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: (txt8q
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CountBean.java ^;64!BaK
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/* 1 mHk =J~
* CountData.java pVz pN8!
* .~22^k
* Created on 2007年1月1日, 下午4:44 6puVw-X
* q]+)c2M
* To change this template, choose Tools | Options and locate the template under i;avwP<0
* the Source Creation and Management node. Right-click the template and choose S[.5n]
* Open. You can then make changes to the template in the Source Editor. *JS"(. '(
*/ i^/DiWdyf
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package com.tot.count; _r7=&oL.Q
@e={Wy+Vm(
/** neIy~H_#!
* 1:YAn
* @author hy=u}^F.C
*/ I1~G$)w#
public class CountBean { %Il ;B~t
private String countType; tgfM:kzw
int countId; H-m`Dh5{
/** Creates a new instance of CountData */ &]*|6cR$E
public CountBean() {} RSFJu\0}N
public void setCountType(String countTypes){ jDJ.
this.countType=countTypes; Hz5;Ruw'
} aulaX/'-_
public void setCountId(int countIds){ [[&)cbv
this.countId=countIds; N[]U%9[=2F
} ny~W]1
public String getCountType(){ tnNZ`]qY
return countType; Lv^a+'
} # a.\P.{L
public int getCountId(){ Kf&r21h
return countId; u
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} 6_Fpca3L
} *<?XTs<
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CountCache.java j]#wrm
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/* !HvGlj@(|
* CountCache.java =s6E/K
*
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* Created on 2007年1月1日, 下午5:01 g"w)@*?K
* 6,a%&1_
* To change this template, choose Tools | Options and locate the template under 4 ;^g MI9
* the Source Creation and Management node. Right-click the template and choose B6(h7~0(<
* Open. You can then make changes to the template in the Source Editor. v<%]XHN
*/ XEa~)i{O
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package com.tot.count; `|uoqKv
import java.util.*; ~DK F%}E
/** }]tFz}E\
* l~4_s/
* @author |z ]aa
*/ |}%(6<
public class CountCache { H'D#s;SlR
public static LinkedList list=new LinkedList(); j,Pwket
/** Creates a new instance of CountCache */ m\1VF\
public CountCache() {} ~NA1SZ{Y+
public static void add(CountBean cb){ !+5C{Hs2
if(cb!=null){ 4Fh&V{`W
list.add(cb); `3]Rg0g&Xe
} tx gvVQ
} $R8>u#K!
} <&KLo>B^
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CountControl.java ^zKt{a
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/* 2\DTJ`Y,
* CountThread.java (y%%6#bd
* `:V}1ioX5
* Created on 2007年1月1日, 下午4:57 uAc@ Z-
* IPwj_jvw
* To change this template, choose Tools | Options and locate the template under ZK%Kgk[\:~
* the Source Creation and Management node. Right-click the template and choose s bs[=LW4
* Open. You can then make changes to the template in the Source Editor. o?;F.W_
*/ <g]
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+}kO;\
package com.tot.count; 4 0p3Rv
import tot.db.DBUtils; r[6#G2
import java.sql.*; U.HoFf+HN
/** .MzOLv
* |*Of^IkG0
* @author -mE
*/
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public class CountControl{ hEVjeC
private static long lastExecuteTime=0;//上次更新时间 pCz@(:0
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ~*jsB=XM/
/** Creates a new instance of CountThread */ @gH(/pFX
public CountControl() {} @X3 gBGY)
public synchronized void executeUpdate(){ 2f`WDL
Connection conn=null; @][ a8:Y9I
PreparedStatement ps=null; "xL;(Fqu
try{ f37ji
conn = DBUtils.getConnection(); 20$F$YYuk
conn.setAutoCommit(false); c*Eok?O
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); @47[vhE
for(int i=0;i<CountCache.list.size();i++){ )>-77\
CountBean cb=(CountBean)CountCache.list.getFirst(); Rrh<mo(yj#
CountCache.list.removeFirst(); }Q47_]5
ps.setInt(1, cb.getCountId()); c Bg,k[,
ps.executeUpdate();⑴ JZWgr&O<
//ps.addBatch();⑵ (y-x01H
} <WZ1-
//int [] counts = ps.executeBatch();⑶ -q'xC: m
conn.commit(); x:!C(Ep)
}catch(Exception e){ SPfD2%jjC
e.printStackTrace(); &oon'q5;
} finally{ /'R UA
try{ DZ%g^DRZX
if(ps!=null) { nYI/&B{p
ps.clearParameters(); oq=?i%'>
ps.close(); 9`)w@-~~
ps=null; `Ev A\f
} Uuwq7oFub
}catch(SQLException e){} +vSCR(n
DBUtils.closeConnection(conn); 6 {b%Jfo
} Wv6z%r<
} CP c"
public long getLast(){ ,`ZPtnH+
return lastExecuteTime; X_vI0YX9
} 3*CzXK>`M&
public void run(){ +A]&AkTw
long now = System.currentTimeMillis(); Z}sG3p
if ((now - lastExecuteTime) > executeSep) { N>uA|<b,
//System.out.print("lastExecuteTime:"+lastExecuteTime); H.jLGe>
//System.out.print(" now:"+now+"\n"); :5TXA
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); f?/|;Zo4
lastExecuteTime=now; [z
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executeUpdate(); p2pTs&}S
} `E./p
else{ Rel(bA-[N
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); -&q