RestTemplate, the option to publish REST web services and many other web-related things. As explained earlier, RestTemplate uses the class java.net.HttpURLConnection as the HTTP client by default. The data received is in XML format or JSON format. Make sure to have spring-boot-starter-test dependency in the project to enable loading of spring text context, bean initialization and dependency management. Spring Boot API RestTemplate GETPOST API RestTemplate RestTemplate . . Synchronous client to perform HTTP requests, exposing a simple, template method API over underlying HTTP client libraries such as the JDK HttpURLConnection, Apache HttpComponents, and others. However, we can switch to a different HTTP client library like Apache HttpComponents, Netty, OkHttp, etc. 4.1. ResponseEntity<String> response = this.restTemplate.exchange (your_URL, HttpMethod.POST, your-REQUEST, class_type.class); As you can see i the above code we are making use of exchange method here, but it takes many parameters as the input here. Here is an example for exchange() method parameterized with RequestEntity and TypeRef. In this Spring Boot RestTemplate POST request test example, we will create a POST API and then test it by sending request body along with request headers using postForEntity() method.. 1. Write Java clients for services that use the Spring RestTemplate or use Angular JS to access your services. Let's have a look at how to do a POST with the more generic exchange API: . The content type of the request need to be APPLICATION_FORM_URLENCODED or. We can also pass the headers inside it, to validate the URL at other side. This page will walk through Spring RestTemplate.exchange () method example. exchange() method accepts the URL, HTTP method to invoke, the entity to be updated and the class type of entity. . Lombok generates e.g. For this, exchange() method of RestTemplate may be used. Examples at hotexamples.com: 30 Frequently Used Methods Show Example #1 1 Show file File: UserService.java Project: rversteegt/fontys-ktv public static List<User> all () { login (); return Arrays.asList ( template .exchange (endpoint, HttpMethod.GET, new HttpEntity<> (null, credentials ()), User [].class) .getBody ()); } Example #2 0 It makes it easy to invoke REST endpoints in a single line. Implement Services that provide Json or XML responses and services that receive Json or XML payloads. 2.2 POJO Class Employee Our POJO class, which will accompany us through the example, looks like this: @Data The exchange method can be used for HTTP DELETE, GET, HEAD, OPTIONS, PATCH, POST, PUT, TRACE methods. For the API side of all examples, we'll be running the RESTful service from here. Posting JSON With postForObject RestTemplate 's postForObject method creates a new resource by posting an object to the given URI template. The RestTemplate offers templates for common scenarios by HTTP method, in addition to the generalized exchange and execute methods that support of less frequent cases. getForEntity - Retrieves a ResponseEntity (that is, status, headers, and body) by using GET. exchange() returns an object of ResponseEntity which contains the response returned by the server in its body as well as the response code and response headers. If you take a closer look at how FormHttpMessageConverter works, it's apparent that it was meant to work with MultiValueMap 's only. RestTemplate methods Let's list out useful RestTemplate APIs: getForObject - Retrieves a representation via GET. Here, we set the Content-Type header to application/json by calling the setContentType method. The payload of the HTTP request must be a MultiValueMap . ResponseEntity<Foo> response = restTemplate .exchange(fooResourceUrl, HttpMethod.POST, request, Foo.class); Assertions.assertEquals(response.getStatusCode(), HttpStatus.CREATED); . As explained earlier, RestTemplate uses the class java.net.HttpURLConnection as the HTTP client by default. RestTemplate Exchange Post Example. Spring Boot 2.x. In order to be able to POST form data we need to ensure two important points. . Maven dependencies. 15 Answers Sorted by: 648 To easily manipulate URLs / path / params / etc., you can use Spring's UriComponentsBuilder class to create a URL template with placehoders for the parameters, then provide the value for those parameters in the RestOperations.exchange (.) call. Getter and Setter and helps us to avoid repeating code. RestTemplate. By AmarSivas | Created :2021-10-15 | Updated : 2021-10-16 | Viewed : 1645 times . Request Parameters Provide Request Parameters to Spring RestControllers and understand the key concept of Content Negotiation. The simplest form of RestTemplate is created as a new instance of the class with an empty constructor as seen in the examples so far. The exchange method executes the request of any HTTP method and returns ResponseEntity instance. Spring RestTemplate - HTTP POST Example Available methods for consuming POST APIs are: postForObject (url, request, classType) - POSTs the given object to the URL, and returns the representation found in the response as given class type. Example, As HTTP client API we use Apache HttpComponents for the following examples. The simplest form of RestTemplate is created as a new instance of the class with an empty constructor as seen in the examples so far. The RestTemplate provides a higher level API over HTTP client libraries. Eclipse 3.7. We'll attach the headers object to our requests. However, we can switch to a different HTTP client library like Apache HttpComponents, Netty, OkHttp, etc. Now we use the exchange() method with parameters like RequestEntity and ParameterizedTypeReference. In this post, I will guide you for creating a Restful Client application using Spring Boot with the 4 functions: Create a request with GET method, and send it to Restful Web Service to receive a list of employees, or an employment's information. Posting 6:24