java - 如何使用 jython 从 pyservlet 的 url 中删除 .py

Question

我正在查看 jython servlet 教程，一切正常。我如何使 url 成为

本地主机:8080/jythondemo/JythonServlet1

代替

localhost:8080/jythondemo/JythonServlet1.py

http://seanmcgrath.blogspot.com/JythonWebAppTutorialPart1.html

这是来自 web.xml 的相关部分

<web-app>      
    <servlet>
        <servlet-name>ServletTest</servlet-name>
        <servlet-class>ServletTest</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>PyServlet</servlet-name>
        <servlet-class>org.python.util.PyServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>ServletTest</servlet-name>
        <url-pattern>/ServletTest</url-pattern>
    </servlet-mapping>

    <servlet-mapping>
        <servlet-name>PyServlet</servlet-name>
        <url-pattern>/*</url-pattern>
    </servlet-mapping>
</web-app>

我也试过

<servlet-mapping>
    <servlet-name>PyServlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

经过上述更改，pyservlet 似乎正在获取 url JythonServlet1，但它不知道如何处理它。这是错误消息:

javax.servlet.ServletException: I can't guess the name of the class from /.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/testjython3/JythonServlet1
org.python.util.PyServlet.createInstance(PyServlet.java:202)
org.python.util.PyServlet.loadServlet(PyServlet.java:188)
org.python.util.PyServlet.getServlet(PyServlet.java:178)
org.python.util.PyServlet.service(PyServlet.java:155)

Answer 1

如@Jigar 所述，实际的 Jython Servlet 代码中存在限制。但是，您可以通过创建一个简单的 URL 转换器来解决这个问题。它包含一个 Servlet，在内部将请求转发给 Py Servlet。

为 web.xml 使用以下代码:

<web-app>      
    <servlet>
        <servlet-name>AliasServlet</servlet-name>
        <servlet-class>juanal.AliasServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>PyServlet</servlet-name>
        <servlet-class>org.python.util.PyServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>AliasServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <servlet-mapping>
        <servlet-name>PyServlet</servlet-name>
        <url-pattern>*.py</url-pattern>
    </servlet-mapping>
</web-app>

创建一个新类，比如 juanal.AliasServlet，包含以下内容:

package juanal;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AliasServlet extends HttpServlet
{

    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        String URI = request.getRequestURI();
        String newURI = URI + ".py";
        getServletConfig().getServletContext().getRequestDispatcher(newURI).forward(request, response);
    }
}

因此，对于这样的 URL:localhost:8080/jythondemo/JythonServlet1，它会在内部将请求转发到 JythonServlet1.py