Question

I have a Java Servlet, which is handling a REST request. However, this is breaking when it receives invalid data. This is POSTed in XML format, and to attempt to resolve this I have added a filter into the filter chain. The filter is being called, and I can access the data in the body of the request, accessing the XML.

I can validate this and manipulate it to ensure that the data is correct, but I cannot work out how to reset it back into the request object.

How can you set the body of an HttpServletRequest object?

Answer 1

You can wrap Your HttpServletRequest object with a new class lets name it: NewHttpServletRequest. The actual rewriting should be done in the appropriate overriden methods e.g getParameter(String)

package com.example;

import javax.servlet.http.HttpServletRequestWrapper;

public class MyHttpServletRequest extends HttpServletRequestWrapper {

    public MyHttpServletRequest(HttpServletRequest request) {
        super(request);
    }

    public String getParameter(String name) {
        String str = super.getParameter(name);
        // DO THE REWRITING
        return str;
    }

}