如何把Date类型转换为字符串

public static void main(String[] args) {
        String jsons = "{\"date\":22,\"day\":2,\"hours\":10,\"minutes\":46,\"month\":8,\"nanos\":0,\"seconds\":0,\"time\":1442889960000,\"timezoneOffset\":-480,\"year\":115}";
        JSONObject jsonObject = JSONObject.fromObject(jsons);
        System.out.println(jsonObject);
        int year = 0,month = 0,day = 0;
        if(jsonObject.containsKey("year")){//判断是否有这个值.
            year = jsonObject.getInt("year");
        }
        if(jsonObject.containsKey("month")){//判断是否有这个值.
            month = jsonObject.getInt("month");
        }
        if(jsonObject.containsKey("day")){//判断是否有这个值.
            day = jsonObject.getInt("day");
        }
        System.out.println("日期是:"+year+"年"+month+"月"+day+"日");
    }

需要导入org.json的jar包。