If you lot are thinking is it possible to ship an HTTP asking from a Java programme in addition to if yes, how to ship a uncomplicated HTTP GET asking inwards Java, therefore you lot convey come upwards to the correct place. In this article, I'll demonstrate you lot how you lot tin purpose the HttpURLConnection class from java.net packet to ship a uncomplicated HTTP asking inwards Java. But, commencement allow me response your commencement question, is it possible to ship HTTP asking inwards Java? Yes, it's possible in addition to you lot tin ship whatever sort of HTTP asking e.g. GET, POST, PUT, DELETE, HEAD, or PATCH. The java.net packet provides a shape called HttpURLConnection, which tin travel used to ship whatever sort of HTTP or HTTPS asking from Java program.
Even though the shape is real powerful in addition to back upwards all advanced characteristic of HTTP protocol e.g. you lot tin add together query parameters, you lot tin add together timeouts, you lot tin attach cookies, in addition to you lot tin ship HTTP POST request.
For the sake of simplicity in addition to teach the ball rolling, I'll alone demonstrate you lot how to ship a GET asking in addition to retrieve information inwards your Java program. To teach inwards a petty chip interesting, we'll access Google's Github profile yesteryear writing a Java program.
Once you lot successfully write in addition to execute this program, you lot tin produce to a greater extent than adventurous things amongst HTTP inwards Java yesteryear sending POST request, attaching headers, asking parameters in addition to cookies on your request.
Here is our Java program:
You tin encounter that programme is actually uncomplicated in addition to if you lot hold off at the import nosotros convey used merely a twain of classes e.g. HttpURLConnection in addition to URL from java.net packet in addition to InputStreamReader in addition to BufferedReader shape java.io package.
We convey also used String but that's from the java.lang packet therefore it volition non seem inwards the import statement. If you lot remember, all classes from the java.lang packet is automatically imported into whatever Java program.
Anyway, if you lot hold off at the code, you lot volition encounter that nosotros convey created an URL to connect to https://api.github.com/users/google, which is google's Github profile.
After that, nosotros convey called the URL.openConnection() method which returns an HttpURLConnection. Once you lot got this object, you lot tin encounter diverse fields e.g. asking method, headers, asking parameters in addition to cookies, but for now, nosotros convey merely laid the asking method every bit a GET.
So far, nosotros alone convey things ready, HTTP connecter is non made yet. The connecter volition travel opened upwards when nosotros telephone telephone the getInputStream() on HttpURLConnection object every bit shown below:
We convey wrapped the InputStream into a BufferedReader for fast in addition to effective reading, the InputStreamReader is used to convert a flow to Reader inwards Java.
Since nosotros are converting binary information to text, a graphic symbol encoding volition travel used which volition travel platform's default graphic symbol encoding inwards this case.
Anyway, i time you lot got the BufferedReader setup, it's fourth dimension to read the response. Well, you lot tin also bear witness the response code earlier reading response using below code:
The code inwards the attain of 200 way success, 400 way client-side mistake in addition to 500 way server-side error.
In our program, nosotros are non checking response code but merely reading the response trace of piece of occupation yesteryear line, merely similar nosotros read a file trace of piece of occupation yesteryear line inwards Java. You tin encounter the content of Google's Github profile is printed on the console.
Something like:
That's all close how to ship a uncomplicated HTTP GET asking from Java program without using whatever third-party library. The HtppURLConnection is both powerful in addition to slow but I don't recommend it to purpose inwards real-world production projection because nosotros convey a amend choice inwards price of Apache HttpClient library. If you lot haven't heard close it before, I advise you lot hold off into that every bit it's an of import library for Java developers.
Other Java Articles you lot may like
The Complete Java Master Class for Beginners
Thanks for reading this article therefore far. If you lot similar this tutorial therefore delight portion amongst your friends in addition to colleagues. If you lot convey whatever questions or feedback therefore delight driblet a note.
How
Even though the shape is real powerful in addition to back upwards all advanced characteristic of HTTP protocol e.g. you lot tin add together query parameters, you lot tin add together timeouts, you lot tin attach cookies, in addition to you lot tin ship HTTP POST request.
For the sake of simplicity in addition to teach the ball rolling, I'll alone demonstrate you lot how to ship a GET asking in addition to retrieve information inwards your Java program. To teach inwards a petty chip interesting, we'll access Google's Github profile yesteryear writing a Java program.
Once you lot successfully write in addition to execute this program, you lot tin produce to a greater extent than adventurous things amongst HTTP inwards Java yesteryear sending POST request, attaching headers, asking parameters in addition to cookies on your request.
Here is our Java program:
package tool; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL; /** * * H5N1 uncomplicated representative to ship HTTP asking from Java * */ public class HttpDemo { public static void main(String args[]) throws IOException { URL url = new URL("https://api.github.com/users/google"); HttpURLConnection con = (HttpURLConnection) url.openConnection(); con.setRequestMethod("GET"); BufferedReader in = new BufferedReader(new InputStreamReader( con.getInputStream())); String inputLine; while ((inputLine = in.readLine()) != null) { System.out.println(inputLine); } in.close(); } }
You tin encounter that programme is actually uncomplicated in addition to if you lot hold off at the import nosotros convey used merely a twain of classes e.g. HttpURLConnection in addition to URL from java.net packet in addition to InputStreamReader in addition to BufferedReader shape java.io package.
We convey also used String but that's from the java.lang packet therefore it volition non seem inwards the import statement. If you lot remember, all classes from the java.lang packet is automatically imported into whatever Java program.
Anyway, if you lot hold off at the code, you lot volition encounter that nosotros convey created an URL to connect to https://api.github.com/users/google, which is google's Github profile.
After that, nosotros convey called the URL.openConnection() method which returns an HttpURLConnection. Once you lot got this object, you lot tin encounter diverse fields e.g. asking method, headers, asking parameters in addition to cookies, but for now, nosotros convey merely laid the asking method every bit a GET.
So far, nosotros alone convey things ready, HTTP connecter is non made yet. The connecter volition travel opened upwards when nosotros telephone telephone the getInputStream() on HttpURLConnection object every bit shown below:
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
We convey wrapped the InputStream into a BufferedReader for fast in addition to effective reading, the InputStreamReader is used to convert a flow to Reader inwards Java.
Since nosotros are converting binary information to text, a graphic symbol encoding volition travel used which volition travel platform's default graphic symbol encoding inwards this case.
Anyway, i time you lot got the BufferedReader setup, it's fourth dimension to read the response. Well, you lot tin also bear witness the response code earlier reading response using below code:
int code = con.getResponseCode(); The code inwards the attain of 200 way success, 400 way client-side mistake in addition to 500 way server-side error.
In our program, nosotros are non checking response code but merely reading the response trace of piece of occupation yesteryear line, merely similar nosotros read a file trace of piece of occupation yesteryear line inwards Java. You tin encounter the content of Google's Github profile is printed on the console.
Something like:
That's all close how to ship a uncomplicated HTTP GET asking from Java program without using whatever third-party library. The HtppURLConnection is both powerful in addition to slow but I don't recommend it to purpose inwards real-world production projection because nosotros convey a amend choice inwards price of Apache HttpClient library. If you lot haven't heard close it before, I advise you lot hold off into that every bit it's an of import library for Java developers.
Other Java Articles you lot may like
The Complete Java Master Class for Beginners
Thanks for reading this article therefore far. If you lot similar this tutorial therefore delight portion amongst your friends in addition to colleagues. If you lot convey whatever questions or feedback therefore delight driblet a note.
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