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Tomcat7.0 connects to mysql5.0

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1, mysql-connector-java-5.0.4-bin.jar into C: \ Program Files \ Apache Software Foundation \ Tomcat 7.0 \ lib

2. The project's web. xml is consistent with tomcat

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"        xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"        xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"        id="WebApp_ID" version="3.0">        <display-name>webt3</display-name>        <welcome-file-list>                <welcome-file>index.jsp</welcome-file>        </welcome-file-list>        <resource-ref>                <description>Tomcat 7 DBCP</description>                <res-ref-name>jdbc/mysql5</res-ref-name>                <res-type>javax.sql.DataSource</res-type>                <res-auth>Container</res-auth>        </resource-ref></web-app>
3. context. xml in tomcat/conj 
<?xml version='1.0' encoding='utf-8'?><!--  Licensed to the Apache Software Foundation (ASF) under one or more  contributor license agreements.  See the NOTICE file distributed with  this work for additional information regarding copyright ownership.  The ASF licenses this file to You under the Apache License, Version 2.0  (the "License"); you may not use this file except in compliance with  the License.  You may obtain a copy of the License at      http://www.apache.org/licenses/LICENSE-2.0  Unless required by applicable law or agreed to in writing, software  distributed under the License is distributed on an "AS IS" BASIS,  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the License for the specific language governing permissions and  limitations under the License.--><!-- The contents of this file will be loaded for each web application --><Context>    <!-- Default set of monitored resources -->    <WatchedResource>WEB-INF/web.xml</WatchedResource>    <!-- Uncomment this to disable session persistence across Tomcat restarts -->    <!--    <Manager pathname="" />    -->    <!-- Uncomment this to enable Comet connection tacking (provides events         on session expiration as well as webapp lifecycle) -->    <!--    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />    -->     <Resource name="jdbc/mysql5" auth="Container"              type="javax.sql.DataSource"                          maxActive="80" maxIdle="20" maxWait="10000" removeAbandoned="true"              username="root" password="5201314"                          driverClassName="com.mysql.jdbc.Driver"              url="jdbc:mysql://localhost:3306/webt3" /></Context>

4. Test: index. jsp 
<% @ Page language = "java" contentType = "text/html; charset = UTF-8" pageEncoding = "UTF-8" %> <% @ page import = "java. SQL. *, javax. SQL. *, javax. naming. * "%> <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN "" http://www.w3.org/TR/html4/loose.dtd "> <Html> 

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