I am trying to fetch data from database using php and send it to java using json. Using java, I wanted to retrieve json values from an arraylist. That arrayList will contain Fruit Object. But in my code, I get values inside arraylist and that arraylist contains LinkedHashMap and not the fruit object. How do I change the php code so that in java side I could get values like ArrayList fruitList = new ArrayList();
<?php
require("phpfunc.fns");
include('Fruit.php');
sqlconnect();
$data = array();
$fruit = new Fruit();
$sql="select * from fruit";
$result=mysql_query( $sql);
$count = 0;
while( $r=mysql_fetch_array($result) ){
//echo $r['lati'].",". $r['longi'] ;
$fruit->setFruitId($r['fruitId']);
$fruit->setAvailable($r['available']);
$data[$count] = $fruit;
$count++;
}
echo json_encode($data);
?>
//java code
public void decodeUsingGSON(String json){
Gson gson = new Gson();
ArrayList fruitList = gson.fromJson(json, ArrayList.class);
for(int i=0; i<fruitList.size(); i++){
Fruit fruit = (Fruit) fruitList.get(i);
System.out.println(fruit.getAvailable());
}
}
You should read up on the Gson documentation . It describes how to handle generic data types and collections . The following should work for you, assuming properly formed JSON:
final Type collectionType = new TypeToken<Collection<Fruit>>(){}.getType();
final Collection<Fruit> fruits = gson.fromJson(json, collectionType);
for(final Fruit fruit; fruits) {
System.out.println(fruit.getAvailable());
}
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