如何从tomcat Webapp中的context.xml文件获取资源? [英] How to get resource from the context.xml file in tomcat webapp?

问题描述

这是我的 context.xml 文件:

...
<Resource auth="Container"
          driverClass="net.sourceforge.jtds.jdbc.Driver"
          type="com.jolbox.bonecp.BoneCPDataSource"
          idleMaxAge="240"
          idleConnectionTestPeriod="60"
          partitionCount="3"
          acquireIncrement="1"
          maxConnectionsPerPartition="10"
          minConnectionsPerPartition="3"
          statementsCacheSize="50"
          releaseHelperThreads="4"

          name="jdbc/MyDatasource"
          username="my_username"
          password="my_password"
          factory="org.apache.naming.factory.BeanFactory"
          jdbcUrl="jdbc:jtds:sqlserver://localhost:12345/my_database"
/>
...

我已经尝试使用

I already tried using ServletContext.getResource(java.lang.String) with the name of the resource ("jdbc/MyDatasource"), but Tomcat complains that the name doesn't begin with a '/'. I also tried with "/jdbc/MyDatasource", but this time it returns null.

我主要需要 jdbcUrl 来执行与数据库服务器的连接检查(请查看服务器是否在线且可运行).

I mainly need the jdbcUrl to perform a connection check with the database server (see if the server is online and operational).

推荐答案

关键字是:JNDI. context.xml中的资源不是系统资源"，而是JNDI资源. 试试这个:

Keyword is: JNDI. The resources in the context.xml are not 'System Resources' but JNDI Resources. Try this:

InitialContext ic = new InitialContext();
// that's everything from the context.xml and from the global configuration
Context xmlContext = (Context) ic.lookup("java:comp/env");
DataSource myDatasource = (DataSource) xmlContext.lookup("jdbc/MyDatasource");

// now get a connection to see if everything is fine.
Connection con = ds.getConnection();
// reaching this point means everything is fine.
con.close();

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