java string parsing nested json

1. com.alibaba.fastjson

jar package address: https: //www.mvnjar.com/com.alibaba/fastjson/jar.html

The multilayer analytical

java resolves the following two strings json

Package jansonDemo; 

Import com.alibaba.fastjson.JSON;
 Import com.alibaba.fastjson.JSONArray;
 Import com.alibaba.fastjson.JSONObject; 

public  class TestJSON {
     / ** 
     * the JSON actually key-value pair ( "key": "value") 
     * Key must be a string, value may be valid JSON data type (string, number, object, array, Boolean, or null) 
     * If a string value, with jsonobj.getString ( "key") Get 
     * value for numbers, a method using jsonobj.getIntValue ( "key"), jsonobj.getFloatValue ( "key"), jsonobj.getInteger ( "key") and basic data types like packaging Get 
     * value if the Boolean value, with jsonobj.getBoolean ( "key"), jsonobj.getBooleanValue ( "key") acquisition 
     * value if it is an array, with jsonobj.getJSONArray ( "key") Gets 
     * value if the Object object is to obtain a jsonobj.get ( "key"),
     If the object is JSONObject * value, acquired by jsonobj.getJSONObject ( "key") 
     * / 

    / ** 
     * This method is used to convert the string to an existing json json object and remove the object corresponding to the corresponding key value value 
     * converted into a character string existing jsonobject, with JSON.parseObject (jsonStr) method 
     * is as long as JSON {} represents a JSONObject, [] represents the JSONArray a 
     * Gets an object with JSONObject JSONObject jsonobject.getJSONObject ( "key ") method 
     * Gets an object with JSONArray JSONObject jsonobject.getJSONArray (" key ") method 
     * / 

    Private  static  void strWritedToJSONObject () {
         // a nested json object following is a child object json 
        {\ n String myJsonObj =" " + 
                "\" name \ ": \" runoob \ ", \ the n-" + 
                "\" ALEXA \ ": 10000, \ the n-"+
                "    \"sites\": {\n" +
                "\" Site1 \ ": \" www.runoob.com \ ", \ the n-" + 
                "\" Site2 \ ": \" m.runoob.com \ ", \ the n-" + 
                "\" site3 \ ": \ "c.runoob.com \" \ n-"+ 
                "} \ n-"+ 
                "} " ; 
        JSONObject jsonobj = JSON.parseObject (myJsonObj); // convert the string into json jsonObject objects 
        / ** * Get each JSONObject a key value corresponding to the value when, according to what type of actual scene want to use less of each method ** * / 
        System.out.println (jsonobj.get ( "name")); // removed name corresponding to the value the value obtained is a Object 
        System.out.println (jsonobj.getString ( "name"));// remove the value corresponding to the value of the name, a String is obtained
        System.out.println (jsonobj.getIntValue ( "ALEXA")); // removed name value corresponding to the value obtained is a int 
        System.out.println (jsonobj.get ( "sites")); // remove sites value corresponding to a value obtained an Object 
        System.out.println (jsonobj.getString ( "sites" )); 
        System.out.println (jsonobj.getJSONObject ( ; "sites")) // value corresponding to the value taken sites to give a child object JSONObject 
        System.out.println (jsonobj.getJSONObject ( "sites") the getString ( "site2").); // remove JSONObject nested child object value corresponding to the value site2, must getJSONObject () first get JSONObject 


        / ** 
         * the following is a json object contains an array, the array also contains sub-objects and sub-json array 
         * / 
        String myJsonObj2 = "{\ n-" +
                "    \"name\":\"网站\",\n" +
                "    \"num\":3,\n" +
                "    \"sites\": [\n" +
                "        { \"name\":\"Google\", \"info\":[ \"Android\", \"Google 搜索\", \"Google 翻译\" ] },\n" +
                "        { \"name\":\"Runoob\", \"info\":[ \"菜鸟教程\", \"菜鸟工具\", \"菜鸟微信\" ] },\n" +
                "        { \"name\":\"Taobao\", \"info\":[ \"淘宝\", \"网购\" ] }\n" +
                "    ]\n" +
                "}";
        System.out.println (jsonobj2.getString ());
        System.out.println (jsonobj2.get ( "sites"convert the string into json jsonObject objects//= JSON.parseObject (myJsonObj2);
        Jsonobj2 the JSONObject//"sites"));
        System.out.println (jsonobj2.getJSONArray ());"sites" remove the value corresponding to the value of the sites, the object to obtain a JSONOArray
         // System.out.println (jsonobj2.getJSONObject ( "sites" )); this method can not be used, because the target sites is a JSONOArray
         // remove sites json object corresponding to a first value in the array json child objects 
        . System.out.println (jsonobj2.getJSONArray ( "sites" ) getJSONObject (0 )); // get the result: { "name": "Google ", "info": [ "Android", "Google Search", "Google Translate"]} 
        System.out.println (jsonobj2.getJSONArray ( "sites" ) .get (0 )); 
        System.out.println (jsonobj2.getJSONArray ( "sites") the getString (0. ));
        // remove json object info sites corresponding to the value corresponding to the array of nested child objects below the first sub array json 
        System.out.println (jsonobj2.getJSONArray ( "sites") .getJSONObject(0).getJSONArray("info")); //Results obtained: [ "Android", "Google Search", "Google Translate"]
         // remove the child object following the first json json object info sites in the corresponding array corresponding to the array of nested sub-second value 
        System.out .println (. jsonobj2.getJSONArray ( "sites") getJSONObject (0) .getJSONArray ( "info") the getString (. 1).); // get the results: Google Search 

