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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： CountBean.java
/** CountData.java** Created on 2006年10月18日, 下午4:44** To change this template, choose Tools | Options and locate the template under* the Source Creation and Management node. Right-click the template and choose* Open. You can then make changes to the template in the Source Editor.*/ package com.tot.count;
/**** @author */public class CountBean { private String countType; int countId; /** Creates a new instance of CountData */ public CountBean() {} public void setCountType(String countTypes){ this.countType=countTypes; } public void setCountId(int countIds){ this.countId=countIds; } public String getCountType(){ return countType; } public int getCountId(){ return countId; }} CountCache.java
/** CountCache.java** Created on 2006年10月18日, 下午5:01** To change this template, choose Tools | Options and locate the template under* the Source Creation and Management node. Right-click the template and choose* Open. You can then make changes to the template in the Source Editor.*/package com.tot.count;import java.util.*;/**** @author */public class CountCache { public static LinkedList list=new LinkedList(); /** Creates a new instance of CountCache */ public CountCache() {} public static void add(CountBean cb){ if(cb!=null){ list.add(cb); } }} CountControl.java /* * CountThread.java * * Created on 2006年10月18日, 下午4:57 * * To change this template, choose Tools | Options and locate the template under * the Source Creation and Management node. Right-click the template and choose * Open. You can then make changes to the template in the Source Editor. */package com.tot.count;import tot.db.DBUtils;import java.sql.*;/**** @author */public class CountControl{ private static long lastExecuteTime=0;//上次更新时间 private static long executeSep=60000;//定义更新间隔时间，单位毫秒 /** Creates a new instance of CountThread */ public CountControl() {} public synchronized void executeUpdate(){ Connection conn=null; PreparedStatement ps=null; try{ conn = DBUtils.getConnection(); conn.setAutoCommit(false); ps=conn.prepareStatement("update t_news set hits=hits 1 where id=?"); for(int i=0;i＜CountCache.list.size();i ){ CountBean cb=(CountBean)CountCache.list.getFirst(); CountCache.list.removeFirst(); ps.setInt(1, cb.getCountId()); ps.executeUpdate();⑴ //ps.addBatch();⑵ } //int [] counts = ps.executeBatch();⑶ conn.commit(); }catch(Exception e){ e.printStackTrace(); } finally{ try{ if(ps!=null) { ps.clearParameters();ps.close();ps=null; } }catch(SQLException e){} DBUtils.closeConnection(conn); }}public long getLast(){ return lastExecuteTime;}public void run(){ long now = System.currentTimeMillis(); if ((now - lastExecuteTime) ＞ executeSep) { //System.out.print("lastExecuteTime:" lastExecuteTime); //System.out.print(" now:" now "\n"); // System.out.print(" sep=" (now - lastExecuteTime) "\n"); lastExecuteTime=now; executeUpdate(); } else{ //System.out.print("wait for " (now - lastExecuteTime) " seconds:" "\n"); }}}//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 类写好了，下面是在JSP中如下调用。
＜%CountBean cb=new CountBean();cb.setCountId(Integer.parseInt(request.getParameter("cid")));CountCache.add(cb);out.print(CountCache.list.size() "＜br＞");CountControl c=new CountControl();c.run();out.print(CountCache.list.size() "＜br＞");%＞
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： CountBean.java
/** CountData.java** Created on 2006年10月18日, 下午4:44** To change this template, choose Tools | Options and locate the template under* the Source Creation and Management node. Right-click the template and choose* Open. You can then make changes to the template in the Source Editor.*/ package com.tot.count;
/**** @author */public class CountBean { private String countType; int countId; /** Creates a new instance of CountData */ public CountBean() {} public void setCountType(String countTypes){ this.countType=countTypes; } public void setCountId(int countIds){ this.countId=countIds; } public String getCountType(){ return countType; } public int getCountId(){ return countId; }} CountCache.java
/** CountCache.java** Created on 2006年10月18日, 下午5:01** To change this template, choose Tools | Options and locate the template under* the Source Creation and Management node. Right-click the template and choose* Open. You can then make changes to the template in the Source Editor.*/package com.tot.count;import java.util.*;/**** @author */public class CountCache { public static LinkedList list=new LinkedList(); /** Creates a new instance of CountCache */ public CountCache() {} public static void add(CountBean cb){ if(cb!=null){ list.add(cb); } }} CountControl.java /* * CountThread.java * * Created on 2006年10月18日, 下午4:57 * * To change this template, choose Tools | Options and locate the template under * the Source Creation and Management node. Right-click the template and choose * Open. You can then make changes to the template in the Source Editor. */package com.tot.count;import tot.db.DBUtils;import java.sql.*;/**** @author */public class CountControl{ private static long lastExecuteTime=0;//上次更新时间 private static long executeSep=60000;//定义更新间隔时间，单位毫秒 /** Creates a new instance of CountThread */ public CountControl() {} public synchronized void executeUpdate(){ Connection conn=null; PreparedStatement ps=null; try{ conn = DBUtils.getConnection(); conn.setAutoCommit(false); ps=conn.prepareStatement("update t_news set hits=hits 1 where id=?"); for(int i=0;i＜CountCache.list.size();i ){ CountBean cb=(CountBean)CountCache.list.getFirst(); CountCache.list.removeFirst(); ps.setInt(1, cb.getCountId()); ps.executeUpdate();⑴ //ps.addBatch();⑵ } //int [] counts = ps.executeBatch();⑶ conn.commit(); }catch(Exception e){ e.printStackTrace(); } finally{ try{ if(ps!=null) { ps.clearParameters();ps.close();ps=null; } }catch(SQLException e){} DBUtils.closeConnection(conn); }}public long getLast(){ return lastExecuteTime;}public void run(){ long now = System.currentTimeMillis(); if ((now - lastExecuteTime) ＞ executeSep) { //System.out.print("lastExecuteTime:" lastExecuteTime); //System.out.print(" now:" now "\n"); // System.out.print(" sep=" (now - lastExecuteTime) "\n"); lastExecuteTime=now; executeUpdate(); } else{ //System.out.print("wait for " (now - lastExecuteTime) " seconds:" "\n"); }}}//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 类写好了，下面是在JSP中如下调用。
＜%CountBean cb=new CountBean();cb.setCountId(Integer.parseInt(request.getParameter("cid")));CountCache.add(cb);out.print(CountCache.list.size() "＜br＞");CountControl c=new CountControl();c.run();out.print(CountCache.list.size() "＜br＞");%＞
下载本文示例代码
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