[FIXED] How to perform an http request to another server from spring boot controller

Issue

i want to perform a get request on a server hosted on localhost:80 (for example but could be every host) from my spring boot application hosted on localhost:8080.

For example i want to get an image hosted on locahost:80/image.jpg from my spring application. How can i handle this?

Solution

You can use RestTemplate for that.

        RestTemplate restTemplate = new RestTemplate();

        String uri = localhost:80; // or any other uri

        HttpHeaders headers = new HttpHeaders();
        headers.setAccept(Collections.singletonList(MediaType.APPLICATION_JSON));
        headers.add("user-agent", "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36");

        HttpEntity<String> entity = new HttpEntity<>("parameters", headers);
        ResponseEntity<?> result =
                restTemplate.exchange(uri, HttpMethod.GET, entity, returnClass);
        return result.getBody();

If you want to get images then use following method:

String url = "http://img.championat.com/news/big/l/c/ujejn-runi_1439911080563855663.jpg";
byte[] imageBytes = restTemplate.getForObject(url, byte[].class);
Files.write(Paths.get("image.jpg"), imageBytes);

You will also need to configure ByteArrayHttpMessageConverter in application config:

@Bean
public RestTemplate restTemplate(List<HttpMessageConverter<?>> messageConverters) {
    return new RestTemplate(messageConverters);
}

@Bean
public ByteArrayHttpMessageConverter byteArrayHttpMessageConverter() {
    return new ByteArrayHttpMessageConverter();
}

Answered By - Drashti Dobariya
Answer Checked By - David Goodson (JavaFixing Volunteer)