我需要从运行在 Tomcat 6 上的 Web 应用程序访问 FTP 服务器.我想使用 JNDI 来执行此操作.
I need to access an FTP server from my Web Application which runs on Tomcat 6. I want to use JNDI to do this.
如何使用 JNDI 在 Tomcat 中配置此 FTP 连接?我必须在 web.xml
和 context.xml
中写入什么来配置资源?然后如何从 Java 源代码访问此连接?
How can I configure this FTP connection in Tomcat using JNDI?
What do I have to write into web.xml
and context.xml
to configure the resource? And how can I then access this connection from the Java source code?
来自这篇文章:http://codelevain.wordpress.com/2010/12/18/url-as-jndi-resource/
在您的 context.xml 中定义您的 FTP URL,如下所示:
Define your FTP URL in your context.xml like this :
<Resource name="url/SomeService" auth="Container"
type="java.net.URL"
factory="com.mycompany.common.URLFactory"
url="ftp://ftpserver/folder" />
提供 com.mycompany.common.URLFactory 实现并确保生成的类可用于 Tomcat:
Provide the com.mycompany.common.URLFactory implementation and make sure the resulting class is available to Tomcat :
import java.net.URL;
import java.util.Hashtable;
import javax.naming.*;
import javax.naming.spi.ObjectFactory;
public class URLFactory implements ObjectFactory {
public Object getObjectInstance(Object obj, Name name, Context nameCtx, Hashtable environment) throws Exception {
Reference ref = (Reference) obj;
String urlString = (String) ref.get("url").getContent();
return new URL(urlString);
}
}
在 web.xml 中创建您的参考
Create your reference in web.xml
<resource-ref>
<res-ref-name>
url/SomeService
</res-ref-name>
<res-type>
java.net.URL
</res-type>
<res-auth>
Container
</res-auth>
</resource-ref>
然后在您的代码中通过 JNDI 查找获取 FTP URL:
Then in your code obtain the FTP URL by doing a JNDI lookup:
InitialContext context = new InitialContext();
URL url = (URL) context.lookup("java:comp/env/url/SomeService");
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