Code Bye

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

码拜
 

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>  

10分
public ModelAndView excuteAction上面没有加上@Test

10分
遇到同样的问题了，不知道楼主解决没

20分
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);
// 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
你的这个问题解决了吗
CodeBye 版权所有丨如未注明 , 均为原创丨本网站采用BY-NC-SA协议进行授权 , 转载请注明使用junit测试springMVC的action出现java.lang.NullPointerException！