CODEWITHSUNDEEP
javagsonjson
Scott Chamberlain
Scott Chamberlain

Reputation: 127603

Converting from json to a class with gson does not appear to do anything

I am attempting to deserialize a json string using gson. Here is my code

static class ReturnPramaters {
    public ReturnPramaters()
    {
    }
    public Boolean LoginFailed = true;
    public String LoginFailedReason = "";
    public String AppPath  = "";
    public String WorkstiaonGuid = "";
    public String RDPUsername  = "";
    public String RDPPassword  = "";
    public int StartMode = -1;
    public String ServerAddress  = "";
}
public static void main(String[] args) {
    String json = sendGetRequest("http://example.com:80/Rdp/json/login","username=test&password=1234");
    Gson gson = new Gson();
    ReturnPramaters para = gson.fromJson(json, ReturnPramaters.class);
    if(para.LoginFailed)
        JOptionPane.showMessageDialog(null, para.LoginFailedReason, "Login Failed",JOptionPane.ERROR_MESSAGE);
    else {
        //...
    }
}

here is my json string that is retured from the get request.

"{"d":{"__type":"ReturnPramaters:#ServerApp","AppPath":"C:\\Remote Desktop Manager\\Launcher\\Launcher.exe","LoginFailed":false,"LoginFailedReason":null,"RDPPassword":"XjE2QAL","RDPUsername":"test09","ServerAddress":"example.com","StartMode":1,"WorkstiaonGuid":"96175701-f72a-44e9-8ee1-6eb756293654"}}"

However after ReturnPramaters para = gson.fromJson(json, ReturnPramaters.class); para still has all of it's uninitialized values. What is going wrong that is causing this to fail?

Upvotes: 1

Views: 1699

Answers (3)

Mike Yockey
Mike Yockey

Reputation: 4593

Your type class is static. Is that going to work?

Upvotes: 0

Peter Knego
Peter Knego

Reputation: 80340

It seems that JSON you are mapping to is wrapped in another object with d and _type fields.

So create a simple wrapper Class:

class JsonWrapper{
    public ReturnPramaters d;
}

Upvotes: 3

Nishant
Nishant

Reputation: 55866

try truncating the incoming string before passing to GSON, so that it looks like this

"{
    "AppPath":"C:\\Remote Desktop Manager\\Launcher\\Launcher.exe",
    "LoginFailed":false,
    "LoginFailedReason":null,
    "RDPPassword":"XjE2QAL",
    "RDPUsername":"test09",
    "ServerAddress":"example.com",
    "StartMode":1,
    "WorkstiaonGuid":"96175701-f72a-44e9-8ee1-6eb756293654"
}"

The object that you currently have in JSON represents the following Java object

public class MyClass{
  ReturnPramaters d;
}

Upvotes: 1

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