Can we consume get api along with request body in java 8?

Java
1

can we consume get api along with request body in java 8?

2

Yes we can call GET API with Request Body and Headers in Java and Spring Boot

  1. Using Spring Boot Rest Template:

RestTemplate doesn’t support Http Get request with a Request Body because it not implement HttpEntityEnclosingRequestBase by default. But we can make.

a)

import org.apache.http.client.methods.HttpUriRequest;
import org.springframework.http.HttpMethod;
import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;

import java.net.URI;
public final class CustomHttpComponentsClientHttpRequestFactory extends HttpComponentsClientHttpRequestFactory {

    @Override
    protected HttpUriRequest createHttpUriRequest(HttpMethod httpMethod, URI uri) {

        if (HttpMethod.GET.equals(httpMethod)) {
            return new HttpGetPost(uri);
        }
        return super.createHttpUriRequest(httpMethod, uri);
    }
}

b)

import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.springframework.http.HttpMethod;

import java.net.URI;

public final class HttpGetPost extends HttpEntityEnclosingRequestBase {

    public HttpGetPost(final URI uri) {
        super.setURI(uri);
    }

    @Override
    public String getMethod() {
        return HttpMethod.GET.name();
    }
}

c)

import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.http.*;
import org.springframework.web.client.RestTemplate;

public class RestTemplateGetWithBody {
    static String url = "http://localhost:8088/rest-template/get-with-body";

    public static void main(String[] args) {
        call();
    }

    public static void call() {
        RestTemplate restTemplate = new RestTemplateBuilder().build();
        restTemplate.setRequestFactory(new CustomHttpComponentsClientHttpRequestFactory()); // set our custom Request Factory
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_JSON); // Please set the proper content type here otherwise it will throw error
        HttpEntity<Object> entity = new HttpEntity<>("{\"id\":\"1234\"}", headers);
        try {
            ResponseEntity<Object> responseEntity = restTemplate.exchange(url, HttpMethod.GET, entity, Object.class);
            System.out.println(responseEntity);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
  1. Using Apache HttpClient

import org.apache.http.HttpEntity;
import org.apache.http.HttpHeaders;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpUriRequest;
import org.apache.http.client.methods.RequestBuilder;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.util.EntityUtils;

public class HttpClientGetBody {
    public static void call() throws Exception {

        try (CloseableHttpClient httpClient = HttpClientBuilder.create().build()) {
            StringEntity input = new StringEntity("{\"qty\":100,\"name\":\"iPad 4\"}");
            //input.setContentType("application/json");
            HttpUriRequest request = RequestBuilder.get("http://localhost:8088/rest-template/get-with-body")
                    .setEntity(input)
                    .setHeader(HttpHeaders.CONTENT_TYPE, "application/json")
                    .build();
            HttpResponse response = httpClient.execute(request);
            //verify the valid error code first
            int statusCode = response.getStatusLine().getStatusCode();
            if (statusCode != 200) {
                throw new RuntimeException("Failed with HTTP error code : " + statusCode);
            }

            //Now pull back the response object
            HttpEntity httpEntity = response.getEntity();
            String apiOutput = EntityUtils.toString(httpEntity);
            System.out.println(apiOutput);
        }
    }

}
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3

below is another solution with httpclient


public static String get(String url) throws IOException, ParseException {
		String resultContent = null;
		HttpGet httpGet = new HttpGet(url);
		CloseableHttpClient httpclient = HttpClients.createDefault();
		httpGet.addHeader("content-type", "application/json");
		Map<String, Object> leadRequest = new HashMap<>();
		leadRequest.put("funding_loan_no","1234");
		ObjectMapper objectMapper = new ObjectMapper();
		String request = objectMapper.writeValueAsString(leadRequest);
		httpGet.setEntity(new StringEntity(request));
		CloseableHttpResponse response = httpclient.execute(httpGet);
		// Get status code
		System.out.println(response.getVersion()); // HTTP/1.1
		System.out.println(response.getCode()); // 200
		System.out.println(response.getReasonPhrase()); // OK
		org.apache.hc.core5.http.HttpEntity entity = response.getEntity();
		// Get response information
		resultContent = EntityUtils.toString(entity);

		return resultContent;
	}
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4

@hariom.chaudhary But there in no such method (setEntity) in HttpGet class in v4.0


httpGet.setEntity(new StringEntity(request));
5

@naveen.gupta we need to use http client version 5.x for this

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