Json文件解析

代码功能：对kafka等工具输出的json流文件进行解析

实现工具：jsonpath     jackjson    fastjson

代码实现：

// 用jsonpath实现如下：

public class JsonParser extends Parser {
   @Override
   public Map<String, String> parse(String inputStr) throws ParserException {

      return null;
   }

   public static void main(String[] args) {

      String inputStr = "{  \n" + "        \"国家\": {  \n" + "            \"中国\": {  \n" + "                \"省份\":  \n" + "                    {  \n" + "                        \"名称\": \"浙江\",  \n" + "                        \"城市\": [  \n" + "                            \"杭州\",  \n" + "                            \"宁波\"  \n" + "                        ]  \n" + "                    },  \n" + "               \n" + "        }  \n" + "    }\n" + "}\t";
      try {
         JSONObject jsonObject = new JSONObject(inputStr);

         Iterator iterator = jsonObject.keys();
         while (iterator.hasNext()) {
            String key = (String) iterator.next();
            String value = jsonObject.getString(key);
            System.out.println(key + "--" + value);
         }
      } catch (Exception e) {
         e.printStackTrace();
      }
   }
实现结果：
国家--{"中国":{"省份":{"名称":"浙江","城市":["杭州","宁波"]}}}
===============================================================================================================================
//用jackjson实现如下：

public class JsonParserJackJson extends Parser {

   @Override
   public Map<String, String> parse(String inputStr) throws ParserException {
      return null;
   }

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

   @JsonAnySetter
   public void set(String key, Object value) {
      other.put(key, value);
      System.out.println("目前的K值：" + key);
      System.out.println("解析的json文件：" + other);

      Set<String> keySet = other.keySet();
      for (String keys : keySet) {
         HashMap<String, String> keyValue = (HashMap<String, String>) other.get(keys);
         Set<String> keySet2 = keyValue.keySet();
         for (String key2 : keySet2) {
            System.out.println("目前的K值：" + key2);
            System.out.println("K值集合：" + keys + "-" + key2 );
         }
      }
   }


   public static InputStream getStringStream(String inputStr) {
      if (inputStr != null && !inputStr.trim().equals("")) {
         try {
            ByteArrayInputStream inputStringStream = new ByteArrayInputStream(inputStr.getBytes());
            return inputStringStream;
         } catch (Exception ex) {
            ex.printStackTrace();
         }
      }
      return null;
   }

   public static void main(String[] args) {
      String inputStr = "{  \n" + "        \"国家\": {  \n" + "            \"中国\": {  \n" + "                \"省份\":  \n" + "                    {  \n" + "                        \"名称\": \"浙江\",  \n" + "                        \"城市\": [  \n" + "                            \"杭州\",  \n" + "                            \"宁波\"  \n" + "                        ]  \n" + "                    } \n" + "               \n" + "        }  \n" + "    }\n" + "}\t";
      ObjectMapper mapper = new ObjectMapper();
      mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
      try {
         mapper.readValue(getStringStream(inputStr), JsonParserJackJson.class);
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
}
实现结果：
目前的K值：国家
解析的json文件：{国家={中国={省份={名称=浙江, 城市=[杭州, 宁波]}}}}
目前的K值：中国
K值集合：国家-中国
===================================================================================================
//用fastjson实现如下：
public class JsonParseFastJson {

   public static void main(String[] args) {
      String jsonStr = "{  \n" + "        \"国家\": {  \n" + "            \"中国\": {  \n" + "                \"省份\":  \n" + "                    {  \n" + "                        \"名称\": \"浙江\",  \n" + "                        \"城市\": [  \n" + "                            \"杭州\",  \n" + "                            \"宁波\"  \n" + "                        ]  \n" + "                    },  \n" + "               \n" + "        }  \n" + "    }\n" + "}\t";
      System.out.println("无序遍历结果：");
      JSONObject jsonObj = JSON.parseObject(jsonStr);
      for (Map.Entry<String, Object> entry : jsonObj.entrySet()) {//一个entry代表一个属性，key是属性名，value是属性值
         System.out.println(entry.getKey() + ":" + entry.getValue());
      }

      System.out.println("有序遍历结果：");
      LinkedHashMap<String, String> jsonMap = JSON.parseObject(jsonStr, new TypeReference<LinkedHashMap<String, String>>() {
      });
      for (Map.Entry<String, String> entry : jsonMap.entrySet()) {
         System.out.println(entry.getKey() + ":" + entry.getValue());
      }
   }
}

实现结果：
无序遍历结果：
国家:{"中国":{"省份":{"名称":"浙江","城市":["杭州","宁波"]}}}
有序遍历结果：
国家:{"中国":{"省份":{"名称":"浙江","城市":["杭州","宁波"]}}}