SpringMVC基础(三)

SpringMVC基础（三）整合SSM

首先先建一个数据库

CREATE DATABASE `ssmbuild`;

USE `ssmbuild`;

DROP TABLE IF EXISTS `books`;

CREATE TABLE `books`(
    `bookId` INT(10) NOT NULL AUTO_INCREMENT,
    `bookName` VARCHAR(100) NOT NULL,
    `bookCounts` INT(11) NOT NULL,
    `detail` VARCHAR(200) NOT NULL,
    KEY `bookId` (`bookId`)    
) ENGINE=INNODB DEFAULT CHARSET=utf8

INSERT INTO `books`(`bookId`, `bookName`, `bookCounts`, `detail`) VALUES
(1, "Java", 1, "从入门到放弃"),
(2, "MySql", 10, "从删库到跑路"),
(3, "Linux", 5, "从进门到进牢");

导包

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.11</version>
    </dependency>

    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.47</version>
    </dependency>
    <dependency>
        <groupId>com.mchange</groupId>
        <artifactId>c3p0</artifactId>
        <version>0.9.5.2</version>
    </dependency>

    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
    </dependency>

    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.2</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.2</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.2</version>
    </dependency>

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.1.9.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.1.9.RELEASE</version>
    </dependency>
</dependencies>

扫描静态资源

<build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
    </resources>
</build>

配置文件

配置文件有：

• Spring的（用来总和的一些配置文件，将这些配置文件关联起来实现跨xml获取spring组件）resource

  • applicationContext.xml （spring总的）
  • spring-dao.xml （dao层）

• Mybatis的（用来说明用了mybatis，因为spring可以直接替代mybatis，作用：起别名、映射mapper）resource

  • mybatis-config.xml （dao层）

• 数据库连接信息（properties）resource

  • jdbc.properties （dao层）

• 将service层的对象注入到spring容器中（用来扫描service层的包）resource

  • spring-service.xml （service层）
  • aop用在service层

• SpringMVC的（用来配置处理器、视图解析器等）resource

  • springmvc-servlet.xml （controller层）

• web的（将spring容器中mvc部分的handler放到servlet容器中，注册一个DispatcherServlet）WEB-INF

  • web.xml （controller层）

0. Spring的配置文件applicationContext（用来总和的一个配置文件）

<?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"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd">
    
    <import resource="classpath:spring-dao.xml"/>
    <import resource="classpath:spring-service.xml"/>
    
</beans>

1. spring在dao层的配置文件spring-dao（拥有mybatis连接信息）

这里与之前配置中的不同之处在于：（整合与非整合的不同处）

• 这里使用的c3p0数据源
• 使用数据库配置文件表示数据库信息
• 使用了mapper自动扫描！（这样就不用写mapper的实现类就可以将mapper注入到spring容器中）在原来是使用了一个sqlSessionTempleton来生成一个sqlSession对象注入到spring容器中，通过实现mapper接口并使用sqlSession对象，将mapper注入到spring容器中！现在不用写maper实现类就可以自动扫描注入到spring容器中 使用的是反射！

<?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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.2.xsd">

    <!--关联数据库配置文件,关联之后你下边才能直接使用-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!-- 创建一个spring的数据源对象 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <!--c3p0的一些私有属性-->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!--关闭连接后不自动commut-->
        <property name="autoCommitOnClose" value="false"/>
        <!--获取连接超时使时间-->
        <property name="checkoutTimeout" value="10000"/>
        <!--当获取连接失败重试次数-->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!-- 根据数据源创建一个sqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!-- 以下属性不是必须的，绑定mybatis的配置文件，这样这个sqlSessionFactory就可以根据mybatis的配置文件的一些信息生成 -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--
    配置mapper接口扫描包，动态的实现了mapper接口可以注入到spring容器中。
    其内置本质还是用了反射。
    这样就不用手动写mapperImpl就可以直接俄注入到spring容器中
    -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--这个属性是一个String类型的，在扫描时将sqlSessionFactory放到扫描类中，实现反射mapper注入spring容器中-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--扫描要扫描的mapper包-->
        <property name="basePackage" value="com.qiu.mapper"/>
    </bean>

</beans>

2. Mybatis的配置文件mybatis-config

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <package name="com.qiu.pojo"/>
    </typeAliases>

    <mappers>
        <mapper class="com.qiu.mapper.BookMapper"/>
    </mappers>
</configuration>

3. service配置文件service-service.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:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.2.xsd">

    <!--扫描service下的包，将其对象注入到spring容器中-->
    <!--需要service的类写上@Service注解-->
    <context:component-scan base-package="com.qiu.service"/>

    <!--将不写注解的service类手动注入到spring容器中-->
    <!--<bean id="bookService" class="com.qiu.service.BookServiceImpl">-->
        <!--<property name="bookMapper" ref="bookMapper"/>-->
    <!--</bean>-->

    <!--声明式事务配置-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--使用事务：使用aop事务支持-->
    
