![]() ![]() * This executes a call against the Yahoo Weather API service, which is * A simple Java REST GET example using the Apache HTTP library. Here's the source code for this first example class. Hopefully you can try this against different URLs where you can examine the header information in more detail. I wish I could have provided this demo with the OpenSSO demos I wrote a few years ago (see my PHP OpenSSO REST API examples), because the OpenSSO REST API made extensive use of header information. It also shows how to get all of the headers from the web service you're calling. This REST client uses the following Apache HttpClient classes: That service actually returns information in an RSS format, but if you don't mind parsing that XML, it's an easy way to get weather updates. This first example shows a combination of these Apache HttpClient classes used to get information from the Yahoo Weather API. But hopefully these examples will make other POST or other RESTful examples easier to read. The REST client examples I share here are based on the examples on the HttpClient website I've mostly just tried to make them a little easier to read, and add some additional documentation to them.Īlso, I'm just focusing on HTTP GET requests in this article, because I'm writing real-world code to hit the Twitter REST API, and all I need right now are GET requests. In this article I share some source code for some simple Java REST clients that use the Apache HttpClient project. Import .client.I started writing some Java REST (RESTful) clients lately, and in doing so, I've been looking at several different ways to do this, including using the Apache HttpClient project, the Jersey project, Apache CXF, and more. HttpResponse httpresponse = httpclient.execute(httpget) įollowing is an example program which demonstrates the execution of a HTTP request against a target site that requires user authentication. Step 6 - Create a HttpGet object and execute itĬreate a HttpRequest object by instantiating the HttpGet class. Set the CredentialProvider object created in the previous step to the client builder by passing it to the CredentialsProvider object() method as shown below.Ĭlientbuilder = tDefaultCredentialsProvider(credsProvider) īuild the CloseableHttpClient object using the build() method of the HttpClientBuilder class.ĬloseableHttpClient httpclient = clientbuilder.build() You can set the above created credentialsPovider object to a HttpClientBuilder using the setDefaultCredentialsProvider() method. HttpClientBuilder clientbuilder = HttpClients.custom() Step 3 - Create a HttpClientBuilder ObjectĬreate a HttpClientBuilder using the custom() method of the HttpClients class. New UsernamePasswordCredentials("abc", "passwd")) New UsernamePasswordCredentials("user", "mypass")) ĬtCredentials(new AuthScope("localhost", 8000), Set the credentials using the setCredentials() method for both host and proxy as shown below −ĬtCredentials(new AuthScope("", 80), This method accepts two objects as given below −ĪuthScope object − Authentication scope specifying the details like hostname, port number, and authentication scheme name.Ĭredentials object − Specifying the credentials (username, password). You can set the required credentials to the CredentialsProvider object using the setCredentials() method. You can create its object by instantiating the BasicCredentialsProvider class, the default implementation of this interface.ĬredentialsProvider credentialsPovider = new BasicCredentialsProvider() The CredentialsProvider Interface maintains a collection to hold the user login credentials. Step 1 - Create a CredentialsProvider object This chapter explains, how to execute a client request against a site that asks for username and password. Using HttpClient, you can connect to a website which needed username and password. ![]()
0 Comments
Leave a Reply. |