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: z)5n&w
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CountBean.java fmie,[
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/* S>7Zq5*
* CountData.java my")/e
* uAyj##H
* Created on 2007年1月1日, 下午4:44 Pi6C1uY6
* #;juZ*I
* To change this template, choose Tools | Options and locate the template under =!xeki]|9
* the Source Creation and Management node. Right-click the template and choose O#A1)~
* Open. You can then make changes to the template in the Source Editor. S6H=(l58
*/ .Gl&K|/{j
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package com.tot.count; 8 Oeg"d
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/** eEJ8j_G
* #RJy
* @author 'O`jV0aa'
*/ ;:*o
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public class CountBean { {549&]/o
private String countType; L4sN)EI
int countId; h_ ]3L/
/** Creates a new instance of CountData */ 6K P!o
public CountBean() {} `.%;|"xR
public void setCountType(String countTypes){ ^Gv<Xl
this.countType=countTypes; sVkR7
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} XrC{{K
public void setCountId(int countIds){ {R8Q`2R
this.countId=countIds; [RD ^@~x
} !gy'_Y
public String getCountType(){ aEdFZ
return countType; <-Q0WP_^
} +,>f-kaV
public int getCountId(){ 0s0[U
return countId; 5HG 7M&_
} 4PiN Q'*
} XoSjYG(>,
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CountCache.java 0P/A
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/* w0SzK-&
* CountCache.java YO!,m<b^u
* =
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* Created on 2007年1月1日, 下午5:01 U`6QD}c"s
* i*_KHK
* To change this template, choose Tools | Options and locate the template under f'FY<ed<w
* the Source Creation and Management node. Right-click the template and choose V@>?lv(\
* Open. You can then make changes to the template in the Source Editor. NJUYeim;
*/ dGIu0\J\$
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package com.tot.count; /N%f78
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import java.util.*; uc Z(D|a
/** *"fg@B5
* @+1E|4L1vf
* @author .ET;wK
*/ d@At-Z~M
public class CountCache { NH'RU`U)
public static LinkedList list=new LinkedList(); +7 F7Kh
/** Creates a new instance of CountCache */ H.idL6*G
public CountCache() {} 'VJMi5Y(-
public static void add(CountBean cb){ gn%#2:=pVu
if(cb!=null){ Y1k/ngH
list.add(cb); {]<D"x;
} sQJM 4'8f
} qsvUJU
} 3jS=
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CountControl.java MP}H
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/* f=K1ZD
* CountThread.java :VN<,1s9p^
* Od&M^;BQ
* Created on 2007年1月1日, 下午4:57 LOnhFX
* MCh8Q|Yx4
* To change this template, choose Tools | Options and locate the template under 8~HC0o\2
* the Source Creation and Management node. Right-click the template and choose b V9Z[[\
* Open. You can then make changes to the template in the Source Editor. >.{
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*/ (X!/tw,.
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package com.tot.count; CPVKz
import tot.db.DBUtils; ''5%5(Y.r
import java.sql.*; ~Y'e1w$`
/** l42m81x"
* yFpHRfF}
* @author w|L~+
*/ /#:RYM'Tu
public class CountControl{ ?G?=,tV
private static long lastExecuteTime=0;//上次更新时间 |Y'$+[TE
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 K6Gc)jp:b
/** Creates a new instance of CountThread */ 3~cOQ%#]4
public CountControl() {} A^K,[8VX
public synchronized void executeUpdate(){ =\XAD+
Connection conn=null; 'oT}jI
PreparedStatement ps=null; SAH\'v0
try{ h.?[1hT4R
conn = DBUtils.getConnection(); "L8V!M_e
conn.setAutoCommit(false); awkVjyq X
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); \Flq8S /t^
for(int i=0;i<CountCache.list.size();i++){ Y43#];
CountBean cb=(CountBean)CountCache.list.getFirst(); LV]\{'
CountCache.list.removeFirst(); COHJJONR
ps.setInt(1, cb.getCountId()); dlT\VWMha(
ps.executeUpdate();⑴ c hd${
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//ps.addBatch();⑵ }MIH{CMH
} Q}=RG//0*
//int [] counts = ps.executeBatch();⑶ [CUJ A
conn.commit(); c%Gz{':+
}catch(Exception e){ zr[~wM
e.printStackTrace(); 9y4rw]4zI
} finally{ xS}H483h6W
try{ qLP+@wbJ
if(ps!=null) { vf=
ps.clearParameters(); <e^/hR4O
ps.close(); $"8k|^Z3
ps=null; BQU5[8l
} *X\c
$=*
}catch(SQLException e){} W.|6$hRl)
DBUtils.closeConnection(conn); LasH[:QQQ
} r$F]e]Ic\
} ;SW-dfo2i
public long getLast(){ ptR
return lastExecuteTime; ;Kf|a}m -
} XOCau.#
public void run(){ c-.>C)
long now = System.currentTimeMillis(); #H[4?4r
if ((now - lastExecuteTime) > executeSep) { _PM<25Y,@
//System.out.print("lastExecuteTime:"+lastExecuteTime); nnG2z@$-
//System.out.print(" now:"+now+"\n"); ?6QJP|kE
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); !Ia"pNDf
lastExecuteTime=now; g#4gGhI
executeUpdate(); +V@=G &Ou0
} ~Z]vr6?$h
else{ i .N1Cvp&
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); !_9$[Oq~
} h)rf6*hw
} (L>[,YO9
} UTQKlwPa
//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 HD{`w1vcN
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类写好了,下面是在JSP中如下调用。 B`scuLl3
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<% sZ"U=6R
CountBean cb=new CountBean(); [kOA+\v
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); x+cF1N2.
CountCache.add(cb); H/k W
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out.print(CountCache.list.size()+"<br>"); /6?plt&CA
CountControl c=new CountControl(); !C#RW=h9
c.run(); fmJW d|
out.print(CountCache.list.size()+"<br>"); EYxRw
%>