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Qiniu Cloud Storage SDK for Java
There is a newer version: 7.17.0
package com.qiniu.util;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public final class StringMap {
    private Map map;

    public StringMap() {
        this(new HashMap());
    }

    public StringMap(Map map) {
        this.map = map;
    }

    public StringMap put(String key, Object value) {
        map.put(key, value);
        return this;
    }

    public StringMap putNotEmpty(String key, String value) {
        if (!StringUtils.isNullOrEmpty(value)) {
            map.put(key, value);
        }
        return this;
    }

    public StringMap putNotNull(String key, Object value) {
        if (value != null) {
            map.put(key, value);
        }
        return this;
    }


    public StringMap putWhen(String key, Object val, boolean when) {
        if (when) {
            map.put(key, val);
        }
        return this;
    }

    public StringMap putAll(Map map) {
        this.map.putAll(map);
        return this;
    }

    public StringMap putAll(StringMap map) {
        this.map.putAll(map.map);
        return this;
    }

    public void forEach(Consumer imp) {
        for (Map.Entry i : map.entrySet()) {
            imp.accept(i.getKey(), i.getValue());
        }
    }

    public int size() {
        return map.size();
    }

    public Map map() {
        return this.map;
    }

    public Object get(String key) {
        return map.get(key);
    }

    public Set keySet() {
        return map.keySet();
    }

    public String formString() {
        final StringBuilder b = new StringBuilder();
        forEach(new Consumer() {
            private boolean notStart = false;

            @Override
            public void accept(String key, Object value) {
                if (notStart) {
                    b.append("&");
                }
                try {
                    b.append(URLEncoder.encode(key, "UTF-8")).append('=')
                            .append(URLEncoder.encode(value.toString(), "UTF-8"));
                } catch (UnsupportedEncodingException e) {
                    throw new AssertionError(e);
                }
                notStart = true;
            }
        });
        return b.toString();
    }

    public String jsonString() {
        return Json.encode(this);
    }

    public interface Consumer {
        void accept(String key, Object value);
    }
}