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JAVA POST request and then redirect to it?

What I need to do is send POST request to specific URL with two parameters and when the request is sent, I need to redirect user to that link so that he would be able to access functionality.
So far, what I have managed to do from various examples is this:
private void postRemoteAdvisoryLink() throws IOException {
URL obj = new URL(KdrmApplicationContext.getRemoteAdvisoryUrlPath());
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
con.setConnectTimeout(60000);
con.setRequestMethod("POST");
con.setRequestProperty("User-Agent", "Mozilla/5.0");
con.setRequestProperty("Accept-Language", "en-US,en;q=0.5");
// For post only - start
con.setDoOutput(true);
OutputStream os = con.getOutputStream();
os.write(("?auth=ssor&TransportKey=" + ssorTransportKey).getBytes());
os.flush();
os.close();
int responseCode = con.getResponseCode();
}
The problem is that now I get connection time out when trying to execute OutputStream os = con.getOutputStream(); line. Also, I still have no idea how to redirect user when request is completed.
Any ideas?

Using the basic Java URL classes would require you to manually handle the details of HTTP protocol - it's better to use libraries like Apache Http Components, as they deal with the underlying protocols for you. Some examples including POST requests can be found on their website.
Given the original question, the Timeout is likely related to host not responding or your Java application being unable to connect to given URL (due to no proxy configuration for example).
If you want to redirect a request based on the answer, you need to check the response headers and http status - if the status is 302, then there should be a header called Location, which will contain the URL you should make another request to.
Before getting an OutputStream, also make sure to set the Content-Length header (and ideally the Content-Type header as well).

How to send info in body using post method in java class file

I requested to send some parameters from java file using post method. I did
String urlParameters = "param1=a&param2=b&param3=c";
URL url = new URL("http://testing/index.jsp");
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream());
writer.write(urlParameters);
writer.flush();
But from receiver's end asks me to send it in body instead of url parameter. I am not sure what I am doing wrong. Please explain me how this code will work and what changes has to be done if I want to send info in request body.

i believe you either need to call the connect() method on the URLConnection at the end, or call a method that would cause the connect to be called for you, like fetching the resulting input stream.
Also you should think about what format the body should be in. Often people like to use standard formats like json, but you will have to decide that between you and the people implementing the server.

How to set character encoding in SOAP request

I am calling a SAP SOAP Service from a web servlet in Java. For some reason SAP is giving me an error every time I use special characters in the fields of my request such as 'è' or 'à'. The WSDL of the SOAP Service is defined in UTF-8 and I have set my character encoding accordingly as you can see below. However I am not sure this is the correct way. Also, notice that if I use SOAP UI (with the same envelope) the request works correctly so it must be something on Java side.
URL url = new URL(SOAP_URL);
String authorization = Base64Coder.encodeString(SOAP_USERNAME + ":" + SOAP_PASSWORD);
String envelope = "<soapenv:Envelope xmlns:soapenv='http://schemas.xmlsoap.org/soap/envelope/' xmlns:urn='urn:sap-com:document:sap:soap:functions:mc-style'><soapenv:Header/><soapenv:Body><urn:ZwsMaintainTkt><item>à</item></urn:ZwsMaintainTkt></soapenv:Body></soapenv:Envelope>";
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setReadTimeout(SOAP_TIMEOUT);
con.setRequestMethod("POST");
con.setRequestProperty("Content-type", "text/xml; charset=utf-8");
con.setRequestProperty("SOAPAction", SOAP_ACTION_ZWSMANTAINTKT);
con.setRequestProperty("Authorization", "Basic " + authorization);
con.setDoOutput(true);
con.setDoInput(true);
OutputStreamWriter outputStreamWriter = new OutputStreamWriter(con.getOutputStream());
outputStreamWriter.write(envelope);
outputStreamWriter.close();
InputStream inputStream = con.getInputStream();

Since a soap-request is xml use the xml-header to specify the encoding of your request:
<?xml version="1.0" encoding="UTF-8"?>
new OutputStreamWriter(con.getOutputStream()) uses the platform-default encoding which most probably is some flavour of ISO8859. Use new OutputStreamWriter(con.getOutputStream(),"UTF-8") instead

java SE. How to send post request with binary file?

I am working on a java app, to upload images on yfrog.com.
I can post on the API page successfully but without binary files just with a string parameters.
Also the method I use only accept "String".
URLConnection conn = url.openConnection();
conn.setDoOutput(true);
OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
wr.write(data);
wr.flush();
wr.write(data); accept String only.
I tried to put the image path but it doesn't work.

Do yourself a favor and take a look at Apache HttpComponents.

How do I add cookies in a post request in Java?

I was trying to get a certain page through java, but with this page I didn't succeed.
Now in my browser it does work, but when I disable Cookies in the settings, it doesn't anymore.
So I probably need to add cookies to my post request in java.
So I went searching the interwebs, but unfortunately I couldn't really find anything useful. mostly it was vague, scattered or irrelevant.
So now my question :
Could anyone show me how to do it (mentioned above^^), or point me to a clear site?

Here's a simple example of setting a cookie in a POST request with URLConnection:
URL url = new URL("http://example.com/");
String postData = "foo bar baz";
URLConnection con = url.openConnection();
con.setDoOutput(true);
con.setRequestProperty("Cookie", "name=value");
con.setRequestProperty("Content-Type", "text/plain; charset=utf-8");
con.connect();
OutputStreamWriter out = new OutputStreamWriter(con.getOutputStream(), "UTF-8");
out.write(postData);
out.close();
You probably need to pass a cookie from a previous request, see this answer for an example. Also consider using Apache HttpClient to make things easier.

URL url = new URL("http://hostname:80");
URLConnection conn = url.openConnection();
conn.setRequestProperty("Cookie", "name1=value1; name2=value2");
conn.connect();