How to invoke a restful service in a Java client

In this example, we will see how to use the java.net package utility to create a restful client that accesses the rest service. This is not the simplest way to create a restful client, of course, because you have to read the server-side response yourself, as well as the JSON and Java object conversions.

Request get

public class Javaneturlrestfulclient {

private static final String TargetUrl = "Http://localhost:8080/JerseyJSONExample/rest/jsonServices/print/Jamie";

public static void Main (string[] args) {

try {

URL restserviceurl = new URL (targeturl);

                      HttpURLConnection httpconnection = (httpurlconnection) restserviceurl.openconnection ();
                      Httpconnection.setrequestmethod ("GET");
                      Httpconnection.setrequestproperty ("Accept", "Application/json");

                      if (Httpconnection.getresponsecode ()! =) {
                             throw new RuntimeException ("HTTP GET Request Failed with Error code:"
                                            + httpconnection.getresponsecode ());
                     }

BufferedReader responsebuffer = new BufferedReader (New InputStreamReader (
(Httpconnection.getinputstream ())));

String output;
System.out.println ("Output from Server: \ n");

while (output = Responsebuffer.readline ()) = null) {
SYSTEM.OUT.PRINTLN (output);
}

Httpconnection.disconnect ();

} catch (Malformedurlexception e) {

E.printstacktrace ();

} catch (IOException e) {

E.printstacktrace ();

}

}
}

The results of the run-after output are:

Output from Server:      {"id": 1, "FirstName": "Jamie", "Age": $, "lastName": "Diaz"}

Post submission:

public class Javaneturlrestfulclient {

private static final String TargetUrl = "Http://localhost:8080/JerseyJSONExample/rest/jsonServices/send";

public static void Main (string[] args) {

try {

URL targeturl = new URL (targeturl);

HttpURLConnection httpconnection = (httpurlconnection) targeturl.openconnection ();
Httpconnection.setdooutput (TRUE);
Httpconnection.setrequestmethod ("POST");
Httpconnection.setrequestproperty ("Content-type", "Application/json");

String input = "{\" id\ ": 1,\" firstname\ ": \" liam\ ", \" age\ ": 22,\" lastname\ ": \" marco\ "}";

OutputStream outputstream = Httpconnection.getoutputstream ();
Outputstream.write (Input.getbytes ());
Outputstream.flush ();

                      if (Httpconnection.getresponsecode ()! =) {
                             throw new RuntimeException ("Failed:http Error code:"
                                     + Httpconnection.getresponsecode ());
                     }

                      BufferedReader responsebuffer = new BufferedReader (new InputStreamReader (
                                     (Httpconnection.getinputstream ()));

String output;
System.out.println ("Output from server:\n");
while (output = Responsebuffer.readline ()) = null) {
SYSTEM.OUT.PRINTLN (output);
}

Httpconnection.disconnect ();

} catch (Malformedurlexception e) {

E.printstacktrace ();

} catch (IOException e) {

E.printstacktrace ();

}

}
}

How to invoke a restful service in a Java client