Spring mybatis连接失败，出现不满足的DependencyException

Question

我对Spring比较陌生，在建立Spring-mybatis设置环境时遇到了问题。这是我的密码。我得到的例外是

org.springframework.beans.factory.UnsatisfiedDependencyException：为com.infosender.service.UserServiceImpl.创建名为"loginControlroller"的bean时出错

我不明白这个问题。因为UserServiceImpl对象在LoginCroller中是自动连接的，并且UserServiceImpl类是自动连接到UserDaoMapper接口的，所以应该有一个名为UserServiceImp的bean。为什么找不到豆子？

package com.infosender.controller;
import java.sql.SQLException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import com.infosender.user.User;
import com.infosender.user.UserDao;
import com.infosender.user.UserDaoMapper;
import com.infosender.service.UserService;
import com.infosender.service.UserServiceImpl;;

@Controller
public class LoginController {
//UserService userService = UserService.getInstance();
@Autowired
UserServiceImpl userServiceImpl;
@RequestMapping(value="/login", method=RequestMethod.POST)
public String handleRequestInternal(
@ModelAttribute("username") String user_id,
@ModelAttribute("password") String user_pw
) {
User user = null;
try {
user = userServiceImpl.getUserByIdAndPw(user_id, user_pw);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if(user == null) {
return "login_fail";
}
return "main_menu";     
}
}

这是UserService和UserServiceImpl

package com.infosender.service;
import java.sql.SQLException;    
import javax.inject.Inject;    
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;    
import com.infosender.user.User;
import com.infosender.user.UserDao;    
public interface UserService {
public User getUserByIdAndPw(String user_id, String user_pw)throws SQLException;
}
package com.infosender.service;
import java.sql.SQLException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;
import com.infosender.user.User;
import com.infosender.user.UserDao;
import com.infosender.user.UserDaoMapper;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserDaoMapper userDaoMapper;    
public User getUserByIdAndPw(String user_id, String user_pw)throws SQLException {
return userDaoMapper.getUserByIdAndPw(user_id, user_pw);
}   
}

这里我有UserDao和UserDaoMapper

package com.infosender.user;
import java.sql.SQLException;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Controller;
import org.springframework.stereotype.Repository;
@Repository
public class UserDao implements UserDaoMapper{
@Autowired  
private SqlSessionTemplate sqlSession;

public void setSqlSessionTemplate(SqlSessionTemplate sqlSession) {
this.sqlSession = sqlSession;
}
public User getUserByIdAndPw(String user_id, String user_password) {
UserDaoMapper mapper = sqlSession.getMapper(UserDaoMapper.class);
return mapper.getUserByIdAndPw(user_id, user_password);
//return sqlSession.selectOne("com.infosender.user.UserDaoMapper.getUserByIdAndPw");        
}   
}
package com.infosender.user;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;
public interface UserDaoMapper {
public User getUserByIdAndPw(@Param("user_id")String user_id,@Param("user_password")String user_password);  
}

下面是root-context.xml配置。

<?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:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-4.3.xsd
http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">
<context:annotation-config/>

<!-- org.apache.commons.dbcp.BasicDataSource -->
<!-- Root Context: defines shared resources visible to all other web components -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">  
<property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
<property name="url" value="jdbc:mysql://127.0.0.1:3306/InfoSender"></property>
<property name="username" value="root"></property>
<property name="password" value="root"></property>
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="configLocation" value="classpath:/WEB_INF/spring/mybatis/mybatis-config.xml"></property>
<property name="mapperLocations" value="classpath:*/mappers/*mapper.xml"></property>
</bean>
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory"></constructor-arg>
</bean>
<!--    <bean id="userDaoMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="mapperInterface" value="com.infosender.user.UserDaoMapper"></property>
<property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
</bean>
-->
<context:component-scan base-package="com.infosender.*" />
</beans>

以下是整个错误日志

ERROR: org.springframework.web.servlet.DispatcherServlet - Context initialization failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'loginController': Unsatisfied dependency expressed through field 'userService'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.infosender.service.UserService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1378)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:575)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:498)
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:846)
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:863)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:546)
at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:696)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:662)
at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:710)
at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:587)
at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:526)
at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:169)
at javax.servlet.GenericServlet.init(GenericServlet.java:158)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1238)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1151)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1038)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5027)
at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5337)
at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1407)
at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1397)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.infosender.service.UserService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1646)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1205)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1166)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)
... 31 more

Answer 1

致任何可能查看此页面的人。

事实上，问题出现在我的web.xml文件中。在那里，我用contextConfigLocation标记声明了两个xml文件：root-context.xml和mybatis-config.xml。我所做的是，我"单独"编写了它们，因此(我认为(后者以某种方式覆盖了前一个，没有按照应有的方式创建sqlSession bean。

正如评论所暗示的那样，代码中存在一些错误。但这是没有创造出豆子的主要原因。