Apache HttpClient - 获取状态码

1. Overview

In this very quick tutorial, I will show how to get and validate the StatusCode of the HTTP Response using HttpClient.

If you want to dig deeper and learn other cool things you can do with the HttpClient – head on over to the main HttpClient tutorial.

2. Retrieve the Status Code from the Http Response

After sending the Http request – we get back an instance of org.apache.hc.client5.http.impl.classic.ClosableHttpResponse – which allows us to access directly the Status Code:

response.getCode()

Using this, we can validate that the code we receive from the server is indeed correct:

@Test
public final void givenGetRequestExecuted_whenAnalyzingTheResponse_thenCorrectStatusCode() throws IOException {
    final HttpGet request = new HttpGet(SAMPLE_URL);
    try (CloseableHttpClient client = HttpClientBuilder.create().build();

        CloseableHttpResponse response = (CloseableHttpResponse) client
            .execute(request, new CustomHttpClientResponseHandler())) {

        assertThat(response.getCode(), equalTo(HttpStatus.SC_OK));
    }
}

Notice that we’re using the predefined Status Codes also available in the library via org.apache.hc.core5.http.HttpStatus.

3. Conclusion

This very simple example shows how to retrieve and work with Status Codes with the Apache HttpClient.

The implementation of all these examples and code snippets can be found in my github project – this is an Eclipse based project, so it should be easy to import and run as it is.