![]() ![]() As mentioned, these examples are heavily based on the Apache HttpClient samples, and I recommend looking at that code for more examples. I hope these examples of creating Java REST (RESTful) clients using the Apache HttpClient have been helpful. Java REST clients using the Apache HttpClient library HttpClient.getConnectionManager().shutdown() ![]() Header headers = httpResponse.getAllHeaders() įor (int i = 0 i < headers.length i++) HttpEntity entity = httpResponse.getEntity() HttpResponse httpResponse = httpclient.execute(target, getRequest) HttpGet getRequest = new HttpGet("/forecastrss?p=80020&u=f") HttpHost target = new HttpHost("", 80, "http") * Try this Twitter API URL for another example (it returns JSON results):ĭefaultHttpClient httpclient = new DefaultHttpClient() * 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. Here, connections are pooled on a per-route basis. Hopefully you can try this against different URLs where you can examine the header information in more detail. HttpClient Configuration In HttpClientConfig class, we are configuring mainly two things PoolingHttpClientConnectionManager As the name suggests, it is a connection pool manager. 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 .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. If response code is 300 or greater, exception is thrown. Basic POST First, let's go over a simple example and send a POST request using HttpClient. To create a custom HttpClient response handler, we need to implement HttpClientResponseHandler and override its handleResponse method.īasicHttpClientResponseHandler for String BasicHttpClientResponseHandler returns the response body as string for successful responses. Apache HttpClient with SSL Example of how to configure the HttpClient with SSL. HttpClientResponseHandler is an interface and declares handleResponse method. Apache provides following implementations of HttpClientResponseHandler.īasicHttpClientResponseHandler: It returns the response body as string for successful responses.ĬontentResponseHandler: It converts response as Content instances. HttpEntity is an auto closable entity that can be sent or received with HTTP message. } HttpClientResponseHandler HttpClientResponseHandler handles the process of generating response object from ClassicHttpResponse which encloses HttpEntity. Compile '5:httpclient5:5.0-beta1'Ĭompile '5:httpclient5-fluent:5.0-beta1'Ĭompile ':jackson-core:2.9.5'Ĭompile ':jackson-databind:2.9.5'Ĭompile ':jackson-annotations:2.9.5' As a first HTTP client example, were using Javas own HttpClient. ![]()
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