tomcat中获取不同的数据源java代码

LOG.debug("数据文件存入IC_CARD_POOL过程开始.................");

    String productNo = (String)ctx.getAttribute("product_no");

    long millis0 = System.currentTimeMillis();
    Integer batchNo = Integer.valueOf(Integer.parseInt(ctx.getJobNo()));
    String jobDate = (String)ctx.getAttribute("job_date");
    String companyNo = (String)ctx.getAttribute("companyNo");

    Connection connections = null;
    DataSource datasource = null;
    try
    {
      InitialContext namingContexts = new InitialContext();

      datasource = (DataSource)namingContexts.lookup("IC_DATASOURCE");
    } catch (NamingException e1) {
      e1.printStackTrace();
    }
    try {
      connections = datasource.getConnection();

      DateFormat f = new SimpleDateFormat("yyyyMMdd");
     
     
      其中IC_DATASOURCE在tomcat/conf中的context.xml中配置
      如下所示：
       <resource
                name="IC_DATASOURCE"
                type="javax.sql.DataSource"
    impl="org.apache.commons.dbcp.BasicDataSource"
                driverClassName="oracle.jdbc.driver.OracleDriver"
                url="jdbc:oracle:thin:@10.225.8.142:1521:iccard"
                username="tsmbat"
                password="tsmbat"
                maxIdle="200"
                maxWait="5000"
                maxActive="50"
                testOnReturn="true"
                testWhileIdle="true"
                testOnBorrow="true"
                validationQuery="SELECT COUNT(*) FROM DUAL"/>