SoapUI

mockRequest.with {
    if (method.toString() == 'PUT' || method.toString() == 'DELETE') {
        InputStreamReader isr = new InputStreamReader(request.getInputStream(), "UTF-8")
        BufferedReader br = new BufferedReader(isr)
        StringBuilder sb = new StringBuilder()
        while ((s=br.readLine()) != null) {
            sb.append(s)
        }

        def requestBody = new groovy.json.JsonSlurper().parseText(sb.toString())
        log.info "requestBody: " + requestBody

        def whatever = requestBody.whatever
        // more code
    }
}