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: Q|5wz]!5Y(
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CountBean.java ZLL0 6p
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/* gEi"m5po
* CountData.java 2A`EFk7_X
* SF.,sCk
* Created on 2007年1月1日, 下午4:44 ~]"}s(J;
* |qI_9#M\(
* To change this template, choose Tools | Options and locate the template under 3N]pN<3@
* the Source Creation and Management node. Right-click the template and choose t4gD*j6J3
* Open. You can then make changes to the template in the Source Editor. (5yg\3Jvp
*/ XLmbpEh
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package com.tot.count; kdmVHiGF
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/** }1_gemlf
* Rb9Z{Clq>
* @author aaaC8;.
*/ tkuN$Jl
public class CountBean { u8?ceM^r
private String countType; R8],}6,;E}
int countId; zb;'}l;+
/** Creates a new instance of CountData */ 4&y_+
public CountBean() {} L\-T[w),z7
public void setCountType(String countTypes){ q>Q|:g&:
this.countType=countTypes; siD Sm
} .5dZaI)
public void setCountId(int countIds){ @Rx/]wyH
this.countId=countIds; K/%aoTO}
} {qx"/;3V
public String getCountType(){ QGLm4 Wl9
return countType; KO5Q;H
} " g_\W
public int getCountId(){ BV!Kiw
return countId; 3i s.c)
} cA/2,i
} o1n c.2/0J
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CountCache.java gsU&}R1*h
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/* =r_ SMTu
* CountCache.java Mb<KZ_wYOX
* QPFpGS{d
* Created on 2007年1月1日, 下午5:01 $~:hv7%
* 4uu*&B
* To change this template, choose Tools | Options and locate the template under wPc,FH+y
* the Source Creation and Management node. Right-click the template and choose Zy!\=-dSm
* Open. You can then make changes to the template in the Source Editor. ~Yr.0i.W
*/ QY^ y(I49
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package com.tot.count; 2XI%4
import java.util.*; [{ zekF~)@
/** +6;OB@
* #);
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* @author AVcZ.+?
*/ R 7{r Y
public class CountCache { :ZzG5[o3
public static LinkedList list=new LinkedList(); $K,aLcu
/** Creates a new instance of CountCache */ f
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public CountCache() {} fe0 Y^vW
public static void add(CountBean cb){ &c\8`# 6
if(cb!=null){ {==Q6BG*
list.add(cb); qkBnEPWZy
} qb9%Y/xy
} WYh7Y
} 5o72X k
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CountControl.java ;J5oO$H+68
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/* 3 $kZu
* CountThread.java &G"]v]V
* XSxya.1
* Created on 2007年1月1日, 下午4:57 3(}?f
* A5/h*`Q\\
* To change this template, choose Tools | Options and locate the template under t)m4"p7
* the Source Creation and Management node. Right-click the template and choose 8ziYav
* Open. You can then make changes to the template in the Source Editor. a%]p*X!
*/ V2y[IeSQ
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package com.tot.count; Ec[:6}
import tot.db.DBUtils; 6@$[x* V
import java.sql.*; K{iayg!k
/** *1%g=vb
* {Ise (>V
* @author zCQv:.0L
*/ TxiJ?sDh*
public class CountControl{ B#gmT2L
private static long lastExecuteTime=0;//上次更新时间 es6e-y@e
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 pE`(kD
/** Creates a new instance of CountThread */ +X?jf.4
public CountControl() {} `C()H@;
public synchronized void executeUpdate(){ gTq-\k(
Connection conn=null; ~ACB#D%
PreparedStatement ps=null; >Y,7>ahyt
try{ *PI3L/*
conn = DBUtils.getConnection(); #2MwmIeA
conn.setAutoCommit(false); h\dIp`H
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?");
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for(int i=0;i<CountCache.list.size();i++){ %*/[aq, #
CountBean cb=(CountBean)CountCache.list.getFirst(); 'v,W
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CountCache.list.removeFirst(); =DCQ!02
ps.setInt(1, cb.getCountId()); ydFY<Mb(o
ps.executeUpdate();⑴ >:xnjEsi$/
//ps.addBatch();⑵ >2|#b
} K
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//int [] counts = ps.executeBatch();⑶ "s*{0'jo
conn.commit(); kQb0pfYs
}catch(Exception e){ QxkfP %_g
e.printStackTrace(); :C&?(HJ&r
} finally{ hh?'tb{
try{ ,S8Vfb &
if(ps!=null) { ysa"f+/
ps.clearParameters(); 6RF01z|~_
ps.close(); ENmo^O#,u
ps=null; PY2`RZ/ @
} K1hw'AaQ
}catch(SQLException e){} vIRE vj#U
DBUtils.closeConnection(conn); jmb\eOq+~V
} 226s:\d
} h1Lp:@:|
public long getLast(){ /}VQzF
return lastExecuteTime; +-Dd*yD6<
} w iq{Jo#
public void run(){ AVJk
long now = System.currentTimeMillis(); EvYw$j
if ((now - lastExecuteTime) > executeSep) { d.+vjMI
//System.out.print("lastExecuteTime:"+lastExecuteTime); XX F9oy8
//System.out.print(" now:"+now+"\n"); JC#@sJ4az)
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); T'V(%\w
lastExecuteTime=now; Q(sbClp"
executeUpdate(); GWhZ Mj
} 70NHU;&N
else{ k`t'P6
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); BOWTH{KR<<
} r:q#l~;^
} 8iCIs=06
} SUEw5qitB
//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 7HJv4\K
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类写好了,下面是在JSP中如下调用。 ?
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<% WNx^Rg"
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CountBean cb=new CountBean(); ZChY:I$<
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); y((_V%F}
CountCache.add(cb); WY,t> 1c
out.print(CountCache.list.size()+"<br>"); @v'D9 ?
CountControl c=new CountControl(); I>xB.$A
c.run(); 4"2/"D0
out.print(CountCache.list.size()+"<br>"); c,qCZ-.Sg
%>