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: 3pI)
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CountBean.java yDXW#q
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/* W,sPg\G 3
* CountData.java UWg+7RL
* <%EjrjdvL+
* Created on 2007年1月1日, 下午4:44 C+X-Cp
* 6eHw\$/
* To change this template, choose Tools | Options and locate the template under z)XIA)i6
* the Source Creation and Management node. Right-click the template and choose I=}pT50~9
* Open. You can then make changes to the template in the Source Editor.
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*/ 8PwPI%Pb
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package com.tot.count; Cy'! >
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/** 1n )&%r
* !DNk!]|
* @author LXx`Vk>ky
*/ SH#!Y
public class CountBean { ]8ob`F`m,
private String countType; P~ 7p~ke
int countId; uT2w2A;
/** Creates a new instance of CountData */ - {|
public CountBean() {} &Y|AX2KUC
public void setCountType(String countTypes){ |t&gyj
this.countType=countTypes; vFgX]&bE
} W"ldQ
public void setCountId(int countIds){ $>!tpJw
this.countId=countIds; \R (Yf!>
} vN3uLz'<
public String getCountType(){ [-'LJG Wb<
return countType; 2&d|L|->
} P_Ni
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public int getCountId(){ DS6g_SS3
return countId; +n&9ZCH
} V[baGNe
} =Z}=n S?4
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CountCache.java zTS#o#`!\
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/* Q<d|OX
* CountCache.java -Gmg&yQ9
* {'1e?
* Created on 2007年1月1日, 下午5:01 muKCCWy#
* nZ8f}R!f:
* To change this template, choose Tools | Options and locate the template under ZIikDih1
* the Source Creation and Management node. Right-click the template and choose A,#a?O6m
* Open. You can then make changes to the template in the Source Editor. +o^sm '$
*/ UJhUb)}^
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package com.tot.count; 31=vUS
import java.util.*; _&|<(m&."
/** %r >Y)@$Vt
* X8212[7
* @author N4[^!}4
*/ `}|$eF&
public class CountCache { `as6IMqJD
public static LinkedList list=new LinkedList(); Z}s56{!.
/** Creates a new instance of CountCache */ T@x_}a:g
public CountCache() {} <n{-&;>
public static void add(CountBean cb){ ;LE9w^>^V
if(cb!=null){ >}'WL($5U
list.add(cb); W@FRKDixG
} tB==v{t
} `g!NFp9q
} Tmr%r'i3
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CountControl.java Yi+$g
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/* 8bI;xjK^Q
* CountThread.java e<1)KqG
* +je{%,*
* Created on 2007年1月1日, 下午4:57 @]xHt&j
* drK &
* To change this template, choose Tools | Options and locate the template under @'fWS^ ;&
* the Source Creation and Management node. Right-click the template and choose MZK%IC>
* Open. You can then make changes to the template in the Source Editor. ZAa:f:[#f
*/ KW-g $Ma
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package com.tot.count; >[a&,gS
import tot.db.DBUtils; fe$O Pl~
import java.sql.*; Ch,%xs.)G
/** m(eR Wx&pZ
* Bl!R
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* @author DfV'1s4y
*/ >{@:p`*
public class CountControl{ {u{8QKeC
private static long lastExecuteTime=0;//上次更新时间 jz"-E
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `d6,]'
/** Creates a new instance of CountThread */ .:V4>
public CountControl() {} [|{m/`8C
public synchronized void executeUpdate(){ *>8Y/3Y\B
Connection conn=null; =%ZR0cWPoI
PreparedStatement ps=null; [2Ot=t6]
try{ D;QV`Z%I
conn = DBUtils.getConnection(); v!77dj 6I
conn.setAutoCommit(false); 85 <%L:EC
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); /Ym!%11`
for(int i=0;i<CountCache.list.size();i++){ |+r5D4]e
CountBean cb=(CountBean)CountCache.list.getFirst(); -5TMV#i
{
CountCache.list.removeFirst(); T
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ps.setInt(1, cb.getCountId()); TU}./b@F
ps.executeUpdate();⑴ 2"C,u V@F!
//ps.addBatch();⑵ I4%25=0?
} ]#t5e>o|
//int [] counts = ps.executeBatch();⑶ p4M7BK:nf
conn.commit(); 0D:e P``
}catch(Exception e){ iyr'9BA
e.printStackTrace(); Sxg&73;ZV
} finally{ hsZ}FLStJ
try{ qS}pv
if(ps!=null) { )3A%Un#B
ps.clearParameters(); -VP da @@w
ps.close(); Z&j?@k,k
ps=null; |VE*_ G
} L$4nbOu\~
}catch(SQLException e){} m0_B[dw
DBUtils.closeConnection(conn); 3P[u>xE
} cu#s}*Ip
} Ye"#tCOEG
public long getLast(){ 5x1_rjP$|
return lastExecuteTime; "R9^X3;
} {u_2L_
public void run(){ 19#A7
long now = System.currentTimeMillis(); HC\\w-`<
if ((now - lastExecuteTime) > executeSep) { k}$k6Sr"
//System.out.print("lastExecuteTime:"+lastExecuteTime); l5fF.A7TT
//System.out.print(" now:"+now+"\n"); nk^-+olm
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); bdz&"\$X
lastExecuteTime=now; ~u+|NtF
executeUpdate(); #uHl
} |cd=7[B
else{ ug.'OR
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); os~}5QJ
} KM jnY2
} 6kM'f}t[C
} ;gmfWHB<
//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 Y%A
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类写好了,下面是在JSP中如下调用。
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<% l<YCX[%E
CountBean cb=new CountBean(); ?)V}_%fVv
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); yNkE>
CountCache.add(cb); kFsq23Ne
out.print(CountCache.list.size()+"<br>"); U**v'%{s
CountControl c=new CountControl(); 4C[n@p2
c.run(); hDc)\vzr
out.print(CountCache.list.size()+"<br>"); [tY+P7j9)
%>