效果

代码

@Test
    public void test() {
        JSONObject jsonObject = new JSONObject(true);
        jsonObject.put("a","123");
        jsonObject.put("db","11");
        jsonObject.put("dd","asdasd");
        jsonObject.put("b1","123123");
        System.out.println(jsonObject.toJSONString());
        System.out.println(json2pathValue(jsonObject));
    }

    /**
     * JSON对象转为网址传参格式（按key的首字母从小到大排序）
     * @param jsonObject
     * @return
     */
    public String json2pathValue(JSONObject jsonObject){
        Map map = jsonObject.toJavaObject(Map.class);
        Set<String> set = map.keySet();
        List<String> keyList = new ArrayList<>(set);
        List<String> collect = keyList.stream().sorted().collect(Collectors.toList());
        StringBuilder stringBuilder = new StringBuilder();
        for (String s : collect) {
            stringBuilder.append(s).append("=").append(map.get(s).toString()).append("&");
        }
        stringBuilder.deleteCharAt(stringBuilder.lastIndexOf("&"));
        return stringBuilder.toString();
    }