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: ,#r>#fi0
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CountBean.java _`zj^*%
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/* #\$R^u]!
* CountData.java Ui7S8c#tH
* u1&pJLK0[
* Created on 2007年1月1日, 下午4:44 Ij }RlYQz
* P-QZ=dm
* To change this template, choose Tools | Options and locate the template under ]W%<<S
* the Source Creation and Management node. Right-click the template and choose ?c^0%Op
* Open. You can then make changes to the template in the Source Editor. eg-,;X#
*/ jC<!Ny-$
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package com.tot.count; 8:,l+[\
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/** m>'sM1s
* (;' ?56
* @author <gKT 7ONtg
*/ 1G+42>?<1
public class CountBean { Ed)t87E
private String countType; |,Y(YSg.
int countId; A@EeX4N
/** Creates a new instance of CountData */ xS`>[8?3<T
public CountBean() {} g Xvuv^
public void setCountType(String countTypes){ /AP@Bhm
this.countType=countTypes; F"3PP ~
} F%x8y
public void setCountId(int countIds){ </|IgN$w`
this.countId=countIds; *O|Z[>
} W9?Vh{w
public String getCountType(){ C_Y^<
return countType; `|;R}"R;
} wbzAX
public int getCountId(){
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return countId; ,&!Txyye
} n9Z|69W6>
} ^e>`ob
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CountCache.java vO"Sy{)Z>
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/* RUmJ=i'4/
* CountCache.java Uax- z
* }Z-]m
* Created on 2007年1月1日, 下午5:01 qde.;Yv9
* ]z,W1Zs?
* To change this template, choose Tools | Options and locate the template under iU\WV
* the Source Creation and Management node. Right-click the template and choose %J?;@ G)r
* Open. You can then make changes to the template in the Source Editor. 1_!*R]a q
*/ :~pPB#)nk
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package com.tot.count; 2`Xy}9N/Y
import java.util.*; z)r)w?A
/** HP2]b?C
* #m6 eG&a
* @author #n7uw
*/ "EQ-`b=I4
public class CountCache { BM#cosV7%h
public static LinkedList list=new LinkedList(); "8aw=3A
/** Creates a new instance of CountCache */ j9sf~}D>
public CountCache() {} [:
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public static void add(CountBean cb){ ?C6iJnm
if(cb!=null){ o jzO?z
list.add(cb); vW
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} 6yKr5t H4
} Pm6/sO
} lN)U8
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CountControl.java T&I*8 R~
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/* 67Z|=B!7
* CountThread.java veg\A+:'
* oW(p (>
* Created on 2007年1月1日, 下午4:57 ~fn2B
* PBb@J'b
* To change this template, choose Tools | Options and locate the template under >n)N=Zyu
* the Source Creation and Management node. Right-click the template and choose J.mEOo!>
* Open. You can then make changes to the template in the Source Editor. &""~Pn8
*/ _K>cB<+d
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package com.tot.count; cpp0Y^
import tot.db.DBUtils; *? 7Ie;)
import java.sql.*; ^$DpdzI
/** Sve~-aG
* H?8KTl=e
* @author
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*/ xXM`f0s@+]
public class CountControl{ _) 2fXG!
private static long lastExecuteTime=0;//上次更新时间 Zi[@xG8dm
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 {n=)<w
/** Creates a new instance of CountThread */ Q2iS0#
public CountControl() {} aHe/MucK
public synchronized void executeUpdate(){ ,2/qQD n/
Connection conn=null; 6$w)"Rq
PreparedStatement ps=null; d {a^
try{ oori t
conn = DBUtils.getConnection(); ^wCjMi(sj
conn.setAutoCommit(false); PmO utYV
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); d>}pz
for(int i=0;i<CountCache.list.size();i++){ "d>{hP
CountBean cb=(CountBean)CountCache.list.getFirst(); F_U3+J >
CountCache.list.removeFirst(); IY?[ 0S
ps.setInt(1, cb.getCountId()); gR"'|c
ps.executeUpdate();⑴ V=
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//ps.addBatch();⑵ i2/:'
i
} .{LFc|Z[
//int [] counts = ps.executeBatch();⑶ hgX@?WWR
conn.commit(); @dV'v{:,
}catch(Exception e){ IL?3>$,
e.printStackTrace(); gYfN?A*`_
} finally{ =xWZJ:UnU
try{ UMuqdLaT9
if(ps!=null) { Gvw4ot/
ps.clearParameters(); u[dR*o0'
ps.close(); Ey=(B'A~
ps=null; wIz<Y{HA=
} .a1WwI
}catch(SQLException e){} u{yENZ^P
DBUtils.closeConnection(conn); Xy:'f".M~\
} sptDzVM
} _9wX8fh3D
public long getLast(){ >XjSVRO
return lastExecuteTime; h.ojj$f,
} V03U"eI="
public void run(){ b"t95qlL
long now = System.currentTimeMillis(); pI|Lt
if ((now - lastExecuteTime) > executeSep) { s\,F6c
//System.out.print("lastExecuteTime:"+lastExecuteTime); ByoSwQ
//System.out.print(" now:"+now+"\n"); }(z[
rZ
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); #"fBF/Q
lastExecuteTime=now; /Y:&307q
executeUpdate(); RrRrB"!8nR
} mBSa*s)
else{ S)of.Nq.;
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 3t5`,R1@t
} E8zga )
} j|TcmZGO
} I4:4)V?
//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 {v+,U}
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类写好了,下面是在JSP中如下调用。 >{p&_u.r-
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<% I?LJXo \O
CountBean cb=new CountBean(); Ikql
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); :oYu+cQ
CountCache.add(cb);
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out.print(CountCache.list.size()+"<br>"); q%%8oaEI
CountControl c=new CountControl(); A(2_hl-
c.run(); '8K5=|!J
out.print(CountCache.list.size()+"<br>"); i,1=5@rw5
%>