简略版本

配置信息

context.xml配置

存放位置webapp/MET-INF/context.xml

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<?xml version="1.0" encoding="UTF-8"?>
<Context>
	<Resource name="jdbc/UserPlatformDB"
              type="javax.sql.DataSource"  auth="Container"
              description="Derby database for User Platform"
              maxActive="100" maxIdle="30" maxWait="10000"
              username="" password="" 
              driverClassName="org.apache.derby.jdbc.EmbeddedDriver"
              url="jdbc:derby:user-platform;create=true"/>

</Context>
pom.xml配置

这个配置是嵌入工程tomcat一个插件，需要在开启jndi。

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<build>
    <plugins>
        <!-- Tomcat Maven 插件用于构建可执行 war -->
        <plugin>
            <groupId>org.apache.tomcat.maven</groupId>
            <artifactId>tomcat7-maven-plugin</artifactId>
            <version>2.1</version>
            <dependencies>
                <dependency>
                    <groupId>org.apache.derby</groupId>
                    <artifactId>derby</artifactId>
                    <version>${derby.version}</version>
                </dependency>
            </dependencies>
            <executions>
                <execution>
                    <id>tomcat-run</id>
                    <goals>
                        <!-- 最终打包成可执行的jar包 -->
                        <goal>exec-war-only</goal>
                    </goals>
                    <phase>package</phase>
                    <configuration>
                        <!-- ServletContext 路径 -->
                        <path>/</path>
                      	<!-- 开启jdni -->
                        <enableNaming>true</enableNaming>
                    </configuration>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

运行代码:

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protected Connection getConnection(){
    Context context = null;
    try {
        context = new InitialContext();
        Context envContext = (Context) context.lookup("java:comp/env");

        DataSource dataSource = (DataSource) envContext.lookup("jdbc/UserPlatformDB");
        Connection connection = dataSource.getConnection();
        if (connection != null){
            System.out.println("获取JNDI 成功！！");
        }
       return connection;
    } catch (NamingException | SQLException e) {
        servletContext.log(e.getMessage(), e);
        throw new RuntimeException(e);
    }

}