使用junit测试springMVC的action出现java.lang.NullPointerException

qqMo123 2013-03-27 01:35:15

大神帮忙解决下啊

错误：

    java.lang.NullPointerException  

        at cn.com.qzinfo.test.base.JUnitActionBase.excuteAction(JUnitActionBase.java:68)  

        at cn.com.qzinfo.test.example.ExampleActionTest.test(ExampleActionTest.java:21)  

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  

        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)  

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)  

        at java.lang.reflect.Method.invoke(Method.java:601)  

        at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)  

        at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)  

        at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)  

        at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)  

        at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)  

        at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)  

        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:73)  

        at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:46)  

        at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:180)  

        at org.junit.runners.ParentRunner.access$000(ParentRunner.java:41)  

        at org.junit.runners.ParentRunner$1.evaluate(ParentRunner.java:173)  

        at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)  

        at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)  

        at org.junit.runners.ParentRunner.run(ParentRunner.java:220)  

        at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)  

        at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)  

        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)  

        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)  

        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)  

        at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

JUnitActionBase类：

    package cn.com.qzinfo.test.base;  

      

    import javax.servlet.http.HttpServletRequest;  

    import javax.servlet.http.HttpServletResponse;  

      

    import org.junit.BeforeClass;  

    import org.springframework.mock.web.MockServletContext;  

    import org.springframework.web.context.WebApplicationContext;  

    import org.springframework.web.context.support.XmlWebApplicationContext;  

    import org.springframework.web.servlet.HandlerAdapter;  

    import org.springframework.web.servlet.HandlerExecutionChain;  

    import org.springframework.web.servlet.HandlerMapping;  

    import org.springframework.web.servlet.ModelAndView;  

    import org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter;  

    import org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping;  

      

    /** 

     * JUnit测试action时使用的基类 

     *  

     * @author fule 

     *  

     */  

      

    public class JUnitActionBase {  

        private static HandlerMapping handlerMapping;  

        private static HandlerAdapter handlerAdapter;  

      

        /** 

         * 读取配置文件c 

         */  

        @BeforeClass  

        public static void setUp() {  

            if (handlerMapping == null) {  

                String[] configs = { "file:src/applicationContext.xml","file:WebRoot/WEB-INF/springMVC-servlet.xml" };  

                XmlWebApplicationContext context = new XmlWebApplicationContext();  

                context.setConfigLocations(configs);  

                MockServletContext msc = new MockServletContext();  

                context.setServletContext(msc);  

                context.refresh();  

                msc  

                        .setAttribute(  

                                WebApplicationContext.ROOT_WEB_APPLICATION_CONTEXT_ATTRIBUTE,  

                                context);// TODO  

                handlerMapping = (HandlerMapping) context  

                        .getBean(DefaultAnnotationHandlerMapping.class);  

      

                handlerAdapter = (HandlerAdapter) context  

                        .getBean(context  

                                .getBeanNamesForType(AnnotationMethodHandlerAdapter.class)[0]);  

      

                // handlerAdapter = (HandlerAdapter) context.getBean(context  

                // .getNamespace());  

            }  

        }  

      

        /** 

         * 执行request请求的action 

         *  

         * @param request 

         * @param response 

         * @return 

         * @throws Exception 

         */  

          public ModelAndView excuteAction(HttpServletRequest request, HttpServletResponse response)    

          throws Exception {    

                 HandlerExecutionChain chain = handlerMapping.getHandler(request);    

                 final ModelAndView model = handlerAdapter.handle(request, response,    

                         chain.getHandler());    

                 return model;    

             }   

    }

测试类;

    package cn.com.qzinfo.test.example;  

      

    import org.junit.Assert;  

    import org.junit.Test;  

    import org.springframework.mock.web.MockHttpServletRequest;  

    import org.springframework.mock.web.MockHttpServletResponse;  

      

    import cn.com.qzinfo.test.base.JUnitActionBase;  

