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: Z3dd9m#.]
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CountBean.java 9K|lU:,
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/* N6;Z\\&0^q
* CountData.java j,XKu5w)Oi
* {rZ"cUm
* Created on 2007年1月1日, 下午4:44 WIm7p1U#V
* +QX>:z
* To change this template, choose Tools | Options and locate the template under y~7lug
* the Source Creation and Management node. Right-click the template and choose TpgBS4q
* Open. You can then make changes to the template in the Source Editor. &pm{7nH
*/ ` qTY
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package com.tot.count; m+vEs,W.
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/** Ao T 7sy7
* L])w-
* @author jhv1 D'>6
*/ cqx1NWlY
public class CountBean { }=a4uCE
private String countType; `Ny8u")=
int countId; 1 1CJT
/** Creates a new instance of CountData */ s? k[_|)!
public CountBean() {} "44?n <1
public void setCountType(String countTypes){ &J$5+"/;X
this.countType=countTypes;
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} "ux]kfoT
public void setCountId(int countIds){ AvZ) 1(
this.countId=countIds; {R;M`EU>
} yU,xcq~l
public String getCountType(){ p'~5[JR:
return countType; 31& .Lnq
} u9w&q^0dqG
public int getCountId(){ Kdu\`c-lB
return countId; 8F`
} *K'ej4"u
} P*`xiTA
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CountCache.java .E#Sm?gK
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/* 'V#ew\
* CountCache.java N?0y<S ?!
* C+XZDY(=Z
* Created on 2007年1月1日, 下午5:01 4rG 7\
* 1m;*fs
* To change this template, choose Tools | Options and locate the template under ,hLSRj{
* the Source Creation and Management node. Right-click the template and choose V(LFH9.Mp
* Open. You can then make changes to the template in the Source Editor. .A)Un/k7
*/ v&2@<I>
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package com.tot.count; *`Xx _
import java.util.*; }Y`<(V5:
/** bpa
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* ]31XX=
* @author Xe;(y "pR
*/ 8Ql'(5|T
public class CountCache { bs EpET
public static LinkedList list=new LinkedList(); W'h0Zg
/** Creates a new instance of CountCache */ S.|kg2
public CountCache() {} AYIz;BmWy
public static void add(CountBean cb){ <[:7#Yo
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if(cb!=null){ 2pa3}6P+
list.add(cb); PlH`(n#
} $'YKB8C
} Tw;qY
} WwtE=od
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CountControl.java \&&(ytL
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/* 9,f<Nb(\
* CountThread.java 7G(f1Y
* V}fKV6 v9
* Created on 2007年1月1日, 下午4:57 > '
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* AAq=,=:R<
* To change this template, choose Tools | Options and locate the template under wZ8 MhE
* the Source Creation and Management node. Right-click the template and choose kN|5
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* Open. You can then make changes to the template in the Source Editor. ]/Yy-T#@
*/ dyiEK)$h
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package com.tot.count; X2dc\v.x
import tot.db.DBUtils; ^y0C5Bl;
import java.sql.*; [Cj)@OC
/** ?7MwTi8{F
* 4UD=Y?zK
* @author U?mf^'RE
*/ a,*p_:~i
public class CountControl{ %m{.l4/!O
private static long lastExecuteTime=0;//上次更新时间 D`:d'ow~KQ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 6$s0-{^
/** Creates a new instance of CountThread */ D&l,SD
public CountControl() {} ()M@3={R
public synchronized void executeUpdate(){
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Connection conn=null; o.3YM.B#
PreparedStatement ps=null; ]]=fA 4(
try{ |4S?>e
conn = DBUtils.getConnection(); !Nl.Vb
conn.setAutoCommit(false); M*|VLOo=v
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); }"?nU4q;S
for(int i=0;i<CountCache.list.size();i++){ Zxc7nLKF~
CountBean cb=(CountBean)CountCache.list.getFirst(); (s$u_aq77
CountCache.list.removeFirst(); ? x"HX|n
ps.setInt(1, cb.getCountId()); !@<@QG-
ps.executeUpdate();⑴ [Z5[~gP3
//ps.addBatch();⑵ %aH$Tb%`hc
} ] @)!:<+
//int [] counts = ps.executeBatch();⑶ MziZN^(
conn.commit(); Np<s[dQ
}catch(Exception e){ ur<eew@8@i
e.printStackTrace(); 6Z&u
} finally{ ]osx.
try{ ]TBtLU3
if(ps!=null) { o9Txo
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ps.clearParameters(); qwF*(pTHq
ps.close(); S2&9#6
ps=null; WVWS7N\
} +an^e'
}catch(SQLException e){} ^{*f3m/
DBUtils.closeConnection(conn); 2Za,4'
} w;c#drY7S
} E
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public long getLast(){ z_Wm
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return lastExecuteTime; B3dA%\'
} [.j]V-61
public void run(){ #PslrA.
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long now = System.currentTimeMillis(); ]A]Ft!`6z
if ((now - lastExecuteTime) > executeSep) { n^AP"1l8?0
//System.out.print("lastExecuteTime:"+lastExecuteTime); 7"F|6JP"$c
//System.out.print(" now:"+now+"\n"); @q+cmJKv
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); j&dx[4|m:h
lastExecuteTime=now; vS$oT]-hKE
executeUpdate(); &{zwM |Q@?
} &IRA=nJ
else{ ZUXse1,
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); s~LZOPN
} Z .bit_(
} >v1 y 0zx
} }KA-t}8
//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 T)(e!Xz
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类写好了,下面是在JSP中如下调用。 Any Zi'
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<% eu}Fd@GO
CountBean cb=new CountBean(); B;GxfYj
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); L19MP
CountCache.add(cb); x2C/L
out.print(CountCache.list.size()+"<br>"); =t3vbV
CountControl c=new CountControl(); N.0HfYf
c.run(); Ht|",1yr+
out.print(CountCache.list.size()+"<br>"); YX ;n6~y
%>