postgresql - Apache Tomcat 连接到 PostgreSQL 数据库(通过 JDBC 驱动程序)

Question

我已经安装了 PostgreSQL 9.5.2 (rhel 6.7 x64) 和 Apache Tomcat 7.0.73(x64 rhel 6.7) 之后我下载了 postgresql-9.4.1212.jar jar 文件并粘贴到 Catalina_home/Lib 路径并添加这个跟随content.xml文件

<Resource auth="Container" name="jdbc/postgres" type="javax.sql.DataSource" user="sarkhan" password="1"
            driverClassName="org.postgresql.Driver" url="jdbc:postgresql://172.29.92.162:5432" maxActive="150"
            schema="test" maxIdle="4"/>

将以下内容添加到 web.xml 文件

<resource-ref>
    <description>postgreSQL Datasource</description>
    <res-ref-name>jdbc/postgres</res-ref-name>
    <res-type>javax.sql.DataSource</res-type>
    <res-auth>Container</res-auth>
</resource-ref>

那么我如何测试 Apache Tomcat 服务器是否已连接到 PostgreSQL 数据库服务器？

Answer 1

Tomcat 给出了JNDI Datasource HOW-TO 的引导，具体来说:

4. Accessing the datasource

   When accessing the datasource programmatically, remember to prepend java:/comp/env to your JNDI lookup, as in the following snippet of code. Note also that "jdbc/postgres" can be replaced with any value you prefer, provided you change it in the above resource definition file as well.

InitialContext cxt = new InitialContext();
if ( cxt == null ) {
   throw new Exception("Uh oh -- no context!");
}

DataSource ds = (DataSource) cxt.lookup( "java:/comp/env/jdbc/postgres" );

if ( ds == null ) {
   throw new Exception("Data source not found!");
}