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Asked: 2026-06-15T15:21:21+00:00

I’m doing an ipad app. Actually, I’m converting a java applet application to the

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I’m doing an ipad app. Actually, I’m converting a java applet application to the ipad version. I’ve got a lot of problems.

In the original java applet code, there are some http POST request, and it will receive some data from the java server.

        httpCon=(HttpURLConnection) cmdURL.openConnection();
        httpCon.setRequestMethod("POST");
        httpCon.addRequestProperty("cmd", cmd);
        httpCon.addRequestProperty("arg", arg);
        httpCon.setDoInput(true);

and then, receive data:

        inputStream=httpCon.getInputStream();
        ObjectInputStream ois=new ObjectInputStream(inputStream);
        Document doc=(Document)ois.readObject();
        rData[2]=doc;

now, I want to do the same thing using objective-c:

NSURL * url = [NSURL URLWithString:@"http://192.168.1.4:801/cmd"];
NSMutableURLRequest * request = [NSMutableURLRequest requestWithURL:url];

[request setHTTPMethod:@"POST"];
[request setValue:[NSString stringWithFormat:@"%@",cmd] forHTTPHeaderField:@"cmd"];
[request setValue:[NSString stringWithFormat:@"%@",arg] forHTTPHeaderField:@"arg"];

[NSURLConnection connectionWithRequest:request delegate:self];

_responseData is the data received:

    - (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response{
        _responseData = [NSMutableData data];}

    - (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
        [_responseData appendData:data];
    }

So, what should I do next? And there is a Document class in the java applet code, is there any similar class in the objective-c?

=======UPDATE=======

the java server returns the xml as the Document instance. Can I use the _responseData as an xml file directly? Or I have to do additional steps before dealing with the _responseData?

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1 Answer

  1. Editorial Team

    you cant use java object streams in objC. It is meant to send java object

    … well in thoery you could IF you reverse engineered the protocol the objectStream uses but that’s a lot of work and a maintenance hell (I guess) –
    I would look into Using a common exchange format.. json or xml maybe!

    after your edit:
    I dont know the xml the objectstream sends but in theory you can just parse it and setup a custom objC class with it.
    I also dont know what the Document class is or does or where its from so I cant say if there’s an equivalent in Java. I tend towards no.

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