如何模拟HttpServletRequest和HttpServletResponse对象？

我有一个简单的servlet。他转发到jsp页面。但是当我在我的测试中使用模拟对象HttpServletRequest和HttpServletResponse代替原始对象时，我得到NullPointerException。如何模拟HttpServletRequest和HttpServletResponse对象？

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.) 
    } 
}

这是我的测试，创建HttpServletRequest和HttpServletResponse对象，并送他们到doPost方法：

@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); 

}

这是我的日志行文后：

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)

什么原因？帮我解决这个问题。谢谢。

来源

2017-06-20 Pavel

因为你嘲笑的要求，你需要提供'的getRequestDispatcher（）'。默认情况下它返回NULL。除非您配置了返回值，否则默认模拟的 –

返回'null'。这意味着当调用方法'getRequestDispatcher（）'时，你需要配置'HttpServletRequest'mock返回一些东西。 –

是的！谢谢！是工作！ – Pavel

模拟req.getRequestDispatcher("WEB-INF/views/AdminMenu.jsp")的呼叫以避免NullPointerException。

来源

2017-06-20 12:07:46

您需要添加以下

RequestDispatcher rd = mock(RequestDispatcher.class); 
when(req.getRequestDispatcher(eq("WEB-INF/views/AdminMenu.jsp"))).thenReturn(rd);

来源

2017-06-20 16:27:16 want2learn

如何模拟HttpServletRequest和HttpServletResponse对象？

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