java json对象转换数组

public static Map getMap4Json(String jsonString){  
        JSONObject jsonObject = new JSONObject( jsonString );    
        Iterator  keyIter = jsonObject.keys();  
        String key;  
        Object value;  
        Map valueMap = new HashMap();  
        while( keyIter.hasNext())  
        {  
            key = (String)keyIter.next();  
            value = jsonObject.get(key);  
            valueMap.put(key, value);  
        }  
        return valueMap;  
    }