Introduction to JSON and Jsonobject generation JSON

I. INTRODUCTION of JSON

Json:javascript Object Notation (JavaScript object Notation)

XML-like: syntax for storing and exchanging information

Faster and easier to parse than XML

JSON syntax rules:

1. Data in name/value pairs

2, the data is separated by commas

3. Save the object with curly braces

4, square brackets to save the array

JSON value:

1, Number: integer or floating point

2. String: in double quotes

3. Logical value: True False

4. Array: in square brackets

5. Object: In curly braces

6, NULL

Second, using Jsonobject to generate JSON in Java

The required packages

Commons-httpclient-3.1.jar

Commons-lang-2.4.jar

Commons-logging-1.1.1.jar

Json-lib-2.4-jdk15.jar

Ezmorph-1.0.6.jar

Commons-collections-3.2.1.jar

1. The bean is converted to JSON

User U = new user ();
U.setage (22);
U.setusername ("HZUCMJ");
U.setenabled (TRUE);

Jsonobject json = jsonobject.fromobject (u);
System.out.println (Json.tostring ()); The result is: {"Enabled": True, "username": "HZUCMJ", "Age": 22}

2. List is converted to JSON

User U1 = new user ();
U1.setage (22);
U1.setusername ("HZUCMJ");
U1.setenabled (TRUE);

User U2 = new user ();
U2.setage (20);
U2.setusername ("CTF");
U2.setenabled (TRUE);

list<object> list = new arraylist<object> ();
List.add (U1);</p>
List.add (U2);</p>

Jsonarray json = jsonarray.fromobject (list);
System.out.println (Json.tostring ()); The result is: [{"Enabled": False, "username": "CTF", "Age": 20},{"Enabled": False, "username": "", "Age": 0}]

3. Map to JSON

hashmap<string, comparable> map = new hashmap<string, comparable> ();
Map.put ("name", "HZUCMJ");
Map.put ("Age", 22);
Jsonobject JSON = jsonobject.fromobject (map);
System.out.println (Json.tostring ()); The result is: {"name": "HZUCMJ", "Age": 22}

This article is reproduced in part: http://blog.csdn.net/ygzk123/article/details/8273293

Introduction to JSON and Jsonobject generation JSON