tomcat 中 配制 dbcp

本文以tomcat5.0和informix数据库为例，介绍tomcat 单个JNDI数据源和多数据源的配置。   
一、Tomcat配置一个jndi数据源方法  

第一步：在C:"Tomcat 5.0"conf"server.xml中<Host>….</Host>中增加如下内容，注意：<DefaultContext>属于<Host>下的一级元素。

<DefaultContext>

               <Resource name = "jdbc/testdb0_cs" auth="Container"

                      type="javax.sql.DataSource"/>

               <ResourceParams name="jdbc/testdb0_cs">

                      <parameter>

                             <name>factory</name>

                             <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>

                      </parameter>

                      <parameter>

                             <name>driverClassName</name>

                            <value>com.informix.jdbc.IfxDriver</value>

                      </parameter>

                      <parameter>

                             <name>url</name>

                             <value>jdbc:informix-sqli://192.177.191.130:6666/testdb0_cs:INFORMIXSERVER=ccbhr_test</value>

                      </parameter>

                      <parameter>

                             <name>username</name>

                             <value>hrmis</value>

                      </parameter>

                      <parameter>

                             <name>password</name>

                             <value>hrmis</value>

                      </parameter>

                      <parameter>

                             <name>maxActive</name>

                             <value>20</value>

                      </parameter>

                      <parameter>

                             <name>maxIdle</name>

                             <value>10</value>

                      </parameter>

                      <parameter>

                             <name>poolPrepareStatements</name>

                             <value>true</value>

                      </parameter>

                      <parameter>

                          <name>removeAbandoned</name>

                          <!-- Abandoned DB connections are removed and recycled -->

                          <value>true</value>

                    </parameter>

                    <parameter>

                          <name>removeAbandonedTimeout</name>

                          <!-- Use the removeAbandonedTimeout parameter to set the number of seconds a DB connection has been idle before it is considered abandoned. -->

                          <value>60</value>

                    </parameter>

                    <parameter>

                          <name>logAbandoned</name>

                          <!-- Log a stack trace of the code which abandoned -->

                          <value>false</value>

                    </parameter>

               </ResourceParams>

        </DefaultContext>

第二步：修改C:"eclipse-SDK-3.0.1-win32"eclipse"workspace"zlp"WebContent"WEB-INF下web.xml，在<web-app>…..</web-app>中增加一级元素如下：

<!-- Database Config start -->

<resource-ref>

<description>connectDB test</description>

<res-ref-name>jdbc/testdb0_cs</res-ref-name>

<res-type>javax.sql.DataSource</res-type>

<res-auth>Container</res-auth>

</resource-ref>

<!-- Database Config end -->

说明：蓝色的路径是你的应用所在路径下的web.xml

第三步：将Informix JDBC Driver拷贝到C:"Tomcat 5.0"common"lib目录下

 

第四步：重新启动tomcat

 

二、Tomcat中配置多个数据源的方法 

第一步：server.xml 蓝色和绿色部分是两个数据源，分别连接两个不同的数据库。依次类推，配置多个。

<DefaultContext>

          <Resource name="jdbc/testdb0_cs1" auth="Container" type="javax.sql.DataSource"/>

          <ResourceParams name="jdbc/testdb0_cs1">

            <parameter>

              <name>factory</name>

              <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>

            </parameter>

            <parameter>

              <name>driverClassName</name>

              <value>com.informix.jdbc.IfxDriver</value>

            </parameter>

            <parameter>

              <name>url</name>

              <value>jdbc:informix-sqli://192.177.179.208:6666/testdb0_cs1:INFORMIXSERVER=ccbhr_test</value>

