fastjson--Ali Open Source's fastest JSON and object conversion tool

Example

Importjava.util.ArrayList;Importjava.util.List;ImportJava.util.HashMap;ImportJava.util.Map;ImportCom.alibaba.fastjson.JSON;ImportCom.alibaba.fastjson.JSONArray;ImportCom.alibaba.fastjson.JSONObject;classuser{Private intID; PrivateString name;  Public intgetId () {returnID; }     Public voidSetId (intID) { This. ID =ID; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }}classgroup{Private intID; PrivateString name; Privatelist<user> list =NewArraylist<user>();  Public intgetId () {returnID; }     Public voidSetId (intID) { This. ID =ID; }     PublicString GetName () {returnname; }     Public voidsetName (String name) { This. Name =name; }     PublicList<user>getList () {returnlist; }     Public voidSetlist (list<user>list) {         This. List =list; }}classWeibo {PrivateString ID; PrivateString City;  PublicWeibo (string ID, String city) { This. ID =ID;  This. City =City ; }     PublicWeibo () {} PublicString getId () {returnID; }     Public voidsetId (String id) { This. ID =ID; }     PublicString getcity () {returnCity ; }     Public voidsetcity (String city) { This. City =City ; }} Public classJsondemo { Public Static voidMain (string[] args) {json2jsonobjectm1 ();//converts JSON text data information to a Jsonobject object and then obtains information using key-value pairsJSON2BEANM2 ();//convert JSON text data to JavaBean data! JSON2JSONARRAYM3 ();//Convert JSON data to Jsonarray:JSON2JAVABEANM4 ();//Converts JSON text to a collection of JavaBean, converted to a simple 1 object:parseobject (String text, class<t> clazz);BEAN2JSONM5 ();//convert JavaBean to JSON-formatted data/json the delivery of text user data: For example, uploading a serverBEAN2JSONOBJECTM6 ();//convert JavaBean to JSON objectComplexExampleM7 ();//a relatively complex example:COMPLEX2JSONM8 ();//a complex object-to-JSON demoCOMPLEXMAP2JSONM9 ();//convert the map data to jsonstring demo; This is not a direct break for the Redboy server!     }    /*** Convert JSON text data information to a Jsonobject object and then obtain information using key-value pairs*/    Private Static voidjson2jsonobjectm1 () {//a jsonobject text dataString s = "{\" name\ ": \" liuzhao\ "}"; //convert Jsonobject data to JSONJsonobject Object =Json.parseobject (s); //get a value by using key-value pairsSystem.out.println (Object.get ("name")); /*** Print: * Liuzhao*/    }    /*** Convert JSON text data to JavaBean data! * Note: The name of the key in the JSON text message must be the same as the field name in JavaBean!     The keys do not appear in this javabean as null! */    Private Static voidjson2beanm2 () {String s= "{\" id\ ": \" 0375\ ", \" city\ ": \" Mesa \ "}"; //a simple and convenient way to convert JSON text information to jsonobject objects while converting to JavaBean objects! Weibo Weibo = Json.parseobject (S, Weibo.class);//the Weibo class is defined belowSystem.out.println (Weibo.getid ());        System.out.println (Weibo.getcity ()); //Printed Results 0375//Pingdingshan    }    /*** Convert data of map type to jsonstring*/    Private Static voidComplexmap2jsonm9 () {Group Group=NewGroup (); Group.setid (1); Group.setname ("Group"); User User1=NewUser (); User1.setid (2); User1.setname ("User1"); User User2=NewUser (); User2.setid (3); User2.setname ("User2");        Group.getlist (). Add (User1);        Group.getlist (). Add (User2); Map<integer, object> map =NewHashmap<integer,object>(); Map.put (1, "the most"); Map.put (2, "No.2"); Map.put (3, Group.getlist ()); String jsonstring=json.tojsonstring (map);        System.out.println (jsonstring); /*** Output: {1: "The Most", 2: "No.2", 3:[{"id": 2, "name": "user1"},{"id": 3, "name": "User2"}]}*/    }    /*** from a complex object to JSON demo*/    Private Static voidCOMPLEX2JSONM8 () {Group Group=NewGroup (); Group.setid (1); Group.setname ("Group"); User User1=NewUser (); User1.setid (2); User1.setname ("User1"); User User2=NewUser (); User2.setid (3); User2.setname ("User2");        Group.getlist (). Add (User1);        Group.getlist (). Add (User2); String jsonstring=json.tojsonstring (group);        System.out.println (jsonstring); /*** Output: {"id": 1, "list": [{"id": 2, "name": "user1"},{"id": 3, "name": "User2"}], "name": "Group"}*/    }    /*** A relatively complex example: * JSON text data: * First is jsonobject, converted to Jsonarray; * then convert Jsonarray to JavaBean*/    Private Static voidcomplexExampleM7 () {String s= "{js:[{id:\" 110000\ ", \" city\ ": \" North #001 Beijing \ "},{id:\" 110000\ ", \" city\ ": \" North #002 beijing \ "}" + ", {id:\" 110000\ ", \" CIT                Y\ ": \" North #002 Beijing \ "},{id:\" 110000\ ", \" city\ ": \" North #002 Beijing city \ "}," + "{id:\" 110000\ ", \" city\ ": \" #006北 #005 beijing \ "}," + "{id:\" 110000\ ", \" city\ ": \" North #002 beijing \ "}," + "{id:\" 110000\ ", \" city\ ": \" North #002 Beijing \ "},{id:\" 120000\ ", \ "city\": \ "Day #009 Jinshi \"}]} "; Jsonobject Object=Json.parseobject (s); Object Jsonarray= Object.get ("JS");        System.out.println (Jsonarray); List<Weibo> list = Json.parsearray (jsonarray+ "", Weibo.class);  for(Weibo weibo:list) {System.out.println (weibo.getcity ()); }    }    /*** Convert JavaBean to JSON object*/    Private Static voidbean2jsonobjectm6 () {Weibo Weibo=NewWeibo ("0373", "Luoyang"); Jsonobject JSON=(Jsonobject) Json.tojson (Weibo); System.out.println (Json.get ("id")); /*** Print: * 0373*/    }    /*** Convert JSON text to JavaBean collection; * Internal implementations must be converted to Jsonarray first and then to the list collection*/    Private Static voidjson2javabeanm4 () {String s= "[{\" id\ ": \" 0375\ ", \" city\ ": \" Mesa \ "},{\" id\ ": \" 0377\ ", \" city\ ": \" Nanyang \ "}]"; List<Weibo> list = Json.parsearray (S, Weibo.class);  for(Weibo weibo:list) {System.out.println (weibo.getcity ()); }        /*** Print: * Pingdingshan * Nanyang*/    }    /*** Convert JSON data to Jsonarray: * Note: After getting to Jsonarray (we just get to Jsonarray instead of the list collection of JavaBean) * Get the data in Jsonarray convert to Stri     The NG type needs to be added "" outside; */    Private Static voidjson2jsonarraym3 () {String s= "[{\" id\ ": \" 0375\ ", \" city\ ": \" Mesa \ "},{\" id\ ": \" 0377\ ", \" city\ ": \" Nanyang \ "}]"; //convert JSON text to JsonarrayJsonarray array =Json.parsearray (s); //This line must be written: must be added + "", otherwise the type of strong turn exception will be reported! String str = array.get (1) + ""; System.out.println (Array.get (0)); Jsonobject Object=json.parseobject (str); System.out.println (Object.get ("id")); /*** {"City": "Mesa", "id": "0375"} 0377*/    }    /*** Convert JavaBean to JSON-formatted data/json text * User data transfer: For example, uploading a server*/    Private Static voidbean2jsonm5 () {Weibo Weibo=NewWeibo ("123456", "Shanghai"); String String=json.tojsonstring (Weibo);        System.out.println (string); /*** Print: * {"City": "Shanghai", "id": "123456"}*/    }}

Reference

http://www.oschina.net/code/snippet_228315_35122

fastjson--Ali Open Source's fastest JSON and object conversion tool