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: mhVdsa
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CountBean.java He vZ}.
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/* [U'I3x,
* CountData.java v7gs
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* o 9\J
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* Created on 2007年1月1日, 下午4:44 ?*cr|G$r[
* v+Mi"ZAd
* To change this template, choose Tools | Options and locate the template under hGh91c;4
* the Source Creation and Management node. Right-click the template and choose l7 Pn5c
* Open. You can then make changes to the template in the Source Editor. 2T 3tKX
*/ pse$ S=
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package com.tot.count; o|(Ivt7jk
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/** H c,e&R
* Gf71udaa
* @author Jx@_OE_vp
*/ o-i9 :AHs
public class CountBean { .3>`y L
private String countType; iOY: a
int countId; uJ-Q]yQ
/** Creates a new instance of CountData */ A\ARjSdb
public CountBean() {} e_=TkG1E6
public void setCountType(String countTypes){ StLFq6BO
this.countType=countTypes; O{^8dwg
} ~H`m"4zQ
public void setCountId(int countIds){ i&mcM_g32
this.countId=countIds; USd7gOq(
} +a3H1 tt~
public String getCountType(){ jKr\mb
return countType; rf?%- X(V
} T,@s.v
public int getCountId(){ *I]/ [d
return countId; +2xgMN6B@
} 9Xl[AVs:M
} sE^ee2]OI@
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CountCache.java | KtI:n4d
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/* C(CwsdlP
* CountCache.java UOIB}ut
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* W{Uz#o
* Created on 2007年1月1日, 下午5:01 qofD@\-
* QNbV=*F?
* To change this template, choose Tools | Options and locate the template under Ls<^z@I
* the Source Creation and Management node. Right-click the template and choose \!LIqqX
* Open. You can then make changes to the template in the Source Editor. /U26IbJ
*/ )iX2r{
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package com.tot.count; moS0y?N
import java.util.*; QjOO^6Fh
/** QL]e<2oPJ
* jQBL8<
* @author H #Hhi<2
*/ iX%9$Bft<
public class CountCache { MB7`'W
public static LinkedList list=new LinkedList(); 3 C{A
/** Creates a new instance of CountCache */ unKPqc%q=n
public CountCache() {} ;
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public static void add(CountBean cb){ j+9;Rvt2
if(cb!=null){ y0f:N
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list.add(cb); @U+#@6
} 3D;?X@
} 1-V"uLy@gC
} zfrNM9C
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CountControl.java n&l(aRoyx
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/* Um^4[rl:#g
* CountThread.java GXaPfC0-y
* '8Cg2v5&w
* Created on 2007年1月1日, 下午4:57 N TcojA{V$
* j(A>M_f;
* To change this template, choose Tools | Options and locate the template under $J8g)cS
* the Source Creation and Management node. Right-click the template and choose Al1_\vx7
* Open. You can then make changes to the template in the Source Editor. \sz*M
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*/ &@K6;T
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package com.tot.count; 5^D094J|^
import tot.db.DBUtils; dGgltY
import java.sql.*; EHy 15RL
/** ,wf:Fr
* ~R&rQJJeJ
* @author IaZmN.k*
*/ '_b3m2I.G
public class CountControl{ wBDHhXi0
private static long lastExecuteTime=0;//上次更新时间 L;lu)|b"
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 0K'{w]Q
/** Creates a new instance of CountThread */ 5dGfO:Dy_
public CountControl() {} 9a[1s|>w-
public synchronized void executeUpdate(){ 15@2h
Connection conn=null; ;A4qE W
PreparedStatement ps=null; 5o0n4W
try{ (gnN</%
conn = DBUtils.getConnection(); mPU}]1*p
conn.setAutoCommit(false); n}b{u@$
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); NE.h/+4
for(int i=0;i<CountCache.list.size();i++){ lz!(OO,g
CountBean cb=(CountBean)CountCache.list.getFirst(); 6cd!;Ca
CountCache.list.removeFirst(); g$ HL::
ps.setInt(1, cb.getCountId()); No"i6R+
ps.executeUpdate();⑴ ul3~!9F5F
//ps.addBatch();⑵ Tw djBMte
} 8 :WN@
//int [] counts = ps.executeBatch();⑶ w$IUm_~waa
conn.commit(); 4#{f8
}catch(Exception e){ t{g@z3
e.printStackTrace(); Qo:vAv
} finally{ V~VUl)
try{ ;vneeW4|
if(ps!=null) { ep~+]7\
ps.clearParameters(); ber&!9
ps.close(); @<3E`j'p
ps=null; DXG`% <ZMn
} ZJF"Yo
}catch(SQLException e){} %%F,G
DBUtils.closeConnection(conn); Ell14Iki
} 'z^'+}iyv
} xT+#K5
public long getLast(){ ^ ^&H:q
return lastExecuteTime; LtH
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} r95,X!
public void run(){ T ay226
long now = System.currentTimeMillis(); zJP jsD]
if ((now - lastExecuteTime) > executeSep) { "n]x%. *
//System.out.print("lastExecuteTime:"+lastExecuteTime); :8(jhs
//System.out.print(" now:"+now+"\n"); Rz&`L8Bz
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); %X's/;(Lx`
lastExecuteTime=now; g4=C]\1
executeUpdate(); 0J^Z)U>j
} Dt<MEpbur
else{ A
+=#
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); KAXjvZN1
} @Co6$<
} Lc?"4
} <p
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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 jI'?7@32`
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类写好了,下面是在JSP中如下调用。 y{&%]Fq
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<% 4i.&geXA.
CountBean cb=new CountBean(); l?$X.CwX
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \9@}0}%`
CountCache.add(cb); 1) K<x
out.print(CountCache.list.size()+"<br>"); xI<B)6D;f
CountControl c=new CountControl(); Y@:l!4DI
c.run(); ;zze.kb&F
out.print(CountCache.list.size()+"<br>"); nTc#I~\
%>