how to call an external api from spring mvc controller

Question

hello my controller is

@Controller
public class HomeController{ 
@RequestMapping(value = "/inString={name}", method = RequestMethod.GET)

      public @ResponseBody String getGreeting(@PathVariable String name, String result) {

      //below is the url has given.I want to pass the name string to the below url for the input_text parameter
      //http://ipaddress/input?input_text=tell me something&target_val=hi;

       result=the_result_provided_from_the_above_URL ; 
        return result;
}
}

I am able to get the pathVariable name.Now I want to pass the name to another URL which returns a string and that string will be returned from the controller.I tried but have not been able to call an URL from the controller.

Fran Montero · Accepted Answer · 2015-07-17 09:53:40Z

1

You can call a servlet using Apache's HttpClient. This is an example:

...
private static final String SERVLETURL = "http://ipaddress/input?input_text=tell";
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet(SERVLETURL);
CloseableHttpResponse response = httpclient.execute(httpGet);
HttpEntity entity = response.getEntity();
String responseBody = getStringFromInputStream(response.getEntity().getContent());
//Processing here
EntityUtils.consume(entity);
...

answered Jul 17, 2015 at 9:53

Fran Montero

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3 Comments

Mithun Debnath Over a year ago

sir what package do I need to import as It is giving me error and asking me to create class for CloseableHttpClient and HttpGet and for others...

Fran Montero Over a year ago

You need apache httpclient and httpcore for covering my full example. This is the maven repository where you cand find pom reference and download the jars manually. mvnrepository.com/artifact/org.apache.httpcomponents

Fran Montero Over a year ago

You can try with JRE API instead of using external libraries. stackoverflow.com/questions/4349854/…

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