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: 8-gl$h
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CountBean.java A46dtFD{
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/* 5>dA7j^v
* CountData.java #++:`Z
* ;+DMv5A "
* Created on 2007年1月1日, 下午4:44 51%Rk,/o
* *s, bz.[
* To change this template, choose Tools | Options and locate the template under nVlZ_72d
* the Source Creation and Management node. Right-click the template and choose F.(W`H*1+
* Open. You can then make changes to the template in the Source Editor. QlVj#Jv;~
*/ 3Ch42<
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package com.tot.count; },<Y
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/** n[BYBg1yG
* {Mo[C%
* @author uD{^1c3x
*/ CVY-U|xFY
public class CountBean { D,$M$f1
private String countType; GQ85ykky
int countId; EId>%0s5
/** Creates a new instance of CountData */ Y q/vym-O5
public CountBean() {} >q')%j
public void setCountType(String countTypes){ fLRx{Nu
this.countType=countTypes; N)jNvzm
} ?&6|imPE
public void setCountId(int countIds){ ']Czn._
this.countId=countIds; 8bw,dBN
} zn'Mi:O'p
public String getCountType(){ '?90e4x3/
return countType; {OQ)Np!
} uR=*q a
public int getCountId(){ N f?\O@
return countId; s!W{ru
} {y|.y~vW
} o7gZc/?n
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CountCache.java 8\)4waz$
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/* dr8Q>(ZY
* CountCache.java >y}> 5kv
* 7u1o>a%9
* Created on 2007年1月1日, 下午5:01 iyR5mA
* g}?39?o4
* To change this template, choose Tools | Options and locate the template under <%4pvn8d?&
* the Source Creation and Management node. Right-click the template and choose sj+ )
* Open. You can then make changes to the template in the Source Editor. H>\lE2
*/ SA"4|#3>7
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package com.tot.count; 6QHUBm2
import java.util.*; daB5E<?
/** eMOp}.zt|
* _4{3^QZq5
* @author i*xVD`x ~
*/ C9Cl$yZ
public class CountCache { #BEXj<m+J
public static LinkedList list=new LinkedList(); >0 := <RW
/** Creates a new instance of CountCache */ |+-b#Sa9
public CountCache() {} ?+c-m+;wj
public static void add(CountBean cb){ 3nq4Y'
if(cb!=null){
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list.add(cb); Sw{rNzh%$
} C:!&g~{cKi
} X#W6;?Z\
} B|>eKI
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CountControl.java QVb{+`.7
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/* pB VzmQF
* CountThread.java ASS<XNP
* `)i4ZmE|
* Created on 2007年1月1日, 下午4:57 Pr/q?qZY
* ,]@Sytky
* To change this template, choose Tools | Options and locate the template under t,~feW,
* the Source Creation and Management node. Right-click the template and choose Ch=jt*0
* Open. You can then make changes to the template in the Source Editor. YyY?<<z%
*/ 47&p*=
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package com.tot.count; Sfi1bsK
import tot.db.DBUtils; ![[:Z
import java.sql.*; N]I::
/** Vvn~G.&)
* Q9g^'a
* @author BgsU:eKe
*/ Qoz4(~I
public class CountControl{ uY&t9L8
private static long lastExecuteTime=0;//上次更新时间 w!UIz[ajI
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 0b=00./o
/** Creates a new instance of CountThread */ |UQGZ
public CountControl() {} Fp+fZU
public synchronized void executeUpdate(){ |i(@1 l
Connection conn=null; 9]S;%:64
PreparedStatement ps=null; Z%{`j!!p
try{ [Z[ p@Ux
conn = DBUtils.getConnection(); 3|Y.+W
conn.setAutoCommit(false); ;%/}(&E2
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ;0dl
for(int i=0;i<CountCache.list.size();i++){ ?,r}@89pY
CountBean cb=(CountBean)CountCache.list.getFirst(); Qj9'VI>&
CountCache.list.removeFirst(); OV^?cA
ps.setInt(1, cb.getCountId()); VkC1\L6
ps.executeUpdate();⑴ ;3=RM\
//ps.addBatch();⑵ A2nL=9~
} FdxV#.BE
//int [] counts = ps.executeBatch();⑶ bL%-9BG
conn.commit(); "6WE6zq
}catch(Exception e){ &