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: NkGtZ.!pk
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CountBean.java *!`&+w
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/* v.:Q& ]
* CountData.java `/R. 5;$|
* z$m(@Q
* Created on 2007年1月1日, 下午4:44 w0$+v/
* zpf<!x^
* To change this template, choose Tools | Options and locate the template under Wy6a4oY
* the Source Creation and Management node. Right-click the template and choose 4`oKvL9
* Open. You can then make changes to the template in the Source Editor. gk8v{'0Er
*/ 7vPGb:y
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package com.tot.count; #Cs/.(<
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/** 7],y(:[=v
* P;gd!Yl<-
* @author {*hGe_^
*/ pQ7elv]
public class CountBean { _hJ+8B^`
private String countType; OC,yL Q
int countId; 94
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/** Creates a new instance of CountData */ e"sv_$*
public CountBean() {} 6A>bm{`c:
public void setCountType(String countTypes){ vOKNBR2
this.countType=countTypes; uInI{>
} (?,jnnub
public void setCountId(int countIds){ PK&&Vu2M
this.countId=countIds; UjJ&P)
} p_n$}z
public String getCountType(){ L)7{_s
return countType; ~qL/P 5*+
} ~n0Exw(
public int getCountId(){ C{l-l`:
return countId; Kt]vTn7!9
} Z{#3-O<a+n
} [\Aws^fD_
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CountCache.java CUC]-]8
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/* jc>B^mqx
* CountCache.java Jk|DWZ
* o(v7&m;
* Created on 2007年1月1日, 下午5:01 d,meKQn
* :D2GLq *\
* To change this template, choose Tools | Options and locate the template under !]mo.zDSW5
* the Source Creation and Management node. Right-click the template and choose Q9p2.!/C1
* Open. You can then make changes to the template in the Source Editor. <]oPr1
*/ 4V]xVma
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package com.tot.count; <H<Aba9\
import java.util.*; WyQ8}]1b
/** *j1Skd.#At
* !](Mt?e
* @author {~g7&+9x*
*/ J-
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public class CountCache { 2.{<C.BK{
public static LinkedList list=new LinkedList(); l)DcwkIG
/** Creates a new instance of CountCache */ hlc g[Qdo*
public CountCache() {} %Y|AXxR
public static void add(CountBean cb){ ~% ]V,-4
if(cb!=null){ BjjuZN&
list.add(cb); SZ4@GK
} ,@N.v?p>
} MD4mh2
} ]5ibg"{S
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CountControl.java hD,^mru
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/* 9/&1lFKJ
* CountThread.java RJT55Rv{
* xTcY&
* Created on 2007年1月1日, 下午4:57
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* 4 #lLC-k
* To change this template, choose Tools | Options and locate the template under y^{4}^u-^
* the Source Creation and Management node. Right-click the template and choose \j
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* Open. You can then make changes to the template in the Source Editor. Fghan.F
*/ EjEXev<]
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package com.tot.count; |VM=:}s&
import tot.db.DBUtils; `q\v~FT
import java.sql.*; lY[1P|]
/** j6 _w2
* ]8cD, NS
* @author F?y
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*/ rX`fjS*C
public class CountControl{ ZiH4s|
private static long lastExecuteTime=0;//上次更新时间 F*:H&,
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 DAMw(
/** Creates a new instance of CountThread */ hSh^A5
/
public CountControl() {} `I|Y7GoUO
public synchronized void executeUpdate(){ cIuCuh0I`
Connection conn=null; pFo,@M
PreparedStatement ps=null; dftX$TS
try{ `\BBdQ#bH
conn = DBUtils.getConnection(); 6p,}?6^
conn.setAutoCommit(false); Fk`6
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); :}v:=c k
for(int i=0;i<CountCache.list.size();i++){ 3`"k1W
CountBean cb=(CountBean)CountCache.list.getFirst(); ,zBc-Cm
CountCache.list.removeFirst(); `E>o:tff
ps.setInt(1, cb.getCountId()); 9<Th: t|w
ps.executeUpdate();⑴ Y$3liDeL=
//ps.addBatch();⑵ " M&zW&
} {N-*eV9#
//int [] counts = ps.executeBatch();⑶ :3}K$
conn.commit(); R*vfp?x
}catch(Exception e){ >4T7DMy
e.printStackTrace(); MF::At[4
} finally{ k@9q5lu;T
try{ xtXK3[s
if(ps!=null) { t{ridA}
ps.clearParameters(); D6FG$SV
ps.close(); kN vNV(4
ps=null; v[m1R'
} ljh,%#95=
}catch(SQLException e){} ?3iN)*Ut
DBUtils.closeConnection(conn); (L<G=XC
} mx^rw*'JGC
} F@X8a/;F-
public long getLast(){ YE@!`!`d:
return lastExecuteTime; %U97{y
} Fi+,omB&
public void run(){ E{}eYU
long now = System.currentTimeMillis(); gLg\W3TOi
if ((now - lastExecuteTime) > executeSep) { d[ce3':z
//System.out.print("lastExecuteTime:"+lastExecuteTime); >P ygUY
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//System.out.print(" now:"+now+"\n"); UWBR5
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ). HnK
lastExecuteTime=now; a'\fS7aE0l
executeUpdate(); "&kXAwe
} t\<*Q3rl-
else{ o6:p2W
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); `+WQ^dP@
} 'KNUPi|
} ?vP}#N!=d
} !=+hU/e
//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 YW-Ge
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类写好了,下面是在JSP中如下调用。 ,<CzS,(
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<% *>Zq79TG
CountBean cb=new CountBean(); XZPq4(,9}
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); (K>4^E8
CountCache.add(cb); d!q)FRzi
out.print(CountCache.list.size()+"<br>"); wQ9fPOm
CountControl c=new CountControl(); mY]R~:
c.run(); 9t0NO-a
out.print(CountCache.list.size()+"<br>"); n11eJEtm
%>