写一个转换工具遇到的 记录下   http://tool.liyongqiang.com/tool/findUrltoMap

 //String 转json
        String str="{\"website\":\"tool.liyongqiang.com\"}";
        JSONObject json = JSON.parseObject(str);
        System.out.println(json.toString());

        //String  转map
        String str1="{key3=value3, key2={key3=value3, key2=value2, key1=value1},key1=value1}";
        Map map = (Map<String, Object>) getValue(str1);
        System.out.println(map.toString());

        //map  转  json
        JSONObject json1 =  JSONObject.parseObject(JSON.toJSONString(map));;
        System.out.println(json1.toString());
        //json 转 map
        String str2 = "{\"0\":\"zhangsan\",\"1\":\"lisi\",\"2\":\"wangwu\",\"3\":\"maliu\"}";
        Map mapType = JSON.parseObject(str2,Map.class);
        System.out.println(mapType.toString());

 public static Object getValue(String param) {
        Map map = new HashMap();
        String str = "";
        String key = "";
        Object value = "";
        char[] charList = param.toCharArray();
        boolean valueBegin = false;
        for (int i = 0; i < charList.length; i++) {
            char c = charList[i];
            if (c == '{') {
                if (valueBegin == true) {
                    value = getValue(param.substring(i, param.length()));
                    i = param.indexOf('}', i) + 1;
                    map.put(key, value);
                }
            } else if (c == '=') {
                valueBegin = true;
                key = str;
                str = "";
            } else if (c == ',') {
                valueBegin = false;
                value = str;
                str = "";
                map.put(key, value);
            } else if (c == '}') {
                if (str != "") {
                    value = str;
                }
                map.put(key, value);
                return map;
            } else if (c != ' ') {
                str += c;
            }
        }
        return map;
    }