uc`vkVZ
else{ #UnGU,J
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); QZ5%nJme_
} FC4hvO(/m
} PkOtg[Z
} ZC &~InN
//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 9? |m ^
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类写好了,下面是在JSP中如下调用。 h2aO-y>K
?#:!!.I:
<% cr!s q.)s
CountBean cb=new CountBean(); m;<5QK8f
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); "^t;V+Io
CountCache.add(cb); "77l~3
out.print(CountCache.list.size()+"<br>"); 2bf#L?5g/
CountControl c=new CountControl(); Ut(BQM>U+$
c.run(); S+pm@~xe
out.print(CountCache.list.size()+"<br>"); =]L#v2@
%>