HTTP Status 500 – Internal Server Error

错误信息：

Type Exception Report

Message No bean named 'UserController' available

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'UserController' available
org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:685)
org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1210)
org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1089)
com.imooc.hospital.global.DispatcherServlet.service(DispatcherServlet.java:63)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
com.imooc.hospital.global.LoginFilter.doFilter(LoginFilter.java:25)
com.imooc.hospital.global.EncodingFilter.doFilter(EncodingFilter.java:18)

Note The full stack trace of the root cause is available in the server logs.

spring.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: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.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop.xsd
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!-- Spring整合Mybatis -->
    <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/hospital?useUnicode=true&amp;characterEncoding=utf-8&amp;serverTimezone=GMT%2B8"/>
        <property name="username" value="root"/>
        <property name="password" value="123"/>
    </bean>
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--属性-->
        <property name="dataSource" ref="dataSource"/>
        <!--别名:可以不填加包名，直接使用类-->
        <property name="typeAliasesPackage" value="com.imooc.hospital.entity"/>
    </bean>
    <!--指定一个包，包里面放置对应的持久化操作接口和映射文件，将接口全部整合起来实现具体功能-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.imooc.hospital.dao"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
    <!--声明式事务-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--定义通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="get*" read-only="true"/>
            <tx:method name="find*" read-only="true"/>
            <tx:method name="search*" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>
    <aop:config>
        <aop:pointcut id="txPointcut" expression="execution(* com.imooc.hospital.service.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointcut"/>
    </aop:config>
    <!--全局扫描-->
    <context:component-scan base-package="com.imooc.hospital"/>
    <aop:aspectj-autoproxy/>
    
</beans>

DispatcherServlet

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package com.imooc.hospital.global;

import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class DispatcherServlet extends GenericServlet {
    private ApplicationContext context;

    public DispatcherServlet() {
    }

    public void init() throws ServletException {
        super.init();
        this.context = new ClassPathXmlApplicationContext("spring.xml");
    }

    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
        HttpServletRequest request = (HttpServletRequest)servletRequest;
        HttpServletResponse response = (HttpServletResponse)servletResponse;
        String path = request.getServletPath().substring(1);
        String beanName = null;
        String methodName = null;
        int index = path.indexOf(47);
        System.out.println("创建成功");
        if (index != -1) {
            beanName = path.substring(0, index) + "Controller";
            methodName = path.substring(index + 1, path.indexOf(".do"));
        } else {
            beanName = "userController";
            methodName = path.substring(0, path.indexOf(".do"));
        }

        Object obj = this.context.getBean(beanName);

        try {
            Method method = obj.getClass().getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class);
            method.invoke(obj, request, response);
        } catch (NoSuchMethodException var11) {
            var11.printStackTrace();
        } catch (IllegalAccessException var12) {
            var12.printStackTrace();
        } catch (InvocationTargetException var13) {
            var13.printStackTrace();
        }

    }
}

UserController

package com.imooc.hospital.controller;

import com.imooc.hospital.entity.User;
import com.imooc.hospital.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@Controller("userController")
public class UserController {
    @Autowired
    private UserService selfService;

    //      /toLogin.do
    public void toLogin(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.getRequestDispatcher("login.jsp").forward(request,response);
    }
    public void login(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String account = request.getParameter("username");
        String password = request.getParameter("password");

        User user = selfService.login(account,password);
        if (user == null){
            response.sendRedirect("toLogin.do");
        }else {
            //存放在session中，先提取session
            HttpSession session = request.getSession();
            session.setAttribute("USER",user);
            response.sendRedirect("main.do");
        }
    }
    public void logout(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //存放在session中，先提取session在进行提取
        HttpSession session = request.getSession();
        session.setAttribute("USER", null);
        response.sendRedirect("toLogin.do");
    }
    // main.do
    public void main(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.getRequestDispatcher("category.jsp").forward(request,response);
    }

}

控制台没有报错和警告，从报错信息来看就是没有UserController的这个bean,但我不太明白为什么会有这个错误，请老师指教一下