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: j9XRC9
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CountBean.java @ a?^2X^
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/* EX.`6,:+2
* CountData.java fZ)M
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* se:lKZZ]
* Created on 2007年1月1日, 下午4:44 =|_{J"sv
* *#n?6KqZ
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose RO10$1IW.2
* Open. You can then make changes to the template in the Source Editor. sVjM^y24
*/ ("
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package com.tot.count; z%cpV{Nu
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/** vUa&9Y
* `*`@r o
* @author MsL*\)*s
*/ 6)B6c. 5o
public class CountBean { $%ts#56*
private String countType; I8RPW:B;B
int countId; %1Pn;bUU!
/** Creates a new instance of CountData */ !L)~*!+Gf
public CountBean() {} ?k7z5ow
public void setCountType(String countTypes){ ?9)-?tZ^Q
this.countType=countTypes; wh~g{(Xvq
} r6#It$NU
public void setCountId(int countIds){ 6AW{qU6
this.countId=countIds; =ZaTD-%id
} ee0)%hc1t
public String getCountType(){ (4WAoye |
return countType; 3TDjWW;#~
} r?l7_aBv3
public int getCountId(){ D0 f.XWd
return countId; TrBBV]4
} H]XY
} >#Obhs|S{C
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CountCache.java b?~%u+'3
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/* !N@d51T=N
* CountCache.java E>}(r%B
* +oT/ v3,
* Created on 2007年1月1日, 下午5:01 PqOPRf
* 4%(\y"T
* To change this template, choose Tools | Options and locate the template under IJ`%Zh{f
* the Source Creation and Management node. Right-click the template and choose G; *jL4
* Open. You can then make changes to the template in the Source Editor. !((J-:=
*/ rh6gB]X]3:
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package com.tot.count; yG`J3++
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import java.util.*; `<z"BGQ
/** g2&%bNQ-5
* (pl|RmmDz
* @author ^"?fZSC
*/ =y$|2(6
public class CountCache { :'pLuN
public static LinkedList list=new LinkedList(); 5ZX P$.
/** Creates a new instance of CountCache */ D[NJ{E.{
public CountCache() {} 1@}`dc
public static void add(CountBean cb){ a->;K+
if(cb!=null){ v%=@_`Ht
list.add(cb); 0^L>J"o
} 007(k"=oV
} TBGN',,
} _=wu>h&7
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CountControl.java I)B+h8l72<
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/* "\x<Zg;
* CountThread.java #'@pL0dj
* |\lsTY&2
* Created on 2007年1月1日, 下午4:57 8)wxc1
* 9uNkd2#
* To change this template, choose Tools | Options and locate the template under kma)DW
* the Source Creation and Management node. Right-click the template and choose /5l"rni
* Open. You can then make changes to the template in the Source Editor. GbLuXU
*/ 1TagQ
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package com.tot.count; xE2sb*
import tot.db.DBUtils; 8K]5fkC|
import java.sql.*; =nQgS.D
/** "zn<\z$l
* * 7<{Xbsj^
* @author TspuZR@2
*/ su/!<y
public class CountControl{ Cm~Pn"K_]
private static long lastExecuteTime=0;//上次更新时间 g p2S
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 2+2Gl7" s
/** Creates a new instance of CountThread */ /{[Y l[{"<
public CountControl() {} DxFmsjX[L
public synchronized void executeUpdate(){ cL]vJ`?Ih
Connection conn=null; .;1tu+S
PreparedStatement ps=null; 8,0WHivg
try{ Ly7|:IbC
conn = DBUtils.getConnection(); YPV@/n[N
conn.setAutoCommit(false); /Vg=+FEO
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); eNwF<0}
for(int i=0;i<CountCache.list.size();i++){ CWTPf1?eB
CountBean cb=(CountBean)CountCache.list.getFirst(); x'4q`xDa
CountCache.list.removeFirst(); .d JX,^
ps.setInt(1, cb.getCountId()); [dQL6k";b
ps.executeUpdate();⑴ kgq"b)
//ps.addBatch();⑵ Xiy9Oeq2uh
} Z4^O`yS9+
//int [] counts = ps.executeBatch();⑶ m ll-cp
conn.commit(); b.LMJ'1
}catch(Exception e){ &zxqVI$4
e.printStackTrace(); / bxu{|.
} finally{ l8XgzaW
try{ va>u1S<lO
if(ps!=null) { 6/%dD DU
ps.clearParameters(); [eWZ^Eh"I
ps.close(); Q|DVB
ps=null; EDl*UG83G
} u["3| `C5
}catch(SQLException e){} %`M IGi#
DBUtils.closeConnection(conn); ,R-T( <r
} 0gLl>tF[H
}
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public long getLast(){ _uYidtxo=
return lastExecuteTime; \4/zvlo]h
} z!M8lpIM
public void run(){ 4
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long now = System.currentTimeMillis(); hLv~N}
if ((now - lastExecuteTime) > executeSep) { SH009@l_8
//System.out.print("lastExecuteTime:"+lastExecuteTime); F&Bh\C)]
//System.out.print(" now:"+now+"\n"); r+0<A.''a
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ]#7{x
lastExecuteTime=now; QGR}`n2D
executeUpdate(); 0Z m^6T
} vuNt+
else{ !R 2;]d*
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); KWq&<X5
} @PaOQ@
} T4M"s;::1
} oc^j<!Rh
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 'P:u/Sq?m
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类写好了,下面是在JSP中如下调用。 |g$n-t
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<% >-%}'iz+
CountBean cb=new CountBean(); @L 9C_a
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); pL&
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CountCache.add(cb); ,cesQ
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out.print(CountCache.list.size()+"<br>"); <-]qU}-
CountControl c=new CountControl(); JNJ96wnX1
c.run(); u!B6';XY
out.print(CountCache.list.size()+"<br>"); b%-S'@ew
%>