我HttpsURLConnection基于StackExchange答案创建了一个模拟：
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
...
@RunWith(PowerMockRunner.class)
public class DialogTest {
public void mockHttpsUrlConnectionExample() throws Exception
{
URL mockUrl = PowerMockito.mock(URL.class);
PowerMockito.whenNew(URL.class).withAnyArguments().thenReturn(mockUrl);
HttpsURLConnection mockUrlConnection = PowerMockito.mock(HttpsURLConnection.class);
PowerMockito.when(mockUrl.openConnection()).thenReturn(mockUrlConnection);
PowerMockito.when(mockUrlConnection.getResponseCode()).thenReturn(200);
// Create and call my objects ...
}
}
但是，当我使用它时，我看到一个强制转换异常：
java.lang.ClassCastException: sun.net.www.protocol.https.HttpsURLConnectionImpl cannot be cast to javax.net.ssl.HttpsURLConnection
问题出在以下代码中：
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
...
private Boolean sendRequest(String endpoint, JSONObject requestData, Boolean throwOnAuthException) throws JSONException, IOException {
this.responseData = null;
try {
String serviceURI = getServiceURI();
String dialogUri = String.format("%s%s", serviceURI, endpoint);
URL url = new URL(dialogUri);
// Exception source is this cast
HttpsURLConnection urlConnection = (HttpsURLConnection) url.openConnection();
但是，当我查看源代码时，会看到该sun.net.www.protocol.https.HttpsURLConnectionImpl实现javax.net.ssl.HttpsURLConnection
关于如何解决这个问题有什么建议吗？
常规类加载器和PowerMock的加载器之间存在冲突
PowerMock的缺点是使用自定义类加载器。该类加载器可以以与默认类加载器不兼容的方式修改类型签名。
在某些情况下，通过反射实例化将导致使用默认的类加载器来加载类型。由于使用了不同的签名，该类加载器将不知道PowerMock已经加载了类型。结果可能是应实现转换类型的对象的转换错误。
为避免此问题，请先停止加载PowerMock javax.net.ssl.HttpsURLConnection
为了防止强制转换异常，请确保javax.net.ssl.HttpsURLConnection仅由一个类加载器加载。由于无法停止使用常规类加载器，因此最好的方法是使PowerMock加载器停止使用@PowerMockIgnore注释。例如
@PowerMockIgnore({"javax.net.ssl.*"})
@PrepareForTest(android.util.Log.class)
public class DialogTest {
...
副作用是PowerMock不再能够提供它的版本 HttpsURLConnection
接下来，公开HttpsURLConnection构造，并替换一个模拟对象
介绍HttpsURLConnection的工厂。例如
public class HttpsUrlConnectionProvider {
public HttpsURLConnection getHttpsURLConnection(String dialogUri) throws IOException {
URL url = new URL(dialogUri);
return (HttpsURLConnection) url.openConnection();
}
}
创建用于HTTP请求Eg的HttpsURLConnection对象的模拟
final HttpsURLConnection mockUrlConnection = PowerMockito.mock(HttpsURLConnection.class);
PowerMockito.when(mockUrlConnection, "getResponseCode").thenReturn(200);
PowerMockito.when(mockUrlConnection, "getOutputStream").thenReturn(outputStream);
// Replace the HttpsURLConnection factory with one that returns our mock HttpsURLConnection
HttpsUrlConnectionProvider mockConnFactory = new HttpsUrlConnectionProvider() {
public HttpsURLConnection getHttpsURLConnection(String dialogUri) throws
IOException {
return mockUrlConnection;
}
};
dialog.setHttpsUrlConnectionProvider(mockConnFactory);
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