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:
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CountBean.java Mb\[` 4z
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/* BDc "0XH
* CountData.java c
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* kOLS<>.
* Created on 2007年1月1日, 下午4:44 qp`G5bw
* 9
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* To change this template, choose Tools | Options and locate the template under Sp~gY]:
* the Source Creation and Management node. Right-click the template and choose 2\L}Ka|v
* Open. You can then make changes to the template in the Source Editor. fS- 31<?
*/ h@D</2>
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package com.tot.count; xyaU!E*
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/** Z<~^(W7h
* Nbm=;FHB`
* @author ]qNPOnlp
*/ F<^93a9
public class CountBean { 90]{4 ]y;
private String countType; Nk/Ms:57y
int countId; c69M
/** Creates a new instance of CountData */ Jm{~H%
public CountBean() {} R:FyCT_,
public void setCountType(String countTypes){ hP]zC1s
this.countType=countTypes; %{K6
} u9^R
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public void setCountId(int countIds){ sAKQ.8$h*
this.countId=countIds; }hX"A!0
} t.tdY
public String getCountType(){ hXM2B2[
return countType; MESPfS+
} A}Gj;vaw
public int getCountId(){ Co^a$K
return countId; D[iIj_CKQ
} Ea2&7
} dL!K''24{
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CountCache.java n\D3EP<s
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/* l5d>
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* CountCache.java ,wlSNb@'
* TAn.5
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* Created on 2007年1月1日, 下午5:01 w=H4#a?fc
* SsF
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* To change this template, choose Tools | Options and locate the template under M[ZuXH}
* the Source Creation and Management node. Right-click the template and choose mca9 +v
* Open. You can then make changes to the template in the Source Editor. jw!QjVuRN%
*/ @5-+>\Hd^t
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package com.tot.count; vaEAjg*To<
import java.util.*; .+cYzS]!
/** sw@*N
* \ml6B6
* @author )iG+pP@.@
*/ ^. i;,
public class CountCache { MB,P#7|
public static LinkedList list=new LinkedList(); f3]u-e'b
/** Creates a new instance of CountCache */ TAu*lL(F
public CountCache() {} vDAv/l9
public static void add(CountBean cb){ K-}'Fiq
if(cb!=null){ tFd^5A*
list.add(cb); _\Cd.
} ]m(5>h#
} T\h_8
} fKY1=3
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CountControl.java <#9zc'ED:
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/* ~Zd n#z\
* CountThread.java |V|)cPQ
* 8c'0"G@S
* Created on 2007年1月1日, 下午4:57 %KmB>9
* _(\\>'1q!
* To change this template, choose Tools | Options and locate the template under |KFWW
* the Source Creation and Management node. Right-click the template and choose \'L6m1UZ%
* Open. You can then make changes to the template in the Source Editor. D{,B[5
*/ +C)auzY7N
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package com.tot.count; 3&@MZF&
import tot.db.DBUtils; AOaf ,ZF
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import java.sql.*; OQA3 ~\Vu
/** 6]}Xi:I
* m~Dq0 T
* @author =;3|?J0=
*/ oLn| UWe_
public class CountControl{ Te#wU e-|
private static long lastExecuteTime=0;//上次更新时间 V6d*O`
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 IfZaK([
/** Creates a new instance of CountThread */ GZc%*
public CountControl() {} `Vwj|[0k
public synchronized void executeUpdate(){ @$79$:q N
Connection conn=null; j1>77C3
PreparedStatement ps=null; Tj{!Fx^H
try{ 8[FC
conn = DBUtils.getConnection(); [<sBnHbvQ.
conn.setAutoCommit(false); ++13m*fA
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); #U&G$E`7
for(int i=0;i<CountCache.list.size();i++){ t@/r1u|iq
CountBean cb=(CountBean)CountCache.list.getFirst(); 'eo2a&S2D
CountCache.list.removeFirst(); QLH
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ps.setInt(1, cb.getCountId()); ii*Ty!Sa
ps.executeUpdate();⑴ <!zItFMD[m
//ps.addBatch();⑵ 5hp b=2
} j>s%q.
//int [] counts = ps.executeBatch();⑶ DrltxI)
conn.commit(); C_#0Y_O
}catch(Exception e){ _TB\@)\
e.printStackTrace(); m`9)DsR
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} finally{ =I/J !}.
try{ ZF;S}1
if(ps!=null) { 5Tpn`2F
ps.clearParameters(); |U^
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ps.close(); 0{PK]qp7
ps=null; d<6L&8)<
} h3p 3~xq
}catch(SQLException e){} "eQ9 6^'J
DBUtils.closeConnection(conn); !*|CIxk(
} y::;e#.
} ORx,n7-
public long getLast(){ D2!ww{t
return lastExecuteTime; oqDW}>.
} %e%nsj6
public void run(){ JZL!(>tI
long now = System.currentTimeMillis(); @;<w"j`r
if ((now - lastExecuteTime) > executeSep) { ]jHB'Y
//System.out.print("lastExecuteTime:"+lastExecuteTime); 317Buk
//System.out.print(" now:"+now+"\n"); _ksp;kH?)
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); v!F(DP.)Z
lastExecuteTime=now; Ir\3c9
executeUpdate(); ^s5.jlZr@
} z7P PwTBa
else{ <tF]>(|M
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); T"d]QYJS
} \\)-[4uC
} /2HwK/RZ
} S|]~,l2]}
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 ,(`@ZFp$
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类写好了,下面是在JSP中如下调用。 I;-{#OE,
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<% cR5<.$aY
CountBean cb=new CountBean(); KH
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); &`TX4b^/!
CountCache.add(cb); =_yOX=g|
out.print(CountCache.list.size()+"<br>"); N%B#f\N
CountControl c=new CountControl(); 8:&@MZQ&!
c.run(); TVFGonVY
out.print(CountCache.list.size()+"<br>"); %okEN!=
%>