Send HTTP GET Request using Java 11 HttpClient and parse JSON response into objects
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- čas přidán 4. 09. 2024
- In this tutorial, you will learn how to make an HTTP request in Java using the HttpClient class from Java 11.
When you have completed this tutorial you should understand:
✅ What is the HttpClient class and why would you need it
✅ Use Java HttpClient to send an HTTP GET Request
✅ Call a REST Client in Java
✅ Use Jackson Databind to parse JSON into Java Objects
✅ Use a reference method to print out each Java Object
🔗Resources & Links mentioned in this video:
Source Code: github.com/dan...
👋🏻Connect with me:
Website: www.danvega.dev
Twitter: / therealdanvega
Github: github.com/dan...
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LinkedIn: / danvega
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I almost thought it is impossible to learn http requests in java from the internet until i saw this video, thanx man. Great video by the way
Wow, that is so awesome of you to say. Thank you for watching.
Nice! Lot's of API's out there with data returned in JSON format - this tutorial is exactly what I needed to get started! Learning about the .forEach was also a bit of a bonus. I think all I need to do is find this done asynchronously and I'm all set ...
Glad it helped!
Dan, thank you so much for this tutorial!
I'm completely new to Java, and I feel that there are very few resources for learning these materials (compared to something like NodeJS or Python). It's greatly appreciated!
Thanks man. Great tutorial!
Simple and easy to understand. The best tutorial of http request in the internet.
You saved my life, thank you for this video i had about two days with this topic and it was so easy.
I used to hate Java, but you just did make I love it.
Its great! Thanks very much!!! Please do more....
Thank you!!..you made it simple and easy to understand.
Glad it helped!
Great tutorial! Thank you so much! 💛
This video helped me a lot in my learning phase. Thanks.
Great toturial man thanks.
Could you please make a toturial for Post method ?
specially for this scenario :
- Post a Json object ( which include user and pass)
- get the value for token in response body.
Thank you very much. You helped me understand HttpClient Get() method.
Perfect tutorial.
that was very easy to understand, would you kindly make a video in consuming rest services using authentications , and web tokens
Thanks man. Great tutorial!
Have you ever thought about a new video about Spring boot + GraphQl or Spring boot + GraphQl + security?
I think it's a great topic for 2020.
Thank you. I have really been enjoying using GraphQL on my personal site this past year. Yes, Spring Boot + GraphQL is on my list.
how to add password and username for authentication?
It was very helpful, thanks a lot :)
You're welcome!
excelente tutorial saludos desde argentina
Nice!. Thanks for the g8 video.
Thanks for watching!
video starts from 6:03. thank me later
Thanky ou this is exactly what i needed
Glad I could help out, let me know if you have any other questions about clients in Java
This may be a dumb question, but what if you only need to access a few specific fields of your Json object? For instance if I was using a geocoding api and only needed to return the latitude and longitude. Thanks for the video extremely helpful!
You've probably already figured this out, but you can just add the annotation "@JsonIgnoreProperties(ignoreUnknown=true)" to the object class and then you only have to include variables in the class for the specific fields you want.
Do you think adding application related functionality directly into a programming language somehow defeat incentive to learn the language itself?
Not at all. Having to write low level code to interact with Http doesn't sound like fun to me. Program languages give us the ability to perform common tasks and I think this is a great abstraction here.
Is it possible to set multiple headers in our GET/POST method? In my program I need to set the authorization header (basicAuth), and I wonder if I can also set the content type.
very cool, thanks!
No problem!
Tks Dan , very useful. how about to get an image ?
Is it possible to map the response with body handler itself ?
Thank you for this tutorial.
Thanks for watching 😊
Hey Dan - great tutorial!! - What would you recommend when your JSON is a map....ie `{"someData": [{a: 1, b: 2}]}` and all I want is the "someData" value.
Map posts = mapper
.readValue(response.body(), new TypeReference() {});
posts.get("someData") //
awesome tutorial :)
How one can use interceptor to maintain session cookies for okHttpclient with core Java?
I'm able to retrieve the data from the API, but but I get IllegalStateException("Cipher not initialized"). Can I prevent this?
Can you show us how to unit test it please? with mockito
Great Tutorial!
Can someone explain on how to unit test these requests, responses using mockito ?
I need this option in single java class file without any server like tomcat,glassfish or others
When I try in single java class, I says error: No classdef error HTTPurirequest not found
How to fix this
Thank you so much!
Good content Bro 👌
Thanks for the information. I have a question : how can we send a get request with parameters using HttpClient in java 11?
I am curious about this as well. I've been looking for an answer and have yet to find one.
How would this work for nested Json?
If i want to consume this web service then how can get object reference of Post class
I'm getting this error, could you please help me out
readValue(JsonParser, Class) in the type ObjectMapper is not applicable for the arguments (Object, new TypeReference(){})
Never mind, fixed it, programming in a nut shell🤣
One second : no idea what's going on
After making minor changes : I'm the best 🤣😉
Thanks for the great video.
what if we want to send a jwt token.
Fantastic video! Thanks so much for taking the time to share it. I'm not fluent in Java but your video was still understandable and useful! One thing though, for future reference, the proper pronunciation of JSON is "jaysun", rather than "jay-sawn". 😀
"There's a lot of argument about how you pronounce that. I strictly don't care. I think the proper pronunciation is probably..." and then the guy uses a strange french-sounding pronunciation.
So who said this? Well that'd be Douglas Crockford, the guy who invented the format. He says it like you do "jaysun". And I know this comment is old, but it's one of the top of this video so I'ma just... correct that number and that statement and move on, have a nice day ^_^
is there a way to send a body on request in a get method?
Use Postman tool. It has an inbuilt option to do that
How to login to Salesforce using Java 11 httpclient
How get auth token and instanceUrl??
how can we achieve this with localhost?
I need to send first an authentication request to get SESSION ID cookie and then make another request to get the data. Do you have a video about this, or know where i can read it? Im having a hard time finding material
did you get solution of above query? I have same problem, let me know , If you got solution.
@@alpanajyoti7774 String cookie = response.headers().firstValue("Set-Cookie").toString();
String cCookie = cookie.replaceAll(".+\\[", "");
String cleanCookie = cCookie.split(";")[0];
System.out.println(cleanCookie)
Then on the second request: .setHeader("Cookie",cleanCookie)
Why my one says GET() is undefined?
Do you have the correct imports?
docs.oracle.com/en/java/javase/11/docs/api/java.net.http/java/net/http/HttpRequest.Builder.html
I am getting exception when i invoke this "PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:131)"
what was that intro ?
It was an old intro I had made. I don't use it anymore though
@7:30
Honestly after all that ima just consider learning python to use requests easier wtf xD