//3. 将读取出来的json字符串转换为ItcastDataObj SingleOutputStreamOperator<ItcastDataObj> vehicleDataStream = source.map( new MapFunction<String, ItcastDataObj>() { @Override public ItcastDataObj map(String line) throws Exception { return JsonParseUtil.parseJsonToObject(line); } } ); //-- 另种写法 DataStream<ItcastDataObj> vehicleDataStream02 = source.map(JsonParseUtil::parseJsonToObject);