Java constructs and parses JSON data in one of two ways

First, Introduction

The Json-lib package is a Beans,collections,maps,java arrays and XML and JSON to convert the package, is mainly used to parse JSON data, on its official website http://www.json.org/detailed explanation, Interested to be able to study.

Download jar Dependency Package: You can go here to download

Iii. Introduction to the basic methods

1. Convert list collection to JSON method

New ArrayList (); List.add ("First" ); List.add ("second" ); Jsonarray jsonArray2 = jsonarray.fromobject (list);  

2. Map collection into JSON method

New HashMap (); Map.put ("Name", "JSON"), Map.put ("bool"new Integer (1new string[] {"A", "B" }); Map.put ("func", "function (i) {return this.arr[i];}" ); Jsonobject JSON = jsonobject.fromobject (map);     

3. The bean is converted into JSON code

Jsonobject jsonobject = Jsonobject.fromobject (new Jsonbean ());

4. Convert arrays into JSON code

True }; Jsonarray jsonArray1 = Jsonarray.fromobject (Boolarray);

5. Conversion of general data into JSON code

Jsonarray jsonArray3 = Jsonarray.fromobject ("[' json ', ' is ', ' easy ']");

6. Beans conversion to JSON code

Newnew JsonBean2 (); Jb1.setcol (1); Jb1.setrow (1); Jb1.setvalue ("xx"new JsonBean2 (); Jb2.setcol (2); Jb2.setrow (2); Jb2.setvalue (""); List.add (JB1); List.add (JB2); Jsonarray ja = jsonarray.fromobject (list);        

Iv. Demonstration Examples

Here are some basic common methods for testing

PackageCom.json;ImportJava.util.ArrayList;ImportJava.util.HashMap;ImportJava.util.List;ImportJava.util.Map;ImportNet.sf.json.JSONArray;ImportNet.sf.json.JSONObject;/*** Construct and parse JSON data using Json-lib * *@authorAlexia * @date 2013/5/23 **/PublicClassjsontest {/*** Construct JSON Data * *@return*/PublicStaticString Buildjson () {//JSON-formatted data parsing object Jsonobject Jo =NewJsonobject ();//The following constructs two maps, a list, and an Employee object map<string, string> map1 =New Hashmap<string, string>(); Map1.put ("name", "Alexia"); Map1.put ("Sex", "female"); Map1.put ("Age", "23"); map<string, string> map2 =New Hashmap<string, string>(); Map2.put ("name", "Edward"); Map2.put ("Sex", "male"); Map2.put ("Age", "24"); list<map> list =New arraylist<map>(); List.add (MAP1); List.add (MAP2); Employee Employee =NewEmployee (); Employee.setname ("Wjl"); Employee.setsex ("female"); Employee.setage (24);//Convert map to Jsonarray data Jsonarray ja1 =Jsonarray.fromobject (MAP1);//Convert list to Jsonarray data Jsonarray JA2 =Jsonarray.fromobject (list);//Convert bean to Jsonarray data jsonarray ja3 =Jsonarray.fromobject (employee); System.out.println ("Jsonarray Object Data format:"); System.out.println (Ja1.tostring ()); System.out.println (Ja2.tostring ()); System.out.println (Ja3.tostring ());//Constructs JSON data, including a map and an employee object Jo.put ("map", JA1); Jo.put ("Employee", JA2); System.out.println ("\ n final constructed JSON data format:"); System.out.println (Jo.tostring ());ReturnJo.tostring (); }/*** Parse JSON data * *@paramJsonstring JSON Data string*/PublicStaticvoidParsejson (String jsonstring) {//Take employee as an example, map similar to jsonobject JB =Jsonobject.fromobject (jsonstring); Jsonarray ja = Jb.getjsonarray ("Employee"); List<employee> emplist =New arraylist<employee>();//Loop to add an employee object (there may be multiple)for (int i = 0; I < ja.size (); i++) {Employee Employee =NewEmployee (); Employee.setname (Ja.getjsonobject (i). getString ("name")); Employee.setsex (Ja.getjsonobject (i). getString ("Sex")); Employee.setage (Ja.getjsonobject (i). GetInt ("Age")); Emplist.add (employee); } System.out.println ("\ n convert JSON data to employee object:"); for (int i = 0; i < emplist.size (); I++) {Employee emp = Emplist.get (i); System.out.println ("Name:" + emp.getname () + "Sex:" + emp.getsex () + "Age:" + Emp.getag E ()); }} /**  @param  args */public static Span style= "color: #0000ff;" >void Main (string[] args) {//  TODO auto-generated method Stub Parsejson (Buildjson ()) ; }} 

The operation results are as follows

Ext.: http://www.cnblogs.com/lanxuezaipiao/archive/2013/05/23/3096001.html

Java constructs and parses JSON data in one of two ways