            </parameter>

            <parameter>

              <name>username</name>

              <value>informix</value>

            </parameter>

            <parameter>

              <name>password</name>

              <value>google</value>

            </parameter>

            <parameter>

              <name>maxActive</name>

              <value>20</value>

            </parameter>

            <parameter>

              <name>maxIdle</name>

              <value>10</value>

            </parameter>

            <parameter>

              <name>poolPrepareStatements</name>

              <value>true</value>

            </parameter>

            <parameter>

              <name>removeAbandoned</name>

              <!-- Abandoned DB connections are removed and recycled -->

              <value>true</value>

            </parameter>

            <parameter>

              <name>removeAbandonedTimeout</name>

              <!-- Use the removeAbandonedTimeout parameter to set the number of seconds a DB connection has been idle before it is considered abandoned. -->

              <value>60</value>

            </parameter>

            <parameter>

              <name>logAbandoned</name>

              <!-- Log a stack trace of the code which abandoned -->

              <value>false</value>

            </parameter>

          </ResourceParams>

          <Resource name="jdbc/testdb0_cs" auth="Container" type="javax.sql.DataSource"/>

          <ResourceParams name="jdbc/testdb0_cs">

            <parameter>

              <name>factory</name>

              <value>org.apache.commons.dbcp.BasicDataSourceFactory</value>

            </parameter>

            <parameter>

              <name>driverClassName</name>

              <value>com.informix.jdbc.IfxDriver</value>

            </parameter>

            <parameter>

              <name>url</name>

              <value>jdbc:informix-sqli://192.177.191.130:6666/testdb0_cs:INFORMIXSERVER=ccbhr_test</value>

            </parameter>

            <parameter>

              <name>username</name>

              <value>informix</value>

            </parameter>

            <parameter>

              <name>password</name>

              <value>informix</value>

            </parameter>

            <parameter>

              <name>maxActive</name>

              <value>20</value>

            </parameter>

            <parameter>

              <name>maxIdle</name>

              <value>10</value>

            </parameter>

            <parameter>

              <name>poolPrepareStatements</name>

              <value>true</value>

            </parameter>

            <parameter>

              <name>removeAbandoned</name>

              <!-- Abandoned DB connections are removed and recycled -->

              <value>true</value>

            </parameter>

            <parameter>

              <name>removeAbandonedTimeout</name>

              <!-- Use the removeAbandonedTimeout parameter to set the number of seconds a DB connection has been idle before it is considered abandoned. -->

              <value>60</value>

            </parameter>

            <parameter>

              <name>logAbandoned</name>

              <!-- Log a stack trace of the code which abandoned -->

              <value>false</value>

            </parameter>

          </ResourceParams>

        </DefaultContext>

 

第二步：在应用的web.xml中增加新增的数据源，如下所示：

 <!-- Database Config start --> 

<resource-ref>

<description>connectDB test</description>

<res-ref-name>jdbc/testdb0_cs</res-ref-name>

<res-type>javax.sql.DataSource</res-type>

<res-auth>Container</res-auth>

</resource-ref>

 <resource-ref>

<description>connectDB test</description>

<res-ref-name>jdbc/testdb0_cs1</res-ref-name>

<res-type>javax.sql.DataSource</res-type>

<res-auth>Container</res-auth>

</resource-ref>

<!-- Database Config end -->

第三步：重启tomcat 

三、多个数据源的访问方法参考

public Connection getConn(String dsnName)

       {

              Connection conn = null;

              Context ctx = null;

              DataSource ds = null;

              String jndiStr = null;

              try{

                     jndiStr = "java:comp/env/jdbc/" + dsnName.trim();

                     System.out.println("jndiStr=[" + jndiStr + "]");

                     ctx = new InitialContext();

                     ds = (DataSource) ctx.lookup(jndiStr);

                      

                     conn = ds.getConnection();

              }

              catch(Exception e)

              {

                     System.out.println("Connect database [" + dsnName.trim() + "] Error:" + e);

              }    

              return conn;   

       }

       说明：其中dsnName是我们要具体访问的数据源JNDI，例如：testdb0_cs1

-Created by Scorpio Zhen