Retrieving JSON data via HTTP POST using Spring Android Framework

Question

I am using spring android framework for retrieving json data via Http POST. But while consuming the service, at server side the parameter are received null.

Following is the android code :

protected String doInBackground(String... params) {
String username = params[0];

String password = params[1];

String url = connectServices.connectLoginServiceURL();// returns url

loginServiceParam = new LinkedMultiValueMap<String, String>();
loginServiceParam.add("username", username);
loginServiceParam.add("password", password); //username and password are null at server end.

HttpHeaders requestHeaders = new HttpHeaders();

requestHeaders.setAccept(Collections.singletonList(new MediaType("application", "json")));
requestHeaders.setContentType(MediaType.APPLICATION_JSON);

HttpEntity<MultiValueMap<String, String>> requestEntity = new HttpEntity<MultiValueMap<String, String>>(loginServiceParam, requestHeaders);

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

// Add the Gson message converters
restTemplate.getMessageConverters().add(new GsonHttpMessageConverter());
restTemplate.getMessageConverters().add(new StringHttpMessageConverter());

// Make the HTTP POST request, marshaling the response from JSON

ResponseEntity<LoginBean> responseEntity = restTemplate.exchange(url, HttpMethod.POST, requestEntity, LoginBean.class);

LoginBean loginBeanResponse = responseEntity.getBody();

status = loginBeanResponse.getStatus();

return status;
}

LoginBean class is following :

public class LoginBean {

    private String status;

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }
}

The json response is :

{"status":"true"}

Thanks!

Arpit Jain · Accepted Answer · 2013-02-21 07:35:02Z

2

I myself resolved this query. Following code needs to be put

RestTemplate restTemplate = new RestTemplate(true);

True is required for POST request. By default it is false and that is for GET request. This is not mentioned even on Spring Android Reference link

answered Feb 21, 2013 at 7:35

Arpit Jain

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2 Comments

Roy Clarkson Over a year ago

Arpit, this is incorrect. The true parameter has nothing to do with POST or GET requests. Passing true to a new RestTemplate instance indicates to add a set of default message converters. See the Reference doc here: static.springsource.org/spring-android/docs/1.0.x/reference/… Also the API doc: static.springsource.org/spring-android/docs/1.0.x/api/org/…

Arpit Jain Over a year ago

Roy, thanks for the information. I was able to process POST only if true is passed to the RestTemplate. Without that I was encountered following exception :

org.springframework.web.client.RestClientException: Could not write request: no suitable HttpMessageConverter found for request type [org.springframework.util.LinkedMultiValueMap]

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