Convert various types of data into JSON and fetch data from JSON in Java

First, import the following jar packages

Here are the various types of programs that convert to JSON and extract data from JSON

Package Jsontest;import Java.util.arraylist;import java.util.hashmap;import java.util.list;import java.util.Map; Import Net.sf.json.jsonarray;import Net.sf.json.jsonobject;public class Jsonmain {public static void main (string[] args ) {GetList (setlist ()); Getmap (Setmap ()); System.out.println ("Other similar---------------------"); System.out.println ("Convert object to JSON-------------------"); System.out.println (Setbean ()); System.out.println ("Convert array to JSON-------------------"); System.out.println (Setshuzu ()); System.out.println ("Convert object collection to JSON-----------------"); System.out.println (Setlistbeans ());} /** * Create a list array and convert it to JSON data * @return */public static String setlist () {list<string> list = new arraylist<string& gt; (); List.add ("one"), List.add ("one"), List.add ("three"); List.add ("four"); Jsonarray ja = jsonarray.fromobject (list); return ja.tostring ();}  /** * Create a map array and convert it to JSON data * @return */public static String setmap () {map<string,string> map =new hashmap<string, String> (); Map.put ("Name", "Xiaozhao"); map.Put ("Sex", "man"); Map.put ("Address", "China"); Jsonobject JB = jsonobject.fromobject (map); return jb.tostring ();} /** * Create an object and convert it to JSON data * @return */public static String Setbean () {UserBean UB = new UserBean (); Ub.setusername ("Zd"); ub.se Tpassword ("Zd"); ub.setage; ub.setaddress ("Henan"); Jsonobject JB = jsonobject.fromobject (UB); return jb.tostring ();} /** * Create an array and convert it to JSON data * @return */public static String Setshuzu () {Object [] Shuzu = {"One", 23,true, "four"}; Jsonarray JB = jsonarray.fromobject (Shuzu); return jb.tostring ();} /** * Create a list of objects and convert them to JSON data * @return */public static String Setlistbeans () {list<userbean> list = new Arraylist&lt ; Userbean> (); UserBean ub1 = new UserBean (), Ub1.setusername ("zz"), Ub1.setpassword ("zz"), ub1.setage (+); Ub1.setaddress ("Jinan"); UserBean ub2 = new UserBean () ub2.setusername ("DD"); Ub2.setpassword ("DD"); Ub2.setage ("ub2.setaddress"); List.add (UB1); List.add (UB2); Jsonarray ja2 = jsonarray.fromobject (list); return ja2.tostring ();} /** * Convert JSON data to LiSt * @param list */public static void GetList (String list) {System.out.println ("list converted to JSON data----------------------"); SYSTEM.OUT.PRINTLN (list); Jsonarray js = jsonarray.fromobject (list); System.out.println ("Convert JSON data to List---------------------"), for (int i =0; i<js.size (); i++) {System.out.println ( Js.get (i));}} /** * Remove data from map into JSON * @param map */public static void Getmap (String map) {System.out.println (" Map into JSON data-----------------------"); SYSTEM.OUT.PRINTLN (map); System.out.println ("Remove the data from the map into JSON---------------"); Jsonobject JB = jsonobject.fromobject (map); System.out.println (Jb.get ("Sex")); System.out.println (Jb.get ("Address")); System.out.println (Jb.get ("name"));}}

Where Userbean is an ordinary entity class

Here is the result of the run

Convert various types of data into JSON and fetch data from JSON in Java