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: *"%MT:
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CountBean.java #CM^f^*
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/* =}G `i**
* CountData.java w Jb\Q
* 05+uBwH
* Created on 2007年1月1日, 下午4:44 0k];%HV|
* /^d!$v
* To change this template, choose Tools | Options and locate the template under jq4{UW'
* the Source Creation and Management node. Right-click the template and choose ;zbF~5e
* Open. You can then make changes to the template in the Source Editor. 9bDxml1
*/ 'yWv @)
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package com.tot.count; +QqEUf<U*,
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/** $jDp ^ -
* ?2g\y@
* @author CDz-IQi
*/ n-cz xq%n
public class CountBean { Xu1tN9:oE
private String countType; kdWk{ZT^
int countId; x{B%TM-Ey
/** Creates a new instance of CountData */ CpAdE m{
public CountBean() {} )eFq0+6*)
public void setCountType(String countTypes){ _a"\g9{%*
this.countType=countTypes; CENA!WWQ
} C7]K9
public void setCountId(int countIds){ /}]Irj4m
this.countId=countIds; }
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} F?LTWm
public String getCountType(){ 0 w"&9+kV
return countType; 4YVxRZ1[3
} XG5mfKMt+
public int getCountId(){ |!\(eLR9>
return countId; <*Kj7o{Qn
} wec|~Rc-
} 8bB'[gJ]{
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CountCache.java 7[l
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/* ~6nq$( #
* CountCache.java ]i=\5FH e
* >Ic)RPO9
* Created on 2007年1月1日, 下午5:01 az (u=}
* <%(nF+rQA"
* To change this template, choose Tools | Options and locate the template under F:8cd^d~u
* the Source Creation and Management node. Right-click the template and choose &}1PH%6
* Open. You can then make changes to the template in the Source Editor. Xm7Nr#
*/ HDyus5g
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package com.tot.count; O; qerE?i`
import java.util.*; }5RCks;)*
/** ,R
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*
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* @author J`ia6fy.I
*/ /=x) 9J
public class CountCache { +3
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public static LinkedList list=new LinkedList(); Og`6>?>97
/** Creates a new instance of CountCache */ zL@ZNH
public CountCache() {} (8<U+)[tPy
public static void add(CountBean cb){ 1)aB']K%
if(cb!=null){ :bLLN
list.add(cb); FuNc#n>
} CL*i,9:NR
} +oY[uF
} fjUyx:
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CountControl.java 1{oq8LB
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/* a
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* CountThread.java RZ!-,|"cwL
* sskwJu1
* Created on 2007年1月1日, 下午4:57 (Ck|RojC
* o;XzJ#P
* To change this template, choose Tools | Options and locate the template under JDi|]JY
* the Source Creation and Management node. Right-click the template and choose 9PA\Eo|Yb
* Open. You can then make changes to the template in the Source Editor. F/\w4T
*/ b!Q|0X.?
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package com.tot.count; M@rknq@
import tot.db.DBUtils; +'$=\d^
import java.sql.*; C@` eYi
/** &46h!gW
* .17WF\1HC.
* @author -{i;!XE$SR
*/ 5-Vdq
public class CountControl{ ?Sj3-*/?
private static long lastExecuteTime=0;//上次更新时间 SU.T0>w
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Si#b"ls'
/** Creates a new instance of CountThread */ (~Pb,Q
public CountControl() {} |?CR|xqT
public synchronized void executeUpdate(){ zg!;g`Z@S
Connection conn=null; TOo0rcl
PreparedStatement ps=null; Kb~s'cTxIO
try{ m}] bP
conn = DBUtils.getConnection(); O_#Ag K<A
conn.setAutoCommit(false); LL+ROX^M
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); >A#wvQl7
for(int i=0;i<CountCache.list.size();i++){ u/e-m/
CountBean cb=(CountBean)CountCache.list.getFirst(); [XWY-q#Gg
CountCache.list.removeFirst(); (&4aebkZO
ps.setInt(1, cb.getCountId()); Lrgv:n
ps.executeUpdate();⑴ PsTPGK#S
//ps.addBatch();⑵ +(iM]L$Fw%
} 12*'rU;*
//int [] counts = ps.executeBatch();⑶ AvdxDN
conn.commit(); P
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}catch(Exception e){ ] Cpd`}'
e.printStackTrace(); MP\$_;&xB
} finally{ I"4j152P|
try{ " d3pkY
if(ps!=null) { |:SBkM,
ps.clearParameters(); 1;<J] S$$
ps.close(); T8 k@DS
ps=null; xmxfXW
} )cnB>Qul
}catch(SQLException e){} 5|!x0H;
DBUtils.closeConnection(conn); -o<L%Y<n2
} #(C2KRRiA
} HDUtLUd
public long getLast(){ Ml` f+$
return lastExecuteTime; EOu\7;kE9
} 6CBk,2DswI
public void run(){ LuQ4TT
long now = System.currentTimeMillis(); 1>OfJc(K
if ((now - lastExecuteTime) > executeSep) { [H5TtsQ[
//System.out.print("lastExecuteTime:"+lastExecuteTime); TN}YRXtW+
//System.out.print(" now:"+now+"\n"); t>QAM6[
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6'UtB !gr
lastExecuteTime=now; l/,O9ur-
executeUpdate(); U`_(Lq%5W
} ,.tv#j|A
else{ YB/A0 J
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); T_bk%
} kVk^?F
} 5K13
} 8Czy<}S<G
//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 ;hi+.ng_
#/zPAcV:
类写好了,下面是在JSP中如下调用。 il `O*6-
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<% %pmowo~{
CountBean cb=new CountBean(); 5inmFT?9Z
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Q.Hy"~
CountCache.add(cb); nYG$V)iCb
out.print(CountCache.list.size()+"<br>"); dg/OjiD[P
CountControl c=new CountControl(); 4Y5Q>2D}
c.run(); BRF=TL5Z
out.print(CountCache.list.size()+"<br>"); ',k0_n?t
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