Tomcat：通过JNDI使用FTP连接 [英] Tomcat: use FTP connection via JNDI

问题描述

我需要从我在Tomcat 6上运行的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.

如何配置此FTP使用JNDI在Tomcat中连接？
我需要写入 web.xml 和 context.xml 来配置资源？然后，我如何从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?

推荐答案

从这篇文章： http://codelevain.wordpress.com/2010/12/18/url-as-jndi -resource /

在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实现并确保结果类可供Tomcat使用：

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中创建引用

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执行JNDI查找来获取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");

这篇关于Tomcat：通过JNDI使用FTP连接的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！