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: LlF|VR&P.
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CountBean.java `Q1;Y
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/* ^[=1J
* CountData.java >gTQD\k:D
* ZUd*[\F~!
* Created on 2007年1月1日, 下午4:44 i6-&$<
* vEZd;40y
* To change this template, choose Tools | Options and locate the template under XS_Ib\-50
* the Source Creation and Management node. Right-click the template and choose v(GT+i)|
* Open. You can then make changes to the template in the Source Editor. qX"m"ko
*/ eZbT;
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package com.tot.count; .
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/** _8{6&AmIw
* DQy;W ov
* @author .4%6_`E
*/ CubBD+hl*
public class CountBean { ] vQU(@+I
private String countType; (L
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int countId; ] <y3;T\~
/** Creates a new instance of CountData */ pKzrdw-!
public CountBean() {} /4Sul*{hc
public void setCountType(String countTypes){ 08W^
this.countType=countTypes; w:|YOeP
} ;kLp}CqV
public void setCountId(int countIds){ 1
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this.countId=countIds; k%K\~U8"
} UNhM:!A
public String getCountType(){ # n\|Q\W
return countType; bBp('oEJu
} 3f)!RKS9q
public int getCountId(){ z#Cgd-^7.#
return countId; _h1:{hF
} (U_dPf
} F!MxC
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CountCache.java "o>` Y
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/* ,0^9VWZV
* CountCache.java 5cZKk/"Ad}
* KKGwMJku}
* Created on 2007年1月1日, 下午5:01 |n~Vpy
* K-6+fgeB
* To change this template, choose Tools | Options and locate the template under lj+}5ySG/
* the Source Creation and Management node. Right-click the template and choose *<l9d
* Open. You can then make changes to the template in the Source Editor. #(dERET*
*/ F m$;p6&j
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package com.tot.count; be(p13&od
import java.util.*; |>Wi5h{6X
/** x-Fl|kwX.5
* QV*W#K\7q
* @author qy,X#y'FuE
*/ e=4k|8 G
public class CountCache { MtXd}/
public static LinkedList list=new LinkedList(); V?C_PMa
/** Creates a new instance of CountCache */ W}.p, d
public CountCache() {} F9 4Qb}
public static void add(CountBean cb){ {3kI~s
if(cb!=null){ 3=Va0}#&
list.add(cb); Yvxp(
} ghVxcK
} ,}HnS)+
} L~} 2&w
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CountControl.java TM$Ek^fQ.
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/* I3D#wXW
* CountThread.java ba"a!#wA
* nyr)d%I{
* Created on 2007年1月1日, 下午4:57 1`I#4f
* Oo`b#!L
* To change this template, choose Tools | Options and locate the template under ealh>Y
* the Source Creation and Management node. Right-click the template and choose o](nK5?
* Open. You can then make changes to the template in the Source Editor. i \u"+:j
*/ ^`Qh*:T$
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package com.tot.count; -E>se8 %"
import tot.db.DBUtils; !e(ZEV g
import java.sql.*; #Cz6c%yK
/** ey3;rY1
* hXM2B2[
* @author MESPfS+
*/ A}Gj;vaw
public class CountControl{ ^p !4`S
private static long lastExecuteTime=0;//上次更新时间 o]@g%_3X
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ||vQW\g
/** Creates a new instance of CountThread */ EL=}xug,?
public CountControl() {} ?$\y0lHw/7
public synchronized void executeUpdate(){ O-K!Bv^
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Connection conn=null; uH?lj&
PreparedStatement ps=null; 4,g3 c
try{ x1ID6kI[{*
conn = DBUtils.getConnection(); ky5 gU[
conn.setAutoCommit(false); DozC>
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); uyDYS
for(int i=0;i<CountCache.list.size();i++){ M"$TXXe
CountBean cb=(CountBean)CountCache.list.getFirst(); ;r
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CountCache.list.removeFirst(); %D:5 S?{
ps.setInt(1, cb.getCountId()); Ch9A6?=Hj8
ps.executeUpdate();⑴ q{t"=@lX01
//ps.addBatch();⑵ `O/RNMaC
} -!p-nk@9|
//int [] counts = ps.executeBatch();⑶ ,9;d"ce
conn.commit(); -?Aa RwZ,
}catch(Exception e){ :j m|)
e.printStackTrace(); 7OOod1
} finally{ tHo0q<.oX
try{ CJNz J(
if(ps!=null) { %1p4K)
ps.clearParameters(); |uE_aFQs
ps.close(); Pf]O'G&F
ps=null; 4MOA}FZ~
} ,.+"10=N.
}catch(SQLException e){} D3emO'`gQ
DBUtils.closeConnection(conn); Ev\kq>2O
} K-}'Fiq
} W<uL{k.Kpd
public long getLast(){ 6}6ky9
return lastExecuteTime; ]m(5>h#
} y[!4M+jj
public void run(){ 4';]fmf@[i
long now = System.currentTimeMillis(); >MIp r
if ((now - lastExecuteTime) > executeSep) { ~-w
//System.out.print("lastExecuteTime:"+lastExecuteTime); <#9zc'ED:
//System.out.print(" now:"+now+"\n"); /@bLc1"
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); K!9rH>`\
lastExecuteTime=now; |V|)cPQ
executeUpdate(); tK|hC[
} 5}4MXI4
else{ TIa`cU`
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); (u
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} ].2it{gF?b
} = *A_{u;E
} rHtT>UE=
//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 " lf_`4
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类写好了,下面是在JSP中如下调用。 )LYj,do
ab 1\nzpd
<% &xqe8!FeA
CountBean cb=new CountBean(); : |c,.uO
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); @zJ#16Vi
CountCache.add(cb); ku'%+svD
out.print(CountCache.list.size()+"<br>"); XabrX|B#
CountControl c=new CountControl(); 8&=+Mw
c.run(); 5W!E.fz*T
out.print(CountCache.list.size()+"<br>"); 6zLz<p?
%>