JMeter example source code file (RenderAsJSON.java)

This example JMeter source code file (RenderAsJSON.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - JMeter tags/keywords

esc_char_regex, non-nls-1, non-nls-1, normal_character_regex, other_value_regex, override, pattern, regex, renderasjson, string, string, string_regex, string_regex, stringbuilder, stringbuilder

The JMeter RenderAsJSON.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed  under the  License is distributed on an "AS IS" BASIS,
 * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY KIND, either  express  or
 * implied.
 *
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.jmeter.visualizers;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.jmeter.samplers.SampleResult;
import org.apache.jmeter.util.JMeterUtils;

public class RenderAsJSON extends SamplerResultTab implements ResultRenderer {

    private static final String ESC_CHAR_REGEX = "\\\\[\"\\\\/bfnrt]|\\\\u[0-9A-Fa-f]{4}"; // $NON-NLS-1$

    private static final String NORMAL_CHARACTER_REGEX = "[^\"\\\\]";  // $NON-NLS-1$

    private static final String STRING_REGEX = "\"(" + ESC_CHAR_REGEX + "|" + NORMAL_CHARACTER_REGEX + ")*\""; // $NON-NLS-1$

    // This 'other value' regex is deliberately weak, even accepting an empty string, to be useful when reporting malformed data.
    private static final String OTHER_VALUE_REGEX = "[^\\{\\[\\]\\}\\,]*"; // $NON-NLS-1$

    private static final String VALUE_OR_PAIR_REGEX = "((" + STRING_REGEX + "\\s*:)?\\s*(" + STRING_REGEX + "|" + OTHER_VALUE_REGEX + ")\\s*,?\\s*)"; // $NON-NLS-1$

    private static final Pattern VALUE_OR_PAIR_PATTERN = Pattern.compile(VALUE_OR_PAIR_REGEX);

    /** {@inheritDoc} */
    public void renderResult(SampleResult sampleResult) {
        String response = ViewResultsFullVisualizer.getResponseAsString(sampleResult);
        showRenderJSONResponse(response);
    }

    private void showRenderJSONResponse(String response) {
        results.setContentType("text/plain"); // $NON-NLS-1$
        results.setText(response == null ? "" : prettyJSON(response));
        results.setCaretPosition(0);
        resultsScrollPane.setViewportView(results);
    }

    // It might be useful also to make this available in the 'Request' tab, for
    // when posting JSON.
    private static String prettyJSON(String json) {
        StringBuilder pretty = new StringBuilder(json.length() * 2); // Educated guess

        final String tab = ":   "; // $NON-NLS-1$
        StringBuilder index = new StringBuilder();
        String nl = ""; // $NON-NLS-1$

        Matcher valueOrPair = VALUE_OR_PAIR_PATTERN.matcher(json);

        boolean misparse = false;

        for (int i = 0; i < json.length(); ) {
            final char currentChar = json.charAt(i);
            if ((currentChar == '{') || (currentChar == '[')) {
                pretty.append(nl).append(index).append(currentChar);
                i++;
                index.append(tab);
                misparse = false;
            }
            else if ((currentChar == '}') || (currentChar == ']')) {
                if (index.length() > 0) {
                    index.delete(0, tab.length());
                }
                pretty.append(nl).append(index).append(currentChar);
                i++;
                int j = i;
                while ((j < json.length()) && Character.isWhitespace(json.charAt(j))) {
                    j++;
                }
                if ((j < json.length()) && (json.charAt(j) == ',')) {
                    pretty.append(","); // $NON-NLS-1$
                    i=j+1;
                }
                misparse = false;
            }
            else if (valueOrPair.find(i) && valueOrPair.group().length() > 0) {
                pretty.append(nl).append(index).append(valueOrPair.group());
                i=valueOrPair.end();
                misparse = false;
            }
            else {
                if (!misparse) {
                    pretty.append(nl).append("- Parse failed from:");
                }
                pretty.append(currentChar);
                i++;
                misparse = true;
            }
            nl = "\n"; // $NON-NLS-1$
        }
        return pretty.toString();
    }

    /** {@inheritDoc} */
    @Override
    public String toString() {
        return JMeterUtils.getResString("view_results_render_json"); // $NON-NLS-1$
    }

}