Java Reference
In-Depth Information
add method
Description
add(String name, double value)
This adds a
JsonNumber
representation of a
double
value to the generated JSON object
add(String name, int value)
This adds a
JsonNumber
representation of
an
int
value to the generated JSON object
add(String name,
JsonArrayBuilder builder)
This adds an array of JSON objects to the
generated JSON object
add(String name,
JsonObjectBuilder builder)
This adds another JSON object to the
generated JSON object
add(String name, JsonValue
value)
This adds an implementation of the
JsonValue
interface to the generated JSON
object
add(String name, long value)
This adds a
JsonNumber
representation of a
long
value to the generated JSON object
add(String name, String value)
This adds a string value to the generated
JSON object
Lets go back to our example. After invoking the chain of
add()
methods, we invoke
the
build()
method on the resulting
JsonObjectBuilder
implementation. This
method invocation returns an instance of a class implementing
JsonObject
.
Once we have a
JsonObject
implementation, typically we would want to convert
it to its string representation. To convert a
JsonObject
implementation to a JSON
string, we need to invoke the static
createWriter()
method on the
Json
class,
passing a new instance of
StringWriter
as a parameter. This method returns an
instance of a class implementing the
JsonWriter
interface. Now, we need to invoke
the
writeObject()
method of
JsonWriter
, passing the
JsonObject
instance
we previously created as a parameter. This method invocation populates the
StringWriter
object we used to create our
JsonWriter
interface. We can obtain
the JSON string representation of our object by simply invoking the
toString()
method of our
StringWriter
object.
Our example in action
Our example consists of a simple web application that uses JSF to populate a CDI
named bean and generates a JSON string from this bean. The markup for our simple
JSF page populating the CDI named bean is as follows:
<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://xmlns.jcp.org/jsf/html">
