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: 4df)?/
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CountBean.java .v%H%z~Rl#
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/* *{8Kb>D
* CountData.java Eym<DPu$n
* hm >JBc:n-
* Created on 2007年1月1日, 下午4:44 `uy)][j-
* ulV)X/]1
* To change this template, choose Tools | Options and locate the template under xz5 Jli
* the Source Creation and Management node. Right-click the template and choose jXkz,]Iy
* Open. You can then make changes to the template in the Source Editor. 9l9nT
*/ uPc}a3'?
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package com.tot.count; 0&2(1
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/** abkl)X>k
* V #W,}+_Sz
* @author _eM\ /(v[
*/ vFLQq,?Nh
public class CountBean { uyMxBc%6
private String countType; qc\]~]H]r
int countId; " m<]B
/** Creates a new instance of CountData */ LO<R<zz
public CountBean() {} @6 uB78U4O
public void setCountType(String countTypes){ k'{'6JR
this.countType=countTypes; .ml24SeC
} %N_5p'W
public void setCountId(int countIds){ (:Rj:8{
this.countId=countIds; #z_lBg. K
} >&3M
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public String getCountType(){ T1jAY^^I
return countType; m07=
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} yKF"\^`@
public int getCountId(){ Yo3my>N&g
return countId; Cqy84!Z<
} ms8de>A|H
} C-lv=FJEk/
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CountCache.java o<bZ. t
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/* GZ,`?
* CountCache.java m(SGE,("w
* ol7%$:S
* Created on 2007年1月1日, 下午5:01 T Z{';oU
* 0(A`Ia
* To change this template, choose Tools | Options and locate the template under hu0z):>y
* the Source Creation and Management node. Right-click the template and choose E|Mu1I]e
* Open. You can then make changes to the template in the Source Editor. ;`',M6g
*/ <dl:';@a-
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package com.tot.count; ;rZR9fR
import java.util.*; OjTb2[Q
/** |l)SX\Qf`@
* L#mf[a@pCn
* @author HZC^Q7]hy
*/ ~``oKiPg@
public class CountCache { +U{8Mj
public static LinkedList list=new LinkedList(); ;"46H'>!
/** Creates a new instance of CountCache */ $Y* d ' >
public CountCache() {} N|-M|1w96
public static void add(CountBean cb){ 5'wWj}0!%
if(cb!=null){ Uo?g@D
list.add(cb); !qk+>6~A,
} K8M[xaI@
} jsB%RvX
} vFm8 T58 7
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CountControl.java /ap3>xkt
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/* Vc0C@*fVM
* CountThread.java x9Um4!/t
* l# u$w&
* Created on 2007年1月1日, 下午4:57 I^S
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* 0'q&7
MV
* To change this template, choose Tools | Options and locate the template under jez=q
* the Source Creation and Management node. Right-click the template and choose mh&wvT<:{
* Open. You can then make changes to the template in the Source Editor. 6BK-(>c(6
*/ 8AL`<8$
/vC|_G|{
package com.tot.count; {2"8^;
import tot.db.DBUtils; J=?`~?Vbo
import java.sql.*; >tc#Ofgzd
/** f_v@.vnn.
* 1;8=,&
* @author D! TFb E
*/
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public class CountControl{ ]S!:p>R
private static long lastExecuteTime=0;//上次更新时间 *UBukn
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 RlW0U-%u
/** Creates a new instance of CountThread */ ]e`&py E
public CountControl() {} d [K71
public synchronized void executeUpdate(){ &h^E_]P
Connection conn=null; v$~1{}iI5
PreparedStatement ps=null; Ai>=n;
try{ iQs^2z#Bd
conn = DBUtils.getConnection(); NMJX `
conn.setAutoCommit(false); w]<V~X
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); V$wW?+V
for(int i=0;i<CountCache.list.size();i++){ LF6PKS
CountBean cb=(CountBean)CountCache.list.getFirst(); CVUA7eG+
CountCache.list.removeFirst(); ]mIcK
ps.setInt(1, cb.getCountId()); ws}cMX]*
ps.executeUpdate();⑴ Xa o*h(Q@L
//ps.addBatch();⑵ WEy$SN+P
} {3,_i66
//int [] counts = ps.executeBatch();⑶ 0Va+l)F
conn.commit(); ZAATV+Z
}catch(Exception e){ (j<FS>##
e.printStackTrace(); ].ZfTrM]
} finally{ 3XykIj1
try{ =Q+i(UGHi
if(ps!=null) { Hwb+@'o
ps.clearParameters(); 80J87\)
ps.close(); M9[52D!{
ps=null; ?XCFRt,ol
} @nWhUH%
}catch(SQLException e){} /Z3 Mlm{
DBUtils.closeConnection(conn); |!t&ZpdD
} >qE f991SZ
} au=A+
public long getLast(){ [d"]AF[#
return lastExecuteTime; 2Xw=kw u
} RBOb/.$
public void run(){ T'i^yd}*v
long now = System.currentTimeMillis(); GK6/S_l%D+
if ((now - lastExecuteTime) > executeSep) { {*yFTP"93
//System.out.print("lastExecuteTime:"+lastExecuteTime); hHA!.u4&
//System.out.print(" now:"+now+"\n"); 4Fu:ov
]M
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6chcpP0
lastExecuteTime=now; h2S!<
executeUpdate(); TA4>12C6
} Y5mQY5u|
else{ jpwR\"UJ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ;*{"|l qe
} Tumv0=q4wd
} )wZ;}O
} a7Mn/ i.
//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 "FD`1
SI)QX\is8
类写好了,下面是在JSP中如下调用。 1>yh`Bp\=
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<% 5S9i>B
CountBean cb=new CountBean(); T 6ihEb$C
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ^Uq%-a
CountCache.add(cb); mV>l`&K=
out.print(CountCache.list.size()+"<br>"); we("#s1=
CountControl c=new CountControl(); {{:QtkN
c.run(); #}xw
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out.print(CountCache.list.size()+"<br>"); s78MXS?py
%>