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: k=p[Mlic/
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CountBean.java CO,{/
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/* vqoK9
* CountData.java 8ZjRMr}
* `{IL.9M!f
* Created on 2007年1月1日, 下午4:44 ' qT\I8%
* 9zx9t
* To change this template, choose Tools | Options and locate the template under p74Nd4U$s
* the Source Creation and Management node. Right-click the template and choose |#xBC+
* Open. You can then make changes to the template in the Source Editor. 3H>\hZ
*/ P%R9\iajH
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package com.tot.count;
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/** l LBzY`j
* G|t0no\f
* @author !"hzGgOOX
*/ vq3:N'
public class CountBean { 5L7nEia'
private String countType; 5K&A2zC|
int countId; T~XKV`LQ
/** Creates a new instance of CountData */ 3)e{{]6
public CountBean() {} kQ2WdpZ/
public void setCountType(String countTypes){ <dXeP/1w`
this.countType=countTypes; I+3=|Vef
} fX\y/C
public void setCountId(int countIds){ qv:DpK
this.countId=countIds; o7PS1qcya<
} j}J=ZLr/V"
public String getCountType(){ _ q>|pt.W
return countType; ,j(E>g3
} ]w4?OK(j
public int getCountId(){ >s.y1Vg~C
return countId; ESFJN}Q%0.
} v/v PU
} .Tw:Y,G
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CountCache.java Ut/%+r"s
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/* b8%TwYp
* CountCache.java {od@Sl
* QWt3KW8)
* Created on 2007年1月1日, 下午5:01 Azr|cKu]
* d}|z+D
* To change this template, choose Tools | Options and locate the template under T>hm\ !
* the Source Creation and Management node. Right-click the template and choose XW2ZQMos1
* Open. You can then make changes to the template in the Source Editor. Bk5 ELf8pL
*/ W|sU[dxZ
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package com.tot.count; qq?o^_^4
import java.util.*; aN,?a@B
/** ^e$!19g
* Gv#bd05X
* @author =C|^C3HK
*/ $n47DW&
public class CountCache { Z?&ZgaSz
public static LinkedList list=new LinkedList(); /m^G 99N
/** Creates a new instance of CountCache */ HvZSkq^
public CountCache() {} |-cXb.M[
public static void add(CountBean cb){ Z@*!0~NH=4
if(cb!=null){ *<"{(sAvk
list.add(cb); *p\fb7Pu_3
} D=.Ob<m`Z
} kf |J
} ;v.J
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CountControl.java #3RElI
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/* COBjJ3
* CountThread.java /3sX>Rj
* \;Q!}_ K
* Created on 2007年1月1日, 下午4:57 6rCUq
* )
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* To change this template, choose Tools | Options and locate the template under 6iHY{WcDj
* the Source Creation and Management node. Right-click the template and choose -Oz! GX
* Open. You can then make changes to the template in the Source Editor. >'WTVj `
*/ {utnbtmu
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package com.tot.count; _[l&{,
import tot.db.DBUtils; Z>X]'q03
import java.sql.*; ]F;1 l3I-
/** \F+".X#jh
* }5$le]
* @author nKEw$~F
*/ 4v{Ye,2
public class CountControl{ k;SKQN
private static long lastExecuteTime=0;//上次更新时间 Dk2Zl
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 XgeUS;qtta
/** Creates a new instance of CountThread */ 7xWJw
public CountControl() {} `fG<iBD
public synchronized void executeUpdate(){ :2wT)w z
Connection conn=null; *1:kIi7_
PreparedStatement ps=null; 7;r3Bxa
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try{ 8$IUit h
conn = DBUtils.getConnection(); Y~#F\v
conn.setAutoCommit(false); ;'[?H0Jw'
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); z 9WeOs
for(int i=0;i<CountCache.list.size();i++){ c]$$ap
CountBean cb=(CountBean)CountCache.list.getFirst(); J{XRltI+
CountCache.list.removeFirst(); I1K %n'D
ps.setInt(1, cb.getCountId()); ^R(=4%8%"
ps.executeUpdate();⑴ $?[pcgv
//ps.addBatch();⑵ )U]q{0`
} :DuEv:;v
//int [] counts = ps.executeBatch();⑶ 6O0aGJ,H
conn.commit(); $j@P8<M7
}catch(Exception e){ uI9+@oV
e.printStackTrace(); hew"p( `
} finally{ adgd7JjI*
try{ s%5XBI
if(ps!=null) { ,u-9e4
ps.clearParameters(); ]'hel#L;l
ps.close(); mGmZ}H'{
ps=null; -?IF'5z
} 2$o\`^dy
}catch(SQLException e){} #P!M"_z
DBUtils.closeConnection(conn); xsS;<uCD
} Of9 gS-m
} K05T`+N,
public long getLast(){ q$ j
return lastExecuteTime; A\E ))b9+
} #~w~k+E4
public void run(){ g~9b_PY9
long now = System.currentTimeMillis(); $d.Dk4.ed
if ((now - lastExecuteTime) > executeSep) { >-w#&T &K
//System.out.print("lastExecuteTime:"+lastExecuteTime); B=}QgXg
//System.out.print(" now:"+now+"\n"); KO"+"1 .
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); !i@A}$y
lastExecuteTime=now; WK#%G
executeUpdate(); 9gIim
} /{I-gjovy
else{ + kF%>F]
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); XV)ctF4
} DC_k0VBn
} 45jImCm
} :n%&
//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 $_\x}`c~.
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类写好了,下面是在JSP中如下调用。 ]<Q&
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<% M}=>~TA@
CountBean cb=new CountBean(); A.$P1zwC
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Cj YI *
CountCache.add(cb); 2)QZYgfh
out.print(CountCache.list.size()+"<br>"); 5rQu^6&
CountControl c=new CountControl(); KAu>U3\/
c.run(); #hXvGon$?
out.print(CountCache.list.size()+"<br>"); +u&3pK>f
%>