The use of Jsonobject and Jsonarray

Java, unlike PHP parsing and production JSON, is always a painful process. But using Jsonobject and Jsonarray will make the whole process relatively comfortable.

Packages to rely on: Commons-lang.jar commons-beanutils.jar commons-collections.jar Commons-logging.jar Ezmorph.jar Json-lib-2.2.2-jdk15.jar

1. Create a Jsonobject object:

Package Com.yunos.tv.video.resource.controller.web;import Java.util.arraylist;import Java.util.HashMap;import        Net.sf.json.jsonarray;import Net.sf.json.jsonobject;public class Test {public static void main (string[] args) { Jsonobject and Jsonarray The difference is Jsonobject is the object form, Jsonarray is the array form//Create Jsonobject The first method jsonobject Jsonobject = new JS        Onobject ();        Jsonobject.put ("UserName", "Zhuli");        Jsonobject.put ("Age", "30");        Jsonobject.put ("Workin", "ALI");                System.out.println ("JsonObject1:" + jsonobject);        Create Jsonobject The second method hashmap<string, string> HashMap = new hashmap<string, string> ();        Hashmap.put ("UserName", "Zhuli");        Hashmap.put ("Age", "30");        Hashmap.put ("Workin", "ALI");                System.out.println ("JsonObject2:" + jsonobject.fromobject (HASHMAP));        Create a Jsonarray Method 1 Jsonarray jsonarray = new Jsonarray ();        Jsonarray.add (0, "Zhuli");        Jsonarray.add (1, "30");Jsonarray.add (2, "ALI");                System.out.println ("JsonArray1:" + Jsonarray);        Create Jsonarray Method 2 arraylist<string> ArrayList = new arraylist<string> ();        Arraylist.add ("Zhuli");        Arraylist.add ("30");        Arraylist.add ("ALI");                System.out.println ("JsonArray2:" + jsonarray.fromobject (arrayList)); If Jsonarray parses a HASHMAP, the entire object is placed in the value of an array System.out.println ("Jsonarray from HASHMAP:" + jsonarray.fromobject (hash                MAP));        Assemble a complex jsonarray jsonobject jsonObject2 = new Jsonobject ();        Jsonobject2.put ("UserName", "Zhuli");        Jsonobject2.put ("Age", "30");        Jsonobject2.put ("Workin", "ALI");        Jsonobject2.element ("Array", arrayList);                    System.out.println ("JsonObject2:" + jsonObject2); }}

Results:

jsonobject1:{"UserName": "Zhuli", "Age": "A", "Workin": "Ali"}jsonobject2:{"Workin": "Ali", "Age": "A", "UserName": " Zhuli "}jsonarray1:[" Zhuli "," "," Ali "]jsonarray2:[" Zhuli "," a "," Ali "]jsonarray from hashmap:[{" Workin ":" Ali "," Age ":", "UserName": "Zhuli"}]jsonobject2:{"UserName": "Zhuli", "Age": "30", "Workin": "ALI", "Array": ["Zhuli", "", "ALI"]}

Parse JSON string:

Package Com.yunos.tv.video.resource.controller.web;import Net.sf.json.jsonarray;import Net.sf.json.JSONObject; public class Test {public    static void Main (string[] args) {        String jsonstring = "{\" username\ ": \" zhuli\ ", \" Age\ " : \ "30\", \ "workin\": \ "ali\", \ "array\": [\ "Zhuli\", \ "30\", \ "Ali\"]} ";        Convert the JSON string to a Java object        jsonobject obj = Jsonobject.fromobject (jsonstring);        Get UserName        if (Obj.has ("UserName")) {            System.out.println ("UserName:" + obj.getstring ("UserName") in Object );        }        Get Arrayobject        if (Obj.has ("array")) {            Jsonarray Transitlistarray = Obj.getjsonarray ("array");            for (int i = 0; i < transitlistarray.size (); i++) {                System.out.print ("Array:" + transitlistarray.getstring (i) + " ");            }        }    }}

Return:

username:zhuliarray:zhuli array:30 Array:ali