Java 如何在mockito中模拟servlet上下文

我正在为servlet编写测试用例。在测试中，我无法使用mockito将servlet上下文变量传递给servlet。我试过了，但在servlet中它给出了空指针异常。下面我提供代码和测试代码：

代码是：

public class httpt_vb_getTableNames extends HttpServlet implements SingleThreadModel {

    int userId;
    String userName;
    String userPassword;

    public void service (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println( "came to httpt_vb_getTableNames servlet");
        response.setContentType( "text/plain");
        ServletContext sc = getServletContext();
        ServletOutputStream servletOut = response.getOutputStream ();
}

public class http_vb_getTableNamesServletTest {
@Mock
HttpServletRequest request;
@Mock
HttpServletResponse response;
@Mock
HttpSession session;
@Mock
RequestDispatcher rd;
@Mock
ServletOutputStream  servletOut;
@Mock
ServletContext sc;
@Mock
FilterConfig filterConfig;
public final static String Seperator = new Character((char)1).toString();
public final static String ContentDelimeter = new Character((char)2).toString();

@BeforeClass
public void setUp() throws Exception 
{
    MockitoAnnotations.initMocks(this);
    sc=mock(ServletContext.class);
}

@Test
public void test() throws Exception {
    DataSet ds=new DataSet();

    String buffer=ds.getUserId()+Seperator+ds.getUsername();
    ByteArrayOutputStream bos = new ByteArrayOutputStream ();
    ZipOutputStream out = new ZipOutputStream(bos);
    out.putNextEntry(new ZipEntry("request.txt"));
    out.write(buffer.getBytes("UTF-8"));
    out.closeEntry();
    out.close();
    bos.close();

    String b64String = Base64.encodeBase64String(bos.toByteArray());
    Reader inputString = new StringReader(b64String);
    BufferedReader reqbuffer = new BufferedReader(inputString);
    httpt_vb_getTableNames servlet=new httpt_vb_getTableNames();

    when(request.getReader()).thenReturn(reqbuffer);
    when(request.getServletContext()).thenReturn(sc);
    when(response.getOutputStream()).thenReturn(servletOut);
    when(sc.getRequestDispatcher("/jsp/admin/chooseNeighborhood.jsp")).thenReturn(rd);
    when(sc.getRequestDispatcher("/jsp/admin/joinNeighborhood.jsp")).thenReturn(rd);
    servlet.service(request, response);

    ArgumentCaptor<String> bufferCaptor = ArgumentCaptor.forClass(String.class);
    verify(servletOut).print(bufferCaptor.capture());
    String responseBody = bufferCaptor.getValue();       

    ZipInputStream zipIn = new ZipInputStream(new ByteArrayInputStream(Base64.decodeBase64(responseBody.toString().getBytes())));
    zipIn.getNextEntry();
    StringBuffer sb = new StringBuffer();
    ByteArrayOutputStream out1 = new ByteArrayOutputStream();
    IOUtils.copy(zipIn, out1);
    sb = new StringBuffer();
    sb.append(out1.toString("UTF-8"));

    String[] res=sb.toString().split(Seperator);        
    AssertJUnit.assertEquals("Success",res[0]);
}

测试代码为：

public class http_vb_getTableNamesServletTest {
@Mock
HttpServletRequest request;
@Mock
HttpServletResponse response;
@Mock
HttpSession session;
@Mock
RequestDispatcher rd;
@Mock
ServletOutputStream  servletOut;
@Mock
ServletContext sc;
@Mock
FilterConfig filterConfig;
public final static String Seperator = new Character((char)1).toString();
public final static String ContentDelimeter = new Character((char)2).toString();

@BeforeClass
public void setUp() throws Exception 
{
    MockitoAnnotations.initMocks(this);
    sc=mock(ServletContext.class);
}

@Test
public void test() throws Exception {
    DataSet ds=new DataSet();

    String buffer=ds.getUserId()+Seperator+ds.getUsername();
    ByteArrayOutputStream bos = new ByteArrayOutputStream ();
    ZipOutputStream out = new ZipOutputStream(bos);
    out.putNextEntry(new ZipEntry("request.txt"));
    out.write(buffer.getBytes("UTF-8"));
    out.closeEntry();
    out.close();
    bos.close();

