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: Btgxzf
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CountBean.java shAoib?Kw:
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/* ]'iOV-2^'
* CountData.java iir]M`A.-
* 2aR<xcSg
* Created on 2007年1月1日, 下午4:44 rV0X*[]J>
* W1T%
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* To change this template, choose Tools | Options and locate the template under -FGQn
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* the Source Creation and Management node. Right-click the template and choose ?8GggJC
* Open. You can then make changes to the template in the Source Editor. 34gC[G=
*/ Sb& $xWL
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package com.tot.count; t3//
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/** _P{f+HxU
* ~]_U!r[FA
* @author <lo\7p$A
*/ O8Dav^\y?
public class CountBean { QK`5KB(k'
private String countType; Y*Ra!]62
int countId; N a$eeM
/** Creates a new instance of CountData */ o<8('j
public CountBean() {} \~!!h.xR
public void setCountType(String countTypes){ 8%ea(|Wjg
this.countType=countTypes; w$##GM=Tq
} =G,wR'M
public void setCountId(int countIds){ Oe~x,=X)
this.countId=countIds; .V
} L GdM40
public String getCountType(){ pv[Gg^
return countType; }nUq=@ej
} <%iRa$i5
public int getCountId(){ SIridZ*%
return countId; YEPQ/Pc
} R0g^0K.
} v6C$Y+5~
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CountCache.java T@%\?=P
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/* e~U]yg5X-
* CountCache.java d@XXqCR<
* 3%[;nhbA7
* Created on 2007年1月1日, 下午5:01 &.l^> #
* jP{&U&!i
* To change this template, choose Tools | Options and locate the template under 2Onp{,'}
* the Source Creation and Management node. Right-click the template and choose Gl"|t't(
* Open. You can then make changes to the template in the Source Editor. QdrZi.qKH
*/ 21$E.x 6
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package com.tot.count; zub"Ap3
import java.util.*; uc>":V
/** uCr :+"C
* hYht8?6}m
* @author d%za6=M
*/ ;,}Dh/&E
public class CountCache { mCyn:+
public static LinkedList list=new LinkedList(); M$48}q+
/** Creates a new instance of CountCache */ ,v%'2[}
public CountCache() {} jsFfrS"*
public static void add(CountBean cb){ N[rAb*iT
if(cb!=null){ 3=Q:{
list.add(cb); `Gj(>z*
} BsU}HuQZQ
} p0[+Zm{#l
} 0NeIQr1N_
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CountControl.java 5a-x$Qb9
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/* iF9d?9TWl
* CountThread.java [j}JCmWY
* ~Pj q3etk
* Created on 2007年1月1日, 下午4:57 ;I&XG
* gBky ZK
* To change this template, choose Tools | Options and locate the template under f14^VTzP/#
* the Source Creation and Management node. Right-click the template and choose Z5E; FGPb
* Open. You can then make changes to the template in the Source Editor. q3<kr<SP
*/ 9Ta0Li
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package com.tot.count; hrm<!uKn
import tot.db.DBUtils; <PVwf`W.
import java.sql.*; "M, 1ElQ
/** d[>HxPwo
* ?=ffv]v|
* @author H %c6I
*/ 9b&|'BBW
public class CountControl{ 2E?!Q I\O
private static long lastExecuteTime=0;//上次更新时间 mU]VFPr5
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +J|H~`
/** Creates a new instance of CountThread */ 0$]iRE;O]
public CountControl() {} W|D
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public synchronized void executeUpdate(){ |mP};&b
Connection conn=null; g@37t @I
PreparedStatement ps=null; f"KrPx!^b
try{ Z6rhInIY
conn = DBUtils.getConnection(); x ZP*%yM
conn.setAutoCommit(false); Kp6 @?
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); =C2sl;7~*
for(int i=0;i<CountCache.list.size();i++){ *68 TTBq(
CountBean cb=(CountBean)CountCache.list.getFirst(); #]x3(}3W
CountCache.list.removeFirst();
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ps.setInt(1, cb.getCountId()); r|=1{Nx
ps.executeUpdate();⑴ At"$Cu!k
//ps.addBatch();⑵ +]s,VSL5`
} p_h/hTi
//int [] counts = ps.executeBatch();⑶ "bIb?e2h9G
conn.commit(); P+0'^:J
}catch(Exception e){ >Jmla~A
e.printStackTrace(); VD~5]TQ
} finally{ E?G'F3i
try{ W|7|XO
if(ps!=null) { vY-CXWC7
ps.clearParameters(); 755,=U8'wi
ps.close(); _"ciHYHBQ
ps=null; HbegdbTJ
} @QQ%09*
}catch(SQLException e){} N#K)Z5J)b
DBUtils.closeConnection(conn); Ifn|wrx;g
} |gA@WV-%
} 3)y1q>CQf
public long getLast(){ /@F'f@;
return lastExecuteTime; B;r_[^
} >jX"
public void run(){ w6i2>nu_O
long now = System.currentTimeMillis(); T82 `-bZ
if ((now - lastExecuteTime) > executeSep) { ~;3yjO)l?)
//System.out.print("lastExecuteTime:"+lastExecuteTime); [ ,;e,ld
//System.out.print(" now:"+now+"\n"); 8YFG*HSa
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); [UA*We 1
lastExecuteTime=now; uQIPnd(V
executeUpdate(); B/wD~xC?x
} y>EW,%leC
else{ Hz.i $L0}
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =&z+7Pe[
} `NNP<z+\
} ]p`y
} _y~6b{T
//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 wa8jr5/k"
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类写好了,下面是在JSP中如下调用。 e*2^
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<% E7L>5z
CountBean cb=new CountBean(); $|=|"/
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); w a_{\v=
CountCache.add(cb); V
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out.print(CountCache.list.size()+"<br>"); I?'*vAW<
CountControl c=new CountControl(); h9QM
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c.run(); 4Hz3KKu
out.print(CountCache.list.size()+"<br>"); yv4x.cfI2W
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