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: +rY0/T_0,
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CountBean.java jwox?] f+
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/* WG{/I/bJ_
* CountData.java mio'm
* cf'Z#NfQ
* Created on 2007年1月1日, 下午4:44 ?Gfe?
* V:J6eks_
* To change this template, choose Tools | Options and locate the template under U s5JnP 5
* the Source Creation and Management node. Right-click the template and choose sSK$
* Open. You can then make changes to the template in the Source Editor. 8msDJ{,X
*/ t79MBgZ
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package com.tot.count; |VL,\&7rk
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/**
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* }D O# {@af
* @author Yw<:I&
*/ R[;Z<K\Nn?
public class CountBean {
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private String countType; ?_r"Fg;"
int countId; _K>m9Q2
/** Creates a new instance of CountData */ 1<"kN^
public CountBean() {} !%@{S8IP.v
public void setCountType(String countTypes){ @Q!j7I
this.countType=countTypes; K~>kruO";
} HvTQycG
public void setCountId(int countIds){ j@2 hI,+
this.countId=countIds; ~k3r$e@
} Y# #J
public String getCountType(){ o<4LL7$A!
return countType; s>X;m.<
} 4E)[<%
public int getCountId(){ zU%aobZ
return countId; .YkKIei
} 7>LhXC
} 4$"Lf'sH6
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CountCache.java 8] *{i
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/*
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* CountCache.java N\?iU8w=
* Y>+D\|%Q
* Created on 2007年1月1日, 下午5:01 c#DTL/8"DO
* )".gjW8{#L
* To change this template, choose Tools | Options and locate the template under 4\?B,!
* the Source Creation and Management node. Right-click the template and choose o%.cQo=v*
* Open. You can then make changes to the template in the Source Editor. Ow
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*/ 9[!
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package com.tot.count; /%7eo?@,
import java.util.*; m[pzu2R
/** WJ*DWyd''
* `uj`ixcR
* @author =bzTfki
*/ \Mi< ROp5
public class CountCache { N?XN$hwdZ
public static LinkedList list=new LinkedList(); ,]MX&]
/** Creates a new instance of CountCache */ mR^D55k
public CountCache() {} k#.co~kS
public static void add(CountBean cb){ @&+
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if(cb!=null){ <3bh-)
list.add(cb); ~"N]%Cu
} 3,?y !
} saV `-#
} /dqKFxB1
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CountControl.java ec=C7M
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/* zM!*r~*k$
* CountThread.java Fi#t88+1
* 7qk61YBLz
* Created on 2007年1月1日, 下午4:57 ?9mY #_Of
* Km?i{TW
* To change this template, choose Tools | Options and locate the template under rtpjx%
* the Source Creation and Management node. Right-click the template and choose VtVnht1
* Open. You can then make changes to the template in the Source Editor. M3V[p9>
*/ xR.Ql>
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package com.tot.count; .^uu*S_
import tot.db.DBUtils; F
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import java.sql.*; m^7pbJ\|
/** t*x;{{jL#(
* "hvw2lyp3
* @author iY2bRXA
*/ >i~c>+R
public class CountControl{ 'Zzm'pC
private static long lastExecuteTime=0;//上次更新时间 $Z j.
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 mF1oY[xa_
/** Creates a new instance of CountThread */ *8N~Zmz
public CountControl() {} }S&{ &gh
public synchronized void executeUpdate(){ l^_X?L@
Connection conn=null; li{_biey}
PreparedStatement ps=null; ji2#O.
try{ l|K8+5L
conn = DBUtils.getConnection(); 0jXIx2y
conn.setAutoCommit(false); ^uj+d"a)
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); (|x-> a
for(int i=0;i<CountCache.list.size();i++){ yH`xk%q_
CountBean cb=(CountBean)CountCache.list.getFirst(); K5KN}sRs"
CountCache.list.removeFirst(); fZZ!kea[
ps.setInt(1, cb.getCountId()); {p-%\nOC
ps.executeUpdate();⑴ 1/i|
//ps.addBatch();⑵ TnG"_VK9R
} vfj Ipg%i
//int [] counts = ps.executeBatch();⑶ ]X5*e'
conn.commit(); AL;"S;8
}catch(Exception e){ rQWft r^
e.printStackTrace(); JUE>g8\b
} finally{ uPqPoI>N!
try{ ._yr7uY[M
if(ps!=null) { 0Zq"-
ps.clearParameters(); HwcGbbX)
ps.close(); eAqQ~)8^
ps=null; 'e&4#VLH^
} O<Kr6+
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}catch(SQLException e){} gW, ET
DBUtils.closeConnection(conn); Rl(b tr1w
} XBc+_=)$
} %*uqtw8
public long getLast(){ uJWX7UGuz
return lastExecuteTime; HGKm?'['
} ;gc2vDMv
public void run(){ "P|G^*"~2
long now = System.currentTimeMillis(); d0xV<{,-
if ((now - lastExecuteTime) > executeSep) { @@5u{K
//System.out.print("lastExecuteTime:"+lastExecuteTime); o{
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//System.out.print(" now:"+now+"\n"); X#o:-FKf
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); &K4o8Qz
lastExecuteTime=now; vhg4E80Kr
executeUpdate(); /Iskjcc60W
} QdRMp
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else{ JDP#tA3
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 0I
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} s?2;u p*D
} Ky DBCCOv
} }}]Y mf
//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 u
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类写好了,下面是在JSP中如下调用。 ge`J>2
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<% hImCy9i}
CountBean cb=new CountBean(); qg|+BIiUz
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); $?A]!Y;
CountCache.add(cb); YK- R|z6K
out.print(CountCache.list.size()+"<br>"); K{iYp4pU
CountControl c=new CountControl(); WsoB!m
c.run(); MVCCh+,GI
out.print(CountCache.list.size()+"<br>"); x4.
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