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: yJ(ITJE_Z
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CountBean.java Nig)!4CG
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/* !3"Hn
* CountData.java dAaxbP|
* uK[gI6M
* Created on 2007年1月1日, 下午4:44 2W/*1K}
* l5U ^lc
* To change this template, choose Tools | Options and locate the template under r90R~'5x9
* the Source Creation and Management node. Right-click the template and choose qIO)<5\[%d
* Open. You can then make changes to the template in the Source Editor. ;F/s!bupCM
*/ xoQqku"vn
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package com.tot.count; 4EhWK;ra
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/** |jKFk.M
* '=UsN_@
* @author n,p \~Tu,
*/ ^>s{o5H&
public class CountBean { hgdr\
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private String countType; ?~; q r
int countId; |e2s{J2
/** Creates a new instance of CountData */ fh&Q(:ZU
public CountBean() {} C1-Jj_XQ.
public void setCountType(String countTypes){ nd h\+7
this.countType=countTypes; pQ`S%]k.<
} 't475?bY
public void setCountId(int countIds){ I.1(qbPkF+
this.countId=countIds; @[;$R@M_3
} OuB[[L
public String getCountType(){ 0}\8,U
return countType; T6=~vOzTJ
} TEbE-h0)]
public int getCountId(){ hNF, sA
return countId; sv#/ 78 ~|
} v2>Dn=V
} gv,%5r0YOw
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CountCache.java 7K/t>QrBtU
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/* }G<A$*L1
* CountCache.java aY%{?8PsB
* #o(@S{(NZ
* Created on 2007年1月1日, 下午5:01 +F^X1
* /$UWTq/C7
* To change this template, choose Tools | Options and locate the template under l^v,X%{Iz
* the Source Creation and Management node. Right-click the template and choose lH>6;sE
* Open. You can then make changes to the template in the Source Editor. #3-hE
*/ C+-sf
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package com.tot.count; n:JG+1I
import java.util.*; i]0$7s9!
/** wtfM}MW\
* D!bi>]Yd
* @author <-!'V,c
*/ N||s#
public class CountCache { [Ib17#74
public static LinkedList list=new LinkedList(); u6/;=]0
/** Creates a new instance of CountCache */ s1zkkLw`*
public CountCache() {} :LD+B1$y
public static void add(CountBean cb){ X Qj+]-m
if(cb!=null){ wKy4Ic+RV
list.add(cb); H&0S
} D 6F/9|
} ,>I_2mc
} _;k))K^
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CountControl.java }Q{4G
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/* o%v,6yv
* CountThread.java `Ro>?H
* |d_ rK2
* Created on 2007年1月1日, 下午4:57 2Zi&=Zj"
* [Mlmn$it
* To change this template, choose Tools | Options and locate the template under 4,ewp coC%
* the Source Creation and Management node. Right-click the template and choose s;:quM
* Open. You can then make changes to the template in the Source Editor. 4?~Ei[KgQn
*/ xf8.PqVNo
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package com.tot.count; &3Mps[u:h
import tot.db.DBUtils; &sS]h|2Z5
import java.sql.*; Y\{lQMCy
/** Wr.~Ns<
* rXnG"A
* @author GC~N$!*
*/ ,CnUQx0
public class CountControl{ /Pa<I^-#
private static long lastExecuteTime=0;//上次更新时间 90+Hv:wF
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 V;]U]
/** Creates a new instance of CountThread */ GI#TMFz3
public CountControl() {} jp-]];:aPJ
public synchronized void executeUpdate(){ Ji:0J},m
Connection conn=null; }/Y)^
PreparedStatement ps=null; %gXNWxv
try{ Y^uYc}
conn = DBUtils.getConnection(); 8j!(*'J.
conn.setAutoCommit(false); IeJ@G)
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); "C [uz&
for(int i=0;i<CountCache.list.size();i++){ ]\:l><
CountBean cb=(CountBean)CountCache.list.getFirst(); PX,fg5s\b
CountCache.list.removeFirst(); Re'Ek
ps.setInt(1, cb.getCountId()); '>|5
ps.executeUpdate();⑴ c# WIB 4
//ps.addBatch();⑵ O}"fhMk
} 4(\7Or(''
//int [] counts = ps.executeBatch();⑶ |-VbJd
conn.commit(); *wJ'Z4_5F
}catch(Exception e){ ij1g2^],4
e.printStackTrace(); 7.xJ:r|
} finally{ R)qK{wq(1E
try{ DZ0\pp?S
if(ps!=null) { &E8fd/s=k
ps.clearParameters(); Hxd^oE
ps.close(); %b`B.A
ps=null; 0qD.OF)8
} ^->vUf7PX
}catch(SQLException e){} !<MW*7P=
DBUtils.closeConnection(conn); ?C9>bKo*2H
} }#U3vMx(
} dLTA21b#
public long getLast(){ lpeo^Y}N
return lastExecuteTime; >.#tNFAs
} E{6X-C[)v
public void run(){ }sS1p6z
long now = System.currentTimeMillis(); WjMP]ND#c
if ((now - lastExecuteTime) > executeSep) { f= l*+QY8f
//System.out.print("lastExecuteTime:"+lastExecuteTime); U*em)/9
//System.out.print(" now:"+now+"\n"); 78<QNlKn
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); &0S/]E`_M
lastExecuteTime=now; %uhhQ<zs%
executeUpdate(); RlTVx:
} )ur&Mnmm
else{ X+XbIbUuL
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); MBH/,Yd
} &b&o];a
} y2Z1B2E%f
} L\asrdL?=
//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 "n=Ih_J
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类写好了,下面是在JSP中如下调用。 mPo] .z
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<%
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CountBean cb=new CountBean(); %uLyL4*L(p
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 9CTvG zkw
CountCache.add(cb); $U/_8^6B0
out.print(CountCache.list.size()+"<br>"); 4lfJc9J
CountControl c=new CountControl(); },LW@Z}
c.run(); K1>(Fs$
out.print(CountCache.list.size()+"<br>"); k|T0Bly3P
%>