        // sequentially json object takes a value corresponding to the array of sites 
        array = jsonobj2.getJSONArray the JSONArray ( "sites" ); 
        getJsonArrayItem (array); 
        // sequentially remove the corresponding sites json object json second sub-array corresponding to the info array values below the object nested sub 
        JSONArray arr = jsonobj2.getJSONArray ( "sites") getJSONObject (. 1) .getJSONArray ( "info." );
        getJsonArrayItem(arr);
     } 

    / ** 
     * Manually add objects to a the JSONObject 
     * / 
    Private  static  void writeStrToJSONObject() {
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("name","tom");
        jsonObject.put("age",20);

        JSONArray jsonArray = new JSONArray();
        JSONObject jsonArrayObject1 = new JSONObject();
        jsonArrayObject1.put("name","alibaba");
        jsonArrayObject1.put("info","www.alibaba.com");
        JSONObject jsonArrayObject2 = new JSONObject();
        jsonArrayObject2.put("name","baidu");
        jsonArrayObject2.put("info","www.baidu.com");

        jsonArray.add(jsonArrayObject1);
        jsonArray.add(jsonArrayObject2);

        jsonObject.put("sites",jsonArray);

        System.out.println(jsonObject);
     }

    /**
     * 将字符串转为JSONArray
     */
    private static void strToJsonArray() {
        String arrayStr = "[\n" +
                "        {\n" +
                "            \"name\":\"alibaba\",\n" +
                "            \"info\":\"www.alibaba.com\"\n" +
                "        },\n" +
                "        {\n" +
                "            \"name\":\"baidu\",\n" +
                "            \"info\":\"www.baidu.com\"\n" +
                "        }\n" +
                "    ]";

        JSONArray array = JSON.parseArray(arrayStr);
        System.out.println(array);

    (forgetJsonArrayItem (JSONArray Array) {
        voidstaticPrivate* /
     * values sequentially taken in JSONArray/ **
     }
     
      int i=0; i<array.size(); i++) {
            System.out.println(array.get(i));
        }
    }

     //测试类
    public static void main(String[] args) {
        strWritedToJSONObject();
        //writeStrToJSONObject();
        //strToJsonArray();
    }

}

Summary: If {} is used getJSONObject [] with getJSONArray

{}, For use in the loop through JSONArray:

 String s = "[{\"success\":true,\"data\":[{\"building_id\":\"***\",\"building_num\":\"**\",\"room_name\":\"**\",\"door_name\":\"**\",\"electric\":\"**\"}]}]";

 JSONArray ja = jsonx.getJSONArray("data");
        for (int i = 0; i < ja.size(); i++) {
            JSONObject jo = ja.getJSONObject(i);
            String building_id = jo.getString("building_id");
        }

3.JsonObject determines whether a string contains a json key value

public  static  void main (String [] args) throws JSONException { 

　　String jsonStr = "{ 'Content': [ '', '', '', ''], 'Baseline': { 'Content': [ '. 1', '2'], 'BaselineName': 'JC', 'BaselineId': '813xxx'}} " ; 

　　JSONObject jsonObject = new new JSONObject (jsonStr); 

　　// call has JSONObject methods herein to determine whether there is a key value, if returns presence to true 

　　IF (jsonObject .has ( "Baseline" )) { 

　　　　// here after the key operation corresponding to the current value of the presence of 

　　　　the jSONObject jsonObject2 = (the jSONObject) jsonObject.get ( "Baseline" ); 

　　　　...... 

　　　　... ...

　　}

}

How 4.fastjson judge JSONObject and JSONArray

 /**
     * 单层的orgJson判断是否是JSONObject还是JSONArray.
     */
    public static void simpleJSONObjectOrgJson() {
        String message = "[{\r\n" + "        \"DataSource\": \"'P33'\",\r\n"
                + "        \"DataStamp\": \"'2018-08-25'\",\r\n" + "        \"GovScCode\": \"'aaa'\",\r\n"
                + "        \"OperEffDate\": \"'2018-05-02'\",\r\n" + "        \"OrgCode\": \"'ww'\",\r\n"
                + "        \"OrgDesc\": \"'ss'\",\r\n" + "        \"OrgId\": \"1\",\r\n"
                + "        \"OrgName\": \"'11111'\",\r\n" + "        \"OrgSeq\": \"11\",\r\n"
                + "        \"OrgShortName\": \"'ss'\",\r\n" + "        \"OrgStatus\": \"'ss'\",\r\n"
                + "        \"OrgType\": \"'ss'\",\r\n" + "        \"ParentOrgId\": \"0\",\r\n"
                + "        \"RegAddress\": \"'ww'\",\r\n" + "        \"RegDate\": \"\",\r\n" + "        \"RegionId\": \"1\"\r\n"
                + "    }]";
        Object json = new JSONTokener(message).nextValue();
        if (json instanceof JSONObject) {
            JSONObject jsonObject = (JSONObject) json;
            System.out.println(jsonObject);
            the JSONArray) {the instanceof(JSONIFthe else
        }Analytical itself to// 
            JSONArray the JSONArray = (the JSONArray) JSON; 
            System.out.println (JSONArray); 
            // parsing can be self 
        } 
    }

 These are the problems encountered by the project, thanks to the big brother to share:

https://www.cnblogs.com/janson071/p/9646678.html

https://blog.csdn.net/kxj19980524/article/details/83718971

https://www.cnblogs.com/1012hq/p/11141932.html

https://www.cnblogs.com/biehongli/p/9721846.html