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: x@KZ]
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CountBean.java r]Lc9dL
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/* SF*n1V3hx
* CountData.java 3W_PE+:Kr
* 2RM+W2!!
* Created on 2007年1月1日, 下午4:44 _iV]_\0W2
* n$n7-7
* To change this template, choose Tools | Options and locate the template under Y>+y(ck
* the Source Creation and Management node. Right-click the template and choose x[3A+
* Open. You can then make changes to the template in the Source Editor. U#&7p)4(
*/ cV{o?3<:B
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package com.tot.count; oXXC@[??}N
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/** pmWr]G3,*
* Av' GB
* @author /X'(3'a
*/ G 2!xPHz
public class CountBean { fw6UhG
private String countType; ^=
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int countId; ]X Z-o>+,
/** Creates a new instance of CountData */ `;l .MZL!
public CountBean() {} .iX# A<E}
public void setCountType(String countTypes){ ?>"Yr,b?
this.countType=countTypes; #~O b)q|
} f"1>bW>R+
public void setCountId(int countIds){ *3/T;x.
this.countId=countIds; ]n."<qxeT
} )Gw~XtB2
public String getCountType(){ mtz#}qD66
return countType; $-}e; V Zb
} *^%Q0mU[
public int getCountId(){ \;u@ "
return countId; qt%D'
} v[e:qi&fG
} )B,|@ynu
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CountCache.java 91>fqe
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/* o]:3H8
* CountCache.java o6
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* Jc&y9]
* Created on 2007年1月1日, 下午5:01 B/~%h |
* xj5;: g#!
* To change this template, choose Tools | Options and locate the template under YW u cvw&
* the Source Creation and Management node. Right-click the template and choose ABE@n%|`
* Open. You can then make changes to the template in the Source Editor. :G\<y
*/ I$N8tn+E
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package com.tot.count; <Rh6r}f
import java.util.*; |sRipWh
/** Mi'8
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* m<FOu<y
* @author 8#!i[UFdj
*/ 5%sE]Y#
public class CountCache { xk&Jl#v
public static LinkedList list=new LinkedList(); {:@tQdM:i8
/** Creates a new instance of CountCache */ B#/Q'V
public CountCache() {} ;4N;D
public static void add(CountBean cb){ ;q N+^;,2
if(cb!=null){ *HEuorl
list.add(cb); M@0;B30L
} )jrV#/m9
} 2{|h8oz
} L_=3<nE
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CountControl.java 0d8%T<=J
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/* \+aC"#+0
* CountThread.java 5onm]V]
* V3 ~~
* Created on 2007年1月1日, 下午4:57 P ;IrBq6|o
* ]?*I9
* To change this template, choose Tools | Options and locate the template under B,,D7cQC
* the Source Creation and Management node. Right-click the template and choose qOIW(D
* Open. You can then make changes to the template in the Source Editor. P#=`2a#G
*/ 8 r_>t2$
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package com.tot.count; "*G.EiLq
import tot.db.DBUtils; -D6exTxh"
import java.sql.*; vWGwVH/K
/** 4:g R r
* }.s~T#v
* @author M|:UwqV>
*/ gz3pX#S
public class CountControl{ {nLjY|*
private static long lastExecuteTime=0;//上次更新时间 x?&$ ci
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ,}K<*t[I
/** Creates a new instance of CountThread */ [jmd
public CountControl() {} bw\@W{a%q
public synchronized void executeUpdate(){ O)vp~@|
Connection conn=null; OpHsob~
PreparedStatement ps=null; C*P7-oE2rh
try{ 'C"9QfK
conn = DBUtils.getConnection(); /Q~i~B 2j-
conn.setAutoCommit(false); 0jEL<TgC
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); @')[FEdW
for(int i=0;i<CountCache.list.size();i++){ M![J2=
CountBean cb=(CountBean)CountCache.list.getFirst(); fkac_X$7
CountCache.list.removeFirst(); YpqrZWvh
ps.setInt(1, cb.getCountId()); i>(e}<i
ps.executeUpdate();⑴ wiiCd
//ps.addBatch();⑵ ti#7(^j
} -\C!I
//int [] counts = ps.executeBatch();⑶ i-6Z"b{
conn.commit(); 2k=#om19
}catch(Exception e){ Qjb:WC7he
e.printStackTrace(); <i,U )Tt^C
} finally{ )==Jfn y
try{ #'y#"cmQ.
if(ps!=null) { [UH||qW
ps.clearParameters(); NX}<*b/
ps.close(); wp&=$Aa)'
ps=null; 9g<7i
} =zz~kon9
}catch(SQLException e){} AB4(+S*LA
DBUtils.closeConnection(conn); :8OZ#D_Hl
} D|{jR~J)xK
} HPZ}*m'
public long getLast(){ J@u;H$@/y
return lastExecuteTime; %\:[ o
} V;v8=1t!
public void run(){ R~PA1wDZ
long now = System.currentTimeMillis(); #)nSr
if ((now - lastExecuteTime) > executeSep) { aeD ;5VV
//System.out.print("lastExecuteTime:"+lastExecuteTime); s=;uc]9g
//System.out.print(" now:"+now+"\n"); u?}(P_9
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); b}"N`,0dO
lastExecuteTime=now; ynQ: >tw
executeUpdate(); P09;ng67
} Hg=";,J
else{ ZusEfh?
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); lz?$f4TzA
} \RG8{G,
} bJX)$G
} N(Tz%o4
//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 @"^0%/2-
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类写好了,下面是在JSP中如下调用。 tIuCct-
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<% W>j !Q^?
CountBean cb=new CountBean(); M
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); c_4[e5z
CountCache.add(cb); ^y<<>Y'I
out.print(CountCache.list.size()+"<br>"); xjKR R?
CountControl c=new CountControl(); !]=d-RGNe
c.run(); sG92XJ
out.print(CountCache.list.size()+"<br>"); 6;ixa
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