How to read the JSON String

Question

Kindly need your help as this really taking me long time to try. From JSP, I passed the stingnify JSON object as a String to the Java action, it like

String jsonDealer = [{"dealerID":"VARSSWK103","dealerName":"Dealer ABC"}, {"dealerID":"VARSSTH008","dealerName":"Dealer XYZ"}]

How I can convert this to JSON object/ or ArrayList of Dealer, so that I can retrieve the dealer ID and dealer name?

Thanks for all help...

Answer 1

You'll need a JSON deserializer. There are quite a few for Java listed at the bottom of the JSON.org page. As of this writing:

• org.json.
• org.json.me.
• Jackson JSON Processor.
• Json-lib.
• JSON Tools.
• json-simple.
• Stringtree.
• SOJO.
• Restlet.
• google-gson.

...and 10 more. :-)

Answer 2

First, download Google GSON.

Second, create this class:

class Dealer {
 Dealer() {}
 public void setDealerID(String dealerID) {
 this.dealerID = dealerID;
 }
 public String getDealerID() {
 return dealerID;
 }
 public void setDealerName(String dealerName) {
 this.dealerName = dealerName;
 }
 public String getDealerName() {
 return dealerName;
 }
 private String dealerID;
 private String dealerName;
}

Third, use this code:

String jsonDealer = "[{\"dealerID\":\"VARSSWK103\",\"dealerName\":\"Dealer ABC\"}, {\"dealerID\":\"VARSSTH008\",\"dealerName\":\"Dealer XYZ\"}]";
Gson gson = new Gson();
Type type = new TypeToken<List<Dealer>>(){}.getType();
List<Dealer> fromJson = gson.fromJson(jsonDealer, type);
System.out.println(fromJson.get(0).getDealerName()); // example usage

• T.J. Crowder: +1, although there are, of course, lots of other options. Google GJSON isn't the only game in town...
• darioo: @T.J. Crowder: of course, but since I have only GSON set up, why not give a concrete example?
• T.J. Crowder: Sure, and that's why I voted it up. It's just that the answer doesn't give any indication that one has options. I'm a big fan of options.

Answer 3

You will need a json parsing api like gson to parse the json string. Follow the simple tutorial in my website http://preciselyconcise.com/apis_and_installations/json_to_java.php

Answer 4

You probably need a JSON library for Java which can parse the string into an object / collection.

I'm not a Java expert myselft, but this list might have somethng suitable: http://www.json.org/java/