fastjson

 1.String json串转实体

       String str = "{\"applyBatchNum\":\"xxxxxx-0001\"}";

      JSONObject response = JSONObject.parseObject(str);

     JSON.toJavaObject(response,JavaBean.class);

2.JsonArray转实体

   List<ResQueryInvoiceDTO> resQueryInvoiceDTOS = Lists.newArrayList();

  resQueryInvoiceDTOS = JSONArray.parseArray(map.get("datas"), ResQueryInvoiceDTO.class);

3.String转map

   String conResult = result.get(IabConstant.COLB);

   Map<String,String> map = JSON.parseObject(conResult,Map.class);

/**
 * map转jsonObject
 */ 
public static JSONObject mapToJson(Map<String, Object> map) {
        String data = JSON.toJSONString(map);
        return JSON.parseObject(data);
    }
    /**
     * map中取key对应的value
     * @param map
     * @param key
     * @return
     */
    public String mapToString(Map<String, Object> map, String key) {
        JSONObject jsonObject = mapToJson(map);
        return jsonObject.getString(key);
    }
    /**
     * map中取类对象
     * @param map
     * @param clazz
     * @param key
     * @param <T>
     * @return
     */
    public static <T> T mapToObject(Map<String, Object> map, Class<T> clazz, String key) {
        T t = null;
        JSONObject jsonObject = mapToJson(map);
        if (StringUtils.isNotEmpty(key)) {
            JSONObject object = jsonObject.getJSONObject(key);
            t = object.toJavaObject(clazz);
        } else {
            t = jsonObject.toJavaObject(clazz);
        }
        return t;
    }
    /**
     * map中取list
     * @param map
     * @param clazz
     * @param key
     * @return
     */
    public List<T> mapToList(Map<String, Object> map, Class<T> clazz, String key) {
        List<T> t = null;
        JSONObject jsonObject = mapToJson(map);
        JSONArray array = jsonObject.getJSONArray(key);
        t = array.toJavaList(clazz);
        return t;
    }

    public static <T> T mapToBean(Map<String, Object> map,Class<T> clazz)  {
        T bean = null;
        try {
            bean = clazz.newInstance();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        }
        BeanMap beanMap = BeanMap.create(bean);
        beanMap.putAll(map);
        return bean;
    }