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: ]*=4>(F[
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CountBean.java 1@|+l!rYF
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/* 3uuIISK
* CountData.java m{Q
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* @"7S$@cO
* Created on 2007年1月1日, 下午4:44 bT,_=7F
* ?\o~P
* To change this template, choose Tools | Options and locate the template under pkn^K+<n,
* the Source Creation and Management node. Right-click the template and choose cwmS4^zt8
* Open. You can then make changes to the template in the Source Editor. ~XOmxz0
*/ v #+ECx
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package com.tot.count; 8<L{\$3HP|
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/** n\ "6ol}>E
* c~R'`Q
* @author Xd(^7~i
*/ RDdnOzx
public class CountBean { Ev7.!
private String countType; ,\M77V
int countId; Y^+x<
/** Creates a new instance of CountData */ K0gQr.J53
public CountBean() {} ]X6<yzu&+l
public void setCountType(String countTypes){ p\&O;48=
this.countType=countTypes; 4LTm&+(5
} %,T*[d&i
public void setCountId(int countIds){ ;iKLf~a a
this.countId=countIds; '7?Y+R@|L
} x%EGxs;>^
public String getCountType(){ vJ&_-CX
return countType; k'o[iKlu
} (ghI$oH
public int getCountId(){ 1B;2 ~2X
return countId; RcYUO*
} A*OqUq/H`;
} .iy4
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CountCache.java pAy4%|(
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/* c""&He4zp
* CountCache.java vG_R( ]d
* \;&;K'
* Created on 2007年1月1日, 下午5:01 'zYS:W
* MJGT|u8O&
* To change this template, choose Tools | Options and locate the template under wMVUTm
* the Source Creation and Management node. Right-click the template and choose 91]|4k93
* Open. You can then make changes to the template in the Source Editor.
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*/ +9Tc.3vQ
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package com.tot.count; pCE
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import java.util.*; KuP#i]Na
/** \GL] I.
* 5Y *4a%"
* @author 6|eqQ+(A
*/ Tw-NIT)
public class CountCache { WGv 47i
public static LinkedList list=new LinkedList(); |]< 3cW+
/** Creates a new instance of CountCache */ ~[Tcl
public CountCache() {} GQbr}xX.#
public static void add(CountBean cb){ J+P<zC
if(cb!=null){ tW UI?\
list.add(cb); <wSJK
} @vl$[Z|
} !8G)`'
} NVMn7H}>
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CountControl.java M@.l#
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/* H^-Y]{7
* CountThread.java :+"4_f0
* ;oOTL'Vu
* Created on 2007年1月1日, 下午4:57 4t[7lL`Z
* l2LQV]l
* To change this template, choose Tools | Options and locate the template under E+ /Nicn=
* the Source Creation and Management node. Right-click the template and choose tc'iKJ5)
* Open. You can then make changes to the template in the Source Editor. x$d[Ovw-
*/ h?xgOb!4
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package com.tot.count; )k(K/m
import tot.db.DBUtils; __g?xw
import java.sql.*; 1
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/** )-4c@
* MZt#T+b
* @author UVw^t+n
*/ TanWCt4r
public class CountControl{ ZO%^r%~s
private static long lastExecuteTime=0;//上次更新时间 5k0iVpjQ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 _m9k2[N!
/** Creates a new instance of CountThread */ "B3jq^
public CountControl() {} AY52j
public synchronized void executeUpdate(){ i6#*y!3{
Connection conn=null; SMZ*30i
PreparedStatement ps=null; 1X)#iY
try{ Tksv7*5$
conn = DBUtils.getConnection(); d_`MS@2
conn.setAutoCommit(false); rnK]3Ust
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); C98F?uo%Q
for(int i=0;i<CountCache.list.size();i++){ )]fiyXA
CountBean cb=(CountBean)CountCache.list.getFirst(); -YQh
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CountCache.list.removeFirst(); b\"F6TF:
ps.setInt(1, cb.getCountId()); 6:2* <
ps.executeUpdate();⑴ "pO
//ps.addBatch();⑵ {?yVA
} ^Gd1T
//int [] counts = ps.executeBatch();⑶ %r[`HF>
conn.commit(); O&7.Ry
m
}catch(Exception e){ ;{I9S'
e.printStackTrace(); @}q, ';H7
} finally{ li%@HdA!
try{ 0cmd +`
if(ps!=null) { Nr*l3Z>LD
ps.clearParameters();
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ps.close(); "pDU v^ie
ps=null; ;T^s&/>E
} Ic&~iqQ
}catch(SQLException e){} i*|HN"!
DBUtils.closeConnection(conn); @|:fm()
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} ^|MS2'
} *)Pm
public long getLast(){ ('7?"npd
return lastExecuteTime; "bej#'M#
} +<\LY(o
public void run(){ I%.nPOQ 8
long now = System.currentTimeMillis(); P*"c!Dn
if ((now - lastExecuteTime) > executeSep) { "_UnN}Uk
//System.out.print("lastExecuteTime:"+lastExecuteTime); XNa{_3v
//System.out.print(" now:"+now+"\n"); z-
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 1`?o#w
lastExecuteTime=now; j&
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executeUpdate(); r%;|gIky
} Y7S1^'E
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else{ ^KbR@Ah
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Vs"b
} N_g=,E=U%
} C
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} 4S42h_9
//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 $'\kK,=
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类写好了,下面是在JSP中如下调用。 m@<,bZkl
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<% G+=Gc(J
CountBean cb=new CountBean(); bg|$1ue
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); j*QdD\)
CountCache.add(cb); S5JMt;O
out.print(CountCache.list.size()+"<br>"); )L&y@dy)
CountControl c=new CountControl(); w
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c.run(); |r+ x/,2-
out.print(CountCache.list.size()+"<br>"); 4]1/{</B|
%>