[Json] json-lib: simple processing of converting a java object into a json object

Thanks to js's native support for json, json is widely used for data transmission in many projects. How can we convert data from a java object to a json object? How can we convert the foreground json object to a java object for processing?

This is a common problem in development.

Json-lib is an open-source project of sourceforge. It is often used to solve the problem of java json data conversion.

 

However, some dependent packages are required for normal use.

Commons-beanutils-1.8.0.jar

Commons-collections-3.1.jar

Commons-logging-1.1.1.jar

Commons-logging-api-1.1.jar

Ezmorph-1.0.6.jar

Commons-lang-2.4.jar !! Jar of 3.x cannot be run.

Here are the packages

 

Because the doc on the official website cannot be opened, I read others' blogs.

Here are several small cases of json conversion in java -".

Person. java javabean Model

 

[Java]
Package com. lzz. json;
 
Public class Person {
Private int id;
Private String name;
Private String addr;

Public Person (){}

Public Person (int id, String name, String addr ){
Super ();
This. id = id;
This. name = name;
This. addr = addr;
}
 
Public int getId (){
Return id;
}
 
Public void setId (int id ){
This. id = id;
}
 
Public String getName (){
Return name;
}
 
Public void setName (String name ){
This. name = name;
}
 
Public String getAddr (){
Return addr;
}
 
Public void setAddr (String addr ){
This. addr = addr;
}
}

Package com. lzz. json;

Public class Person {
Private int id;
Private String name;
Private String addr;
 
Public Person (){}
 
Public Person (int id, String name, String addr ){
Super ();
This. id = id;
This. name = name;
This. addr = addr;
}

Public int getId (){
Return id;
}

Public void setId (int id ){
This. id = id;
}

Public String getName (){
Return name;
}

Public void setName (String name ){
This. name = name;
}

Public String getAddr (){
Return addr;
}

Public void setAddr (String addr ){
This. addr = addr;
}
}

Here are several operation cases

SimpleJavaToJson. java

 

[Java]
Package com. lzz. json;
 
Import java. util. ArrayList;
Import java. util. HashMap;
Import java. util. List;
Import java. util. Map;
 
Import net. sf. json. JSONArray;
Import net. sf. json. JSONObject;
 
/*** Ref http://ryxxlong.iteye.com/blog/583862
* Json supports native js
* Using eval can be directly changed to js objects.
* JSON Java
* String <=> java. lang. String, java. lang. Character, char
* Number <=> java. lang. Number, byte, short, int, long, float, double
* True | false <=> java. lang. Boolean, boolean
* Null <=> null
* Function <=> net. sf. json. JSONFunction
* Array <=> net. sf. json. JSONArray (object, string, number, boolean, function)
* Object <=> net. sf. json. JSONObject
*/
 
Public class SimpleJavaToJson {
Public static void main (String [] args ){
/* Json objects programmed from java for the set type */
// ArrayJson ();
// ListJson ();
// StringJson ();

/* Map-type processing */
MapJson ();

/* Processing of javabean */
BeanJson ();
}

// Array Processing
Public static void arrayJson (){
String arr [] = {"lzz", "12", "ee "};
JSONArray jarr = JSONArray. fromObject (arr );
System. out. println (jarr );
}

// List Processing
Public static void listJson (){
List <String> list = new ArrayList <String> ();
List. add ("apple ");
List. add ("orange ");
List. add ("money ");
JSONArray jlist = JSONArray. fromObject (list );
System. out. println (jlist );
}

// String format the string must conform to the json set format.
Public static void stringJson (){
String str = "['A', 'B', 'C', {d: 'A'}]";
JSONArray jarr = JSONArray. fromObject (str );
System. out. println (jarr );
}

// Convert the map type to json format, and the generated json objects are not ordered.
Public static void mapJson (){
Map map = new HashMap ();
Map. put ("name", "apple ");
Map. put ("age", new Integer (20 ));
Map. put ("haoren", Boolean. TRUE );
Map. put ("arr", new String [] {"a", "B", "c "});
JSONObject jobj = JSONObject. fromObject (map );
System. out. println (jobj );
}

// Json conversion of javabean
Public static void beanJson (){
Person p = new Person (101, "apple", "China ");
JSONObject jobj = JSONObject. fromObject (p );
System. out. println (jobj );
}

}