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: ExHKw~y9
)
'j:
CountBean.java [~:-&
$A3<G-4O
/* i{D=l7j|w
* CountData.java +GsWTEz
* jGrN\D?h
* Created on 2007年1月1日, 下午4:44 RzhWD^b B
* @"T"7c?Cv
* To change this template, choose Tools | Options and locate the template under i(?,6)9
* the Source Creation and Management node. Right-click the template and choose {cpEaOyOM
* Open. You can then make changes to the template in the Source Editor. aA-
*/ #_mi `7!B#
DF6c|
package com.tot.count; qS&%!
r_EcMIuk
/** fw oQ'&
* 8A{_GH{:
* @author ,@m@S^
*/ A`{y9@h(
public class CountBean { s:00yQ
private String countType; c*d9'}E
int countId; 3:%QB9qc]'
/** Creates a new instance of CountData */ j@Qg0F
public CountBean() {} &R~n>>c
public void setCountType(String countTypes){ EBtLzbj
this.countType=countTypes; yfU<UQ!1
} Yxv9
public void setCountId(int countIds){ = 07Gy, =i
this.countId=countIds; (;VVCAoy
} `Q+moX
public String getCountType(){ kj+#TnF-
return countType; VL[)[~^
} CIjZG ?A
public int getCountId(){ 'WHHc 9rG,
return countId; `>DP,D)w(
} g+-;J+X8
} I ];M7
ylKmj]A
CountCache.java 9+,R`v
t6c<kIQ:-O
/* v){ .Z^_C
* CountCache.java jkiTj~WE-
* RFh"&0[
* Created on 2007年1月1日, 下午5:01 rQTr8DYH
* /yLZ/<WN
* To change this template, choose Tools | Options and locate the template under 6 \B0^
* the Source Creation and Management node. Right-click the template and choose @DW[Z`X
* Open. You can then make changes to the template in the Source Editor. OL7_'2_z.
*/ ~lEVXea!
%AF5=
package com.tot.count; Ld^GV
import java.util.*; R{,ooxH\J
/** tweY'x.{
* d2X[(3
* @author s<x1>Q7X~
*/ nS()u}c;r
public class CountCache { U $Qv>7
public static LinkedList list=new LinkedList(); zF4 [}*
/** Creates a new instance of CountCache */ ,fEO>
i
public CountCache() {} Z -%(~
public static void add(CountBean cb){ 61U<5:#l
if(cb!=null){ ,2oF:H
list.add(cb); R~bC,`Bh
} ,n!vsIN
} HaA1z}?n
} )hwV`2>l
M>jtFP<S
CountControl.java )a}"^1
\U%#nU{
/* %iJ%{{f`
* CountThread.java (2?G:+C 7
* W:i?t8y\y
* Created on 2007年1月1日, 下午4:57 X5YiFLH>y\
* ThW,Y"
l
* To change this template, choose Tools | Options and locate the template under 1
4LI5T
* the Source Creation and Management node. Right-click the template and choose *zO&N^X.4
* Open. You can then make changes to the template in the Source Editor. cYNJhGY
*/ ,?
E&V_5
9>/wUQs!]
package com.tot.count; iE0ab,OF
import tot.db.DBUtils; \3Oij^l0
import java.sql.*; @|yeqy_:
/** -{h
* WS& kx~oQ
* @author TJ?g%
*/ =Nz0.:
public class CountControl{ !gwjN_ZJ^
private static long lastExecuteTime=0;//上次更新时间 3E}EBJLsZ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 D j\e@?Y
/** Creates a new instance of CountThread */ DjMf,wX-{
public CountControl() {} #G9 adK5
public synchronized void executeUpdate(){ 57F%j3.|/
Connection conn=null; vUC!fIG
PreparedStatement ps=null; /R
X1UQ.s
try{ df+t:a
conn = DBUtils.getConnection(); P`U<7xF~
conn.setAutoCommit(false); NV4g~ +n
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); PIcrA2ll
for(int i=0;i<CountCache.list.size();i++){ 2EQ6J
CountBean cb=(CountBean)CountCache.list.getFirst(); 0;sRJ
CountCache.list.removeFirst(); 8GJdRL(
ps.setInt(1, cb.getCountId()); .AV)'j#6P
ps.executeUpdate();⑴ a:SQ16_?
//ps.addBatch();⑵ ^GN8V-X4y
} QbYc[8-[
//int [] counts = ps.executeBatch();⑶ /Tz85 [%6
conn.commit(); `n!viW|tB
}catch(Exception e){ '%v#v 3'
e.printStackTrace(); QGiAW7b5
} finally{ c*\<,n_
try{ b7C
e%Br
if(ps!=null) { U7&x rif
ps.clearParameters(); "rXOsX\;
ps.close(); ;??ohA"{5
ps=null; ps1YQ3Ep&
} E_$z`or
}catch(SQLException e){} 'f?.R&