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: 01aw+o
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CountBean.java _Co
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/* .aK=z)
* CountData.java [;toumv
* (Ze\<Y#cv
* Created on 2007年1月1日, 下午4:44 C ]zgVbu
* uuUjIZCtz
* To change this template, choose Tools | Options and locate the template under i7\>uni
* the Source Creation and Management node. Right-click the template and choose Sxy3cv53
* Open. You can then make changes to the template in the Source Editor. (/>
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*/ {c1wJ
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package com.tot.count; E>QEI;
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/** @[/!e`]+
* %<q"&]e,
* @author )5<dmK@
*/ Vz5<Gr
public class CountBean { DAN"&&
private String countType; u0uz~ s
int countId; >NpW$P{'
/** Creates a new instance of CountData */ @6U&7!
public CountBean() {} u7p:6W
public void setCountType(String countTypes){ 2<2a3'pG
this.countType=countTypes; Np~qtR
} phwq#AxQ
public void setCountId(int countIds){ X5tV Xd
this.countId=countIds; Df1eHa5-7
} zcEpywNP
public String getCountType(){ </fTn_{2s8
return countType; ryd}-_LL
} 2NL|_W/
public int getCountId(){ `lO/I+8
return countId; Ki)hr%UFw
} \\"CgH-
} .=
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CountCache.java H/G;hk
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/* )4+uM'2%
* CountCache.java ."q8 YaW
* @6b;sv1W
* Created on 2007年1月1日, 下午5:01 SYOU&*
* 8wS9%+
* To change this template, choose Tools | Options and locate the template under f
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* the Source Creation and Management node. Right-click the template and choose WN#dR~>
* Open. You can then make changes to the template in the Source Editor. Hp
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*/ =0U"07%}
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package com.tot.count; 5_L43-
import java.util.*; o{|
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/** MD+eLA7
* k#@)gL
* @author %bnjK#o"Q
*/ y|.dM.9V
public class CountCache { A<g5:\3
public static LinkedList list=new LinkedList(); rHtX4;f+><
/** Creates a new instance of CountCache */ Od]wh
public CountCache() {} sy9Yd PPE
public static void add(CountBean cb){ Y9(BxDP_+Y
if(cb!=null){ ewinG-hX_
list.add(cb); t2%gS"
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} #+3I$ k
} ?Vr~~v"fg8
} ]"1\z>Hg
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CountControl.java ;77q~_g$
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/* D-5~CK4`
* CountThread.java ~/R}K g(
* nx4E}8!Lh
* Created on 2007年1月1日, 下午4:57 t== a(e
* RQ51xTOL4]
* To change this template, choose Tools | Options and locate the template under 'nqVcNgb
* the Source Creation and Management node. Right-click the template and choose "}UYsXg
* Open. You can then make changes to the template in the Source Editor. pvd9wKz
*/ 7m9T'
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package com.tot.count; O[')[uo8s
import tot.db.DBUtils; gq?~*4H
import java.sql.*; >z8y L+
/** }(if|skau
* E{|n\|
* @author +Sdki::
*/ ^TY8,qDA
public class CountControl{ 51M'x_8
private static long lastExecuteTime=0;//上次更新时间 rxI Ygh
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 v]KI=!Gs
/** Creates a new instance of CountThread */ y/A<eHLy
public CountControl() {} @Cd}1OT)
public synchronized void executeUpdate(){ kC6s_k
Connection conn=null; qfEB VS(
PreparedStatement ps=null; N6-bUM6%I
try{ E;x~[MA
conn = DBUtils.getConnection(); K,GX5c5
conn.setAutoCommit(false); ;%aWA
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ol8uV{:"
for(int i=0;i<CountCache.list.size();i++){ iJK rNRj
CountBean cb=(CountBean)CountCache.list.getFirst(); WN?meZ/N/
CountCache.list.removeFirst(); 'Xzi$}E D
ps.setInt(1, cb.getCountId()); ^-7{{/
ps.executeUpdate();⑴ zn{[]J
//ps.addBatch();⑵ Tn3f5ka'
} d
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//int [] counts = ps.executeBatch();⑶ ('pxX+
conn.commit(); pDx}~IB
}catch(Exception e){ z'}?mE3i
e.printStackTrace(); p}swJ;S
} finally{ NBZ>xp[U
try{ jk}m
if(ps!=null) { }tZA7),L
ps.clearParameters(); >pl*2M&
ps.close(); oE4hGt5x{
ps=null; 7dU7cc
} 0=J69Yd
}catch(SQLException e){} :WnXoL
DBUtils.closeConnection(conn); 0H{0aQQ
} @$'1
} T)B1V,2j=
public long getLast(){ 8M'6Kcr
return lastExecuteTime; {VE$i2nC8
} P X<,/6g z
public void run(){ Mky8qVQ2
long now = System.currentTimeMillis(); =1vVITwl
if ((now - lastExecuteTime) > executeSep) { [f'DxZF-
//System.out.print("lastExecuteTime:"+lastExecuteTime); CSooJ1Ep~'
//System.out.print(" now:"+now+"\n"); rJm%qSZz
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); }t #Hq
lastExecuteTime=now; f?C !Br}
executeUpdate(); SB[,}h<u1
} KhV;
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else{ ( Dl68]FX
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); y0'"
} w8g36v*+(u
}
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} Vkb&'
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//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 ZvO:!u0+"
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类写好了,下面是在JSP中如下调用。 .*g;2.-qv&
br'/>Un"
<% 2'r8#,)
CountBean cb=new CountBean(); _?2xIo
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); @*O(dw
CountCache.add(cb); uL4@e
out.print(CountCache.list.size()+"<br>"); 4.dMNqU
CountControl c=new CountControl(); jWW2&cBm\
c.run(); p8^^Pva/
out.print(CountCache.list.size()+"<br>"); KXFa<^\o
%>