Create URL query string from Map<String,String> - Java java.net

Java examples for java.net:URL Query

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Description

Create URL query string from Map<String,String>

Demo Code

//package com.java2s;
import java.io.UnsupportedEncodingException;

import java.net.URLEncoder;

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

public class Main {
    private static final String DEFAULT_ENCODING = "UTF-8";

    public static String query(Map<String, String> params) {
        return query(params, DEFAULT_ENCODING);
    }//from ww w .ja v a  2  s.  c  o  m

    public static String query(Map<String, String> params, String encoding) {

        String query = "";

        if (params != null && params.size() > 0) {

            StringBuilder sb = new StringBuilder();

            boolean first = true;

            for (Entry<String, String> entry : params.entrySet()) {

                if (!first) {
                    sb.append('&');
                } else {
                    first = false;
                }

                try {
                    sb.append(URLEncoder.encode(entry.getKey(), encoding));
                    sb.append('=');
                    sb.append(URLEncoder.encode(entry.getValue(), encoding));
                } catch (UnsupportedEncodingException e) {
                    throw new RuntimeException(e);
                }
            }

            if (sb.length() > 0) {
                query = sb.toString();
            }

        }

        return query;
    }
}

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