fastJson

1、String转换为JSONObject

String param = "{\"age\":\"24\",\"name\":\"cool_summer_moon\"}";
JSONObject  jsonObject = JSONObject.parseObject(param);
Object object = jsonObject.get("name");

2、JSONObject转换为String

String jsonString = jsonObject.toJSONString();

3、JsonString转换为Object

 String jsonString = jsonObject.toJSONString();
 Info info = JSON.parseObject(jsonString, Info.class);

 4、String 转 Map

String str = "{\"age\":\"24\",\"name\":\"cool_summer_moon\"}";
JSONObject  jsonObject = JSONObject.parseObject(str);
//json对象转Map

Map<String,Object> map = (Map<String,Object>)jsonObject;
Object object = map.get("age");

5、Map转String

Map<String,Object> map = new HashMap<>();
map.put("age", 24);
map.put("name", "cool_summer_moon");
String jsonString = JSON.toJSONString(map);
System.out.println("json字符串是："+jsonString);


运行结果:
json字符串是：{"name":"cool_summer_moon","age":24}

6、Map转换为Json

Map<String,Object> map = new HashMap<>();
map.put("age", 24);
map.put("name", "cool_summer_moon");
JSONObject json = new JSONObject(map);
System.out.println("Json对象是：" + json);


运行结果：
Json对象是：{"name":"cool_summer_moon","age":24}

7、获取JSONObject中的JSONObject

String str = "{\"age\":\"24\",\"info\":{\"name\":\"cool_summer_moon\",\"time\":\"201902131331\"}}";
JSONObject  jsonObject = JSONObject.parseObject(str);
JSONObject info = jsonObject.getJSONObject("info");
info.get("name").toString();
System.out.println("data==>"+info.toString());
System.out.println("name==>"+ info.get("name").toString());

返回值：
data==>{"name":"cool_summer_moon","time":"201902131331"}
name==>cool_summer_moon

gson：

1、string转换为object

Gson gson = new Gson();
String deployJson = pDeploy.getDeploymentJson();
Deployment deployment = gson.fromJson(deployJson,Deployment.class);

2、object转换为String

Deployment deployment = new Deployment();
Gson gson  = new Gson();
pDeployment.setDeploymentJson(gson.toJson(deployment));

3、map转换为json

Gson gson = new Gson();
Map map = Maps.newHashMap();  
map.put("colour", "red");  
map.put("weight", "10kg");  
gson.toJson(map);  

4、json转换为map

Gson gson = new Gson();  
Map map = Maps.newHashMap();  
map.put("colour", "red");  
map.put("weight", "10kg");  
String mapJson =  gson.toJson(map);  
map = gson.fromJson(mapJson,Map.class);  

jackson

ObjectMapper om = new ObjectMapper();
List<Map<String,Object>> list =  om.readValue(temp, new TypeReference<List<Map<String, Object>>>() {});

 /**
     * description 生成参数
     * @param orderBean
     * @return
     */
    public JSONObject getOrderBody(OrderBean orderBean){
        DateTimeFormatter df = DateTimeFormatter.ofPattern("yyyyMMddHHmmss");
        String timestamp = df.format(LocalDateTime.now()) + "";
        TreeMap<String, Object> params = new TreeMap<String, Object>();
        params.put("appId", orderBean.getAppId());
        params.put("timestamp", timestamp);
        params.put("version", orderBean.getVersion());
        params.put("serviceCode", orderBean.getServiceCode());
        params.put("phoneId", orderBean.getPhoneId());
        params.put("orderType", orderBean.getOrderType());
        params.put("activityId", orderBean.getActivityId());
        params.put("skuId", orderBean.getSkuId());
        orderBean.setCustomerOrderId(timestamp+orderBean.getPhoneId());
        params.put("customerOrderId", orderBean.getCustomerOrderId());
        params.put("effectType", orderBean.getEffectType());
        params.put("orderCount", orderBean.getOrderCount());
        params.put("notifyUrl", orderBean.getNotifyUrl());
        JSONObject attach = new JSONObject();
        attach.put("destinationIp", orderBean.getDestinationIP());
        attach.put("userIp", orderBean.getPrivateIP());
        attach.put("token", orderBean.getQosToken());
        params.put("attach", attach.toString());
        String sign = "";
        try {
            sign = HmacUtil.signTopRequest(params, APP_KEY);
        } catch (IOException e) {
            e.printStackTrace();
        }
        JSONObject header = new JSONObject();
        header.put("appId", orderBean.getAppId());
        header.put("serviceCode", orderBean.getServiceCode());
        header.put("timestamp", timestamp);
        header.put("version", orderBean.getVersion());
        header.put("sign", sign);
        JSONObject parameter = new JSONObject();
        parameter.put("customerOrderId", orderBean.getCustomerOrderId());
        parameter.put("phoneId", orderBean.getPhoneId());
        parameter.put("notifyUrl", orderBean.getNotifyUrl());
        parameter.put("orderType", orderBean.getOrderType());
        parameter.put("skuId", orderBean.getSkuId());
        parameter.put("activityId", orderBean.getActivityId());
        parameter.put("effectType", orderBean.getEffectType());
        parameter.put("orderCount", orderBean.getOrderCount());
        parameter.put("attach", attach.toString());
        JSONObject reqParam = new JSONObject();
        reqParam.put("header", header.toString());
        reqParam.put("params", parameter.toString());
        return  reqParam;
    }

JSONObject reqParam = accessUtil.getOrderBody(orderBean);
// 返回值
 String resp = RequestUtil.httpReqForJsonWithPostMethod(AccessConstants.endpoint, reqParam.toString());
 JSONObject respObject = JSONObject.fromObject(resp);

if(respObject.containsKey("resCode") && respObject.containsKey("resDesc")){
   map.put("resCode",respObject.getString("resCode"));
   map.put("resDesc",respObject.getString("resDesc"));
}else {
   map.putAll(ResultStatesEnum.ORDER_FAILURE.toMap());  
}