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Tomcat configuration DataSource

TomcatMySQLJDBCJavaEEWeb 
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1. configuration MySql Connection DataSource

 

 原理介绍

 java 调用 Tomcat 中的 ConnectionPool 通过Context 中去查找  jndi 的方式

 那么目标就明确了 Java ==jndi==> Tomcat ===> Databases

 1) 因为是连接池所以需要 $CATALINA_HOME/lib/tomcat-dbcp.jar 包

     把这个jar 包放到对就的Tomcat 目录下当然一般Tomcat 目录下有。

 2) 要连接数据库 所以要jdbc 驱动 $CATALINA_HOME/lib/ mysql-connector-java-5.1.6-bin.jar

     注意:tomcat 4.x 放在 $CATALINA_HOME/ common/lib目录下

   将这个jar 包放到Tomcat 目录下同上 OK 在以上物理条件都存在的条

    件了。。

 

 3) 配置逻辑条件 $CATALINA_HOME/conf/ context.xml 配置

 

<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/mysqlDB" auth="Container" type="javax.sql.DataSource"
               maxActive="100" maxIdle="30" maxWait="10000"
               username="root" password="123456" driverClassName="com.mysql.jdbc.Driver"
               url="jdbc:mysql://localhost:3306/test?autoReconnect=true"/>

</Context>

 

   4) 服务端配置好后 我们就来配置 工程下的web.xml 文件中来告诉Tomcat 容器 我要什么连接。

 

<?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_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>webJNdi</display-name>
  <description>MySQL Test App</description>
  <!-- 告诉 Tomcat Container 我要jdbc/mysqlDb 数据源 -->
  <resource-ref>
      <description>DB Connection</description>
      <res-ref-name>jdbc/mysqlDB</res-ref-name>
      <res-type>javax.sql.DataSource</res-type>
      <res-auth>Container</res-auth>
  </resource-ref>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

 

   5)测试页面

 

    方式一:

 

<%@page import="javax.naming.InitialContext"%>
<%@page import="javax.naming.Context"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>测试Tomcat Container</title>
</head>
<body>
<%
	Context ctx = new InitialContext();
	Context env = (Context)ctx.lookup("java:/comp/env");
	Object ob = env.lookup("jdbc/mysqlDB");
%>
<h1>Tomcat Container Connection MySqlObjectName:<%=ob %>
</body>
</html>

 

   方式二:

 

<%@page import="javax.naming.InitialContext"%>
<%@page import="javax.naming.Context"%>
<%@page import="java.sql.*"%>
<%@page import="javax.sql.*"%>
<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>测试Tomcat Container</title>
</head>
<body>
<%
	Context ctx = new InitialContext();
    DataSource ds = (DataSource)ctx.lookup( "java:/comp/env/jdbc/mysqlDB" );

%>
<h1>Tomcat Container Connection MySqlObjectName:<%=ds %>
</body>
</html>

 

 

   Tomcat 4.x 的配置方法

   与上面版本不同配置在server.xml 中添加内容

 

<Resource name="jdbc/MysqlDB"
               auth="Container"
               type="javax.sql.DataSource"/>

  <ResourceParams name="jdbc/MysqlDB">
    <parameter>
      <name>factory</name>
      <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>
    </parameter>

    <!-- Maximum number of dB connections in pool. Make sure you
         configure your mysqld max_connections large enough to handle
         all of your db connections. Set to 0 for no limit.
         -->
    <parameter>
      <name>maxActive</name>
      <value>100</value>
    </parameter>

    <!-- Maximum number of idle dB connections to retain in pool.
         Set to 0 for no limit.
         -->
    <parameter>
      <name>maxIdle</name>
      <value>30</value>
    </parameter>

    <!-- Maximum time to wait for a dB connection to become available
         in ms, in this example 10 seconds. An Exception is thrown if
         this timeout is exceeded.  Set to -1 to wait indefinitely.
         -->
    <parameter>
      <name>maxWait</name>
      <value>10000</value>
    </parameter>

    <!-- MySQL dB username and password for dB connections  -->
    <parameter>
     <name>username</name>
     <value>root</value>
    </parameter>
    <parameter>
     <name>password</name>
     <value>123456</value>
    </parameter>

    <!-- Class name for mm.mysql JDBC driver -->
    <parameter>
       <name>driverClassName</name>
       <value>org.gjt.mm.mysql.Driver</value>
    </parameter>

    <!-- The JDBC connection url for connecting to your MySQL dB.
         The autoReconnect=true argument to the url makes sure that the
         mm.mysql JDBC Driver will automatically reconnect if mysqld closed the
         connection.  mysqld by default closes idle connections after 8 hours.
         -->
    <parameter>
      <name>url</name>
      <value>jdbc:mysql://localhost:3306/test?autoReconnect=true</value>
    </parameter>
  </ResourceParams>

 

   同样在web.xml 中指定这里不变

 

 

 

   运行结果

 

Tomcat Container Connection 
MySqlObjectName:org.apache.tomcat.dbcp.dbcp.BasicDataSource@17f409c

 

 

 

 

 

 

 

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