JSON 的应用

使用  JSON 需要的 jar 包：

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建议：

日期 直接转 json 会报错，一般把日期转换成字符串 再转json  ，取的时候取的是字符串，再根据格式转换为 date 类型

一.json List 互转：

1.List 转 Json

ArrayList<ScheduleModel> al=new ArrayList<ScheduleModel>();
JSONArray jsonArray = JSONArray.fromObject(al);
String jsonJAVA = jsonArray.toString();
//以字符流的方式，将json字符串输出到客户端
response.setContentType("text/html;charset=UTF-8");
PrintWriter pw = response.getWriter();
pw.write(jsonJAVA);
pw.flush();
pw.close();

2.Json 格式字符串 转 List

 JSONArray data = JSONArray.fromObject(str);
         ArrayList<ScheduleModel> scheduleList = new ArrayList<ScheduleModel>();
         for(int i=0;i<data.size();i++){
             //封装 bean
             JSONObject jobj =  (JSONObject) data.get(i);
             ScheduleModel bean = new ScheduleModel();
             bean.setScheduleId(Integer.parseInt(jobj.get("scheduleId").toString()));
             bean.setHspId(jobj.get("hspId").toString());
             bean.setHspName(jobj.get("hspName").toString());
             bean.setInnerOfficeId(jobj.get("innerOfficeId").toString());
             bean.setInnerOfficeName(jobj.get("innerOfficeName").toString());
             bean.setDocId(jobj.get("docId").toString());
             bean.setDocName(jobj.get("docName").toString());
             bean.setDocGra(jobj.get("docGra").toString());
             bean.setNoonCode(jobj.get("noonCode").toString());
             bean.setResidueNum(Integer.parseInt(jobj.get("residueNum").toString()));
             //日期转换
             String strDate = jobj.get("visitDate").toString();
             SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
             Date date = sdf.parse(strDate);
             bean.setVisitDate(date);
             scheduleList.add(bean);
        }

二. map json 互转

1.map 转 Json ,分页显示的时候可能用到

//调用业务层
                DoctorService docService= factory.DaoFactory.getDoctorServiceInstanse();
                Page page = docService.show(currPageNO);

                //创建Map集合
                Map<String,Object> map = new LinkedHashMap<String,Object>();
                map.put("total",page.getAllRecordNO());
                map.put("rows",page.getDocList());

                //使用第三方工具将map转成json文本
                JSONArray jsonArray = JSONArray.fromObject(map);
                String jsonJAVA = jsonArray.toString();

                //去掉二边的空格
                jsonJAVA = jsonJAVA.substring(1,jsonJAVA.length()-1);
                System.out.println("jsonJAVA=" + jsonJAVA);

                //以字符流的方式，将json字符串输出到客户端
                response.setContentType("text/html;charset=UTF-8");
                PrintWriter pw = response.getWriter();
                pw.write(jsonJAVA);
                pw.flush();
                pw.close();