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: Sn|BlXrey
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CountBean.java 5;YMqUkw
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/* s6@DGSJ
* CountData.java ATK_DEAu
* 6}FP
* Created on 2007年1月1日, 下午4:44 Jt}Bpg!J
* 32`{7a3!=
* To change this template, choose Tools | Options and locate the template under V)[@98T_4?
* the Source Creation and Management node. Right-click the template and choose 6|PrX
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* Open. You can then make changes to the template in the Source Editor. eLfk\kk]Pc
*/ ?k(7 LX0j
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package com.tot.count; :qd`zG3
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/** ~=uWD&5B4
* ,Vt/(x-
* @author K/|Z$4S
*/ x$6^R q>2
public class CountBean { vzim<;i
private String countType; Gz,i~XX
int countId; !1$])VQWI
/** Creates a new instance of CountData */ 4b98KsYg
public CountBean() {} hHV";bk
public void setCountType(String countTypes){ xLK<W"%0
this.countType=countTypes; V3^&oe%
} ,F,X
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public void setCountId(int countIds){ m}7iTDJR9
this.countId=countIds; hhCrUn"
}
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public String getCountType(){ Bu#VMkchJ
return countType; wAf\|{Vn
} qVH1}9_
public int getCountId(){ .\)U@L~
return countId; &m-PC(W+
} E87Ww,z8
} E2R&[Q"%
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CountCache.java LG9+y
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/* {>hC~L?6
* CountCache.java W3MJr&p
* xMTKf+7
* Created on 2007年1月1日, 下午5:01 >7jbgHB
* `p2+&&]S
* To change this template, choose Tools | Options and locate the template under \hDlTp}
* the Source Creation and Management node. Right-click the template and choose L ~lxXTG\
* Open. You can then make changes to the template in the Source Editor. >\KNM@'KI
*/ u{['<r;I
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package com.tot.count; 9]f!'d!5
import java.util.*; tX_R_]v3
/** a7r%X -
* ;f#v0W`5
* @author PQ5QA61
*/ }dgfqq
public class CountCache { 4T|b
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public static LinkedList list=new LinkedList(); kmP]SO?tx
/** Creates a new instance of CountCache */ >=:&D)m"
public CountCache() {} "s0)rqf<
public static void add(CountBean cb){ VVac:
if(cb!=null){ d3ZdB4L
list.add(cb); v%+:/m1
} Br1&8L-|%
} %5M/s'O?i
} kMi/>gpQ
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CountControl.java +B B@OW
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/* g{OwuAC_
* CountThread.java z> Rsi
* j*so9M6|c
* Created on 2007年1月1日, 下午4:57 HN=V"a
* Dfg2`l
* To change this template, choose Tools | Options and locate the template under X[]m _@ v
* the Source Creation and Management node. Right-click the template and choose 6Ypc`
* Open. You can then make changes to the template in the Source Editor. Ql/cN%^j$
*/ v$7QIl_/7
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package com.tot.count; _aGOb;h
import tot.db.DBUtils; WA)yfo0A
import java.sql.*; l? Udn0F
/** vK|E>nL
* 8@i7pBl@
* @author $WyD^|~SF
*/ Qu?R8+"KS
public class CountControl{ %7zuQ \w
private static long lastExecuteTime=0;//上次更新时间 _}lZ,L(w
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 qE&v ;
/** Creates a new instance of CountThread */ YVQN&|-
public CountControl() {} PRu 6xsyA
public synchronized void executeUpdate(){ .7e2YI,S
Connection conn=null; #hfXZVD
PreparedStatement ps=null; \KMToN&2
try{ "c3Grfoz
conn = DBUtils.getConnection(); be]bZ
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conn.setAutoCommit(false); Tl(^
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); F,W~,y
for(int i=0;i<CountCache.list.size();i++){ "-e
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CountBean cb=(CountBean)CountCache.list.getFirst(); U`R5'Tf;
CountCache.list.removeFirst(); |'P]GK
ps.setInt(1, cb.getCountId()); SQBa;hvgM
ps.executeUpdate();⑴ &]"
//ps.addBatch();⑵ ")O%86_Q:
} [Y|8\Ph`&
//int [] counts = ps.executeBatch();⑶ ~ELNyI11
conn.commit(); =XA;[PVx:#
}catch(Exception e){ UW N*j_9i
e.printStackTrace(); PDJr<E?
} finally{ E7t+E)=8
try{ 7!@-*/|!S9
if(ps!=null) { EYtL_hNp}I
ps.clearParameters(); HG^B#yX
ps.close(); .{ocV#{s
ps=null; jF ^~p9z
} z.7cy@N6
}catch(SQLException e){} f[<m<I
DBUtils.closeConnection(conn); B:5Rr}eY+
} )WRLBFi3
} "'c
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public long getLast(){ X
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return lastExecuteTime; G,?hp>lj
} QQ%D8$k"
public void run(){ ]RPs|R?
long now = System.currentTimeMillis(); 10)jsA
if ((now - lastExecuteTime) > executeSep) { Bp_$.!Qy
//System.out.print("lastExecuteTime:"+lastExecuteTime); tjIl-IQ
//System.out.print(" now:"+now+"\n"); a|%J=k>>
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 9>l*lCA
lastExecuteTime=now; >p)MawT]
executeUpdate(); w`4=_J=GO
} 7E!IF>`
else{ >6NRi /[
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); $G8E 3|k
} S{]x
} SX<` {x&L
} iP
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//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 d74d/l1*{
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类写好了,下面是在JSP中如下调用。 -e_hrCW&9
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<% KC/=TSSXd.
CountBean cb=new CountBean(); _wTOmz%|R
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 5Sm}nH
CountCache.add(cb); a][f
out.print(CountCache.list.size()+"<br>"); G9Y#kBr
CountControl c=new CountControl(); .X@FXx&
c.run(); )Ub_@)X3%l
out.print(CountCache.list.size()+"<br>"); kh
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