Java URL Query Build getQueryString(final Map parameters)

Description

Construct a new new URL from the baseUrl with the additional query string parameters.

License

Apache License

Parameter

Parameter	Description
baseUrl	The baseUrl.
parameters	The additional parameters to add to the query string.

Return

The new URL.

Declaration

public static String getQueryString(final Map<String, ? extends Object> parameters) 

Method Source Code

//package com.java2s;
/*//www .  j a va 2s .c  om
 * Copyright 2004-2005 Revolution Systems Inc.
 *
 * Licensed 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.
 */

import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;

import java.util.Collection;

import java.util.Map;
import java.util.Map.Entry;

public class Main {
    /**
     * Construct a new new URL from the baseUrl with the additional query string
     * parameters.
     *
     * @param baseUrl The baseUrl.
     * @param parameters The additional parameters to add to the query string.
     * @return The new URL.
     */
    public static String getQueryString(final Map<String, ? extends Object> parameters) {
        final StringBuilder query = new StringBuilder();
        appendQuery(query, parameters);
        return query.toString();
    }

    public static void appendQuery(final StringBuilder query, final Map<String, ? extends Object> parameters)
            throws Error {
        if (parameters != null) {
            boolean firstParameter = true;
            for (final Entry<String, ? extends Object> parameter : parameters.entrySet()) {
                final String name = parameter.getKey();
                final Object value = parameter.getValue();
                if (name != null && value != null) {
                    if (!firstParameter) {
                        query.append('&');
                    } else {
                        firstParameter = false;
                    }
                    try {
                        if (value instanceof String[]) {
                            final String[] values = (String[]) value;
                            for (int i = 0; i < values.length; i++) {
                                query.append(name).append('=').append(URLEncoder.encode(values[i], "US-ASCII"));
                                if (i < values.length - 1) {
                                    query.append('&');
                                }
                            }
                        } else if (value instanceof Collection) {
                            boolean first = true;
                            final Collection<?> values = (Collection<?>) value;
                            for (final Object childValue : values) {
                                if (childValue != null) {
                                    if (first == true) {
                                        first = false;
                                    } else {
                                        query.append('&');
                                    }
                                    query.append(name).append('=')
                                            .append(URLEncoder.encode(childValue.toString(), "US-ASCII"));
                                }
                            }

                        } else {
                            query.append(name).append('=').append(URLEncoder.encode(value.toString(), "US-ASCII"));
                        }
                    } catch (final UnsupportedEncodingException e) {
                        throw new Error(e);
                    }

                }
            }
        }
    }

    public static void appendQuery(final StringBuilder query, final String name, final Object value) {
        final boolean firstParameter = query.length() == 0;
        if (name != null && value != null) {
            if (!firstParameter) {
                query.append('&');
            }
            try {
                if (value instanceof String[]) {
                    final String[] values = (String[]) value;
                    for (int i = 0; i < values.length; i++) {
                        query.append(name).append('=').append(URLEncoder.encode(values[i], "US-ASCII"));
                        if (i < values.length - 1) {
                            query.append('&');
                        }
                    }
                } else if (value instanceof Collection) {
                    boolean first = true;
                    final Collection<?> values = (Collection<?>) value;
                    for (final Object childValue : values) {
                        if (childValue != null) {
                            if (first == true) {
                                first = false;
                            } else {
                                query.append('&');
                            }
                            query.append(name).append('=')
                                    .append(URLEncoder.encode(childValue.toString(), "US-ASCII"));
                        }
                    }

                } else {
                    query.append(name).append('=').append(URLEncoder.encode(value.toString(), "US-ASCII"));
                }
            } catch (final UnsupportedEncodingException e) {
                throw new Error(e);
            }

        }
    }
}

Related

1. getQueryParametersFromUrl(String url)
2. getQueryParams(String httpUrl)
3. getQueryParams(String query)
4. getQueryParams(String s)
5. getQueryParams(String url)
6. getQueryString(final Map parameters, final boolean encode)
7. getQueryString(Map parameters)
8. getQueryString(Map parameters)
9. getQueryString(String url)