Spring HTTP Client

Question

I am new to Spring and I need my Java app to connect to another API over HTTP (JSON, RESTful). Does the Spring Framework have anything like a JSON HTTP Rest Client? What do Spri

Answer 1

i did it in following way :

import java.io.FileReader;
import java.util.HashMap;
import java.util.Map;

import org.json.simple.JSONObject;
import org.json.simple.parser.JSONParser;
import org.springframework.http.HttpEntity;
import org.springframework.http.ResponseEntity;
import org.springframework.http.converter.StringHttpMessageConverter;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;

public class PostRequestMain {

    /**
     * POST with Headers call using Spring RestTemplate
     * 
     * 
     * @param args
     */

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        MultiValueMap headers = new LinkedMultiValueMap();
        Map map = new HashMap();
        map.put("Content-Type", "application/json");
        headers.setAll(map);
        Map req_payload = new HashMap();
        req_payload.put("name", "piyush");

        HttpEntity request = new HttpEntity<>(req_payload, headers);
        String url = "http://localhost:8080/portal-name/module-name/";

        // Create a new RestTemplate instance
        RestTemplate restTemplate = new RestTemplate();

        // Add the String message converter
        restTemplate.getMessageConverters().add(new StringHttpMessageConverter());


        ResponseEntity response = restTemplate.postForEntity(url, request, String.class);


        System.out.println(response);

    }

    private static void getPayloadMap() {
        JSONParser parser = new JSONParser();

        try {

            Object obj = parser.parse(new FileReader("C:\\Piyush\\test.json"));
            JSONObject jsonObject = (JSONObject) obj;

            Map payLoadMap = new HashMap();
            payLoadMap.putAll(jsonObject);

            System.out.println(jsonObject);
        } catch (Exception e) {
        }
    }

}