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: i<<NKv8;
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CountBean.java n99>oh
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/* p)}iUU2N
* CountData.java 0gNwC~IA8
* P;jl!o$
* Created on 2007年1月1日, 下午4:44 w
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* NJ8QI(^"
* To change this template, choose Tools | Options and locate the template under rg
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* the Source Creation and Management node. Right-click the template and choose 9ls<Y
* Open. You can then make changes to the template in the Source Editor. b6!?K!imT
*/ 31mY]Jve"
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package com.tot.count; oD_'8G}
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/** btb-MSkO
* {xr!H-9ZAA
* @author +:w9K!31-
*/ M@@"-dy
public class CountBean { jM1|+o*Wr
private String countType; Mj5=t:MI
int countId; s$xctIbm?,
/** Creates a new instance of CountData */ *g&[?y`UC
public CountBean() {} mJb>)bOl
public void setCountType(String countTypes){ ,c_[`q\
this.countType=countTypes; NwM =
} Ty\&ARjb 8
public void setCountId(int countIds){ w C]yE\P1
this.countId=countIds; *{:FPmDU
} #:L|-_=a
public String getCountType(){
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return countType; @TC_XU)&
} R(@7$
public int getCountId(){ l i}4d+
return countId; hf P}+on%
} dUeM+(s1
} 1R9hA7y&,/
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CountCache.java ?1}1uJMj-
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/* 69(z[opW
* CountCache.java -fVeE<[
* Hx2.2A^
* Created on 2007年1月1日, 下午5:01 >
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* j y{T=Nb
* To change this template, choose Tools | Options and locate the template under DIodQkF
* the Source Creation and Management node. Right-click the template and choose [~?LOH
* Open. You can then make changes to the template in the Source Editor. rP,i,1Ar 4
*/ 6N\~0d>5m
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package com.tot.count; K)$.0S9d
import java.util.*; 3JEH
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/** )zI<C=])"
* "t~I;%$[
* @author Xj"/6|X
*/ }q T @.
public class CountCache { =| S8.|r+
public static LinkedList list=new LinkedList(); rX%#Q\0h
/** Creates a new instance of CountCache */ %m!o#y(hD`
public CountCache() {} k=H{gt
public static void add(CountBean cb){ }b2U o&][
if(cb!=null){ tc\LK_@$/F
list.add(cb); jJ?MT#v
} ;SeDxyKG
} xT{qeHeZ9,
} lZV]Z3=p'0
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CountControl.java D; H</5#Q
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/* uCF+Mp
* CountThread.java ~ygiKsD6b
* jpZX5_o
* Created on 2007年1月1日, 下午4:57 2V/A%
* t#MU2b
* To change this template, choose Tools | Options and locate the template under kOETx
* the Source Creation and Management node. Right-click the template and choose 6g29!F`y
* Open. You can then make changes to the template in the Source Editor. NS-u,5Jt
*/ _a8^AG
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package com.tot.count; Run)E*sf
import tot.db.DBUtils; `hM`bcS
import java.sql.*; g$ZgR)q
/** N'Ywn}!js
* FT/H~|Z>
* @author dP
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*/ -WE pBt7*
public class CountControl{ )"|'=
private static long lastExecuteTime=0;//上次更新时间 3ypB~bNw
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ;"!dq)
/** Creates a new instance of CountThread */ I?J$";A
public CountControl() {} ml.l( 6A
public synchronized void executeUpdate(){ {a `kPfP
Connection conn=null; ?JzLn,&
PreparedStatement ps=null; ($7>\"+Tl
try{ {3yzC
conn = DBUtils.getConnection(); aWm0*W"(@
conn.setAutoCommit(false); kGc;j8>."
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); hZY+dHa]
for(int i=0;i<CountCache.list.size();i++){ &.an-
CountBean cb=(CountBean)CountCache.list.getFirst(); zv <,
CountCache.list.removeFirst(); W:4]-i?2
ps.setInt(1, cb.getCountId()); {G&K_~Vj
ps.executeUpdate();⑴ J;+tQ8,AP
//ps.addBatch();⑵ (03m%\
} }<uD[[FLB
//int [] counts = ps.executeBatch();⑶ LDBxw
conn.commit(); m=z-}T5y!T
}catch(Exception e){ ,@R~y
e.printStackTrace(); ,COSpq]6
} finally{ L7G':oA_`p
try{ vpvPRwJ
if(ps!=null) {
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ps.clearParameters(); #?}k0Y
ps.close(); QL-((dZ<
ps=null; SgAY/#
} ([_ls8
}catch(SQLException e){} U;i:k%Bzy
DBUtils.closeConnection(conn); szF[LRb
} NAZxM9
} F&lWO!4
public long getLast(){ M cNj TD
return lastExecuteTime; /_xwHiA
} ^.mQ~F
public void run(){ JiDX|Q<c
long now = System.currentTimeMillis(); Z=z'j8z3
if ((now - lastExecuteTime) > executeSep) { #PVgx9T=_
//System.out.print("lastExecuteTime:"+lastExecuteTime); |bi"J;y
//System.out.print(" now:"+now+"\n"); ul(1)q^
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); r5(OH3
lastExecuteTime=now; 3VCyq7B^
executeUpdate(); C;oP"K]4=
} _;yp^^S
else{ ) Y\} ,O
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); }bIEW ho
} I= x
} qe"5&