Gson for Android

{

"ID": 912345678901,

"Age": 33,

"Text": "How do I stream JSON in Java? ",

"Geo": NULL,
}

If the red part indicates that it may be null, the following name. Equals ("Geo") & reader. Peek () are required during the judgment ()! = Jsontoken. null

If you do not want to parse the JSON field in the orange part, you need to add an else statement at the time of judgment as follows: else {reader. skipvalue ()}

 

Then there are some examples, all of which are JSON combinations and updated from time to time.

1.The actual JSON data is followed by the corresponding code content.

{

"ID": 912345678901, "text": "How do I stream JSON in Java? "," Geo ": NULL," user ": {" name ":" json_newb "," followers_count ": 41 }} reader. beginobject ();
While (reader. hasnext ()){
String name = reader. nextname ();
If (name. Equals ("ID ")){
System. Out. println ("ID:" + reader. nextlong ());
} Else if (name. Equals ("text ")){
System. Out. println ("text:" + reader. nextstring ());
} Else if (name. Equals ("Geo") & reader. Peek ()! = Jsontoken. null ){
System. Out. println ("text:" + reader. nextstring ());
} Else if (name. Equals ("user ")){
Usernameobject ();
} Else {
Reader. skipvalue ();
}
}
Reader. endobject ();

Private void usernameobject () throws ioexception {
Reader. beginobject ();
While (reader. hasnext ()){
String nxtname = reader. nextname ();
If (nxtname. Equals ("name ")){
System. Out. println ("nxtname:" + reader. nextstring ());
} Else if (nxtname. Equals ("followers_count ")){
System. Out. println ("nxtname:" + reader. nextint ());
}

}

2.

[{"ID": 912345678901, "text": "How do I stream JSON in Java? "," Geo ": NULL," user ": {" name ":" json_newb "," followers_count ": 41 },{" ID ": 777777777888," text ": "dfngsdnglnsldfnsl", "Geo": NULL, "user": {"name": "dsfgpd", "followers_count": 24 }}

]

Reader. beginarray ();
While (reader. hasnext ()){
Reader. beginobject ();
While (reader. hasnext ()){
String name = reader. nextname ();
If (name. Equals ("ID ")){
System. Out. println ("ID:" + reader. nextlong ());
} Else if (name. Equals ("text ")){
System. Out. println ("text:" + reader. nextstring ());
} Else if (name. Equals ("Geo") & reader. Peek ()! = Jsontoken. null ){
System. Out. println ("text:" + reader. nextstring ());
} Else if (name. Equals ("user ")){
Usernameobject ();
} Else {
Reader. skipvalue ();
}
}
Reader. endobject ();
}

Reader. endarray ();

3.

{"Statuses": [{"ID": 912345678901, "text": "How do I stream JSON in Java? "," Geo ": NULL," user ": {" name ":" json_newb "," followers_count ": 41 },{" ID ": 777777777888," text ": "dfngsdnglnsldfnsl", "Geo": NULL, "user": {"name": "dsfgpd", "followers_count": 24}]

}

Reader. beginobject ();
While (reader. hasnext ())
{
String begin = reader. nextname ();
If (begin. Equals ("statuses "))
{
Array ();
}
}
Reader. endobject ();

Private void array () throws ioexception {
Reader. beginarray ();
While (reader. hasnext ()){
Reader. beginobject ();
While (reader. hasnext ()){
String name = reader. nextname ();
If (name. Equals ("ID ")){
System. Out. println ("ID:" + reader. nextlong ());
} Else if (name. Equals ("text ")){
System. Out. println ("text:" + reader. nextstring ());
} Else if (name. Equals ("Geo") & reader. Peek ()! = Jsontoken. null ){
System. Out. println ("text:" + reader. nextstring ());
} Else if (name. Equals ("user ")){
Usernameobject ();
} Else {
Reader. skipvalue ();
}
}
Reader. endobject ();
}
Reader. endarray ();
}

Private void usernameobject () throws ioexception {
Reader. beginobject ();
While (reader. hasnext ()){
String nxtname = reader. nextname ();
If (nxtname. Equals ("name ")){
System. Out. println ("nxtname:" + reader. nextstring ());
} Else if (nxtname. Equals ("followers_count ")){
System. Out. println ("nxtname:" + reader. nextint ());
}
}
Reader. endobject ();

}