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: Dqd2e&a\
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CountBean.java ^<
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/* Ag8lI+
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* CountData.java 1Y~'U
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* 8|5+\1!#/)
* Created on 2007年1月1日, 下午4:44 6Lg#co}9
* 3 +`,'Q9
* To change this template, choose Tools | Options and locate the template under 0V`~z-#
* the Source Creation and Management node. Right-click the template and choose ZjrBOb
* Open. You can then make changes to the template in the Source Editor. ej=}OH4
*/ :
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package com.tot.count; UDnCHGq
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/** eW}-UeT
* sN5Mm8~
* @author lZ <D,&
*/ pigu]mj
public class CountBean { SxcE@WM
private String countType; wub7w#
int countId; Be<bBKQb
/** Creates a new instance of CountData */ TD4
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public CountBean() {} 3Ljj|5.q
public void setCountType(String countTypes){ ^BW8zu@=O
this.countType=countTypes; wgq=9\+&
} wnQi5P+
public void setCountId(int countIds){ s*eM}d.p
this.countId=countIds; ")nKFs5
} Z^mQb2e.
public String getCountType(){ /BhP`a%2Q
return countType; Ke~!1S8=
} ZZfi,0R
public int getCountId(){ N.SV*G
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return countId; rL?{+S]&^)
} n0%S: (
} 3x
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CountCache.java .SSPJY(
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/* /sPa$D
* CountCache.java ]g,j
* w]N;HlU
* Created on 2007年1月1日, 下午5:01 O<dCvH
* 1W}k>t8?h'
* To change this template, choose Tools | Options and locate the template under jW[EjhsH
* the Source Creation and Management node. Right-click the template and choose fWF!% |L
* Open. You can then make changes to the template in the Source Editor. ]5MT-qU
*/ u9]M3>
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package com.tot.count; ft iAty0n
import java.util.*; Lw?>1rTT/
/** V|{~9^
* gI@nE:(m
* @author &b2@+/ F
*/ .v9i|E=<~
public class CountCache { BrZ17
public static LinkedList list=new LinkedList(); Q^?$2ck=
/** Creates a new instance of CountCache */ {?X +Yw
public CountCache() {} \\d8ulu
public static void add(CountBean cb){ RtDTcaW/
if(cb!=null){ g|4>S<uC
list.add(cb); ^?0?*
} %(s2{$3
} hl DU.k
} $d&7q5[
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CountControl.java HPo><u
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/* pNu?DF{
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* CountThread.java ,I,Zl.5
* [g+WL\1
* Created on 2007年1月1日, 下午4:57 G,(Xz"`,
* i"E_nN"V
* To change this template, choose Tools | Options and locate the template under {~ w!
* the Source Creation and Management node. Right-click the template and choose (+u&b< <6N
* Open. You can then make changes to the template in the Source Editor. `;m0GU68
*/ Z1(!syg
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package com.tot.count; jDj=a->e^
import tot.db.DBUtils; >:J1Gc
import java.sql.*; =Fq{#sC>
/** 4r7aZDVA\
* OXX D}-t
* @author t6)R37
*/ B\;fC's+
public class CountControl{ ax2#XSCO
private static long lastExecuteTime=0;//上次更新时间 ?tT89m3_E
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 FE1En
/** Creates a new instance of CountThread */ 'p%w_VbI
public CountControl() {} =H}}dC<)
public synchronized void executeUpdate(){ YC*`n3D|'
Connection conn=null; !Uhc jfq`e
PreparedStatement ps=null; -YipPo"a
try{ 0-d&R@lX.
conn = DBUtils.getConnection(); u}?{1B!
conn.setAutoCommit(false); ?b]f$
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?");
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for(int i=0;i<CountCache.list.size();i++){ '6T *b
CountBean cb=(CountBean)CountCache.list.getFirst(); 5xH*&GpL7
CountCache.list.removeFirst(); i2LN`5k
ps.setInt(1, cb.getCountId()); |(Xxi
ps.executeUpdate();⑴ HEK?z|Ne
//ps.addBatch();⑵ Y`xAJ#=
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} }j\8|UG
//int [] counts = ps.executeBatch();⑶ V9`jq$
conn.commit(); !__^M3S,k
}catch(Exception e){ mxwG~a'_
e.printStackTrace(); W,nn,%
} finally{ 1X?q4D"
try{ \PmM856=ms
if(ps!=null) { V:g XP1P
ps.clearParameters(); c&`]O\D-c
ps.close(); :"+3Uk2
ps=null; *kJa$3*r
} |Y(
}catch(SQLException e){} ,%y!F3m
DBUtils.closeConnection(conn); iX>)6)uJ
} |%(qaPA1
} =Q!V6+}nY^
public long getLast(){ Jp~[Dm
return lastExecuteTime; j?!/#'
} dmMrZ1u2
public void run(){ gLbTZM4i
long now = System.currentTimeMillis(); ~BXy)IB6
if ((now - lastExecuteTime) > executeSep) { ?.nD!S@
//System.out.print("lastExecuteTime:"+lastExecuteTime); _Vr}ipx-k
//System.out.print(" now:"+now+"\n"); ,awkL
:
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Jb8%A@Z+
lastExecuteTime=now; :QMpp}G
executeUpdate(); 6%&w\<(SG
} 8%b-.O:_$
else{ z7Z!wIzJ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); pWb8X}M
} l!}7GWj
} \F7NuG:m,
} W:2j.K9!
//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 1.a:iweN
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类写好了,下面是在JSP中如下调用。 ip*UujmNyR
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<% R~#&xfMd.
CountBean cb=new CountBean(); "
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ^3Z~RK\}
CountCache.add(cb); [?)He} _L
out.print(CountCache.list.size()+"<br>"); X>MDX.Z
CountControl c=new CountControl(); 70nBC
c.run(); M7(]NQ\TQ
out.print(CountCache.list.size()+"<br>"); )fc+B_
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