[工具类] 读取解析json文件

    /**

     * 通过本地文件访问json并读取

     *

     * @param path：json文件路径

     * @return：json文件的内容

     */

    public static String ReadFile(String path) {

        StringBuffer laststr = new StringBuffer();

        File file = new File(path);// 打开文件

        BufferedReader reader = null;

        try {

            FileInputStream in = new FileInputStream(file);

            reader = new BufferedReader(new InputStreamReader(in, "UTF-8"));// 读取文件

            String tempString = null;

            while ((tempString = reader.readLine()) != null) {

                laststr = laststr.append(tempString);

            }

            reader.close();

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            if (reader != null) {

                try {

                    reader.close();

                } catch (IOException el) {

                }

            }

        }

        return laststr.toString();

    }

public static void main(String args[]) {

        String filePath = "D:/data.json";

        String jsonString = ReadFile(filePath);

        JSONArray jsonArr = JSON.parseArray(jsonString);

        Map<String, Object> resultMap = new HashMap<String, Object>();

        for (int i = 0; i < jsonArr.size(); i++) {

            Map data_map = (Map) jsonArr.get(i);//本次循环获取数据

            Integer customer_id = (Integer) data_map.get("customer_id");

            String customer_email = (String) data_map.get("customer_email");

            String customer_firstname = (String) data_map.get("customer_firstname");

            String customer_lastname = (String) data_map.get("customer_lastname");

            String sku = (String) data_map.get("sku");

            String created_at = (String) data_map.get("created_at");

            Map level_1_map = (Map) resultMap.get(customer_id.toString());

            if (null == level_1_map || level_1_map.size() <= 0) {

                level_1_map = new HashMap<String, Object>();

                level_1_map.put("customer_id", customer_id);

                level_1_map.put("customer_email", customer_email);

                level_1_map.put("customer_firstname", customer_firstname);

                level_1_map.put("customer_lastname", customer_lastname);

            }

            List list = level_1_map.get("list") == null ? new ArrayList<T>() : (List) level_1_map.get("list");

            Map listMap = new HashMap<String, Object>();

            listMap.put("sku", sku);

            listMap.put("created_at", created_at);

            list.add(listMap);

            level_1_map.put("list", list);

            resultMap.put(customer_id.toString(), level_1_map);

        }

        System.out.println(JSON.toJSONString(resultMap));

    }