public static Map<String,Object> mapStringToMap(String stringMap){

        Map<String,Object> map = new HashMap<>();

        String[] strings = stringMap.split(",");

        for (String str : strings) {

            String[] s = str.split("=");

            map.put(s[0],s[1]);

        }

        return map;

}

public static void main(String[] args) {

        Map<String,Object> hashMap = new HashMap<>();

        hashMap.put("name", "张三");

        hashMap.put("age", 20);

        hashMap.put("addr", "湖北武汉1号");

        String stringMap = hashMap.toString();

        Map<String, Object> stringObjectMap = mapStringToMap(stringMap);

        System.out.println(stringObjectMap);

}