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2008-04-28 20:37:20

下载本文示例代码
  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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