注入HttpClient以使用GUICE在Java中获取模拟响应

Question

    String strTemp = "";
        String sessionToken = "" ;
        HttpResponse response;

        try {
            String url = String.format(URL_SESSION, email);
            HttpGet request = new HttpGet(url);
            <b>response = client.execute(request);</b>
        } catch (Throwable e) {
            LOG.error("Could not reach to the Server");
            throw new ExecutionException(e, "Could not reach to the Server")
                    .withReason(Throwables.getRootCause(e).getMessage())
                    .withResolution("Check if the outbound Port is open and you can reach the     Rapportive service");
        }

public abstract class MockHttpRequestBadQuery implements HttpClient {

    protected HttpResponse execute(HttpGet httpUriRequest) throws IOException {
        HttpResponse httpResponse = new BasicHttpResponse(new StatusLine() {
            @Override
            public ProtocolVersion getProtocolVersion() {
                return new ProtocolVersion("HTTP/1.1", 0, 0);
            }

            @Override
            public int getStatusCode() {
                return 400;
            }

            @Override
            public String getReasonPhrase() {
                return "Bad Request";
            }
        });
        HttpEntity entity = new StringEntity("{\"message\":\"\\n" +
                "SELECT badFieldName FROM Account\\n" +
                "       ^\\n" +
                "ERROR at Row:1:Column:8\\n" +
                "No such column \'badFieldName\' on entity \'Account\'. If you are attempting to use" +
                " a custom field, be sure to append the \'__c\' after the custom field name. Please" +
                " reference your WSDL or the describe call for the appropriate names.\"," +
                " \"errorCode\":\"INVALID_FIELD\"}");
        httpResponse.setEntity(entity);
        httpResponse.setHeader("Content-Type", "application/json;charset=UTF-8");
        httpResponse.setHeader("Date", "Tue, 28 May 2013 16:06:21 GMT");
        httpResponse.setHeader("Transfer-Encoding", "chunked");
        return httpResponse;
    }
}

Answer 1

从您发布的代码中并不清楚真正的HttpClient依赖项是如何添加到真正的类中的。但以下是您可以在实际场景和测试场景中执行此操作的方法：

public class RealClassThatNeedsClientDep {

    @Inject private HttpClient client;

    public method useClient() {
        client.doStuff(); // client was injected at instance creation by Guice
    }

    public static void main(String[] args) {
        Injector injector = Guice.createInjector(new RealModule());
        injector.getInstance(RealClassThatNeedsClientDep.class).useClient();
    }
}

类有一个客户端作为注入的实例变量。如果该客户端类有一个默认的无参数构造函数，那么这就是您需要做的全部工作。如果没有，或者您希望将自定义逻辑应用于注入的客户机，那么您可以在realmodule中使用提供程序绑定客户机。注我不知道您使用的是哪种httpclient，所以下面的方法很可能是假的。

public class RealModule {
    /** provider only needed if HttpClient has no default no-args public constructor */
    @Provides HttpClient getClient() {
        return HttpClient.getNewInstance().customize();
    }
}

在您的测试模块中，您可以绑定一个用于注入的模拟客户端，并将测试模块安装到测试类中。

public class TestModule {

    @Provides HttpClient getClient() {
        // define mock client using Mockito or roll your own
    }
}