Java 带Servlet请求的Mockito单元测试的过滤器链

我使用Mockito测试过滤器，我尝试测试需要HTTPServlet请求作为参数的过滤器链方法，我尝试模拟Servlet请求和HTTPServlet请求，但我收到了 错误， 将HTTPServlet请求用作空指针异常时，&with 无法强制转换Servlet请求。任何线索都是感激的

我的过滤器看起来像

public class CheckerFilter implements Filter {
private final UserDetails userDetails;
priate final UserAuthentication userAuthentication

public CheckerFilter(UserDetails userDetails,UserAuthentication userAuthentication ){
this.userDetails = userDetails;
this.userAuthentication = userAuthentication;
} 

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)throws IOException, ServletException{
        final HttpServletRequest request = (HttpServletRequest)req;
        final String method = request.getMethod();
        final String contentType = request.getContentType();
        boolean result = evaluate();
        ....

        if(result)filter.doChain(request, res, chain);
        else res.sendRedirect('\XXX');
}
}

public class CheckerFilterTest {

@InjectMocks private CheckerFilter checkerFilter;
final UserDetails userDetails =mock(UserDetails.class);
final UserAuthentication userAuthentication = mock (UserAuthentication.class);

  @Mock  ServletRequest mockServeletRequest;
  @Mock  ServletResponse mockResponse;
  @Mock HTTPServeltRequest mockHttprequest;

public void setUp (){
checkerFilter = new CheckerFilter(userDetails, userAuthentication);
}
@Test
public void Evaluate_returnsTrue(){

when(evaluate()).thenReturn(true);
checkerFilter.doFilter(mockHTTPrequest, mockResponse, mockchain);
//Error denoting mockHTTPRequest as null pointer exception.

//checkerFilter.doFilter(mockServletrequest, mockResponse, mockchain);Error mentioning Servlet Request cannot be cast to HTTPServlet Request.
}
}

测试看起来像

public class CheckerFilter implements Filter {
private final UserDetails userDetails;
priate final UserAuthentication userAuthentication

public CheckerFilter(UserDetails userDetails,UserAuthentication userAuthentication ){
this.userDetails = userDetails;
this.userAuthentication = userAuthentication;
} 

public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)throws IOException, ServletException{
        final HttpServletRequest request = (HttpServletRequest)req;
        final String method = request.getMethod();
        final String contentType = request.getContentType();
        boolean result = evaluate();
        ....

        if(result)filter.doChain(request, res, chain);
        else res.sendRedirect('\XXX');
}
}

public class CheckerFilterTest {

@InjectMocks private CheckerFilter checkerFilter;
final UserDetails userDetails =mock(UserDetails.class);
final UserAuthentication userAuthentication = mock (UserAuthentication.class);

  @Mock  ServletRequest mockServeletRequest;
  @Mock  ServletResponse mockResponse;
  @Mock HTTPServeltRequest mockHttprequest;

public void setUp (){
checkerFilter = new CheckerFilter(userDetails, userAuthentication);
}
@Test
public void Evaluate_returnsTrue(){

when(evaluate()).thenReturn(true);
checkerFilter.doFilter(mockHTTPrequest, mockResponse, mockchain);
//Error denoting mockHTTPRequest as null pointer exception.

//checkerFilter.doFilter(mockServletrequest, mockResponse, mockchain);Error mentioning Servlet Request cannot be cast to HTTPServlet Request.
}
}

---

模拟需要初始化。您可以在setup（）方法中使用MockitoAnnotations.initMocks（this）来初始化@Mock annotated Mock。另外，您必须使用http servlet请求模拟，而不是servlet请求模拟，因为它不能在public void setUp（）之前降级

>{MockitoAnnotations.initMocks（this）；checkerFilter=new checkerFilter（userDetails，userAuthentication）；}

您会这样引用吗？感谢在安装程序中添加initmock之后，以及使用mockServletRequest

checkerFilter.doFilter（mockServletRequest、mockResponse、mockchain）应该可以工作的人我收到的
org.mockito.codegen.ServletRequest无法转换为javax.servlet.http.HttpServletRequest
。是否有任何解决强制转换问题的方法？使用HTTPServletRequest并模拟getMethod（）的适当返回值，getContentType解决了空指针异常。