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: my4\mi6P
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CountBean.java brfKd]i
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/* >J>>\Y(p
* CountData.java lAz2%s{6
* Psp^@
* Created on 2007年1月1日, 下午4:44 .x>HA^4
* %OEq,Tb
* To change this template, choose Tools | Options and locate the template under FZH-q!"^cK
* the Source Creation and Management node. Right-click the template and choose K0v.3
* Open. You can then make changes to the template in the Source Editor. ?3Pazc]+|
*/ JA< :K0
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package com.tot.count; H }B2A"
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/** `2,a(Sk#
* LZ4xfB(
* @author 8'\~%xw
*/ Fav^^vf*1
public class CountBean { }s(C^0x
private String countType; ljuNs@q
int countId; 1TIlINlJ
/** Creates a new instance of CountData */ Ww=O=c5uOu
public CountBean() {} JdO)YlM-
public void setCountType(String countTypes){ e$32
this.countType=countTypes; Qww^P/vm
} i+1Qf
public void setCountId(int countIds){ .>wFztK
this.countId=countIds; b[yE~EQxr
} `\ R{5TU
public String getCountType(){ KxX[S.C
return countType; l=xt;c!
} ^EuW(
"
public int getCountId(){ K0oFPDJN
return countId; qF'~F`6
} 4~*Y];!Q
} Gnk|^i;t
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CountCache.java vlu$!4I
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/* VVFV8T4
* CountCache.java ZL=N[XW4'
* -~\f2'Q
* Created on 2007年1月1日, 下午5:01 L{<7.?{Y
* e"~)Utk
* To change this template, choose Tools | Options and locate the template under g Jk[Ja
* the Source Creation and Management node. Right-click the template and choose q1w|'V
* Open. You can then make changes to the template in the Source Editor. GkciA{
*/ v&r=-}z2!
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package com.tot.count; ^aHh{BQ%
import java.util.*; M%|f+u &
/** p/3BD&6
* [Y$V\h=V
* @author d/lffNS=
*/ R:f7LRF/\
public class CountCache { f1J%]g!
public static LinkedList list=new LinkedList(); r6MB"4xd
/** Creates a new instance of CountCache */ V_f`0\[x
public CountCache() {} =hGJAU
public static void add(CountBean cb){ GG+5/hU
if(cb!=null){ m!:.>y
list.add(cb); -bm,:Iy!
} AEqq1A
} y?Onb3%
} 79wLT\&
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CountControl.java as#J qE
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/* BGzO!s*@j
* CountThread.java hlC%HA
* O|7yP30?M
* Created on 2007年1月1日, 下午4:57 R6<4"?*r
* !k-` eJ|
* To change this template, choose Tools | Options and locate the template under 5VKcV&D
* the Source Creation and Management node. Right-click the template and choose A0>x9 XSkJ
* Open. You can then make changes to the template in the Source Editor. > H~6NBd5D
*/ . ,R4WA,
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package com.tot.count; SM<d
import tot.db.DBUtils; (6clq:c7j
import java.sql.*; ;'^, ,{
/** OXCQfT@\
* r0{]5JZt/
* @author yl/a:Q
*/ Ihqs%;V
public class CountControl{ c
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private static long lastExecuteTime=0;//上次更新时间 d;44;*D
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 a:b^!H>#
/** Creates a new instance of CountThread */ M(2`2-/xh
public CountControl() {} @)b^^Fp
public synchronized void executeUpdate(){ ;(S|cm'>}
Connection conn=null; r.<JDdj
PreparedStatement ps=null; K}K)`bifw
try{ UJn/s;$.e
conn = DBUtils.getConnection(); 8gI\zgS
conn.setAutoCommit(false); 5(#-)rlGj
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); s i?HkJv5
for(int i=0;i<CountCache.list.size();i++){ W>/UBN3
CountBean cb=(CountBean)CountCache.list.getFirst(); H(&Z:{L
CountCache.list.removeFirst(); t!t=|JNf{
ps.setInt(1, cb.getCountId()); 6v>z h
ps.executeUpdate();⑴ CKd3w8;
//ps.addBatch();⑵ (tKMBxQo8
} `pm>'
//int [] counts = ps.executeBatch();⑶ u|OtKq
conn.commit(); :1MMa6
}catch(Exception e){ hDvpOIUL1
e.printStackTrace(); Gkmsaf>
} finally{ gl
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try{ " '[hr$h3
if(ps!=null) { #KE;=$(S
ps.clearParameters(); @ae>b
ps.close(); %Rarr
ps=null; l"5y?jT
} )5G QJiY
}catch(SQLException e){} (3W&AM
DBUtils.closeConnection(conn); x5F@ad9
} Vhph`[dC{
} =<.F3lo\s
public long getLast(){ D:m#d.m
return lastExecuteTime; 'HB~Dbq`V
} /[?Jylj
public void run(){ 0Cq!\nzz
long now = System.currentTimeMillis(); d1bhJK
if ((now - lastExecuteTime) > executeSep) { w+=Q6]FxJ
//System.out.print("lastExecuteTime:"+lastExecuteTime); [b;Uz|o
//System.out.print(" now:"+now+"\n"); -l[jEJS}
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); (}jL_E
lastExecuteTime=now; 9I kUZW
executeUpdate(); jCQho-1QN
} K(3&27sGN
else{ P^zy; Qs7
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); A{(T'/~"
} On%,l
} )E-E0Hl>7
} YxyG\J\|,
//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 ANb"oX c
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类写好了,下面是在JSP中如下调用。 #HG&[Ywi
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<% "teyi"U+
CountBean cb=new CountBean(); X+at%L=
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); '=#5(O%pp
CountCache.add(cb); 9-93aC.|}
out.print(CountCache.list.size()+"<br>"); Ux_<d?p
CountControl c=new CountControl(); GX5W^//}
c.run(); liD47}+
out.print(CountCache.list.size()+"<br>"); gn.Ol/6D
%>