1.mysq问题(转)

 严重: The web application [/codeMarket] created a ThreadLocal with key of type [null] (value [com.opensymphony.xwork2.inject.ContainerImpl$10@e1666]) and

 a value of type [java.lang.Object[]] (value [[Ljava.lang.Object;@e0ada6]) but failed to remove it when the web application was stopped.

 This is very likely to create a memory leak.

2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoader clearThreadLocalMap

严重: The web application [/codeMarket] created a ThreadLocal with key of type [null]

(value [com.opensymphony.xwork2.inject.ContainerImpl$10@a8a314]) and a value of type [java.lang.Object[]]

(value [[Ljava.lang.Object;@16ab2e8]) but failed to remove it when the web application was stopped.

This is very likely to create a memory leak.

第一个异常  严重: The web application [/codeMarket] registered the JBDC driver [oracle.jdbc.OracleDriver]

but failed to unregister it when the web application was stopped.

To prevent a memory leak, the JDBC Driver has been forcibly unregistered

程序运行了jdbc驱动，可是当程序停止时，无法注销这个驱动，tomcat为了防止内存溢出，就给强制注销了

由于JDBC连接池用的是dbcp，dbcp1.3/1.4连接池没有自动的去回收空闲连接的功能,在1.3.1、1.4.1版本做了修复

(可以替换成新版本试试，亦可以按以下方案重写，也可以考虑使用c3p0，它有自动回收空闲连接功能）

解决方法:重写了org.apache.commons.dbcp.BasicDataSource  的 close()方法：

package org.company.util;

import java.sql.DriverManager;

import java.sql.SQLException;

import org.apache.commons.dbcp.BasicDataSource;

public class XBasicDataSource extends BasicDataSource{

 @Override

 public synchronized void close() throws SQLException{

//  System.out.println("......输出数据源Driver的url："+DriverManager.getDriver(url));

  DriverManager.deregisterDriver(DriverManager.getDriver(url));

  super.close();

 }

}

在dbcp数据源中的配置：

<bean id="myDataSource"

  class="org.company.util.XBasicDataSource" destroy-method="close">

  <property name="driverClassName"

   value="oracle.jdbc.driver.OracleDriver">

  </property>

  <property name="url"

   value="jdbc:oracle:thin:@XX.XXX.XX.X:1521:ccdb">

  </property>

  <property name="username" value="codemanage"></property>

  <property name="password" value="codemanage"></property>

  <property name="maxActive" value="10"></property>

  <property name="initialSize" value="5"></property>

  <property name="removeAbandoned" value="true"></property>

  <property name="removeAbandonedTimeout" value="3600"></property>

 </bean>

 即可解决问题

第二个问题

再重新加载的时候发现还有：

严重: The web application [/codeMarket] registered the JBDC driver [com.mysql.jdbc.Driver] but failed to unregister it when the web application was stopped.

To prevent a memory leak, the JDBC Driver has been forcibly unregistered.

2012-2-9 17:43:12 org.apache.catalina.loader.WebappClassLoader clearReferencesJdbc

检查了一下jar包  发现多了一个mysql-connector-java-bin.jar  因为我用的是oracle 但是把mysql和oracle的jar包都加进去了 删掉即可 

 

2.js实现点击页面除了某位置的其他位置而触发操作：(就本例而言：该位置id为selectCategory 操作的位置class为search_drop)

if(document.addEventListener){        document.addEventListener("click", function(e) {        var allClick = document.getElementById("selectCategory");        var target = e.target || e.srcElement;                while (target != document && target != allClick) {            target = target.parentNode;        }        if (target == document) {            $(".search_drop").hide();        }            }, false);    }else if(document.attachEvent){        document.attachEvent("onclick",function(e) {            var allClick = document.getElementById("selectCategory");            var target = e.target || e.srcElement;            while (target != document && target != allClick) {                target = target.parentNode;            }            if (target == document) {                $(".search_drop").hide();            }                });

亲测兼容ie6到ie10 , firefox ，chrome

3.toggleClass ：为元素添加class 以及移除class

<div class="tumble">Some text.</div>  ---->  $('div.tumble').toggleClass('bounce') ----->

<div class="tumble bounce">Some text.</div> ---->  $('div.tumble').toggleClass('bounce') ----->

<div class="tumble">Some text.</div>

 

4.siblings: $(A).siblings(B) 筛选出与A同辈的满足B选择器的元素,

若B为空，而且A可以选出准确的元素，该表达式得到与A同辈的所有元素但不包括A

如果A未选择出一个准确的元素,则包含所有元素

例如 :<li>2</li><li class="second-item">2</li><li>3</li><li>4</li><li>5</li>

$("li").siblings().  ……  该表达式得到与A同辈的所有元素而且包括A，即所有li

$("li.second-item").siblings(). 该表达式得到与A同辈的所有元素但不包括A

5.模拟qq的好友分组功能：

                                    
     
            
      
                
       
My Friend
                
       
DA
ER
TY
CD
                
       
Classmates
                
       
DA
ER
                
       
Strangers
                
       
TY
CD