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: 4oA9|}<FR
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CountBean.java HA0Rv#p
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/* ,%EGM+
* CountData.java h1jEulcMtq
* Z]x)d|3;
* Created on 2007年1月1日, 下午4:44 +je{%,*
* @]xHt&j
* To change this template, choose Tools | Options and locate the template under drK &
* the Source Creation and Management node. Right-click the template and choose ,R2;oF_
* Open. You can then make changes to the template in the Source Editor. Lc5I?}:;L
*/ [ %:%C]4
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package com.tot.count; \+Pk"M
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/** 68,(+vkB
* gO,2:,
* @author x>m=n_
*/ ?fmW'vs
public class CountBean { L+J)
private String countType; cOo@UU P
int countId; ] R-<v&O
/** Creates a new instance of CountData */ X;%*+xQ^
public CountBean() {} V.^Z)iNf^
public void setCountType(String countTypes){ uPQrDr5
this.countType=countTypes; V/W{d[86G
} ~ w,hJ `
public void setCountId(int countIds){ a0=>@?
this.countId=countIds; [[gfR'79{
} :]+p#l
public String getCountType(){ _ !H8j/b
return countType; M&~cU{9c
} ! j-JMa?
public int getCountId(){ Egr'IbB
return countId; )W.Y{\D0
} 32Jl|@8,g
} S1G3xY$0
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CountCache.java 0V5 {:mzA
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/* ST7Xgma-
* CountCache.java Fb&WwGY,P
* m?_@.O@]
* Created on 2007年1月1日, 下午5:01 A
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* 1G62Qu$O
* To change this template, choose Tools | Options and locate the template under "pW@[2Dkx/
* 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. ; 6*Ag#Z
*/ ^dCSk==
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package com.tot.count; AB")aX2%E
import java.util.*; SlojB ^%
/** V^ 5Z9!
* w;(B4^?
* @author R'1L%srTM+
*/ 5KvqZ1L
public class CountCache { F-I\x
public static LinkedList list=new LinkedList(); pSh$#]mZ`
/** Creates a new instance of CountCache */ ti}G/*4
public CountCache() {} 11jDAA(|
public static void add(CountBean cb){ }&:F,q*
if(cb!=null){ n 9N'}z
list.add(cb); Y:'#jY*V
} ygSvYMC
} h(Ccm44
} v'X=|$75
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CountControl.java Qb~&a1&s#
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/* %eDJ]\*^X
* CountThread.java PP_fTacX
* g"o),$tm
* Created on 2007年1月1日, 下午4:57 95X!{\
*
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* To change this template, choose Tools | Options and locate the template under KuohUH+
* the Source Creation and Management node. Right-click the template and choose .,7ZDO9{
* Open. You can then make changes to the template in the Source Editor. tpP2dg9dF
*/ [V _?`M
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package com.tot.count; kFsq23Ne
import tot.db.DBUtils; U**v'%{s
import java.sql.*; 1?5UVv_F
/** n^7m^1to
* <=7N2t)s4
* @author K`% I!Br
*/ @!zT+W&
public class CountControl{ cAAyyc"yJ
private static long lastExecuteTime=0;//上次更新时间 wc6v:,&
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Pu7cL
/** Creates a new instance of CountThread */ z~+gche>
public CountControl() {} Qpaan
public synchronized void executeUpdate(){ E+|r
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Connection conn=null; ` "JslpN
PreparedStatement ps=null; V-
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try{ KQ\d$fX
conn = DBUtils.getConnection(); TDnbX_xC<
conn.setAutoCommit(false); P 2^((c
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); $bv l.c
for(int i=0;i<CountCache.list.size();i++){ ~PAbtY9}U
CountBean cb=(CountBean)CountCache.list.getFirst(); <{yQNXf[
CountCache.list.removeFirst(); }R]^%q @&
ps.setInt(1, cb.getCountId()); zA?]AL(+YW
ps.executeUpdate();⑴ b/dyH
//ps.addBatch();⑵ Y%iimbBY|
} BpQ/$?5E"
//int [] counts = ps.executeBatch();⑶ #m<<]L(o8W
conn.commit(); (!9ybH;T
}catch(Exception e){ 0;pO QF
e.printStackTrace(); z`Cq,Sz/
} finally{ "-;l{tL
try{ B{+ Ra
if(ps!=null) { 70&]nb6f
ps.clearParameters(); sBfPhBT|
ps.close(); en6oFPG
ps=null; qmJ^@dxs
} /n|`a1!
}catch(SQLException e){} F9&ae*>,
DBUtils.closeConnection(conn); ={a_?l%
} '5n67Hl 1
} (xhwl=MX)
public long getLast(){ :5M7*s)e16
return lastExecuteTime; dfoFs&CSKh
} `!$I6KxT
public void run(){ :n?K[f?LfY
long now = System.currentTimeMillis(); z}[qk:
if ((now - lastExecuteTime) > executeSep) { U|HF;L
//System.out.print("lastExecuteTime:"+lastExecuteTime); Cw_XLMY%V1
//System.out.print(" now:"+now+"\n"); (~<9\ZJs
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6W abw:
lastExecuteTime=now; 4z##4^9g
executeUpdate(); /kY|PY
} @^';[P!
else{ c#6g[TE@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); *1[v08?!
} `/z6Q"
} +#c3Y;JP
} i@C$O.m(
//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 +s'qcC
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类写好了,下面是在JSP中如下调用。
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<% -OS&(7
CountBean cb=new CountBean(); u0(PWCi2
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); d* 6 lJT
CountCache.add(cb); Pkbx/\
out.print(CountCache.list.size()+"<br>"); oe:@7stG
CountControl c=new CountControl(); @!:~gQ
c.run(); 2AAZZx +$
out.print(CountCache.list.size()+"<br>"); De(\<H#
%>