Google Gson Use Summary

Recently began to contact the use of Google Gson Library, personally feel that it is very useful, here a brief introduction to the development of Gson common functions.

1.Serialize JSON

Package Com.ricky.java.gson;
Import java.util.ArrayList;
Import java.util.List;
Import Com.google.gson.Gson;
Import Com.google.gson.GsonBuilder;

Import Com.ricky.java.gson.bean.User; /** * Serialize and Deserialize JSON Data in Java * @author Ricky * */public class Gsonserilize {public STA
		
		tic void Main (string[] args) {serializeobject ();
	Serializelist ();
		public static void SerializeObject () {User user = new user ();
User.setid (1001);
		User.setname ("Ricky");
		
		User.setage (25);
		
		Gson Gson = new Gsonbuilder (). setprettyprinting (). Serializenulls (). Create ();
	System.out.println (Gson.tojson (user));
		
		public static void Serializelist () {list<user> List = new arraylist<user> ();
		User user = new user ();
		User.setid (1001);
		User.setname ("Ricky");
		
		User.setage (25);
		
		List.add (user);
		User User2 = new user ();
		User2.setid (1002);
		User2.setname ("Tim");
		
		User2.setage (24);
		
		List.add (User2); Gson Gson = new Gsonbuilder (). setprettyprinting (). Serializenulls (). Create ();
	System.out.println (Gson.tojson (list));
 }
}

Here the main use of Gson.tojson (Object src)

You can easily serialize Java objects, such as beans, lists, map objects, and so on.

2.Deserialize JSON

Package Com.ricky.java.gson;
Import Java.lang.reflect.Type;
Import java.util.ArrayList;

Import java.util.List;
Import Com.google.gson.Gson;
Import Com.google.gson.GsonBuilder;
Import Com.google.gson.reflect.TypeToken;

Import Com.ricky.java.gson.bean.User; /** * Serialize and Deserialize JSON Data in Java * @author Ricky * */public class Gsondeserilize {public S
		
		tatic void Main (string[] args) {deserializeobject ();
	Deserializelist ();
		
		public static void Deserializeobject () {String json = "{\ id\": 10010,\ "name\": \ "Ricky feng\", \ "age\": 25} ";
		
		Gson Gson = new Gsonbuilder (). setprettyprinting (). Serializenulls (). Create ();
		User user = Gson.fromjson (JSON, user.class);
	SYSTEM.OUT.PRINTLN (user); public static void Deserializelist () {String json = ' [{\ id\ ': 10010,\ ' name\ ': \ ' Ricky feng\ ', \ ' age\ ': 25},{\ ' id\ ':
		
		10011,\ "name\": \ "mike\", \ "age\": 24}] ";
		
		Gson Gson = new Gsonbuilder (). setprettyprinting (). Serializenulls (). Create (); Type ListType = new Typetoken<arraylist<user>> () {}.gettype ();
		list<user> list = Gson.fromjson (JSON, ListType);
	SYSTEM.OUT.PRINTLN (list);
 }
}

This is mainly used for Gson.fromjson (String json, class< user> Classoft)

It is very convenient to deserialize the JSON string into a Java object.

3.Parse JSON

Package Com.ricky.java.gson;
Import Com.google.gson.Gson;
Import Com.google.gson.GsonBuilder;
Import com.google.gson.JsonElement;
Import Com.google.gson.JsonObject;

Import Com.google.gson.JsonParser; /** * How to Parse JSON Data into Java with Gson * @author Ricky * */public class Gsontest {public static void main (
		
		String[] args {String json = "{\ Success\": true,\ "message\": \ "Invalid access Token.\"} ";
		1.jsonparser.parse (String JSON);
		Jsonparser jsonparser = new Jsonparser ();
		Jsonobject Jo = (jsonobject) jsonparser.parse (JSON);
		Boolean success = Jo.get ("Success"). Getasboolean ();
		
		SYSTEM.OUT.PRINTLN (Success);
		String msg = jo.get ("message"). Getasstring ();
		
		System.out.println ("msg=" +msg);
		
		System.out.println ("------------------");
		2.gson.fromjson (String json, class<jsonelement> Classoft);
		Gson Gson = new Gsonbuilder (). setprettyprinting (). Serializenulls (). Create ();
		Jsonelement Jelem = Gson.fromjson (JSON, jsonelement.class); Jsonobject Jobj = Jelem.getasjsonobject ();
		
		Jelem.getasjsonarray ();
		msg = Jobj.get ("message"). Getasstring ();
		
		System.out.println ("msg=" +msg);
		Boolean has = Jobj.has ("Status");
	System.out.println ("has=" +has);
 }

}

There are so many Gson APIs that you are currently exposed to, and more in-depth understanding of Gson will continue to be updated.