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: |,}E0G.
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CountBean.java P 4;{jG
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/* daOS8_py
* CountData.java >$F:*lO
* XKq@]=\F
* Created on 2007年1月1日, 下午4:44 Qa$NBNxKl
* v_sm
* To change this template, choose Tools | Options and locate the template under 7aQcP
* the Source Creation and Management node. Right-click the template and choose 7nz!0I^
* Open. You can then make changes to the template in the Source Editor. hXX1<~k
*/ 64D%_8#m
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package com.tot.count; ^t78jfl
*`KrVu 6s
/** bV3lE6z
* Yjup
* @author JfTfAq]
*/ FD6v/Y
public class CountBean { `Lz1{#F2G
private String countType; n9fk,3
int countId; "g
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/** Creates a new instance of CountData */ (G8
public CountBean() {} '8r8%XI
public void setCountType(String countTypes){ M\yHUS6N
this.countType=countTypes;
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} U1Yo7nVf
public void setCountId(int countIds){ 0yHjrxc$
this.countId=countIds; 5
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} h#{T}[
public String getCountType(){ 93I'cWN
return countType; 55hyV{L%
} GOW"o"S
public int getCountId(){ p`GWhI?
return countId; xeB4r/6
} Igjr~@#
} Ky&KF0
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CountCache.java (/fT]6(
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/* \Hs|$
* CountCache.java 5OB]x?4]
* RqGVp?
* Created on 2007年1月1日, 下午5:01 '\L0xw4
* Wg(bD,
* To change this template, choose Tools | Options and locate the template under pruWO'b`
* the Source Creation and Management node. Right-click the template and choose {NeWdC
* Open. You can then make changes to the template in the Source Editor. l.7d$8'\
*/ IIaxgfhZ
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package com.tot.count; ?f@ 9n ph
import java.util.*; .&chdVcxyS
/** kV1vb
* QV/";A3k
* @author d +xA:
*/ PEy/k.
public class CountCache { 1CiA 8
public static LinkedList list=new LinkedList(); S$K}v,8.sr
/** Creates a new instance of CountCache */ .b _? -Fv
public CountCache() {} 3G&0Ciet
public static void add(CountBean cb){ ~@YQ,\Y
if(cb!=null){ \[T{M!s
list.add(cb); .Qfnd#
} cno;>[$
} u 6(GM
} 6+Jry@
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CountControl.java =z-5
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/* A|C_np^z2
* CountThread.java N<"`ShCNM
* %|jzEBz@
* Created on 2007年1月1日, 下午4:57 /=trj5h
* 1uC;$Aj6:
* To change this template, choose Tools | Options and locate the template under ^5>du~d
* the Source Creation and Management node. Right-click the template and choose jIZ+d;1
* Open. You can then make changes to the template in the Source Editor. bx7\QU+
*/ }Eb]9c\
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package com.tot.count; fD(7FN8
import tot.db.DBUtils; .ujj:>
import java.sql.*; 'g]=.K+@}
/** mo*'"/
* `+^sW#ki
* @author 4
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*/ O8$~*NFJf
public class CountControl{ YJc%h@ _=]
private static long lastExecuteTime=0;//上次更新时间 &_YtY47
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Me<du&
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/** Creates a new instance of CountThread */ \KNdZC?V2
public CountControl() {} r!~(R+,c
public synchronized void executeUpdate(){ rV~T>x
Connection conn=null; .c: )Qli
PreparedStatement ps=null; rd|crD3
try{ (tpof
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conn = DBUtils.getConnection(); g#Mv&tU
conn.setAutoCommit(false); jPpRsw>
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); eB7>t@ED
for(int i=0;i<CountCache.list.size();i++){ &
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CountBean cb=(CountBean)CountCache.list.getFirst(); t5n2eOy~T
CountCache.list.removeFirst(); qf)C%3gXI
ps.setInt(1, cb.getCountId()); U81;7L8
ps.executeUpdate();⑴ 'X|v+?
//ps.addBatch();⑵ mHHzCKE ,
} 6I5o2i
//int [] counts = ps.executeBatch();⑶ OFIMi^@
conn.commit(); %Dra7B%
}catch(Exception e){ *i%.{ YH
e.printStackTrace(); N
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} finally{ )X~#n
try{ ^aT;aP^l
if(ps!=null) { cP,;Qbe
ps.clearParameters(); PlF!cr7:4
ps.close(); ZXh~79
ps=null;
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} KCl &H
}catch(SQLException e){} hc6.#~i
DBUtils.closeConnection(conn); @Mzz2&(dU
} ^J0zXe -d
} l`G(O$ct
public long getLast(){ =p5?+3"@
return lastExecuteTime; rQn{L{
} "NJ,0A
public void run(){ 9ptZVv=O
long now = System.currentTimeMillis(); )F
+nSV;
if ((now - lastExecuteTime) > executeSep) { fWd~-U0M^
//System.out.print("lastExecuteTime:"+lastExecuteTime); L)1C'8).
//System.out.print(" now:"+now+"\n"); W\'Nv/L
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 1Jl{1;c
lastExecuteTime=now; @uoT{E[
executeUpdate(); HRj7n<>L=
} WBy[m ?d
else{ <8g=BWA
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n");
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} L#`7 FaM?
} >kt~vJI
} {ip=iiW2
//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 #>@<n3rq
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类写好了,下面是在JSP中如下调用。 ?_8%h`z
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<% pn|p(6
CountBean cb=new CountBean(); DL
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); xQX<w\s
CountCache.add(cb); +O&RBEa[
out.print(CountCache.list.size()+"<br>"); l_bL,-|E8
CountControl c=new CountControl(); ]NbX`'
c.run(); ^=Q8]W_*
out.print(CountCache.list.size()+"<br>"); N&?T0Ge;
%>