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: ,82?kky
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CountBean.java 9Y# vKb{>
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/* !_o1;GzK
* CountData.java 2V9"{F?
* !h1|B7N
* Created on 2007年1月1日, 下午4:44 =}0>S3a.7
* \@ZD.d#
* To change this template, choose Tools | Options and locate the template under q,Nqv[va
* the Source Creation and Management node. Right-click the template and choose P6^\*xkMr
* Open. You can then make changes to the template in the Source Editor. ='eQh\T)
*/ wjID*s[
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package com.tot.count; 2+(SR.oGq
/6N!$*8
/** )J\
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* $Ovq}Rexc
* @author K^AIqL8
*/ 8.`5"9Vh
public class CountBean { <3k9 y^0
private String countType; \@6w;tyi
int countId; B$97"$#u
/** Creates a new instance of CountData */ !qs~j=;y3
public CountBean() {} LGRhCOP:
public void setCountType(String countTypes){ G
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this.countType=countTypes; :NwFJc
} P]4u`&
public void setCountId(int countIds){ 14-uy.0[
this.countId=countIds; @DR?^
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} )lx;u.$4
public String getCountType(){ Q?m= a0g
return countType; rJd-e96
} F+Hmp\rM#
public int getCountId(){ [ dVRVm0N
return countId; m<4tH5};d
} W6*5e{
} z{>
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CountCache.java P'5Q}7
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/* 8`w#)6(V
* CountCache.java #)%dG3)e
*
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* Created on 2007年1月1日, 下午5:01 Qo["K}Ty
* a,*|*Cv
* To change this template, choose Tools | Options and locate the template under /EM=!@ka
* the Source Creation and Management node. Right-click the template and choose 5=_))v<Tp
* Open. You can then make changes to the template in the Source Editor. 'khhn6itA
*/ N*hx;k9
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package com.tot.count; s)~H_,
import java.util.*; /$ueLa
/** 6k\8ulHw
* 7LW%:0
* @author $xj>j
*/ v.H@Ey2
public class CountCache { hKK"D:?PRs
public static LinkedList list=new LinkedList(); "g;}B"rG
/** Creates a new instance of CountCache */ {f%x8t$
public CountCache() {} a*@4W3;7
public static void add(CountBean cb){ /{X2:g {
if(cb!=null){ pXxpEv
list.add(cb); #J
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} pB]+c%\
} -+|{#cz
} '%A*Z,f
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CountControl.java O:O
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/* v/7iu*u
* CountThread.java F,
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* dr7ry"5Zq
* Created on 2007年1月1日, 下午4:57 ?pF uV`Zm
* }W R?n
* To change this template, choose Tools | Options and locate the template under ;=ERm=
* the Source Creation and Management node. Right-click the template and choose {W# VUB
* Open. You can then make changes to the template in the Source Editor. #]o#~:S=
*/ Jro%zZle
1|\/2
package com.tot.count; M6b6lhg
import tot.db.DBUtils; )eSD5hOI)
import java.sql.*; z2A1h!Me
/** 1:iT#~n
* ?`D/#P
* @author XF N4m #
*/ V\o&{7!
public class CountControl{ 0j|JyS:}G
private static long lastExecuteTime=0;//上次更新时间 w!^{Q'/,Q
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Bso3Z ^X.
/** Creates a new instance of CountThread */ 5PCKBevV
public CountControl() {} +q3E>K9a
public synchronized void executeUpdate(){ Wd_KZ}lX
Connection conn=null; lAPvphO
PreparedStatement ps=null; L9)nRV8
try{ vb Mv8Nk
conn = DBUtils.getConnection(); ];o[Yn'>o
conn.setAutoCommit(false); ~~'UQnUN4
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); zc#aQ.
for(int i=0;i<CountCache.list.size();i++){ 5S?+03h~
CountBean cb=(CountBean)CountCache.list.getFirst(); [S!_ubP5
CountCache.list.removeFirst(); )o8]MWT\;
ps.setInt(1, cb.getCountId()); pO_L,~<
ps.executeUpdate();⑴ G+xdh
//ps.addBatch();⑵ )`.'QW
} qB IKJ
//int [] counts = ps.executeBatch();⑶ ?KfV>.()
conn.commit(); uCNi&.
}catch(Exception e){ 5}t}Wc8
e.printStackTrace(); (>\w8]
} finally{ ww"HV;i
try{ -F| C6m!
if(ps!=null) { :Vf :_;
ps.clearParameters(); PKM8MYvo
ps.close(); 9Iod[ x
ps=null; ]1
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} r|tTDKGQ
}catch(SQLException e){} XZFM|=%X
DBUtils.closeConnection(conn); _7"G&nZ0
} Pb^Mc <j
} ("L&iu\`@
public long getLast(){ Bzw!,(u/
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return lastExecuteTime; n++L
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} yqw#= fy
public void run(){ Zxwcj(d
long now = System.currentTimeMillis(); IaLCWvHX
if ((now - lastExecuteTime) > executeSep) { #A2)]XvY
//System.out.print("lastExecuteTime:"+lastExecuteTime); jQiKof>
//System.out.print(" now:"+now+"\n"); +5+?)8Ls
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); u/BCl!`
lastExecuteTime=now; }vbs6u
executeUpdate(); s"
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} o4"7i 9+g
else{ M1/Rba Q
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); }QL 2#R
} 8&"@6/)[
} WU
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} 75LIQ!G|=
//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 /i#~#Bn|
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类写好了,下面是在JSP中如下调用。 T.sib&R
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<% (hn@+hc
CountBean cb=new CountBean(); 6:(*u{
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Iu`xe
CountCache.add(cb);
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out.print(CountCache.list.size()+"<br>"); S6r$n
CountControl c=new CountControl(); bI,gNVN=
c.run(); ;U=RV&
out.print(CountCache.list.size()+"<br>"); .'y]Ea
%>