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: =1O?jrl~q
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CountBean.java xOhRTxic
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/* %@>YNPD`E
* CountData.java sb'lZFSP~s
* Tu==49
* Created on 2007年1月1日, 下午4:44 .a {QA
* bH_I7G&m
* To change this template, choose Tools | Options and locate the template under g/x_m.
* the Source Creation and Management node. Right-click the template and choose *JwFD^<j
* Open. You can then make changes to the template in the Source Editor. AYt*'Zeg!s
*/ wtq,`'B
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package com.tot.count; {JTmP `&l
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/** _'&k#Q
* ej<`CQ
* @author @#A!w;bz
*/ TWtC-wI;
public class CountBean { D_Guc8*
private String countType; j+nv=p
int countId; f:S}h-AL&
/** Creates a new instance of CountData */ ekrBNDs9
public CountBean() {} !W(`<d]68:
public void setCountType(String countTypes){ KLW&bJ$|j
this.countType=countTypes; Jlz9E|*qV
} rJX\6{V!_
public void setCountId(int countIds){ uO"y`$C$_
this.countId=countIds; 2av*o~|J*:
} \PzN XQ$
public String getCountType(){ ,^HS`!s[ E
return countType;
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} SijS5irfk
public int getCountId(){ % oR>Uo
return countId; } +1'{B"I
} Xty#vI
} `wf|u M
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CountCache.java QsM*wT&aa
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/* *l:&f_ngV
* CountCache.java ?@>;/@
* bK?MT]%}r
* Created on 2007年1月1日, 下午5:01 2p+C%"n>
* zs0hXxTY:
* To change this template, choose Tools | Options and locate the template under 1!d)PK>1$
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. w1cw1xX*
*/ M.S
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package com.tot.count; k},> ^qE
import java.util.*; .x>HA^4
/** !:d L~n
* Ajg\aof0{
* @author #%4=)M>^
*/ qv$!\ T
public class CountCache { _=?2 3
public static LinkedList list=new LinkedList(); r,Ds[s)B
/** Creates a new instance of CountCache */ lJUy;yp_+
public CountCache() {} bb}?h]a
public static void add(CountBean cb){ BW>5?0E[4(
if(cb!=null){ l^
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list.add(cb); b9DR%hO:
} qfa}3k8et
} i+1Qf
} E0<)oQ0Xa>
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CountControl.java aLYLd/ KV
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/* bQ"N
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* CountThread.java cLAesj
* /LF3O~Go
* Created on 2007年1月1日, 下午4:57 05"qi6tncz
* %<AS?Ry
* To change this template, choose Tools | Options and locate the template under yjFe'
* the Source Creation and Management node. Right-click the template and choose e"~)Utk
* Open. You can then make changes to the template in the Source Editor. >T QZk4$
*/ <ZVZ$ZW~D
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package com.tot.count; i5VG2S
import tot.db.DBUtils; M%|f+u &
import java.sql.*; 4\HsU9x
/** =U
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* rH.gF43O:
* @author n]v7V&mj\
*/ {-h, ZdH^
public class CountControl{ JjQVzkE
private static long lastExecuteTime=0;//上次更新时间 ;y OD
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 AEqq1A
/** Creates a new instance of CountThread */ `s%QeAde
public CountControl() {} vd(dNu&,<
public synchronized void executeUpdate(){ Z%e|*GS{
Connection conn=null; t!0dJud
PreparedStatement ps=null; cQn)^jx=
try{ Ka.Nr@Rq*~
conn = DBUtils.getConnection(); Ye@t_,)x
conn.setAutoCommit(false); sUbFRq
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); N+J>7_k
for(int i=0;i<CountCache.list.size();i++){ Um\0i;7 ~4
CountBean cb=(CountBean)CountCache.list.getFirst(); (6clq:c7j
CountCache.list.removeFirst(); 6__K#r
ps.setInt(1, cb.getCountId()); r0{]5JZt/
ps.executeUpdate();⑴ akCIa'>t
//ps.addBatch();⑵ |xeE3,8
} JGgxAd{L
//int [] counts = ps.executeBatch();⑶ GS4_jvD-
conn.commit(); n_9x"m$
}catch(Exception e){ !F$R+A+L
e.printStackTrace(); (bvoF5%
} finally{ ESv:1o`?n
try{ > 0T
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if(ps!=null) { Q;wB{vr$
ps.clearParameters(); t!t=|JNf{
ps.close(); [q3+$W \r
ps=null; oCuV9dA.
} M _ (2sq
}catch(SQLException e){} Up|f=@=
DBUtils.closeConnection(conn); c{4R*|^
} N,|r1u 9X#
} Ag6uR(uI
public long getLast(){ qd8pF!u|#
return lastExecuteTime; agT7=hX].
} {i;6vRr
public void run(){ 8[R1A
long now = System.currentTimeMillis(); IN_gF_@%
if ((now - lastExecuteTime) > executeSep) { 3I*uV!notJ
//System.out.print("lastExecuteTime:"+lastExecuteTime); Ue! Q. "
//System.out.print(" now:"+now+"\n"); KTv4< c]
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); $
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lastExecuteTime=now; U|?,N0%Z1
executeUpdate(); %w:'!X><
} Z
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else{ _lT0Hu
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); On%,l
} lD3)TAW@o
} ANb"oX c
} u>o<tw%Y
//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 G=cNzr9
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类写好了,下面是在JSP中如下调用。 o(Kcs-W2
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CountBean cb=new CountBean(); >BJ}U_ck
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); tW(+xu36
CountCache.add(cb); 4E'|.tt(
out.print(CountCache.list.size()+"<br>"); 85hQk+Bu4
CountControl c=new CountControl(); U`1l8'W}:#
c.run(); 0'@u!m?
out.print(CountCache.list.size()+"<br>"); BKZ v9
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