Java URL Query Build mapToQueryString(Map parameters, String charSet)

Description

map To Query String

License

Apache License

Declaration

public static String mapToQueryString(Map parameters, String charSet) 

Method Source Code

//package com.java2s;
//License from project: Apache License 

import java.io.UnsupportedEncodingException;
import java.lang.reflect.Array;

import java.net.URLEncoder;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Enumeration;

import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;

public class Main {
    public static String mapToQueryString(Map parameters, String charSet) {
        String queryString = "";
        if (parameters != null && !parameters.isEmpty()) {
            Set<Entry> entrySet = parameters.entrySet();
            for (Entry entry : entrySet) {
                try {
                    String key = entry.getKey().toString();
                    Object value = entry.getValue();
                    List values = makeStringList(value);
                    for (Object v : values) {
                        queryString += key + "=" + URLEncoder.encode(v == null ? "" : v.toString(), charSet) + "&";
                    }// w w  w  .  ja  va 2s .c o m
                } catch (UnsupportedEncodingException e) {
                    throw new IllegalArgumentException("invalid charset : " + charSet);
                }
            }
            if (queryString.length() > 0) {
                queryString = queryString.substring(0, queryString.length() - 1);
            }
        }
        return queryString;
    }

    private static List<String> makeStringList(Object value) {
        if (value == null) {
            value = "";
        }
        List<String> result = new ArrayList<String>();
        if (value.getClass().isArray()) {
            for (int j = 0; j < Array.getLength(value); j++) {
                Object obj = Array.get(value, j);
                result.add(obj != null ? obj.toString() : "");
            }
            return result;
        }

        if (value instanceof Iterator) {
            Iterator it = (Iterator) value;
            while (it.hasNext()) {
                Object obj = it.next();
                result.add(obj != null ? obj.toString() : "");
            }
            return result;
        }

        if (value instanceof Collection) {
            for (Object obj : (Collection) value) {
                result.add(obj != null ? obj.toString() : "");
            }
            return result;
        }

        if (value instanceof Enumeration) {
            Enumeration enumeration = (Enumeration) value;
            while (enumeration.hasMoreElements()) {
                Object obj = enumeration.nextElement();
                result.add(obj != null ? obj.toString() : "");
            }
            return result;
        }
        result.add(value.toString());
        return result;
    }
}

Related

1. getQueryString(String url)
2. getQueryUrl(String word)
3. getQueryUrl(String word, Integer page)
4. getQueryURL(URL baseUrl, String[] parameters)
5. getQueryValues(String input)
6. mapToQueryString(Map parameters, String charSet)
7. mapToQueryString(Map queryString)
8. toQueryString(Map map)
9. toQueryString(Map requestMap)