Tomcat 5.5 基本详细配置(6)

在 Tomcat 中添加 JNDI 数据源
2. 在 Web 项目中配置 resouce-ref
在项目的 web.xml 的根节点下添加以下内容：

    <resource-ref>
        <res-ref-name>jdbc/mysql</res-ref-name>
        <res-type>javax.sql.DataSource</res-type>
        <res-auth>Container</res-auth>
        <res-sharing-scope>Shareable</res-sharing-scope>
    </resource-ref>

注意：这里 res-ref-name 必须与在 tomcat 中设置的 JNDI Name:jdbc/mysql(JNDI 名随便起 ) 一致。

3. 设置 $TOMCAT_HOME$/conf/server.xml
因为 TOMCAT 不会自动将 Data Source Resource 信息加到 Context 中，所以经常会忽略这一步
当前 server.xml 的内容为：
<?xml version="1.0" encoding="UTF-8"?>
<Server>
  <Listener className="org.apache.catalina.core.AprLifecycleListener"/>
  <Listener className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"/>
  <Listener className="org.apache.catalina.storeconfig.StoreConfigLifecycleListener"/>
  <Listener className="org.apache.catalina.mbeans.ServerLifecycleListener"/>
  <GlobalNamingResources>
    <Environment
      name="simpleValue"
      type="java.lang.Integer"
      value="30"/>
    <Resource
      auth="Container"
      description="User database that can be updated and saved"
      name="UserDatabase"
      type="org.apache.catalina.UserDatabase"
      pathname="conf/tomcat-users.xml"
      factory="org.apache.catalina.users.MemoryUserDatabaseFactory"/>

      <Resource name="jdbc/qeesoo" type="javax.sql.DataSource"
        password="123" driverClassName="com.mysql.jdbc.Driver"
        maxIdle="2" maxWait="5000" username="root"
        url="jdbc:mysql://127.0.0.1:3306/qeesoo?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=UTF-8" maxActive="4"/>

  </GlobalNamingResources>
  <Service
      name="Catalina">
    <Connector
        port="8080"
        redirectPort="8443"
        minSpareThreads="25"
        connectionTimeout="60000"
        connectionLinger="-1"
        serverSoTimeout="0"
        maxSpareThreads="75"
        maxThreads="150"
        tcpNoDelay="true"
        maxHttpHeaderSize="8192">
    </Connector>
    <Connector
        port="8009"
        redirectPort="8443"
        protocol="AJP/1.3">
    </Connector>
    <Engine
        defaultHost="localhost"
        name="Catalina">
      <Realm className="org.apache.catalina.realm.UserDatabaseRealm"/>
      <Host
          appBase="webapps"
          name="localhost">
        <Context
            docBase="/test"
            path="/test"
            reloadable="true"
            debug="5"
            crossContext="true">
            <Resource name="jdbc/qeesoo" type="javax.sql.DataSource"
        password="123" driverClassName="com.mysql.jdbc.Driver"
        maxIdle="2" maxWait="5000" username="root"
        url="jdbc:mysql://127.0.0.1:3306/qeesoo?autoReconnect=true&amp;useUnicode=true&amp;characterEncoding=UTF-8" maxActive="4"/>

        </Context>
      </Host>
    </Engine>
  </Service>
</Server>
4. 在 java 代码中使用 JNDI 资源获得 DataSource

        javax.naming.InitialContext ctx = new javax.naming.InitialContext();
        DataSource ds = (DataSource) ctx.lookup("java:comp/env/jdbc/mysql");
        Connection conn = ds.getConnection();

项目的web.xml的配置顺序：

icon (0 or 1 times) 
display-name (0 or 1 times) 
description (0 or 1 times) 
distributable (0 or 1 times) 
context-param (0 or more times) 
filter (0 or more times) 
filter-mapping (0 or more times) 
listener (0 or more times) 
servlet (0 or more times) 
servlet-mapping (0 or more times) 
session-config (0 or 1 times) 
mime-mapping (0 or more times) 
welcome-file-list (0 or 1 times) 
error-page (0 or more times) 
taglib (0 or more times) 
resource-env-ref (0 or more times) 
resource-ref (0 or more times) 
security-constraint (0 or more times) 
login-config (0 or 1 times) 
security-role (0 or more times) 
env-entry (0 or more times) 
ejb-ref (0 or more times) 
ejb-local-ref (0 or more times)