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: "ZoRZ'i
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CountBean.java dIa+K?INX
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/* a# y;dK
* CountData.java l%pu HZ)t
* Ou!2[oe@M
* Created on 2007年1月1日, 下午4:44 X0H!/SlS
* {V$|3m>:*
* To change this template, choose Tools | Options and locate the template under Qu"\wE^.`
* the Source Creation and Management node. Right-click the template and choose JG!mc7
* Open. You can then make changes to the template in the Source Editor. `maKN \;
*/
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package com.tot.count; ," Wr"
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/** >WQMqQ^t@
* NI}yVV
* @author st3l2Q
*/ wh\}d4gN
public class CountBean { Ng>5?F^v
private String countType; YY((V@|K
int countId; 7BjJhs
/** Creates a new instance of CountData */ (Hz^)5(~
public CountBean() {} ZaDyg"Tw+
public void setCountType(String countTypes){ # 448-8x
this.countType=countTypes; C] eSizS.
} 4Lh!8g=/
public void setCountId(int countIds){ eJVjuG
this.countId=countIds; B=yqW
} YpZ+n*&+
public String getCountType(){ fk[-mZ
return countType; H*QIB_
} #!qm ZN
public int getCountId(){ c~$)UND^
return countId; Y1OkkcPb{
} @+M
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} KL:j?.0
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CountCache.java {M$1N5Eh
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/* `H_ 3Uc
* CountCache.java D>@I+4{p
* |`f$tj
* Created on 2007年1月1日, 下午5:01 7 60Y$/Wz
* ?m=N]!n
* To change this template, choose Tools | Options and locate the template under #*uL)2nR
* the Source Creation and Management node. Right-click the template and choose +p_CN*10H
* Open. You can then make changes to the template in the Source Editor. dh*ZKI^@(
*/ .b&t;4q
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package com.tot.count; yAs>{6%-
import java.util.*; |zNX=mAV
/** u\x}8pn
* ='sHj4hU
* @author *@r/5pM2}
*/ 69?wc!
public class CountCache { 2c,9e`
public static LinkedList list=new LinkedList(); vNY{j7l/W
/** Creates a new instance of CountCache */ ooL!TSGD
public CountCache() {} Gg3,:A_ w
public static void add(CountBean cb){ g^2OkV(
if(cb!=null){ .E1rqB G
list.add(cb); <#y[gTJ<'>
} yZ(zdM\/sL
} gQelD6c
} ?|C2*?hZ+
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CountControl.java eRstD>r
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/* vnt%XU,,Y
* CountThread.java 5 +YH.4R
* cAqLE\h
* Created on 2007年1月1日, 下午4:57 vq0Tk
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* 2dcV"lY
* To change this template, choose Tools | Options and locate the template under E`0?
* the Source Creation and Management node. Right-click the template and choose +z\^t_"f
* Open. You can then make changes to the template in the Source Editor. 9y8&9<#
*/ S6M}WR^,
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package com.tot.count; Mj?`j_X
import tot.db.DBUtils; 4qbBc1,7y
import java.sql.*; E *6Cw
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/** k&q;JyUi
* kT66;Y[
* @author B=T'5&
*/ nH'e?>x~e
public class CountControl{ Z1f8/?`W
private static long lastExecuteTime=0;//上次更新时间 D~fl JR
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 cJ
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/** Creates a new instance of CountThread */ VUGmi]qd
public CountControl() {} ]^'Kd*x
public synchronized void executeUpdate(){ l0w]`EE
Connection conn=null; m@F`!qY~Y\
PreparedStatement ps=null; Q&ptc>{bH6
try{ x8\?}UnB
conn = DBUtils.getConnection(); JCzeXNY
conn.setAutoCommit(false); =sU<S,a*
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); D~iz+{Q4
for(int i=0;i<CountCache.list.size();i++){ -1_)LO&H
CountBean cb=(CountBean)CountCache.list.getFirst(); $q{!5-e
CountCache.list.removeFirst(); _QE qk@ql
ps.setInt(1, cb.getCountId()); x7w4[QYw
ps.executeUpdate();⑴ xY8$I6
//ps.addBatch();⑵ Al^d$FaF
} J26V nK
//int [] counts = ps.executeBatch();⑶ {n.PF8A5X
conn.commit(); :$|HNeDO
}catch(Exception e){ 9Cp-qA%t
e.printStackTrace(); )5JFfp)#
} finally{ |?xN\O^#}
try{ EIAc@$4
if(ps!=null) { M,,bf[p$
ps.clearParameters(); SrJGTuXg
ps.close(); -%CP@dAk
ps=null; Rz/gtEP
} P [ck84F/
}catch(SQLException e){} *?>T,gx}
DBUtils.closeConnection(conn); E \EsWb
} u8g~
} ~2N"#b&J
public long getLast(){ _pG-qK
return lastExecuteTime; qLG&WB
} RFc v^Xf
public void run(){ )}(^,
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long now = System.currentTimeMillis(); |O+H[;TB6
if ((now - lastExecuteTime) > executeSep) { 7`Ak)F:V
//System.out.print("lastExecuteTime:"+lastExecuteTime); h0f;F@I
//System.out.print(" now:"+now+"\n"); ~?Pw& K2
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6OIte-c
lastExecuteTime=now; [Ek7b*
executeUpdate(); o5GcpbZ3k
} :#ik. D
else{ nEy&