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: qe<aJn
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CountBean.java f'?FYBL
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/* <b#1L
* CountData.java @Z2^smf
* o4F(X0
* Created on 2007年1月1日, 下午4:44 ALXie86a8
* 7w51UmO
* To change this template, choose Tools | Options and locate the template under P}8cSX9
* the Source Creation and Management node. Right-click the template and choose R;3nL[{U
* Open. You can then make changes to the template in the Source Editor. ^bG91"0A
*/ !@3"vd{^
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package com.tot.count; Ev>P|kV&A
@
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/** 'B yB1NL
* It:,8
* @author 6%L#FSI
*/ !j%MN{#a
public class CountBean { 51-@4E2:l:
private String countType; kr>4%Ndm7
int countId; 92XG|CWX
/** Creates a new instance of CountData */ oF L7dL
public CountBean() {} r@u8QhD
public void setCountType(String countTypes){ i#bcjH
this.countType=countTypes; eY\w?pT2
} '@dk3:3t
public void setCountId(int countIds){ >yf}9Zs
this.countId=countIds; ~`X$bF
} x,M8NTb*
public String getCountType(){ TY;%nT
return countType; 7 >-(g+NF!
} W:8pmI
public int getCountId(){ i[/`9 AK
return countId; z07Xj%zX9
} i62GZeE
} PvB{@82
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CountCache.java {R8)DK
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/* 9%Qlg4~<s
* CountCache.java V
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* OF/hD2V
* Created on 2007年1月1日, 下午5:01 [P*zm 8b
* &oxHVZJ
* To change this template, choose Tools | Options and locate the template under ~$d(@T&
* the Source Creation and Management node. Right-click the template and choose N$N7aE$
* Open. You can then make changes to the template in the Source Editor. %E2V$l0
*/ d.$0X/0
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package com.tot.count; oy\U\#k
import java.util.*; .<4U2h
/** Qz4Do6#y
* T/234;Uf|
* @author 9m%2&fjK^
*/ @%BsQm
public class CountCache { 4^T_" W}
public static LinkedList list=new LinkedList(); P,@/ap7J
/** Creates a new instance of CountCache */ "7J38Ej\
public CountCache() {} ZRj/lQ2D
public static void add(CountBean cb){ ^cCNQS}r
if(cb!=null){ S$ n?
list.add(cb); m:6*4_!
} \+j:d9?
} ),J6:O&
} +CN!3(r
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CountControl.java M>d^.n
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/* _B0C]u3D
* CountThread.java aC94g7)`
* |7QSr!{_
* Created on 2007年1月1日, 下午4:57 ~S\,
* xnxNc5$oE
* To change this template, choose Tools | Options and locate the template under Rxlz`&
* the Source Creation and Management node. Right-click the template and choose EY^?@D_<
* Open. You can then make changes to the template in the Source Editor. $8}'h
*/ gg/2R?O]
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package com.tot.count; G=er0(7<
import tot.db.DBUtils; RFPcH8-u7
import java.sql.*; Vsr"W@k_
/** fJ=v?
* *!pn6OJ"Q}
* @author OwPXQ 3S
*/ Jl<pWjkZZ
public class CountControl{ P*n/qj8h
private static long lastExecuteTime=0;//上次更新时间 o8Yq3N +
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 G
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/** Creates a new instance of CountThread */ 1zgM$p
public CountControl() {} ;3XOk+
public synchronized void executeUpdate(){ 6)c-s|#
Connection conn=null; {YG qa$+\
PreparedStatement ps=null; p'A43
try{ wLzV#8>
conn = DBUtils.getConnection(); VTwQD"oB
conn.setAutoCommit(false); !j%uwje\
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); U/-k'6=M
for(int i=0;i<CountCache.list.size();i++){
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CountBean cb=(CountBean)CountCache.list.getFirst(); |K" nSXzk
CountCache.list.removeFirst(); DMOP*;Uk
ps.setInt(1, cb.getCountId()); UF$O@l
ps.executeUpdate();⑴ "7eL&
//ps.addBatch();⑵ g7{:F\S
} dQ_hlx!J
//int [] counts = ps.executeBatch();⑶ (|>rDk;
conn.commit(); -A@/cS%p
}catch(Exception e){ Tgl >
e.printStackTrace(); PS8^=
} finally{
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try{ \OXQ%J2v
if(ps!=null) { eD8e0
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ps.clearParameters(); gVrfZ&XF84
ps.close(); !hjF"Pa
ps=null; KciN"g|X
} yb,X
}"Et
}catch(SQLException e){} BS
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DBUtils.closeConnection(conn); ~~=]_lwyK%
} virt[5w
} Ahc9HA2
public long getLast(){ o=6 <?v7
return lastExecuteTime; 6Yc(|>b!
} z,bK.KFSs
public void run(){ Z1Qv>@u
long now = System.currentTimeMillis(); "dT"6,
if ((now - lastExecuteTime) > executeSep) { $ w+.-Tr
//System.out.print("lastExecuteTime:"+lastExecuteTime); z{&