Configuring Servlets

You define servlets as a part of a Web application in several entries in the J2EE standard Web Application deployment descriptor, web.xml. The web.xml file is located in the WEB-INF directory of your Web application.
The first entry, under the root servlet element in web.xml, defines a name for the servlet and specifies the compiled class that executes the servlet. The servlet element also contains definitions for initialization attributes and security roles for the servlet.
The second entry in web.xml, under the servlet-mapping element, defines the URL pattern that calls this servlet.

Configuring Global Servlets

In order to automagically add a Servlet to your Microservice, implement the interface ServletConfiguration on a Spring bean. If the bean implementing ServletConfiguration is also a Servle only the method getMapping() need be implemented. This will be the context URL of your Servlet. public Class getServlet()

Override the above method to configure a specified Servlet class. Typically used for Servlets in external jar files.

public String getName()


To change the Servlet name to something other than the Class name.

public Map getInitParameters()

To configure the init parameters for the Servlet


 public Map getInitParameters(){
		return ImmutableMap.of();
	}

    @Component
    public class AutodiscoveredServlet extends HttpServlet 
                           implements ServletConfiguration {

	@Override
	public String[] getMapping() {
		return new String[] { "/servlet" };
	}

	@Override
	protected void doGet(HttpServletRequest req, 
                                 HttpServletResponse resp)
			throws ServletException, IOException {

		resp.setContentType("text/html");
		resp.getWriter().write("hello world");
	}
    }
    
 

Configuring Local Servlets

These Servlets will only be available on the Microservice modules they are configured against.


public Map getServlets()

To configure module local servlets and their contexts Urls .

public Class[] getServletConfigurationClass()

Configuring Servlets in a Plugin

Servlets can be configured inside a plugin both as explicitly defined Servlets, or as auto discovered Spring Beans that implement ServletConfiguration.
Override the filters method to provide a lookup function for the Servlets

public Function> servlets(){
return serverData -> myMapOfFilters;
}


or override springClasses and add your ServletConfiguration Spring beans there

References : github

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