httpclient访问restful

转：http://howtodoinjava.com/2013/05/21/jax-rs-restful-client-using-apache-httpclient/

 

JAX-RS RESTful client using apache httpclient

 

public static void demoPostRESTAPI()  throws Exception
{
    DefaultHttpClient httpClient =  new DefaultHttpClient();

    User user =  new User();
    user.setId( 100 );
    user.setFirstName( "Lokesh" );
    user.setLastName( "Gupta" );

    StringWriter writer =  new StringWriter();
    JAXBContext jaxbContext = JAXBContext.newInstance(User. class );
    Marshaller jaxbMarshaller = jaxbContext.createMarshaller();
    jaxbMarshaller.marshal(user, writer);

    try
    {
        //Define a postRequest request
        HttpPost postRequest =  new HttpPost( "http://localhost:8080/RESTfulDemoApplication/user-management/users" );

        //Set the API media type in http content-type header
        postRequest.addHeader( "content-type" ,  "application/xml" );

        //Set the request post body
        StringEntity userEntity =  new StringEntity(writer.getBuffer().toString());
        postRequest.setEntity(userEntity);

        //Send the request; It will immediately return the response in HttpResponse object if any
        HttpResponse response = httpClient.execute(postRequest);

        //verify the valid error code first
        int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode !=  201 )
        {
            throw new RuntimeException( "Failed with HTTP error code : " + statusCode);
        }
    }
    finally
    {
        //Important: Close the connect
        httpClient.getConnectionManager().shutdown();
    }
}

就是关键的 postRequest.addHeader( "content-type" ,  "application/xml" );