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: +Mm0bqNN
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CountBean.java >o>'@)I?e6
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/* 6x/ X8zu
* CountData.java Qn%*kU0X
* ! 2Y,
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* Created on 2007年1月1日, 下午4:44 L1C'V/g
* NK#Dq&W+&
* To change this template, choose Tools | Options and locate the template under ~T4=Id
* the Source Creation and Management node. Right-click the template and choose S8,+6+_7
* Open. You can then make changes to the template in the Source Editor. /e{Oqhf[n
*/ {/0,lic
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package com.tot.count; `&9#!T.
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/** Rb#Z\e}e-
* J;T_9
* @author dnIBAe
*/ s:]rL&|
public class CountBean { 6/#= dv
private String countType; dqKTF_+VhA
int countId; GF/p|I D
/** Creates a new instance of CountData */ Ca1)>1Vz
public CountBean() {} >MP PYVn7
public void setCountType(String countTypes){ ]B,S <*h
this.countType=countTypes; MzG(+B
} %] #;
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public void setCountId(int countIds){ ]-PF? 8
this.countId=countIds; f1~3y}7^Jq
} #JLDj(a?
public String getCountType(){ U<6k!Y9ny
return countType; ^c(PZ,/#JB
} ,-b{oS~u
public int getCountId(){ 9lD,aOb
return countId; UxS;m4
} QKP9*dz
} q/B+F%QiMQ
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CountCache.java 93!a
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/* _E30t( _.
* CountCache.java ?xf;#J+{8
* cLYc""=
* Created on 2007年1月1日, 下午5:01 3,F/i+@
* {!/y@/NK2
* To change this template, choose Tools | Options and locate the template under ~.@fk}'R
* the Source Creation and Management node. Right-click the template and choose j qdI=!H
* Open. You can then make changes to the template in the Source Editor. tm|lqa
*/ E%;'3Qykva
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package com.tot.count; cUm9s>^)/
import java.util.*; -pD&@Wlwak
/** 4KM$QHS5{
* | 5L1\O8#
* @author g-:)}8d6
*/ n5JB'F)
public class CountCache { LNN:GD)>
public static LinkedList list=new LinkedList(); cdfll+
/** Creates a new instance of CountCache */ G^(&B30V
public CountCache() {} 2?r8>#_*
public static void add(CountBean cb){ JyqFFZ&
if(cb!=null){ XOeh![eMX
list.add(cb); Z*TW;h0ZQ3
} z67=v9+7
} >C-_Zv<!T\
} >=`c [=:Z_
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CountControl.java $HXB !$d
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/* #VOjnc/rW
* CountThread.java %'t~e?d!
* <{U{pCT%
* Created on 2007年1月1日, 下午4:57 f~q&.,I(
* Ad,r(0a LZ
* To change this template, choose Tools | Options and locate the template under {.lF~cOu
* the Source Creation and Management node. Right-click the template and choose hY1|qp
* Open. You can then make changes to the template in the Source Editor. !U#++Zig%
*/ NDOZ!`LqH
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package com.tot.count; v2n0[b0
import tot.db.DBUtils; TN
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import java.sql.*; S[a5k;8GL
/** Z M+Hb_6f
*
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* @author .?p}:
*/ E~>6*_?
public class CountControl{ ,OKM\N,
private static long lastExecuteTime=0;//上次更新时间 ya{>=
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 nFfCw%T?
/** Creates a new instance of CountThread */ HLe^|
public CountControl() {} 3] qlz?5
public synchronized void executeUpdate(){ O8r"M8
Connection conn=null; s3M84w z
PreparedStatement ps=null; lkfFAwnc
try{ {}pqxouE
conn = DBUtils.getConnection(); s3-ktZ@
conn.setAutoCommit(false); ~B&*7Q7
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ,w%oSlOu
for(int i=0;i<CountCache.list.size();i++){ z/KZ[qH\
CountBean cb=(CountBean)CountCache.list.getFirst(); X[Ek'=}
CountCache.list.removeFirst(); iw
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ps.setInt(1, cb.getCountId()); M_1Tx
ps.executeUpdate();⑴ , Ln
//ps.addBatch();⑵ x~;EH6$5'/
} H\I!J@6g
//int [] counts = ps.executeBatch();⑶ <}
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conn.commit();
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}catch(Exception e){ *yaX:,'\$
e.printStackTrace(); B#aH\$_U
} finally{ cIr1"5POXK
try{ v{2DBr
if(ps!=null) { z"K(
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ps.clearParameters(); cHL]y0>
ps.close(); OF&h=1De,
ps=null; z9 w&uZzi
} U+;>S$
}catch(SQLException e){} Iz)hz9k
DBUtils.closeConnection(conn); T@|l@xm~L
} d>, V
} 20VVOnDY
public long getLast(){ m*!f%}T
return lastExecuteTime; ?{: D,{+
} `x UG|
public void run(){ 8*yo7q&
long now = System.currentTimeMillis(); sc8DY!|OYN
if ((now - lastExecuteTime) > executeSep) { Q0cY/'>4
//System.out.print("lastExecuteTime:"+lastExecuteTime); "XNu-_$N<a
//System.out.print(" now:"+now+"\n"); iS"8X#[]N
// System.out.print(" sep="+(now - lastExecuteTime)+"\n");
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lastExecuteTime=now; 5!AV!A_Jp
executeUpdate(); NLQE"\#a
} -~][0PVL9
else{ 9&%#nN4`8
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 7%9)C[6NSs
} >{m2E8U0
} %5h^`lp
} x=5P+_
//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 /zG+]
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类写好了,下面是在JSP中如下调用。 f]8!DXEA
] *-;' *
<% j
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CountBean cb=new CountBean(); &xiOTkqB
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); JoCA{Fa}
CountCache.add(cb); .G}k/`a
out.print(CountCache.list.size()+"<br>"); $_C+4[R?
CountControl c=new CountControl(); %X4-a%512
c.run(); ]4Y/x i-
out.print(CountCache.list.size()+"<br>"); d(fPECv(
%>