Java URL Build buildQuery(Map paramMap)

Description

build valid http request querystrings from a hashmap that contains name value pairs Copied from Play Router class TODO: array support

License

Apache License

Parameter

Parameter	Description
paramMap	a parameter

Declaration

public static String buildQuery(Map<String, Object> paramMap) 

Method Source Code

//package com.java2s;
/**//w  ww .  j a  v  a  2s .  co m
 * Copyright 2010 Bing Ran<bing_ran@gmail.com> 
 * 
 * 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.List;
import java.util.Map;

public class Main {
    /**
     * 
     * build valid http request querystrings from a hashmap that contains name value pairs
     * 
     * Copied from Play Router class
     * 
     * TODO: array support
     * 
     * @param paramMap
     * @return
     */
    public static String buildQuery(Map<String, Object> paramMap) {
        StringBuilder queryString = new StringBuilder();
        for (Map.Entry<String, Object> entry : paramMap.entrySet()) {
            String key = entry.getKey();
            Object value = entry.getValue();
            if (value != null) {
                if (List.class.isAssignableFrom(value.getClass())) {
                    List<Object> vals = (List<Object>) value;
                    for (Object e : vals) {
                        try {
                            queryString.append(URLEncoder.encode(key, "utf-8"));
                            queryString.append("=");
                            if (e.toString().startsWith(":")) {
                                queryString.append(e.toString() + "");
                            } else {
                                queryString.append(URLEncoder.encode(e.toString() + "", "utf-8"));
                            }
                            queryString.append("&");
                        } catch (UnsupportedEncodingException ex) {
                        }
                    }
                } else {
                    try {
                        queryString.append(URLEncoder.encode(key, "utf-8"));
                        queryString.append("=");
                        if (value.toString().startsWith(":")) {
                            queryString.append(value.toString() + "");
                        } else {
                            queryString.append(URLEncoder.encode(value.toString() + "", "utf-8"));
                        }
                        queryString.append("&");
                    } catch (UnsupportedEncodingException ex) {
                    }
                }
            }
        }
        String qs = queryString.toString();
        if (qs.endsWith("&")) {
            qs = qs.substring(0, qs.length() - 1);
        }
        return qs;
    }
}

Related

1. buildQuery(final Map query)
2. buildQuery(final Map query)
3. buildQuery(Map paramMap)
4. buildQuery(Map query)
5. buildQuery(Map params)
6. buildQueryString(Map parameters)