How to use Flexjson JSONDeserializer?

java json deserialization flexjson
saurabh ranu picture saurabh ranu · Aug 17, 2011 · Viewed 8.2k times · Source

I have a string:

 [{"product_id":"2","name":'stack"'},{"product_id":"2","name":"overflow"}]"

How can I use Flexjson's JSONDeserializer to obtain all product_ids from the above string?

I have a class called productinformation which has fields like product_id and name.

Answer

Rob Tanzola picture Rob Tanzola · Aug 18, 2011

You could use the JSONDeserializer.use() methods to tell it how to deserialize the array and each object in the array, in this case of class ProductInformation . The product_id attribute does not match up with the standard naming that flexjson expects, so your properties on the object will need to have an underscore in them.

String products= "[{\"product_id\": \"123\",\"name\":\"stack\"},{\"product_id\": \"456\",\"name\":\"overflow\"}]";
List<ProductInformation> productInfoList = new JSONDeserializer<List<ProductInformation> >()
    .use(null, ArrayList.class)
    .use("values",ProductInformation.class)
    .deserialize(products);

for(ProductInformation productInformation : productInfoList){
    System.out.println(productInformation.getProduct_id();
}

The section on "Deserialization Without the Training Wheels" in Deserialization section of the docs goes into additional details on the other cases to consider if the type information is not included in the JSON string.

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