Ibatis通用对象封装

  public class MapBean extends HashMap<String, Object> {     
    public MapBean() {     
    }     
      
    public MapBean(Object... args) {     
        put(args);     
    }     
      
    public int getInt(Object key) {     
        return getInt(key, 0);     
    }     
      
    public int getInt(Object key, int defaultInt) {     
        Integer i = (Integer) get(key);     
        return i == null ? defaultInt : i;     
    }     
      
    public String getString(Object key) {     
        return (String) get(key);     
    }     
      
    public String getString(Object key, String defaultValue) {     
        String value = (String) get(key);     
        return value == null ? defaultValue : value;     
    }     
      
    public Timestamp getTimestamp(Object key) {     
        return (Timestamp) get(key);     
    }     
      
    public void put(Object... args) {     
        for (int i = 1; i < args.length; i += 2) {     
            put(String.valueOf(args[i - 1]), args[i]);     
        }     
    }     
      
    public JSONObject toJson() {     
        return JSONObject.fromObject(this);     
    }     
      
    public JSONObject toJson(String... keys) {     
        xxx     
    }     
      
    public String toJsonString() {     
        return toJson().toString();     
    }     
}