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: 2C"i2/NH'
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CountBean.java v'`qn
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/* d{WOO)j
* CountData.java tmoclK-
* ZX+0{E8a
* Created on 2007年1月1日, 下午4:44 cF9ZnT.
* 1"<{_&d1
* To change this template, choose Tools | Options and locate the template under a|dgK+[
* the Source Creation and Management node. Right-click the template and choose gm:Y@6W
* Open. You can then make changes to the template in the Source Editor. vgNrHq&2q
*/ z+0#H39 &
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package com.tot.count; X`E}2|q'
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/** CAA3-"Cwi
* Qe9}%k6@E
* @author -4J.YF>
*/ n0':6*oGW
public class CountBean { KeyHxU=?
private String countType; YWANBM(v+
int countId; cI7a TLC"s
/** Creates a new instance of CountData */ "6%qi qt
public CountBean() {} -
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public void setCountType(String countTypes){ 8_rd1:t5
this.countType=countTypes; ;'!h(H
} ST0|2)Lh"
public void setCountId(int countIds){ JV2[jo}0N
this.countId=countIds; 6l"4F6
} 0@&;JMh6<
public String getCountType(){ rb>2l3g*
return countType; [[4!b E
}
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public int getCountId(){ sv\=/F@n
return countId; q.ppYXJUXi
} WUx2CK2N
} UG]5Dxk
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CountCache.java W3MH8z
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/* r)G)i;;~*
* CountCache.java `V[ hE
r|
* +sd':vE
* Created on 2007年1月1日, 下午5:01 Tkh?F5l
* kRiZ6mn
* To change this template, choose Tools | Options and locate the template under $yFR{_]
* the Source Creation and Management node. Right-click the template and choose 7:C2xC
* Open. You can then make changes to the template in the Source Editor. . Eb=KG
*/ C*Y0GfW=
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package com.tot.count; HhTD/
import java.util.*; g*%o%Lv
/** s*kSl:T@O
* V#DNcF~v]f
* @author yyjgPbLN=
*/ '&y+,2?;Y[
public class CountCache { l_&T)Ei
public static LinkedList list=new LinkedList();
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/** Creates a new instance of CountCache */ 4}^\&K&t{
public CountCache() {} 73E[O5?b
public static void add(CountBean cb){ !wjD6NK
if(cb!=null){ RJOyPZ]
list.add(cb); [sG!|@r
} _M[T8 "e(
} ^0"[l {
} @IBU{{
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CountControl.java kc"SUiy/
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/* |+Ub3<b[]
* CountThread.java }?%5Ae7l,
* R<8!lQ4s
* Created on 2007年1月1日, 下午4:57 K1fnHpK
* 6\/(TW&
* To change this template, choose Tools | Options and locate the template under \;Q:a
/ur9
* the Source Creation and Management node. Right-click the template and choose 3C;nC?]K
* Open. You can then make changes to the template in the Source Editor. C5'#0}6i
*/ _i1x\Z~
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package com.tot.count; -$kAWP8P4
import tot.db.DBUtils; l0{R`G,
import java.sql.*; K(p6P3Z
/** {o.i\"x;
* t>(}LV.
* @author M!b"c4|<
*/ 1mz72K
public class CountControl{ +,ojlTVlt
private static long lastExecuteTime=0;//上次更新时间 $r=tOD4;
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 <>6 DPHg~
/** Creates a new instance of CountThread */ $<s
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public CountControl() {} HFrwf{J
public synchronized void executeUpdate(){ y8=H+Y
Connection conn=null; AtW<e;!0te
PreparedStatement ps=null; .Zv uhOn^
try{ la[>C:8IG
conn = DBUtils.getConnection(); 5IiZnGu
conn.setAutoCommit(false); Mi&jl_&
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 4z> SI\Ss
for(int i=0;i<CountCache.list.size();i++){ X=i",5;
CountBean cb=(CountBean)CountCache.list.getFirst(); E >lW'
CountCache.list.removeFirst(); %w3"B,k'9D
ps.setInt(1, cb.getCountId()); V'&`JZK6
ps.executeUpdate();⑴ 5]yby"Z?}
//ps.addBatch();⑵ 0Wc8\c
} #=\ nuT'oy
//int [] counts = ps.executeBatch();⑶ lr_c
conn.commit(); t bEJyA
}catch(Exception e){
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e.printStackTrace(); &F#K=R| .j
} finally{ C(kIj
try{ s+OXT4>+
if(ps!=null) { ]:r6
ps.clearParameters(); ~V6wcXd
ps.close(); w_]`)$9
ps=null; @j|=M7B
} ]ovb!X_
}catch(SQLException e){} #1oyRD-
DBUtils.closeConnection(conn); %d"d<pvx
} .DG`~Fpk
} R /0zB
public long getLast(){ =/SBZLR(9
return lastExecuteTime; 's_[#a;Vp
} K#!c<Li#
public void run(){ 'sT7t&v~
long now = System.currentTimeMillis(); Ny2. C?2
if ((now - lastExecuteTime) > executeSep) { K@>($BX]
//System.out.print("lastExecuteTime:"+lastExecuteTime); \qj(`0HG
//System.out.print(" now:"+now+"\n"); *\PCMl
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); <Po$|$_~
lastExecuteTime=now; -#<AbT
executeUpdate(); :ExCGS[
} AMf{E
else{ ?3=y]Vb+
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); iininITOS{
} yeqHeZ
} ]CxDm
} eNc>^:&y*
//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 5e}adHjM
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类写好了,下面是在JSP中如下调用。 '4"c#kCKL
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<% )wyC8` &-
CountBean cb=new CountBean(); 8$`$24Wx
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 5/YGu=,
CountCache.add(cb); z,xGjSP
out.print(CountCache.list.size()+"<br>");
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CountControl c=new CountControl(); JBk >|q"
c.run(); k$3Iv"gbx
out.print(CountCache.list.size()+"<br>"); =M`Xu#eRk
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