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: G]$.bq[v
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CountBean.java ]9 ArT$
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/* "Q[rM1R
* CountData.java b}C6/zW
* CZ~%qPwDw
* Created on 2007年1月1日, 下午4:44 $3BH82
* p
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* To change this template, choose Tools | Options and locate the template under ?kF_C,k/>N
* the Source Creation and Management node. Right-click the template and choose #cF ?a5
* Open. You can then make changes to the template in the Source Editor. CkHifmc(u-
*/ X`+8rO[
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package com.tot.count; s^QXCmb$8
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/** n6 VX0R
* in[yrqFb7t
* @author :mI[fQ
*/ vz*'1ugaA
public class CountBean { ^(:Z*+X~>
private String countType; m0a <~
int countId; Z2t
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/** Creates a new instance of CountData */ ]i@WZ(
public CountBean() {} kzb%=EI
public void setCountType(String countTypes){ q
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this.countType=countTypes; i+Fk
} ^]_5oFRIj
public void setCountId(int countIds){ /+p]VHP\
this.countId=countIds; jW<aAd
} ?%]?#4bkc
public String getCountType(){ Cbq|<p# #o
return countType; Ed^F_Gg#
} R3<2Z0lqy
public int getCountId(){ >+3tOv3:
return countId; "+BNas^rF
} Cr;d
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} x$WdW+glZ-
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CountCache.java C>0='@LB@r
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/* @0qDhv s
* CountCache.java z"*$ .
* x#0B
"{
* Created on 2007年1月1日, 下午5:01 G#(+p|n
* Ozo)}
* To change this template, choose Tools | Options and locate the template under NW*qw q
* the Source Creation and Management node. Right-click the template and choose Fu/{*4
* Open. You can then make changes to the template in the Source Editor. V!3.MQM
*/ !arTR.b\
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package com.tot.count; zm9_[0
import java.util.*; s(3iGuT
/** Dj$W?dC"^
* y9@DlK
* @author `& (Fy
*/ Ts~)0
public class CountCache { #]_S)_Z-
public static LinkedList list=new LinkedList(); "v9i;Ba>+
/** Creates a new instance of CountCache */ IY=CTFQ8lm
public CountCache() {} H>/LC* 8-
public static void add(CountBean cb){ ~H+W[r}
if(cb!=null){ S}T*g UO
list.add(cb); OlJkyL8|
} zV<vwIUrr
} Dqu][~oQ
} LmA I vEr
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CountControl.java MGGc
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/* .^}
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* CountThread.java 7Hm/g
* "k%B;!We)
* Created on 2007年1月1日, 下午4:57 9"TPAywd
* n;5;D
* To change this template, choose Tools | Options and locate the template under `=B0NC.3
* the Source Creation and Management node. Right-click the template and choose TiF2c#Q*y
* Open. You can then make changes to the template in the Source Editor. ;&9A
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*/ *z{.9z`
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package com.tot.count; )ZP-t!).G#
import tot.db.DBUtils; >aaHN1Ca
import java.sql.*; i H^Gv *
/** HR>
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* ^^{gn3xJ
* @author ,svj(HP$
*/ K#LG7faj
public class CountControl{ RlH~<|XK
private static long lastExecuteTime=0;//上次更新时间 XJ.ERLR.
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ]rs7%$ZW
/** Creates a new instance of CountThread */ H|K}m,g
public CountControl() {} ;%V%6:5
public synchronized void executeUpdate(){ N+[ |"v
Connection conn=null; D]h~\
PreparedStatement ps=null;
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try{ 6}>:sr
conn = DBUtils.getConnection(); !_|rVg.
conn.setAutoCommit(false); k\J 6WT
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 9j6
for(int i=0;i<CountCache.list.size();i++){ > 10pk
CountBean cb=(CountBean)CountCache.list.getFirst(); .vbUv3NI
CountCache.list.removeFirst(); (6WSQqp
ps.setInt(1, cb.getCountId()); S/XkxGZ2
ps.executeUpdate();⑴ Gw;[maM!%`
//ps.addBatch();⑵ !83N.
gN
} KC`~\sYRN]
//int [] counts = ps.executeBatch();⑶ f4k\hUA
conn.commit(); c_33.i"I}
}catch(Exception e){ `PY>p!E
e.printStackTrace(); xlH?J;$
} finally{ tl:+wp7P`
try{ 8O)!{gB
if(ps!=null) { &>Ko}?w
ps.clearParameters(); J6)&b7
ps.close(); mOUIGlv
ps=null; =R>%}5
} #78P_{#!
}catch(SQLException e){} s|1BqoE
DBUtils.closeConnection(conn); 6,C,LT2^(
} Nd"Rt
} ;goR0PN
public long getLast(){ U;_b4S:
return lastExecuteTime; g7|$JevR0
} r:&"#F
public void run(){ --~m{qmy
long now = System.currentTimeMillis(); ly{Q>MBM
if ((now - lastExecuteTime) > executeSep) { 0F\e*{gc
//System.out.print("lastExecuteTime:"+lastExecuteTime); @"`{gdB$
//System.out.print(" now:"+now+"\n"); 2`o}neF{
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); J01Y%W
lastExecuteTime=now; #e!4njdM
executeUpdate(); ;I#S m;
} x 7;Zwd
else{ y,*>+xk,
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); _uR-Z_z
} ~[CtsCiQ
} u
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} ||lI_B
//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 .o2]ndT/J
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类写好了,下面是在JSP中如下调用。 U~mv1V^.
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<% KXgC]IO~
CountBean cb=new CountBean(); &tULSp@J
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); }Ot
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CountCache.add(cb); G$5N8k[2
out.print(CountCache.list.size()+"<br>"); O>E2G]K]\
CountControl c=new CountControl(); $hkMJ),T~
c.run(); fDn| o"
out.print(CountCache.list.size()+"<br>"); o*_O1P
%>