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: Vtb1[cnna
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CountBean.java H}Ucrv:
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/* q-nER<
* CountData.java G?`-]FMO
* ;+ azeW^
* Created on 2007年1月1日, 下午4:44 0VN7/=n|
* ,_jC$
* To change this template, choose Tools | Options and locate the template under L@RIZu>ZW+
* the Source Creation and Management node. Right-click the template and choose @o>EBZ7MS
* Open. You can then make changes to the template in the Source Editor. 22
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*/ )%mg(O8uL
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package com.tot.count; }`xdWY
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/** 2*[QZ9U[@
* 5RF4]$zT
* @author 0,_b)
*/ ESTM$k}X
public class CountBean { }7eh F6
private String countType; zI^]esX!2_
int countId; qP3q
/** Creates a new instance of CountData */ [dB$U}SEj
public CountBean() {} K R, z^9
public void setCountType(String countTypes){ O0T/#<Cn!
this.countType=countTypes; ~`qEWvPn
} |7"$ w%2
public void setCountId(int countIds){ u%3i0BajY
this.countId=countIds; 5\bJR0I@
} T%$jWndI
public String getCountType(){ !^w
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return countType; x5h~G
} DkDoA;m
public int getCountId(){ k?*KnfVh!
return countId; _ \D"E>oM
} `!vUsM .d
} |4;UyHh
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CountCache.java .5w azvA
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/* edipA
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* CountCache.java kJ{+M] pW
* ^{F_a
* Created on 2007年1月1日, 下午5:01 aI3CNeav
* 8|@9{
* To change this template, choose Tools | Options and locate the template under e(?]SU|
* the Source Creation and Management node. Right-click the template and choose =2Cj,[$
* Open. You can then make changes to the template in the Source Editor. :>+\17tx
*/ wi_'iv
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package com.tot.count; I9?Ec6a_
import java.util.*; aUc|V{Jp
/** pTJX""C
* MHU74//fe
* @author E5</h"1
*/ M5g\s;y;
public class CountCache { Z
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public static LinkedList list=new LinkedList(); MSw$_d
/** Creates a new instance of CountCache */ %Ip*Kq-
public CountCache() {} >6<q8{*
public static void add(CountBean cb){ #wY0D_3@1
if(cb!=null){ _%/}>L>-`8
list.add(cb); .ubE2X[ ][
} @n-r-Q
} )5_jmW`n
} S<`I
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CountControl.java 'n;OB4
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/* Ts.wh>`
* CountThread.java Qm4o7x{q
* A1"SLFY
* Created on 2007年1月1日, 下午4:57 x79Ha,
* l+*&:Q/
* To change this template, choose Tools | Options and locate the template under xtfBfA
* the Source Creation and Management node. Right-click the template and choose i,IB!x
* Open. You can then make changes to the template in the Source Editor. H/+B%2Zj
*/ z^<L(/rg9"
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package com.tot.count; 3]RyTQ
import tot.db.DBUtils; +Q$h ]^>~
import java.sql.*; Wp)*Mbq@
/** TX=yPq
* T4)fOu3]
* @author m3bCZ9iE
*/ ) ZfdQ3
public class CountControl{ 3"N)xO-
private static long lastExecuteTime=0;//上次更新时间 \xv;sl$f
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Fqy\CMC
/** Creates a new instance of CountThread */ QnQOm""
public CountControl() {} U;N:j8
public synchronized void executeUpdate(){ M_g?<rK
Connection conn=null; /D!;u]
PreparedStatement ps=null; "]K>j'^Zs<
try{ MN^Aw9U
conn = DBUtils.getConnection(); `d7n?|pD
conn.setAutoCommit(false); z2_6??tS/c
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); $5x ,6[&
for(int i=0;i<CountCache.list.size();i++){ eI45PMP
CountBean cb=(CountBean)CountCache.list.getFirst(); '2^7-3_1
CountCache.list.removeFirst(); >P6BW
ps.setInt(1, cb.getCountId()); PHOP%hI$
ps.executeUpdate();⑴ 0k)rc$eDF+
//ps.addBatch();⑵ Q7Iw[=;\
} yAL[[
//int [] counts = ps.executeBatch();⑶ GZI`jS"lU
conn.commit(); 'k;rH!R
}catch(Exception e){ wX >*H
e.printStackTrace();
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} finally{ ~5FW[_
try{ 4}+/F}TbJ5
if(ps!=null) { @+3kb.P%7
ps.clearParameters(); .p0Clr!
ps.close(); 1 zw*/dp
ps=null; *(C(tPhC
} HK`I\,K
}catch(SQLException e){} ZKHG !`X0
DBUtils.closeConnection(conn); pRkP~ZISU
} @)o^uU T
} fU=B4V4@
public long getLast(){ 8Nu=^[qwQM
return lastExecuteTime; /xtq_*I1S
} iQDx{m3]
public void run(){ {|I;YDA
long now = System.currentTimeMillis(); Z}$TKO*u
if ((now - lastExecuteTime) > executeSep) { )W/;=K
//System.out.print("lastExecuteTime:"+lastExecuteTime); /1Ue?)g
//System.out.print(" now:"+now+"\n"); ck?YI]q|
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); dXF^(y]l
lastExecuteTime=now; DC{>TC[p1k
executeUpdate(); ,) J~ ,^f6
} 9IX/wm"
else{ ;)N>t\v
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); wF((
} jv&*uYm
} lOtDqb&
} KQB3m"
//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 0c} }Q
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类写好了,下面是在JSP中如下调用。 vZ.x{"n'~
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<% ``wSc0\
CountBean cb=new CountBean(); s"t$0cH9
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ,l<6GB2\
CountCache.add(cb); 'Lu__NfN
out.print(CountCache.list.size()+"<br>"); '7XIhN9
CountControl c=new CountControl(); z`:lcF{V
c.run(); 0`^&9nR
out.print(CountCache.list.size()+"<br>");
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%>