Java uses Json-lib to manipulate JSON

1.1. Download Json-lib.jar

http://sourceforge.net/projects/json-lib/files/json-lib/

1.2. Java objects are converted to json1.2.1. The map object is converted to JSON

Map2json.java

Package json; import Java.util.HashMap; import Java.util.Map; import Net.sf.json.JSONArray; Public class Map2json { Public static void main (string[] args) { map<string, string> map = new hashmap<string, string> (); Map.put (" name"," Zhang San"); Map.put (" Age","a"); Map.put (" gender"," male"); Jsonarray Jsonarray = Jsonarray. Fromobject (map); System. out. println (Jsonarray.tostring ()); } }

Operation Result:

[{"Gender": "Male", "name": "Zhang San", "Age": "22"}]

1.2.2. List conversion to JSON object

List2json.java

Package JSON; Import java.util.ArrayList; Import java.util.List; Import Net.sf.json.JSONArray; public class List2json { public static void Main (string[] args) { list<string> list = new arraylist<string> (); List.add ("AA"); List.add ("BB"); List.add ("CC"); List.add ("DD"); Jsonarray Jsonarray = jsonarray.fromobject (list); System.out.println (Jsonarray.tostring ()); } }

Results:

["AA", "BB", "CC", "DD"]

1.2.3. Java Bean to JSON object

Person.java

Package json; import java.util.Date; Public class person { Private Stringname; Private Stringsex; private int age; Private Stringaddress; Private Datebirthday; Public String GetName () { return name; } Public void setName (String name) { this. name = name; } Public String Getsex () { return sex; } Public void setsex (String sex) { this. sex = sex; } Public int getage () { return age; } Public void setage (int. ) { this. age = age; } Public String getaddress () { return address; } Public void setaddress (String address) { this. address = address; } Public Date Getbirthday () { return birthday; } Public void setbirthday (Date birthday) { this. Birthday = birthday; } Public Person (string name, string sex,int age, string address, Date birthday) { Super (); this. name = name; this. sex = sex; this. age = age; this. address = address; this. Birthday = birthday; } Public Person () { Super (); // TODO auto-generated Constructor stub } }

Bean2json.java

Package JSON; Import Java.util.Date; Import Net.sf.json.JSONArray; public class Bean2json { public static void Main (string[] args) { person person = new person (); person.setaddress (" Shenzhen Futian"); Person.setage (22); Person.setbirthday (New Date ()); person.setname (" Zhang San"); person.setsex (" male"); Jsonarray Jsonarray = jsonarray.fromobject (person); System.out.println (Jsonarray.tostring ()); } }

Operation Result:

[{"Address": "Shenzhen Futian", "Age": "Birthday": {"date": +, "Day": 2, "hours": $, "minutes": "," "Month": 0, "Seconds": "Time ": 1422370042957," Timezoneoffset ": -480," Year ": [+]," name ":" Zhang San "," Sex ":" Male "}]

1.3. JSON conversion to map object

Json2map.java

Package json; import Java.util.HashMap; import Java.util.Map; import java.util.Map.Entry; import Java.util.Set; import Net.sf.json.JSONObject; Public class Json2map { Public static void main (string[] args) { String Jsonstr = "{' Gender ': ' male ', ' name ': ' Zhang San ', ' age ': ' 22 '}"; Jsonobject object = Jsonobject. Fromobject (JSONSTR); map<string,string> map = new hashmap<string,string> (); set<string> KeySet = object.keyset (); for (String Key:keyset) { Map.put (Key, Object.getstring (key)); } set<entry<string,string>> EntrySet = Map.entryset (); for (entry<string, string> entry:entryset) { System. out. println (Entry.getkey () +":"+entry.getvalue ()); } } }

Operation Result:

Gender: Male

Name: Zhang San

Age: 22

Java uses Json-lib to manipulate JSON