【SSM】No qualifying bean of type

one_two_three_ 2017-10-20 02:59:00

异常：
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'testController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.how2java.service.CsHomeworkService com.how2java.controller.TestController.csHomeworkService; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.how2java.service.CsHomeworkService] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
代码：



package com.how2java.controller;



import java.util.List;



import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

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

import org.springframework.web.servlet.ModelAndView;





import com.how2java.pojo.CsHomework;

import com.how2java.service.CsHomeworkService;



@Controller

@RequestMapping("")

public class TestController {

	

	@Autowired

	CsHomeworkService csHomeworkService;

	

	@RequestMapping("dachuang")

	public ModelAndView show(){

		ModelAndView mav = new ModelAndView();

		List<CsHomework> cs= csHomeworkService.list();

		

		// 鏀惧叆杞彂鍙傛暟

		mav.addObject("cs", cs);

		// 鏀惧叆jsp璺緞

		mav.setViewName("listCsHomework");

		return mav;

		

	}

}

applicationContext.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:aop="http://www.springframework.org/schema/aop"

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

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

	xmlns:mvc="http://www.springframework.org/schema/mvc"

	xsi:schemaLocation="

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

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

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

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

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

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

     

     <context:annotation-config/>

     <context:component-scan base-package="com.how2java.service"/>

        

     <!-- 配置数据源 -->

     <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">  

	  <property name="driverClassName">  

	      <value>com.mysql.jdbc.Driver</value>  

	  </property>  

	  <property name="url">  

	      <value>jdbc:mysql://localhost:3306/python?characterEncoding=UTF-8</value>  

	

	  </property>  

	  <property name="username">  

	      <value>root</value>  

	  </property>  

	  <property name="password">  

	      <value>***********</value>  

	  </property>  	

	</bean>

     	

     <!-- 扫描存放SQL语句的CsHomework.xml -->

     <bean id="sqlSession" class="org.mybatis.spring.SqlSessionFactoryBean">

        <property name="typeAliasesPackage" value="com.how2java.pojo" />

        <property name="dataSource" ref="dataSource"/>

        <property name="mapperLocations" value="classpath:com/how2java/mapper/*.xml"/>

    </bean>

 

 <!-- 扫描Mapper，并将其生命周期纳入Spring的管理 -->

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">

        <property name="basePackage" value="com.how2java.mapper"/>

    </bean>

     

</beans>

springMVC.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:aop="http://www.springframework.org/schema/aop"

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

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

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd

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

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

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

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

        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

	

	<!-- 扫描Controller,并将其生命周期纳入Spring管理 -->

	<context:annotation-config/>



    <context:component-scan base-package="com.how2java.controller">

          <context:include-filter type="annotation" 

          expression="org.springframework.stereotype.Controller"/>

    </context:component-scan>

    

    <!-- 注解驱动，以使得访问路径与方法的匹配可以通过注解的方式配置 -->

    <mvc:annotation-driven />

    <!-- 静态页面，如html,css,js,images可以访问 -->

    <mvc:default-servlet-handler />

    

    <!-- 视图定位到/WEB/INF/jsp 这个目录下 -->

	<bean

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

        <property name="viewClass"

            value="org.springframework.web.servlet.view.JstlView" />

        <property name="prefix" value="/WEB-INF/jsp/" />

        <property name="suffix" value=".jsp" />

    </bean>

</beans>

web.xml



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

<!-- 在WEB-INF目录下新增加web.xml，这个web.xml有两个作用：

1. 通过ContextLoaderListener在web app启动的时候，获取contextConfigLocation配置文件的文件名applicationContext.xml，并进行Spring相关初始化工作



2. 有任何访问，都被DispatcherServlet所拦截，这就是Spring MVC那套工作机制了。 -->

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 

         xmlns="http://java.sun.com/xml/ns/javaee" 

         xmlns:web="http://java.sun.com/xml/ns/javaee" 

         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">



	<!-- spring的配置文件-->

	<context-param>

		<param-name>contextConfigLocation</param-name>

		<param-value>classpath:applicationContext.xml</param-value>

	</context-param>

	<listener>

		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

	</listener>

	

	<!-- spring mvc核心：分发servlet -->

	<servlet>

		<servlet-name>mvc-dispatcher</servlet-name>

		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

		<!-- spring mvc的配置文件 -->

		<init-param>

			<param-name>contextConfigLocation</param-name>

			<param-value>classpath:springMVC.xml</param-value>

		</init-param>

		<load-on-startup>1</load-on-startup>

	</servlet>

	<servlet-mapping>

		<servlet-name>mvc-dispatcher</servlet-name>

		<url-pattern>/</url-pattern>

	</servlet-mapping>

</web-app>





@Service

public class CsHomeworkServiceImpl implements CsHomeworkService{



	@Autowired

	CsHomeworkMapper cs;

	

	@Override

	public List<CsHomework> list() {

		return cs.list();

	}



}



@Controller

@RequestMapping("")

public class TestController {

	

	@Autowired

	CsHomeworkService csHomeworkService;

	

	@RequestMapping("dachuang")

	public ModelAndView show(){

		ModelAndView mav = new ModelAndView();

		List<CsHomework> cs= csHomeworkService.list();

		

		// 鏀惧叆杞彂鍙傛暟

		mav.addObject("cs", cs);

		// 鏀惧叆jsp璺緞

		mav.setViewName("listCsHomework");

		return mav;

		

	}

}

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one_two_three_ 2017-10-21

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oo 我发现了，因为我的service接口的包名是com.how2java.service 而实现类所在的包名是com.how2java.serviceimpl 所以无法实现 @Autowired CsHomeworkService cHomeworkService; 正确的做法是，将实现类的报名改成com.how2java.service.impl 实现类和接口都在com.how2java.service文件下，才能自动注入（应该是吧。

one_two_three_ 2017-10-21