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: xz,o Mlw
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CountBean.java mT #A?C2
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/* L6#4A3yh
* CountData.java =k>fW7e
* [jksOC)@4
* Created on 2007年1月1日, 下午4:44 |QD#Dx1_
* 3 NFo=Z8
* To change this template, choose Tools | Options and locate the template under x6^Y&,y9kU
* the Source Creation and Management node. Right-click the template and choose ]s!id[j
* Open. You can then make changes to the template in the Source Editor. 0X4)=sJP
*/ -2(?O`tZ
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package com.tot.count; 9aNOfs8(
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/** "vg.{
* Nukyvse
* @author KMK8jJ
*/ 5S,Kq35$(
public class CountBean { 8&nb@l
private String countType; I9Uj3cL\
int countId; (z8;J>7
/** Creates a new instance of CountData */ B"zB=Aw
public CountBean() {} b(CO7/e>
public void setCountType(String countTypes){ [$pb
this.countType=countTypes; pwk Te
} cGR) $:
public void setCountId(int countIds){ 'MBXk2?b
this.countId=countIds; KVh#"]<WV
} 1)jeawVmj
public String getCountType(){ u!&T}i:
return countType; ~Uey'Xz
} =@S
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public int getCountId(){ seRf q&
return countId; !tcz_%
} ,RM8D)m\
} S;jD@j\t&
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CountCache.java r
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/* sp
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* CountCache.java 9D Nd} rXO
* Dy>6L79G
* Created on 2007年1月1日, 下午5:01 ;obOr~Jx'5
* -FI)o`AE
* To change this template, choose Tools | Options and locate the template under @}:E{J#g
* the Source Creation and Management node. Right-click the template and choose xm1'
* Open. You can then make changes to the template in the Source Editor. j"hEs(t
*/ U\B9Ab
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package com.tot.count; HA,8O[jon
import java.util.*; ]jC{o,?s
/** }(
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* HfgTc
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* @author Yj*T'<e
*/ ~CbiKez
public class CountCache { [Eccj`\e g
public static LinkedList list=new LinkedList(); :Yn.Wv-
/** Creates a new instance of CountCache */ 6i~|<vcSP
public CountCache() {} (,jsZ!sl
public static void add(CountBean cb){ n6.Z{Q'b
if(cb!=null){ `2LmLFkb
list.add(cb); @TD=or .&
} dKCl#~LAI'
} y<w_>O
} uR{)%udu
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CountControl.java RXg\A!5GV
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/* 9#:fQ!3`
* CountThread.java xw_klHL-o
* pe0ax-Zv
* Created on 2007年1月1日, 下午4:57 2T)k-3
* C?>d$G8
* To change this template, choose Tools | Options and locate the template under o$l8"Uv
* the Source Creation and Management node. Right-click the template and choose T#i;=NP"
* Open. You can then make changes to the template in the Source Editor. x {Utf$|
*/ R!QR@*N
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package com.tot.count; =}Zl
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import tot.db.DBUtils; sR>>l3H
import java.sql.*; /<n7iIK)
/**
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* |h6!b t!=
* @author vA!IcDP"
*/ hnB`+!
public class CountControl{ xvl{o
private static long lastExecuteTime=0;//上次更新时间 >6jal?4u-
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 V^R,j1*
/** Creates a new instance of CountThread */ q[W6I9
public CountControl() {} pZopdEFDK|
public synchronized void executeUpdate(){
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Connection conn=null; 8 yi#] 5`Q
PreparedStatement ps=null; dm[cl~[
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try{ b@8z+,_
conn = DBUtils.getConnection(); iKV|~7nwO
conn.setAutoCommit(false); YVa,?&i=N
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); XPqGv=CN
for(int i=0;i<CountCache.list.size();i++){ f_n
CountBean cb=(CountBean)CountCache.list.getFirst(); FXDB> }8
CountCache.list.removeFirst(); aVK,(j9u
ps.setInt(1, cb.getCountId()); ?!U.o1
ps.executeUpdate();⑴ C]8w[)d[`;
//ps.addBatch();⑵ iY$iL<
} Pg:xC9w4
//int [] counts = ps.executeBatch();⑶ J^yqu{
conn.commit(); X,aRL6>r
}catch(Exception e){ _q#pEv
e.printStackTrace(); EjFpQ|-L|
} finally{ L~{(9J'(
try{ MXfyj5K
if(ps!=null) { :%J;[bS+
ps.clearParameters(); \By_mw
ps.close(); iTq&h=(n
ps=null; YcX"Z~O6j=
} au+Jz_$)
}catch(SQLException e){} ,'HjL:r
DBUtils.closeConnection(conn); RHn3\N
} \P+^BG!
} ]
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public long getLast(){ ,(Zxd4?y
return lastExecuteTime; ; 8DtnnE
} 7r'_p$
public void run(){ Ul/m]b6-
long now = System.currentTimeMillis(); ,M?8s2?
if ((now - lastExecuteTime) > executeSep) { u8KQV7E
//System.out.print("lastExecuteTime:"+lastExecuteTime); n0co*
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//System.out.print(" now:"+now+"\n"); ]58~b%s
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Cy uRj[;B
lastExecuteTime=now; mOh?cjOi
executeUpdate(); )uOtQ0
} I50LysM
else{ ~Yg)8
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); +@!\3a4!
} 5PZ7-WJ/
} K/Yeh<_&
} ![ce }
//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 9q$^x/z!
~K #92
类写好了,下面是在JSP中如下调用。 R,78}7B
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<% 3e^0W_>6
CountBean cb=new CountBean(); K;"oK
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Zl&ED{k<
CountCache.add(cb); 2;"vF9WMm
out.print(CountCache.list.size()+"<br>"); J5Zz*'av'
CountControl c=new CountControl(); B *O/>=_
c.run(); [<U=)!Swg
out.print(CountCache.list.size()+"<br>"); y
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