RequestParameterHandler

Background and Use Cases

The system retrieves request parameters through the WebUtils utility class, which supports parameter parsing, transformation, addition/removal, and permission filtering. RequestParameterHandler is primarily used for custom handling of report request parameters.

Interface Definition

package com.fr.stable.fun;

import com.fr.stable.fun.mark.Immutable;
import javax.servlet.http.HttpServletRequest;

public interface RequestParameterHandler extends Immutable {

    String XML_TAG = "RequestParameterHandler";
    int CURRENT_LEVEL = 1;

    Object getParameterFromRequest(HttpServletRequest req, String name);
    Object getParameterFromRequestInputStream(HttpServletRequest req, String name);
    Object getParameterFromAttribute(HttpServletRequest req, String name);
    Object getParameterFromJSONParameters(HttpServletRequest req, String name);
    Object getParameterFromSession(HttpServletRequest req, String name);
    Object getParameterFromHeader(HttpServletRequest req, String name);
}

Supported Versions

Plugin Registration

Add the following node in plugin.xml:

<extra-core>
    <RequestParameterHandler class="your class name"/>
</extra-core>

How It Works

WebUtils is the standard utility class for reading request information and parameters. It obtains the RequestParameterHandler instance via NetworkHelper; if none is registered, DefaultRequestParameterHandler is used.

Note: It is recommended to extend DefaultRequestParameterHandler rather than AbstractRequestParameterHandler, using the adapter pattern to override only the necessary methods. All access to request information must use WebUtils or finekit methods to ensure compatibility.

Useful Links

• Demo: demo-request-parameter-handler