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: sR>>l3H
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CountBean.java Zi+F IQ(
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/* :wXiz`VH
* CountData.java %J9u?-~
* !-^oU"
* Created on 2007年1月1日, 下午4:44 u"V,/1++\
* KpLaQb
* To change this template, choose Tools | Options and locate the template under q[W6I9
* the Source Creation and Management node. Right-click the template and choose Khi;2{`
* Open. You can then make changes to the template in the Source Editor. 6E
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*/ t0e5L{ QJ
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package com.tot.count;
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/** 2t_g\Q
* l+>Y
* @author !;h&@LXG(
*/ {l!{b1KJ
public class CountBean { h)ZqZ'k$
private String countType; jT$J~MpHh
int countId; 6xtgnl#T
/** Creates a new instance of CountData */ 89^g$ ac
public CountBean() {} pTG[F
public void setCountType(String countTypes){ ^.iRU'{
this.countType=countTypes; @ Do.Wgt
} O50<h O]l
public void setCountId(int countIds){ \V!{z;.fA
this.countId=countIds; 8..|-<w
} J^yqu{
public String getCountType(){ 4gC(zJ
return countType; @O'NJh{D`
} U)Hc7%
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public int getCountId(){ X>yDj]*4P
return countId; (wq8[1Wzup
} poW%F zj
} d]E={}qo&
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CountCache.java f4\$<g/~
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/* TMY. z
* CountCache.java 95~bM;TVr
* y3b"'-%
* Created on 2007年1月1日, 下午5:01 m4oj1h_4
* ]tT=jN&(
* To change this template, choose Tools | Options and locate the template under y[85eM
* the Source Creation and Management node. Right-click the template and choose qQ^CSn98J
* Open. You can then make changes to the template in the Source Editor. =|aZNHqH
*/ `<d.I%}
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package com.tot.count; G!sfp}qW
import java.util.*;
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/** D
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* @author x$` lQ%
*/ $Z]@N
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public class CountCache { !`H{jwH
public static LinkedList list=new LinkedList(); /"st
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/** Creates a new instance of CountCache */ R|(X_A
public CountCache() {} NYP3u_
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public static void add(CountBean cb){ 1c#\CO1l
if(cb!=null){ \9OKf|#j
list.add(cb); \RR`
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} A32Sdr'D
} ?2da6v,t
} R|8L'H+1x
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CountControl.java UakVmVN/P
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/* )#i"hnYpQ
* CountThread.java %i3[x.M
* %.f%Q?P
* Created on 2007年1月1日, 下午4:57 X$\CC18
* mxF+Fp~
* To change this template, choose Tools | Options and locate the template under J5Zz*'av'
* the Source Creation and Management node. Right-click the template and choose 6M7GPHah
* Open. You can then make changes to the template in the Source Editor. $8U$.~v
*/ m-\_L=QzM
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package com.tot.count; CSoVB[vS
import tot.db.DBUtils; KzV|::S^
import java.sql.*; rQ _cH
/** z(Uz<*h8
* )8g&lyT
* @author =dHdq D
*/ h%u!UHA
public class CountControl{ +JC"@
private static long lastExecuteTime=0;//上次更新时间 `3ha~+Goo!
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 9-{ +U,3)
/** Creates a new instance of CountThread */ aWRi`poZT
public CountControl() {} @0PWbs$
public synchronized void executeUpdate(){ ?'a>?al%>
Connection conn=null; u(8{5"C
PreparedStatement ps=null; ^.)0O3oC
try{ oqh@(<%
conn = DBUtils.getConnection(); 5<`83;R9
conn.setAutoCommit(false); qzvht4
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); QeFt
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for(int i=0;i<CountCache.list.size();i++){ (n.IK/:
CountBean cb=(CountBean)CountCache.list.getFirst(); iOhX\@&
CountCache.list.removeFirst(); ga\s5
ps.setInt(1, cb.getCountId()); \F`>zY2$%
ps.executeUpdate();⑴ FIfLDT+ Wh
//ps.addBatch();⑵ ~E8/m_> rU
} 3]9wfT%d
//int [] counts = ps.executeBatch();⑶ ,7s+-sRG
conn.commit(); ZG1TRF "
}catch(Exception e){ ^pu8\K;~
e.printStackTrace(); QQN6\(;-
} finally{ Wd!Z`,R
try{
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if(ps!=null) { k=kkF"
ps.clearParameters(); q:M'|5P
ps.close(); D`[@7$t
ps=null; nM&