    String b64String = Base64.encodeBase64String(bos.toByteArray());
    Reader inputString = new StringReader(b64String);
    BufferedReader reqbuffer = new BufferedReader(inputString);
    httpt_vb_getTableNames servlet=new httpt_vb_getTableNames();

    when(request.getReader()).thenReturn(reqbuffer);
    when(request.getServletContext()).thenReturn(sc);
    when(response.getOutputStream()).thenReturn(servletOut);
    when(sc.getRequestDispatcher("/jsp/admin/chooseNeighborhood.jsp")).thenReturn(rd);
    when(sc.getRequestDispatcher("/jsp/admin/joinNeighborhood.jsp")).thenReturn(rd);
    servlet.service(request, response);

    ArgumentCaptor<String> bufferCaptor = ArgumentCaptor.forClass(String.class);
    verify(servletOut).print(bufferCaptor.capture());
    String responseBody = bufferCaptor.getValue();       

    ZipInputStream zipIn = new ZipInputStream(new ByteArrayInputStream(Base64.decodeBase64(responseBody.toString().getBytes())));
    zipIn.getNextEntry();
    StringBuffer sb = new StringBuffer();
    ByteArrayOutputStream out1 = new ByteArrayOutputStream();
    IOUtils.copy(zipIn, out1);
    sb = new StringBuffer();
    sb.append(out1.toString("UTF-8"));

    String[] res=sb.toString().split(Seperator);        
    AssertJUnit.assertEquals("Success",res[0]);
}

公共类http\u vb\u getTableNamesServletTest{
@嘲弄
HttpServletRequest请求；
@嘲弄
HttpServletResponse；
@嘲弄
http会议；
@嘲弄
请求调度程序rd；
@嘲弄
ServletOutputStreamServletOut；
@嘲弄
ServletContext sc；
@嘲弄
过滤器配置过滤器配置；
公共最终静态字符串分隔符=新字符（（char）1）.toString（）；
public final静态字符串ContentDelimeter=新字符（（char）2）.toString（）；
@课前
public void setUp（）引发异常
{
initMocks（this）；
sc=mock（ServletContext.class）；
}
@试验
public void test（）引发异常{
数据集ds=新数据集（）；
字符串缓冲区=ds.getUserId（）+分隔符+ds.getUsername（）；
ByteArrayOutputStream bos=新的ByteArrayOutputStream（）；
ZipOutputStream out=新的ZipOutputStream（bos）；
out.putNextEntry（newzipentry（“request.txt”）；
out.write（buffer.getBytes（“UTF-8”）；
out.closeEntry（）；
out.close（）；
bos.close（）；
字符串b64String=Base64.encodeBase64String（bos.toByteArray（））；
Reader inputString=新的StringReader（b64String）；
BufferedReader reqbuffer=新的BufferedReader（inputString）；
httpt_vb_getTableNames servlet=新的httpt_vb_getTableNames（）；
when（request.getReader（））.thenReturn（reqbuffer）；
当（request.getServletContext（））。然后返回（sc）；
when（response.getOutputStream（））.thenReturn（servletOut）；
当（sc.getRequestDispatcher（“/jsp/admin/chooseNeighborhood.jsp”）。然后返回（rd）；
当（sc.getRequestDispatcher（“/jsp/admin/joinNeighbory.jsp”）。然后返回（rd）；
服务（请求、响应）；
ArgumentCaptor bufferCaptor=ArgumentCaptor.forClass（String.class）；
验证（servletOut）.print（bufferCaptor.capture（））；
字符串responseBody=bufferCaptor.getValue（）；
ZipInputStream zipIn=new ZipInputStream（new ByteArrayInputStream（Base64.decodeBase64（responseBody.toString（）.getBytes（）））；
zipIn.getNextEntry（）；
StringBuffer sb=新的StringBuffer（）；
ByteArrayOutputStream out1=新建ByteArrayOutputStream（）；
IOUtils.副本（zipIn，out1）；
sb=新的StringBuffer（）；
sb.追加（输出1.toString（“UTF-8”）；
字符串[]res=sb.toString（）.split（分隔符）；
AssertJUnit.assertEquals（“Success”，res[0]）；
}

}

有人能建议我如何在mocktio中模拟servlet上下文吗？

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提前感谢

可能重复上述行ServletContext sc=getServletContext（）的代码中的NullPointerException？的确切位置@Oleg Skylar我在servlet上下文中尝试了这个答案，但它不起作用。您是否尝试调用

servlet.init（sc）

？