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: 2jsw"aHW
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CountBean.java U'UQ|%5f
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/* qjAWeS/
* CountData.java /N>e&e[35\
* [+*$\
* Created on 2007年1月1日, 下午4:44 /WV7gO&L1
* >R{qESmP=
* To change this template, choose Tools | Options and locate the template under LLWB
* the Source Creation and Management node. Right-click the template and choose AB Xl
* Open. You can then make changes to the template in the Source Editor. x6afI<dm
*/ `dMqe\o%!
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package com.tot.count; ;g_>
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/** v1k)hFjPK
* ]{
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* @author 0,s$T2
*/ {*ZY(6^
public class CountBean { 7J28JK
private String countType; aKUS5jDu
int countId; \?j E#^
/** Creates a new instance of CountData */ XS0xLt=
public CountBean() {} w:Jrmx
public void setCountType(String countTypes){ Ed0I WPx
this.countType=countTypes; 9jp:k><\(c
} @\oz4^
public void setCountId(int countIds){ v]%WH~>
this.countId=countIds; dLsn\m>
} xCzebG["
public String getCountType(){ b96%")
return countType; B()/.w?A
} fW`&'!
public int getCountId(){ 1Kvx1p
return countId; i`/+,<
} b5m=7;u*h
} .,~(%#Wl$
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CountCache.java 3Y)PU=
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/* aw?=hXR!
* CountCache.java =z{JgD/
* +5.t. d
* Created on 2007年1月1日, 下午5:01 :0K8h
* E|YdcS
* To change this template, choose Tools | Options and locate the template under bsxTqJ
* the Source Creation and Management node. Right-click the template and choose #>Y'sd5'A
* Open. You can then make changes to the template in the Source Editor. vhvdKD
*/ 6*l^1;U
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package com.tot.count; gef6pfV
import java.util.*; -16K7yk
/** 2eeQ@]Wj[Z
* kVI#(uO
* @author E@a3~a
*/ S1 _6C:^k
public class CountCache { /2{5;
public static LinkedList list=new LinkedList(); .yT8NTu~0j
/** Creates a new instance of CountCache */ mD:IO
public CountCache() {} FtufuL?JS
public static void add(CountBean cb){ a"/#+=[
if(cb!=null){ [md u!!*
list.add(cb); ]maYUKqv}'
} 5#3W5z
}
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} Vh3Ijn
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CountControl.java +,:^5{9{
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/* #jpoHvth
* CountThread.java c[}(OH
* Mh(]3\
* Created on 2007年1月1日, 下午4:57 H?}[r)|(3i
* P+MA*:
* To change this template, choose Tools | Options and locate the template under A392=:N+Q
* the Source Creation and Management node. Right-click the template and choose nI*/Mhx
* Open. You can then make changes to the template in the Source Editor. FZd.L6q
*/ Mcw4!{l`
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package com.tot.count; , "jbq~
import tot.db.DBUtils; pqvOJ#?Q}=
import java.sql.*; gIR^)m
/** r
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* MyJ4><oG
* @author z|G9,:9
*/ OQ :dJe6
public class CountControl{ j9qREf9)
private static long lastExecuteTime=0;//上次更新时间 f:zFFpP.j@
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ,3v+PIcMM+
/** Creates a new instance of CountThread */ s#h8%['
public CountControl() {} Q|}aR:4
public synchronized void executeUpdate(){ 53 QfTP
Connection conn=null; {^{p,9
PreparedStatement ps=null; T0Yiayt
try{ jk\ dG16
conn = DBUtils.getConnection(); :H.
conn.setAutoCommit(false); ggtDN{t
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); c~A4gtB=
for(int i=0;i<CountCache.list.size();i++){ "HD+rmUEH
CountBean cb=(CountBean)CountCache.list.getFirst(); sDqe(x}a
CountCache.list.removeFirst(); {qKxz9.y
ps.setInt(1, cb.getCountId()); eRbGZYrJ
ps.executeUpdate();⑴ ?%Rw(E
//ps.addBatch();⑵
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} qo+N,x9o
//int [] counts = ps.executeBatch();⑶ &m3.h!dq
conn.commit(); BE&B}LfvfO
}catch(Exception e){ Xqp|VbDca
e.printStackTrace(); JXiZB
8}
} finally{ {P8[X@Lu
try{ n<Svwa}
if(ps!=null) { wI M{pK
ps.clearParameters(); {vaaFs
ps.close(); ,~ ?'Ef80
ps=null; O<9~Kgd8h
} m,3er*t{
}catch(SQLException e){} <0|9Tn2O
DBUtils.closeConnection(conn); z!=P@b
} _|<d5TI
} J
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public long getLast(){ Y9SGRV(
return lastExecuteTime; HQ!Xj.y
} puSLqouTM
public void run(){ fQWIw
long now = System.currentTimeMillis(); < (RC|?
if ((now - lastExecuteTime) > executeSep) { x+? 9C
//System.out.print("lastExecuteTime:"+lastExecuteTime); 1rw0sAuGy
//System.out.print(" now:"+now+"\n"); W]<$0
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); K.tlo^#^B[
lastExecuteTime=now; "Z,q?F c
executeUpdate(); )/4(e?%=
} LCXO>MXN
else{ ZZ/cq:3$ P
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); @#+jMV$g
} p\wJD1s
} lM\LN^f5*
} zHB_{(o7
//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 f<i7@%
Rg29
类写好了,下面是在JSP中如下调用。 F9c`({6k
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<% O|kKwadC
CountBean cb=new CountBean(); JL}\*
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); !yjo
CountCache.add(cb); B UUf;Vv
out.print(CountCache.list.size()+"<br>"); 0m[dP
CountControl c=new CountControl(); \a"Ct'
c.run(); u]C`6)>
out.print(CountCache.list.size()+"<br>"); O(2cWQ
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