[英]How to mock HttpServletRequest and HttpServletResponse objects?
I have a simple servlet. 我有一个简单的servlet。 He forward to
jsp
page. 他转发到
jsp
页面。 But when I use mock objects for HttpServletRequest
and HttpServletResponse
instead original objects in my test, I get NullPointerException
. 但是,当我在测试中将模拟对象用于
HttpServletRequest
和HttpServletResponse
而不是原始对象时,就会得到NullPointerException
。
public class SimpleServlet extends HttpServlet {
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.getRequestDispatcher("WEB-INF/views/AdminMenu.jsp")
.forward(req, resp); // In this place I get NPE (16th string.)
}
}
This is my test which create HttpServletRequest
and HttpServletResponse
objects and send their into doPost
method: 这是我的测试,该测试创建
HttpServletRequest
和HttpServletResponse
对象并将其发送到doPost
方法中:
@Test
public void test() throws ServletException, IOException {
final HttpServletRequest req = mock(HttpServletRequest.class);
final HttpServletResponse resp = mock(HttpServletResponse.class);
final SimpleServlet simpleServlet = new SimpleServlet();
simpleServlet.doPost(req, resp);
}
This is my log after running text: 这是我运行文本后的日志:
java.lang.NullPointerException
at ru.pravvich.servlets.SimpleServlet.doPost(SimpleServlet.java:16)
at ru.pravvich.servlets.SimpleServletTest.test(SimpleServletTest.java:28)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:117)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:42)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:262)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:84)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:147)
What reason? 什么理由? Help me fix this issue.
帮助我解决此问题。 Thank You.
谢谢。
模拟req.getRequestDispatcher("WEB-INF/views/AdminMenu.jsp")
的调用以避免NullPointerException
。
You need to add following 您需要添加以下内容
RequestDispatcher rd = mock(RequestDispatcher.class);
when(req.getRequestDispatcher(eq("WEB-INF/views/AdminMenu.jsp"))).thenReturn(rd);
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