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: Y%$@ZYW
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CountBean.java "wwAbU<
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/* n/]w!
* CountData.java -QPM$
* ,zXP,(x
* Created on 2007年1月1日, 下午4:44 Yvmo%.oU
* Z/
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* To change this template, choose Tools | Options and locate the template under zt,Tda4Y
* the Source Creation and Management node. Right-click the template and choose %*:X
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* Open. You can then make changes to the template in the Source Editor. Qk`ykTS!
*/ "^gV.
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package com.tot.count; d OG]Yjc
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/** 4S9hz
* |aWeo.;c
* @author v$n J$M&k
*/ pk>p|q
public class CountBean { I7=g8/JD
private String countType; u
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int countId; vH[G#A~4
/** Creates a new instance of CountData */ {Tr5M o
public CountBean() {} ko7*9`
public void setCountType(String countTypes){ [l`_2{:
this.countType=countTypes; ^jph"a C
} ;7/
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public void setCountId(int countIds){ Wnf3[fV6P
this.countId=countIds; gC/~@Z8W]
} yiT)m]E
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public String getCountType(){ TK! D=M
return countType; 5Yxs_t4
} &PE/\_xD_
public int getCountId(){ 85{2TXQ^%=
return countId; .@5RoD[o
} \+9~\eeXb
} |M;tAG$,"y
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CountCache.java 76'@}wNnw
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/* aB$xQ|~
* CountCache.java mKTa.
* k_,wa]ws$
* Created on 2007年1月1日, 下午5:01 <]w(1{q(
* 7NQ@q--3s
* To change this template, choose Tools | Options and locate the template under ]'"aVGqa.
* the Source Creation and Management node. Right-click the template and choose 5u:{lcC.X
* Open. You can then make changes to the template in the Source Editor. 'L k&iph
*/ ( M$2CL
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package com.tot.count; !EwL"4pPw
import java.util.*; #E'aa'P}
/** (9!/bX<
* %B#(d)T*-
* @author jsp)e=
*/ 7RpAsLH=
public class CountCache { U07G&?/
public static LinkedList list=new LinkedList(); tJ qd
/** Creates a new instance of CountCache */ xPcH]Gs^b
public CountCache() {} J$+K't5BZ
public static void add(CountBean cb){ 03)R_A
if(cb!=null){ )NjxKSiU@
list.add(cb); $ap6Vxjr
} ",O}{z
} P&g.%8b~84
} n1E^8[~'
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CountControl.java L/+KY_b:*
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/* B*
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* CountThread.java q@@C|oqEX
* P}2waJe
* Created on 2007年1月1日, 下午4:57 [(81-j1v
* gK%^}xU+
* To change this template, choose Tools | Options and locate the template under H)@f_pfj(
* the Source Creation and Management node. Right-click the template and choose qX_(
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* Open. You can then make changes to the template in the Source Editor. <H]1 6
*/ ,suC`)R
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package com.tot.count; rn8#nQ>QZ%
import tot.db.DBUtils; sI,S(VWor
import java.sql.*; :~PzTUz
/** cD 5^mxd%
* lFZ}.
* @author 6xC$R q
*/ WGC'k
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public class CountControl{ S-Z s
private static long lastExecuteTime=0;//上次更新时间 K}KgCJ3
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ^1}Y=!&
/** Creates a new instance of CountThread */ *z3wm-z1&
public CountControl() {} 4Yx\U
public synchronized void executeUpdate(){ i0jR~vF
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Connection conn=null; $%GW~|S\C
PreparedStatement ps=null; G&DL)ePu]m
try{ naaww
conn = DBUtils.getConnection(); Fx]}<IudA^
conn.setAutoCommit(false); 7%7 \2!0J}
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 9FKowF_8
for(int i=0;i<CountCache.list.size();i++){ PKK18E}{%^
CountBean cb=(CountBean)CountCache.list.getFirst(); jn:9Cr,o;g
CountCache.list.removeFirst(); qiyX{J7Z
ps.setInt(1, cb.getCountId()); J|gRG0O9Ya
ps.executeUpdate();⑴ }$wWX}@
//ps.addBatch();⑵ >P_/a,O8
} [m+):q^
//int [] counts = ps.executeBatch();⑶ $TK<~3`
conn.commit(); ? 3'O
}catch(Exception e){ ?E2$
e.printStackTrace(); F?jFFwim
} finally{ h+"UK=
try{ c&]nAn(
if(ps!=null) { &}."sGK
ps.clearParameters(); EZw<)Q
ps.close(); [(d))(M$|
ps=null; !J/fJW>m6
} i^I
U)\
}catch(SQLException e){} fEgwQ-]
DBUtils.closeConnection(conn); c:OFBVZ
} 4],*y`& g
} 6 $*\%
public long getLast(){ =VFPZ
return lastExecuteTime; O&vE 5%x
} gd=gc<z YP
public void run(){ '^#=,+ A
long now = System.currentTimeMillis(); V!XT=Ou?6
if ((now - lastExecuteTime) > executeSep) { fa:V8xa
//System.out.print("lastExecuteTime:"+lastExecuteTime); ji] H|
//System.out.print(" now:"+now+"\n"); 8
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); :Y\!~J3W
lastExecuteTime=now; J =j6rD
executeUpdate(); L^b /+R#
} 6!Z>^'6
else{ KN\*|)
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); #J_+
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} L2$`S'U W
} %7vjYvo>
} Jp#Onl+d6
//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 J6s@}@R1
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类写好了,下面是在JSP中如下调用。 wx]r{
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<% -,Y[`(q
CountBean cb=new CountBean(); f?P>P23
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \]7i-[
CountCache.add(cb); ;+6TZqklQ
out.print(CountCache.list.size()+"<br>"); KbicP<
CountControl c=new CountControl(); ,%!E-gr
c.run(); L';b908r2
out.print(CountCache.list.size()+"<br>"); {<J(*K*\Jo
%>