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: (&
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CountBean.java `5q`ibyPI
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/* &4{%3 w_/
* CountData.java d(]LRIn~1
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* Created on 2007年1月1日, 下午4:44 !gT6So
* -u8@ .
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose qqkZbsN
* Open. You can then make changes to the template in the Source Editor. ;M'R/JlUN
*/ 8#kFS@
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package com.tot.count; Z?v9ub~%
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/** y()#FRp7
* .Hgiru&
* @author HP?e?3.T
*/ A:p0p^*
public class CountBean { VQ}=7oe%q
private String countType; ,'ndQ{\9
int countId; XeZv%` ?
/** Creates a new instance of CountData */ ?G8 D6
public CountBean() {} [{Y$]3?}
public void setCountType(String countTypes){ KNK0w 5
this.countType=countTypes; ("{AY?{{
} 1TbKnmTx
public void setCountId(int countIds){ Xf#;GYO|2
this.countId=countIds; LW2Sko?Yo
} 6\E |`
public String getCountType(){ />$)o7U`+
return countType; Y
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} _~_Hup
public int getCountId(){ !XtbZ-
return countId; ~gX@2!D5k
} jMw;`yh
} (:hPT-1
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CountCache.java ~u3I=b
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/* f'#7i@Je
* CountCache.java O %)+ w
* wefQmRK
* Created on 2007年1月1日, 下午5:01 1p{\jCi,2
* ^&cI+xZ2Y
* To change this template, choose Tools | Options and locate the template under >\>HRyt%
* the Source Creation and Management node. Right-click the template and choose yV`!Fq 1k
* Open. You can then make changes to the template in the Source Editor. DU[UGJg
*/ D|+H!f{k
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package com.tot.count; E^|b3G6T
import java.util.*; h,\_F#hi
/** c[j3_fn1]
* ,:,c
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* @author 9OTw6
*/ 0J_Np
public class CountCache { #s]]\
public static LinkedList list=new LinkedList(); #}B~V3UD
/** Creates a new instance of CountCache */ b%v1]a[
public CountCache() {} Q2Q`g`* O:
public static void add(CountBean cb){ }>p)|YT"/
if(cb!=null){
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list.add(cb); \l]jX:
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} f[dwu39k
} ]Mtb~^joG
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CountControl.java <rCl
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/* _@d.wfM
* CountThread.java v3hNvcMpf
* *1>XlVx,
* Created on 2007年1月1日, 下午4:57 a?D\H5TF-
* %r|fuwwJO
* To change this template, choose Tools | Options and locate the template under `N|WCiBV.
* the Source Creation and Management node. Right-click the template and choose );$~/H4
* Open. You can then make changes to the template in the Source Editor. *emUQ/uvf
*/ vK$T$SL
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package com.tot.count; 38 B\ \
import tot.db.DBUtils; F1/f:<}
import java.sql.*; Oz n7C?\*
/** :v&GAs6H
* _b#9^2o
* @author FiIN\
*/ (zTr/
public class CountControl{ u}u2{pO!
private static long lastExecuteTime=0;//上次更新时间 3K54:
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 9{>m04888
/** Creates a new instance of CountThread */ Nf$Y-v?i
public CountControl() {} Q<78<#I
public synchronized void executeUpdate(){ gp$+Qd
Connection conn=null; .$?s :t
PreparedStatement ps=null; *D|6g|Hb
try{ VT+GmS
conn = DBUtils.getConnection(); i{%~&!
conn.setAutoCommit(false); f\|33)k
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); GR|Vwxs<@P
for(int i=0;i<CountCache.list.size();i++){ F.T~txQ~u
CountBean cb=(CountBean)CountCache.list.getFirst(); Ebp8})P/~
CountCache.list.removeFirst(); )"f>cYF
ps.setInt(1, cb.getCountId()); v
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ps.executeUpdate();⑴ ,Cx5(
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//ps.addBatch();⑵ -/FCd(
} <Q szmE
//int [] counts = ps.executeBatch();⑶ fHwh6|
conn.commit(); ;9;.!4g/T
}catch(Exception e){ [KCh,'&
e.printStackTrace(); W_M]fjL.
} finally{ EJL45R>
try{ iVmf/N@A|
if(ps!=null) { fzw6VGTf
ps.clearParameters(); tCA |sN
ps.close(); {_Ke'"
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ps=null; d5bj$oH
} :*4yR46
}catch(SQLException e){} /V3*[
DBUtils.closeConnection(conn); 'kYV}rq;l
} Wp>W?'`
} @^`f~0#:
public long getLast(){ @.MM-
return lastExecuteTime; /i$&89yod
} NO6. qWl
public void run(){ q9!5J2P
long now = System.currentTimeMillis(); VEz&TPu
if ((now - lastExecuteTime) > executeSep) { o5zth^p[
//System.out.print("lastExecuteTime:"+lastExecuteTime); {!E<hQ2<$9
//System.out.print(" now:"+now+"\n"); )zr/9aV
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); UpB7hA
lastExecuteTime=now; ,=K!Y TeVl
executeUpdate(); M*0&3Y
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} J }JT%SW
else{ 1R,n[`}h
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); %OW[rbE.
} MR8-xO'w
} x}F.<`
} {V:?r
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 b_][Jye&P
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类写好了,下面是在JSP中如下调用。 ^\_`0%`>
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<% ]c$%;!ZE
CountBean cb=new CountBean(); 6bfk4k
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 8/=[mYn`-
CountCache.add(cb); ~r@'k UXKK
out.print(CountCache.list.size()+"<br>"); B?TAS
CountControl c=new CountControl(); Nz$OD_]
c.run(); U6_1L,W
out.print(CountCache.list.size()+"<br>"); r+
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