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: ,s81rJ-
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CountBean.java 't ;/,+:V
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/* q8tug=c
* CountData.java {5.?'vMp
* !g/_w
* Created on 2007年1月1日, 下午4:44 T-!|l7V~f
* pfNThMf
* To change this template, choose Tools | Options and locate the template under 1W7
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* the Source Creation and Management node. Right-click the template and choose 6(sfpK'
* Open. You can then make changes to the template in the Source Editor. ?e2Y`0
*/ 7t+]z)
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package com.tot.count; /gF]s_
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/** $1=v.'Y
* 5?)}F/x
* @author h!~|6nj
*/ p+5#dbyr
public class CountBean { %rX\
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private String countType; [L)V(o)v
int countId; Z%A<#%
/** Creates a new instance of CountData */ ":z@c,
public CountBean() {} Xe> ~H4I9
public void setCountType(String countTypes){ a1_o.A
this.countType=countTypes; AF
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} Q!M sy<v
public void setCountId(int countIds){ >sB=\
this.countId=countIds; +*Q9.LjV
} [)bz6\d[
public String getCountType(){ 0sY#MHPT&
return countType; P[6dTZ!\s
} #C'o'%!(
public int getCountId(){ 0n7HkDo
return countId; ^M"HSewo
} n9w j[t1/
} FBE @pd
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CountCache.java dUUPhk0
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/* E^'C" 6
* CountCache.java ^JiaR)#r
* i"ck`6v"8
* Created on 2007年1月1日, 下午5:01 C-_w]2MM
* aB7d(
* To change this template, choose Tools | Options and locate the template under _TV2)
* the Source Creation and Management node. Right-click the template and choose upZYv~Sa
* Open. You can then make changes to the template in the Source Editor. pC55Ec<
*/ lxr@[VQ
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package com.tot.count; l6yB_M
import java.util.*; U3(L.8(sA
/** 8rnb
* )sMAhk|
* @author AW]("pt
*/ \>w@=bq26
public class CountCache { EgkZ$ah
public static LinkedList list=new LinkedList(); Y^T-A}?`
/** Creates a new instance of CountCache */ s}z(|IrH
public CountCache() {} B6^w{eXN
public static void add(CountBean cb){ <7@mg/T
if(cb!=null){ x Q@&W;
list.add(cb); p]X!g
} xuw//F
} <x.]OZgO
} EXv\FUzo
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CountControl.java l;.[W|
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/* ~Q3WBOjn
* CountThread.java }6yxt9
* #J'Z5)i|
* Created on 2007年1月1日, 下午4:57 D>,$c
* 2{jtQlc
* To change this template, choose Tools | Options and locate the template under =k[(rvU3
* the Source Creation and Management node. Right-click the template and choose ]Hv*^Bak
* Open. You can then make changes to the template in the Source Editor. (UbR%A|v;
*/ Q-H=wJ4R
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package com.tot.count; )&g2D@+{
import tot.db.DBUtils; 9`hpa-m@
import java.sql.*; \H"/2o%l")
/** Oi+Qy[y2
* bdNY 7|j`
* @author g: H[#I
*/ P\ Pc/[
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public class CountControl{ ~2;&pZ$
private static long lastExecuteTime=0;//上次更新时间 ,.1&Ff)S
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 S5YDS|K
/** Creates a new instance of CountThread */ A`+(VzZgJ
public CountControl() {} 7%~VOB
public synchronized void executeUpdate(){ Bh.6:9{
Connection conn=null; '_Hb}'sFI
PreparedStatement ps=null; ORFr7a'K
try{ !>"INmz
conn = DBUtils.getConnection(); f@,hO5h(_|
conn.setAutoCommit(false); >TH-Q[
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); OsHkAI
for(int i=0;i<CountCache.list.size();i++){ PW~cqo B71
CountBean cb=(CountBean)CountCache.list.getFirst(); .q~,.yI&j
CountCache.list.removeFirst(); & y 2GQJE
ps.setInt(1, cb.getCountId()); }lrfO_
ps.executeUpdate();⑴ bUZ&}(/
//ps.addBatch();⑵ [hvig$L
} &</@0
//int [] counts = ps.executeBatch();⑶ C {H'
conn.commit(); sf|_2sI
}catch(Exception e){ D8<0zxc=(
e.printStackTrace(); kW7&~tX
} finally{ k~W;TCJs
try{ 10QNV=yK7s
if(ps!=null) { */fs.G:P
ps.clearParameters(); D7n&9Z
ps.close(); QWIOim-
ps=null; 7Vof7Y <
} @EH4N%fH
}catch(SQLException e){} Z7k1fv:S^
DBUtils.closeConnection(conn); >cU*D:
} 4G68WBT
}
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public long getLast(){ =Un 6|]
return lastExecuteTime; &<[]X@ bY
} qjdahVY
public void run(){ &p(*i@Ms
long now = System.currentTimeMillis(); qH}62DP3
if ((now - lastExecuteTime) > executeSep) { R`<{W(J;r
//System.out.print("lastExecuteTime:"+lastExecuteTime); lD+y,";
//System.out.print(" now:"+now+"\n"); BGk<NEzH
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 2EI m
lastExecuteTime=now; {f6A[ZO; J
executeUpdate(); ^LQ lfd
} )H=[NB6J8
else{ 'f$?/5@@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); [W7\c;Do
} S+bWD7
} CUTEp/+
} SgQmYaa&
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 LI5cUCl
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类写好了,下面是在JSP中如下调用。 d$G%F $BTs
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<% C[/Uy
CountBean cb=new CountBean(); =kZwB*7
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); HS|g
CountCache.add(cb); P\G C8KV]
out.print(CountCache.list.size()+"<br>"); WZy6K(18"'
CountControl c=new CountControl(); 13NS*%~7[
c.run(); pC?1gc1G
out.print(CountCache.list.size()+"<br>"); ~wd?-$;070
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