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: FLs$
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CountBean.java b~}$Ch3ymW
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/* /W)A[jR
* CountData.java =qc+sMo
* hrtz>qN
* Created on 2007年1月1日, 下午4:44 !ig&8:
* GLyPgZ`|
* To change this template, choose Tools | Options and locate the template under :^WF%X
* the Source Creation and Management node. Right-click the template and choose G~o!u8^;
* Open. You can then make changes to the template in the Source Editor. 5LB{b]w7m
*/ 3ZI7;Gw
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package com.tot.count; C6[W/,eS
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/** &:g:7l]g
* (z>t 4(%\
* @author i?Pnyi
*/ ^l|b>z"0ao
public class CountBean { B Z|A&;
private String countType; &G\mcstX
int countId; F'b%D
/** Creates a new instance of CountData */ ,#UZp\zZ*
public CountBean() {} Jr( =Y@Z'
public void setCountType(String countTypes){ 4[@YF@_=M
this.countType=countTypes; t|eH'"N%o
} EC;>-s
public void setCountId(int countIds){ Cp(2]Eb
this.countId=countIds; Nw'03Jzx_
} ;5bd<N
public String getCountType(){ itP`{[
return countType; R`cP%7K
} o(oOB
public int getCountId(){ X0u,QSt'O
return countId; q9_$&9
} 1f}(=Hv{
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CountCache.java W\k8f+Ke
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/* VwE4:/7YN
* CountCache.java HKXC=^}x'
* +q}t%K5
* Created on 2007年1月1日, 下午5:01 8^>c_%e}
* l P3|h*
* To change this template, choose Tools | Options and locate the template under Si>38vCJ*
* the Source Creation and Management node. Right-click the template and choose VFL^-tXnA^
* Open. You can then make changes to the template in the Source Editor. "vSKj/]
*/ NC%hsg^0/
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package com.tot.count; yl~_~<s6
import java.util.*; ^~;ia7V&2
/** +Cw_qS"=
* ~2"hh$
* @author qK a}O*
*/ ^;RK-)
public class CountCache { 80*hi)ux[
public static LinkedList list=new LinkedList(); b&+zAt.
/** Creates a new instance of CountCache */ \~l_w
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public CountCache() {} `SFeln{1B
public static void add(CountBean cb){ <ToBVGX
if(cb!=null){ Lj3o-@\*j
list.add(cb); h6
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} /ooGyF
} 4u6 FvN
} \;)g<TwL
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CountControl.java %hsCB
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/* =Z
* CountThread.java V ql4*OJW
* qT@h/Y
* Created on 2007年1月1日, 下午4:57 <bKtAf
* z#GZb
* To change this template, choose Tools | Options and locate the template under r%?-MGc
* the Source Creation and Management node. Right-click the template and choose +7H)s
* Open. You can then make changes to the template in the Source Editor. qh~bX
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*/ q++r\d^{
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package com.tot.count; #[#evlr=
import tot.db.DBUtils; jW\:+Taq
import java.sql.*; ;7lON-@BI
/** [yXmnrxA
* HrBJi
* @author E$)| Kv^
*/ WR)=VE
public class CountControl{ ^)Hf%
private static long lastExecuteTime=0;//上次更新时间 &J6`Q<U!
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 N&NBn(
/** Creates a new instance of CountThread */ }`B
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public CountControl() {} _]`7et\=
public synchronized void executeUpdate(){ [s>3xWZ+a
Connection conn=null; fY!?rZ)$
PreparedStatement ps=null; X_TjJmc
try{ 0SIC=p=J
conn = DBUtils.getConnection(); ETdXk&AN
conn.setAutoCommit(false); dH^6K0J
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); qNQ54#
for(int i=0;i<CountCache.list.size();i++){
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CountBean cb=(CountBean)CountCache.list.getFirst(); VI2lwE3
CountCache.list.removeFirst(); fHup&|.
ps.setInt(1, cb.getCountId()); 4!/JN J
ps.executeUpdate();⑴ /|
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//ps.addBatch();⑵ <