java菜鸟求助如何将list数据放入json中??

Question

ObjectNode waterMeterNode = mapper.createObjectNode();
waterMeterNode.put("serviceId", "WaterMeter");
ObjectNode waterMeterData = mapper.createObjectNode();

waterMeterData.put("timeOfReading", md.getTimeOfReading());
waterMeterData.put("P1", md.getP1());
waterMeterData.put("P2", md.getP2());
waterMeterData.put("P3", md.getP3());
waterMeterData.put("A1", md.getA1());
waterMeterData.put("A2", md.getA2());
waterMeterData.put("A3", md.getA3());
这段代码需要生成json数据,不过get里面传过来的是list数据它就会报错,我应该怎么修改才能够将list数据放入json中?

Answer 1

1. List集合转换成json代码 List list = new ArrayList(); list.add( "first" ); list.add( "second" ); JSONArray jsonArray2 = JSONArray.fromObject( list );
2. Map集合转换成json代码 Map map = new HashMap(); map.put("name", "json"); map.put("bool", Boolean.TRUE); map.put("int", new Integer(1)); map.put("arr", new String[] { "a", "b" }); map.put("func", "function(i){ return this.arr[i]; }"); JSONObject json = JSONObject.fromObject(map);
3. Bean转换成json代码 JSONObject jsonObject = JSONObject.fromObject(new JsonBean());
4. 数组转换成json代码 boolean[] boolArray = new boolean[] { true, false, true }; JSONArray jsonArray1 = JSONArray.fromObject(boolArray);
5. 一般数据转换成json代码 JSONArray jsonArray3 = JSONArray.fromObject("['json','is','easy']" );