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: ,3DXFV'uxb
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CountBean.java qk(P>q8[
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/* nxm$}!Df
* CountData.java ,.IEDF<&
* (WlIwKP
* Created on 2007年1月1日, 下午4:44 qa >Ay|92e
* [&S}dQ"
* To change this template, choose Tools | Options and locate the template under 7cg*|E@
* the Source Creation and Management node. Right-click the template and choose -ZOBAG*
* Open. You can then make changes to the template in the Source Editor. d^ ZMS~\*
*/ H&}ipaDO
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package com.tot.count; #<7O08:
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/** n}-3o]ku
* Ok-.}q>\Mv
* @author |dE
-^"_
*/ >cmE
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public class CountBean { !|?e7u7
private String countType; G28O%jD?
int countId; 5x2Ay=s
/** Creates a new instance of CountData */ w2(guL($
public CountBean() {} 6$ Q,Y}j
public void setCountType(String countTypes){ =TvzS%U
this.countType=countTypes; ITuq/qts]A
} ~=r^3nZR/J
public void setCountId(int countIds){ donw(_=
this.countId=countIds; nx":"LFI
} 6qvp*35Cx
public String getCountType(){ E9!N>0
return countType; >n5:1.g
} xom<P+M!|
public int getCountId(){ {1J&xoV"
return countId; a)-FGP^
} bucR">_p
} 7Ob*Yv=[
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CountCache.java \6|/RFT
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/* 0IM8
* CountCache.java '8FC<=+p[
* }S_oH9A
* Created on 2007年1月1日, 下午5:01 w[Gh+L30=5
* mZk0@C&:6
* To change this template, choose Tools | Options and locate the template under 1m<RwI3s
* the Source Creation and Management node. Right-click the template and choose qUF'{K
* Open. You can then make changes to the template in the Source Editor. 4R+.N
*/ v*hRz;
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package com.tot.count; RWq{Ff}Hk
import java.util.*; /G{_7cb
/** Jwn AW}=
* 3M*Bwt;F_
* @author }w-wSkl1
*/ 4_M>OD/"
public class CountCache { /BKe+]dS*
public static LinkedList list=new LinkedList(); !v#xb3"/
/** Creates a new instance of CountCache */ fg%&N2/(.B
public CountCache() {} _,h@:Xij
public static void add(CountBean cb){ VU|dV\>
if(cb!=null){ j|.} I
list.add(cb); V)o,1
} 79J-)e9
} 1,y&d}GW
} FeJr\|FT
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CountControl.java g{s'GyV8t
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/* "HMP$)d
* CountThread.java nCg66-3A
* d=.2@Ry
* Created on 2007年1月1日, 下午4:57 dmrps+L
* `A%^UCd
* To change this template, choose Tools | Options and locate the template under 9e!NOl\_;.
* the Source Creation and Management node. Right-click the template and choose 5@osnf?
* Open. You can then make changes to the template in the Source Editor. YL^=t^!4
*/ -!qu"A:
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package com.tot.count; XP[uF ;w
import tot.db.DBUtils; K5Wg"^AHY/
import java.sql.*; 1tzV8(7
/** u }hF8eD
* ~.Ik#At
* @author G*
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*/ W><Zn=G4)b
public class CountControl{ tEd.'D8 s
private static long lastExecuteTime=0;//上次更新时间 sf}Dh
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 %u{W7
/** Creates a new instance of CountThread */ JD>d\z2QC
public CountControl() {} [ Mg8/Oy
public synchronized void executeUpdate(){ Ha>*?`?yI
Connection conn=null; gv15t'y9
PreparedStatement ps=null; iSRpfU
try{ qKS;x@
conn = DBUtils.getConnection(); jPvDFT^d/
conn.setAutoCommit(false); 0:Xxl76v4
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); n7aU<`U
for(int i=0;i<CountCache.list.size();i++){ ~0"p*?^
CountBean cb=(CountBean)CountCache.list.getFirst(); vZ7gS
CountCache.list.removeFirst(); H14Ic.&
ps.setInt(1, cb.getCountId()); Huw\&E
ps.executeUpdate();⑴ q=HHNjj8
//ps.addBatch();⑵ +H/jK @
} 7"X>?@
//int [] counts = ps.executeBatch();⑶ 4S0>-?{
conn.commit(); F7m?xy
}catch(Exception e){ ge3sU5iZ
e.printStackTrace(); $>M<j
} finally{ .@ C{3$,VG
try{ XK(`mEi
if(ps!=null) { ?VU(Pq*`
ps.clearParameters(); oj,lz?
ps.close(); FX<b:#
ps=null; Q~D`cc|]
} W" "*ASi
}catch(SQLException e){} `L;eba
DBUtils.closeConnection(conn); @\_x'!R
} ` >!n
} PQW(EeQ
public long getLast(){ Gnm4gF!BI
return lastExecuteTime; - "*r
} BDY}*cX
public void run(){ >Y 1{rSk
long now = System.currentTimeMillis(); iJFs0?*
if ((now - lastExecuteTime) > executeSep) { :m=m}3/:
//System.out.print("lastExecuteTime:"+lastExecuteTime); OIHz I2{
//System.out.print(" now:"+now+"\n"); ?{"mP 'dD
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); :yT-9Ze%q
lastExecuteTime=now; /76 1o\Q
executeUpdate(); D-imL;|
} m%+IPZ2m
else{ h~U02"$
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ~\nBjM2
} h5z)Lc^
} U7mozHS,:9
} PHg48Y"Nd
//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 et,GrL)l
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类写好了,下面是在JSP中如下调用。 ^ OJyN,A
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<% V5"CSMe
CountBean cb=new CountBean(); NY$uq+Z>
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); "i.r@<)S
CountCache.add(cb); "yziXT@V
out.print(CountCache.list.size()+"<br>"); d&cU*
CountControl c=new CountControl(); SQsSa1
c.run(); %,@vWmn
out.print(CountCache.list.size()+"<br>"); x)rlyjFM
%>