      

    public class ExampleActionTest extends JUnitActionBase {  

      

        @Test  

        public void test() throws Exception {  

            MockHttpServletRequest request = new MockHttpServletRequest();  

            MockHttpServletResponse response = new MockHttpServletResponse();  

            request.setRequestURI("example_exampleAction_insetExample");  

            request.addParameter("operatorId", "1234");  

            request.addParameter("strRev1", "1234");  

            request.setMethod("post");  

              

                this.excuteAction(request, response);    

                // 执行结果    

                String result = response.getContentAsString();    

                Assert.assertNotNull(result);    

        }  

    }

Action类：

package cn.com.qzinfo.example.action;



import javax.annotation.Resource;



import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;



import cn.com.qzinfo.example.model.Example;

import cn.com.qzinfo.example.service.ExampleService;



@Controller

@RequestMapping(value = "/example")  

public class ExampleAction {

	@Resource

	private ExampleService exampleServcie;



	@RequestMapping(value = "example_exampleAction_insetExample")

	public ModelAndView insertExample(Example example) {

		exampleServcie.insertExample(example);

		return new ModelAndView("/example/exampleList");

	}



}

springMVC-servlet.xml:

    <?xml version="1.0" encoding="UTF-8"?>  

    <beans xmlns="http://www.springframework.org/schema/beans"  

        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"  

        xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context"  

        xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"  

        xsi:schemaLocation="          

            http://www.springframework.org/schema/beans           

            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd          

            http://www.springframework.org/schema/mvc           

            http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd          

            http://www.springframework.org/schema/context           

            http://www.springframework.org/schema/context/spring-context-3.0.xsd"  

        default-autowire="byName">  

        <!-- 自动扫描    -->  

        <context:component-scan base-package="cn.com.qzinfo" />  

        <!-- 使用spring MVC 注解功能   -->  

        <mvc:annotation-driven />       

        <bean  

            class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />  

        <!-- 对模型试图层的解析-->  

        <bean  

            class="org.springframework.web.servlet.view.InternalResourceViewResolver"  

            p:prefix="/WEB-INF/jsp/" p:suffix=".jsp"></bean>  

      

    </beans>

...全文

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nihaodadapeng 2014-12-22

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你的这个问题解决了吗

sdsxxb 2014-11-30

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// 这里需要声明request的实际类型，否则会报错 request.setAttribute(HandlerMapping.INTROSPECT_TYPE_LEVEL_MAPPING, true); 这句也写了还是报空指针的错

NissanZh 2013-10-06

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小雷FansUnion 2013-07-26

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// 这里需要声明request的实际类型，否则会报错 request.setAttribute(HandlerMapping.INTROSPECT_TYPE_LEVEL_MAPPING, true);

忙碌小生 2013-04-26

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查看源码，报错的地方是


private boolean useTypeLevelMapping(HttpServletRequest request) {
			if (!hasTypeLevelMapping() || ObjectUtils.isEmpty(getTypeLevelMapping().value())) {
				return false;
			}
			return (Boolean) request.getAttribute(HandlerMapping.INTROSPECT_TYPE_LEVEL_MAPPING);
		}

跟踪这个方法，发现最终是由DispatcherServlet.class里面的doService方法来调用的。这就解释了为什么我们模拟请求时会报错了，我们根本就没有走正常的流程，所以这个INTROSPECT_TYPE_LEVEL_MAPPING属性的设置代码，并没有执行。只要在模拟请求前，将HandlerMapping.INTROSPECT_TYPE_LEVEL_MAPPING设为true就行了。 request.setAttribute(HandlerMapping.INTROSPECT_TYPE_LEVEL_MAPPING, true);

忙碌小生 2013-04-26

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遇到同样的问题了，不知道楼主解决没

花谢尊前不敢香 2013-03-27

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public ModelAndView excuteAction上面没有加上@Test