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: %>WbmpIyc
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CountBean.java )2Hff.
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/* ;$BdP7i:
* CountData.java X jE>k!=I
* %gcc
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* Created on 2007年1月1日, 下午4:44 S*"u/b;
* -Z^4L
* To change this template, choose Tools | Options and locate the template under ?`zgq>R}w[
* the Source Creation and Management node. Right-click the template and choose 1j\aH&)GH
* Open. You can then make changes to the template in the Source Editor. 6`$[Ini
*/ *]x*B@RF
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package com.tot.count; nN3$\gHp8i
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/** Ra3ukYG[
* ~ ~8rI[/
* @author ,}C8;/V
*/ }4nT.!5
public class CountBean { A%vsno!
private String countType; AaN"7.Z/
int countId; g6sjc,`
/** Creates a new instance of CountData */ bQaoMZB
public CountBean() {} P|^$kK
public void setCountType(String countTypes){ q9dLHi<1
this.countType=countTypes; 4S
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} }~o
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public void setCountId(int countIds){ z8Q"%@
this.countId=countIds; =f:(r'm?r.
} ACV ek
public String getCountType(){ ~]8p_;\
return countType; YCw('i(|
} sg'NBAo"
public int getCountId(){ q2_`v5t
return countId; t]^_l$
} ,fnsE^}.U
} TRKgBK$,
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CountCache.java vN{-?
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/* ~2/{3m{3 A
* CountCache.java ~F#A
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* OCHm;
* Created on 2007年1月1日, 下午5:01 "A]Y~iQ
* zfjTQMaxh
* To change this template, choose Tools | Options and locate the template under (:Cc3
* the Source Creation and Management node. Right-click the template and choose %^9:%ytt
* Open. You can then make changes to the template in the Source Editor. <]8^J}8T{D
*/ ?An,-N-ezf
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package com.tot.count; 0k?Sq#7q
import java.util.*; C>*n9l[M~
/** R I@*O6\/I
* acOJ]]
* @author Dw |3Z
*/ \]Z&P,}w
public class CountCache { 7nz!0I^
public static LinkedList list=new LinkedList(); hXX1<~k
/** Creates a new instance of CountCache */ 64D%_8#m
public CountCache() {} 4&N$: j<
public static void add(CountBean cb){ 6~Wu`
if(cb!=null){ *`KrVu 6s
list.add(cb); bV3lE6z
} |5xz l
} i<u9:W
} y3yvZD
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CountControl.java j
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/* /84bv=
* CountThread.java fr#Qz{
* WOO%YU =
* Created on 2007年1月1日, 下午4:57 +8UdvMN
* pN$;!
* To change this template, choose Tools | Options and locate the template under \$;~74}
* the Source Creation and Management node. Right-click the template and choose Z5>V{o
* Open. You can then make changes to the template in the Source Editor. j,t~
*/ Lp~^*j(
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package com.tot.count; 8^w/HCC8O
import tot.db.DBUtils; \|Qb[{<:,
import java.sql.*; p^8JLC
/** ]
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* C|6{fd4?
* @author ;i9>}]6
*/ >Me]m<$E;
public class CountControl{ B~_Spp
private static long lastExecuteTime=0;//上次更新时间 >Zdi5')
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 UE)fUTS
/** Creates a new instance of CountThread */ 99KVtgPm
public CountControl() {} g+9v$[!
public synchronized void executeUpdate(){ !BRcq~-.
Connection conn=null; aFG3tuaKrQ
PreparedStatement ps=null; & z gPN8u
try{ q2!'==h2i
conn = DBUtils.getConnection(); dwp:iM
conn.setAutoCommit(false); )nnCCRS6
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); L*O>IQh2
for(int i=0;i<CountCache.list.size();i++){ XTj73 MWY
CountBean cb=(CountBean)CountCache.list.getFirst(); !~d'{sy6
CountCache.list.removeFirst(); Yzd2G,kZ=
ps.setInt(1, cb.getCountId()); Y*\6o7
ps.executeUpdate();⑴ a*Jn#Mx<M
//ps.addBatch();⑵ Uk02IOXQ
} ?48AY6
//int [] counts = ps.executeBatch();⑶ p1
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conn.commit(); K_##-6>
}catch(Exception e){ H56
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e.printStackTrace(); %uEtQh[
} finally{ .\)k+ R
try{ qsvpW%?aE
if(ps!=null) { OT+ Ee
ps.clearParameters(); i7f%^7!
ps.close(); M*H<
n*
ps=null; E&9!1!B
} leIy|K>\m
}catch(SQLException e){} a hwy_\
DBUtils.closeConnection(conn); XSl!T/d
} "<*nZ~nE)
} 8;8YA1@w
public long getLast(){ {,F/KL^u
return lastExecuteTime; gr\@sx?b
} :;_#5
public void run(){ u0'i!@795
long now = System.currentTimeMillis(); /4H[4m]I
if ((now - lastExecuteTime) > executeSep) { 6s5b$x
//System.out.print("lastExecuteTime:"+lastExecuteTime); ,$BgR2^
//System.out.print(" now:"+now+"\n"); ;24'f-Eri
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); -s89)lUkS
lastExecuteTime=now; CfY7<o1>
executeUpdate(); O8$~*NFJf
}
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else{ Nor`c+,4
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); NZ)b:~a
} &PSTwZd
} yP%o0n/"x
} 55,=[
//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 2x6<8J8v*
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类写好了,下面是在JSP中如下调用。 :4iU^6
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<% -HN%B?}. x
CountBean cb=new CountBean(); '5V^}/
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); w`0)x5
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CountCache.add(cb); ]DU61Z"v?b
out.print(CountCache.list.size()+"<br>"); v}f&q!
CountControl c=new CountControl(); )ZN(2z
c.run(); 'jN/~I
out.print(CountCache.list.size()+"<br>"); HrDTn&/
%>