</beans>

4. SpringMVC的配置文件springmvc-servlet（用来配置处理器、视图解析器等）

<?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:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!-- 自动扫描包，使得包中的注解生效 -->
    <context:component-scan base-package="com.qiu.controller"/>
    <!-- 使SpringMVC不处理静态资源，例如：.css .js .html .mp3。过滤这些资源，也就是使用url访问这些资源的时候不会被DispatcherServlet捕获 -->
    <mvc:default-servlet-handler/>

    <!-- 原来需要配置处理映射器、适配器，现在只需要一个注解驱动即可；写上这个spring就会自动帮我们开启两个器，并且自动注入到spring容器中 -->
    <mvc:annotation-driven/>

    <!--视图解析器:DispatcherServlet给他的ModelAndView-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="InternalResourceViewResolver">
        <!--前缀-->
        <property name="prefix" value="/WEB-INF/"/>
        <!--后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

5. web的配置文件web（将spring容器中mvc部分的handler放到servlet容器中）

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <!--1.注册DispatcherServlet-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--关联一个springmvc的配置文件:【servlet-name】-servlet.xml-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <!--启动级别-1-->
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!--/ 匹配所有的请求；（不包括.jsp）-->
    <!--/* 匹配所有的请求；（包括.jsp）-->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--乱码过滤-->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--session配置-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

6. 数据库连接信息jdbc.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?characterEncoding=utf-8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true
jdbc.username=root
jdbc.password=111111

com.qiu.mapper

BookMapper.java：

public interface BookMapper {
    
    
    int addBook(Books books);

    int deleteBookById(@Param("bookId") int id);

    int updateBook(Books books);

    Books queryBookById(@Param("bookId") int id);

    List<Books> queryAllBook();
}

BookMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org/DTD Mapper 3.0"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.qiu.mapper.BookMapper">
    <insert id="addBook" parameterType="Books">
        insert into ssmbuild.books (bookName, bookCounts, detail)
        values (#{bookName}, #{bookCounts}, #{detail});
    </insert>

    <delete id="deleteBookById" parameterType="int">
        delete from ssmbuild.books where id = #{bookId};
    </delete>
    
    <update id="updateBook" parameterType="Books">
        update ssmbuild.books set
        bookName=#{bookName}, bookCounts=#{bookCount}, detail=#{detail}
        where bookId=#{bookId};
    </update>

    <select id="queryBookById" parameterType="int" resultType="Books">
        select * from ssmbuild.books where bookId=#{bookId};
    </select>

    <select id="queryAllBook" resultType="Books">
        select * from ssmbuild.books;
    </select>
</mapper>

需要对mapper接口进行一个Impl才能注入到spring容器中，因为接口没法实例化！

com.qiu.pojo

public class Books {
    
    
    private Integer bookId;
    private String bookName;
    private Integer bookCount;
    private String detail;

    public Books(){
    
    }

    public Books(Integer bookId, String bookName, Integer bookCount, String detail) {
    
    
        this.bookId = bookId;
        this.bookName = bookName;
        this.bookCount = bookCount;
        this.detail = detail;
    }

    public Integer getBookId() {
    
    
        return bookId;
    }

    public void setBookId(Integer bookId) {
    
    
        this.bookId = bookId;
    }

    public String getBookName() {
    
    
        return bookName;
    }

    public void setBookName(String bookName) {
    
    
        this.bookName = bookName;
    }

    public Integer getBookCount() {
    
    
        return bookCount;
    }

    public void setBookCount(Integer bookCount) {
    
    
        this.bookCount = bookCount;
    }

    public String getDetail() {
    
    
        return detail;
    }

    public void setDetail(String detail) {
    
    
        this.detail = detail;
    }
}

com.qiu.service

BookService

public interface BookService {
    
    
    int addBook(Books books);

    int deleteBookById(int id);

    int updateBook(Books books);

    Books queryBookById(int id);

    List<Books> queryAllBook();
}

因为在使用spring时，spring容器托管mapper对象需要mapper的实现类（也就是说mapper的实现类已经使用了sqlsession对mapper接口进行了实现操作，这样才能实例化、spring容器才能托管）所以service层直接注入mapper进行操作即可（你也可以把那个实例化的mapper看成小service）

@Service
public class BookServiceImpl implements BookService {
    
    
    private BookMapper bookMapper;

    public BookServiceImpl(BookMapper bookMapper) {
    
    
        this.bookMapper = bookMapper;
    }

    public void setBookMapper(BookMapper bookMapper) {
    
    
        this.bookMapper = bookMapper;
    }

    public int addBook(Books books) {
    
    
        return bookMapper.addBook(books);
    }

    public int deleteBookById(int id) {
    
    
        return bookMapper.deleteBookById(id);
    }

    public int updateBook(Books books) {
    
    
        return bookMapper.updateBook(books);
    }

    public Books queryBookById(int id) {
    
    
        return bookMapper.queryBookById(id);
    }

    public List<Books> queryAllBook() {
    
    
        return bookMapper.queryAllBook();
    }
}

com.qiu.controller

@Controller
@RequestMapping("/book")
public class BookController {
    
    
    @Autowired
    @Qualifier("bookServiceImpl") //这里使用的是service扫描包自动将service类注入到spring容器中，所以对象就是类名首字母小写
    private BookService bookService;

    // 业务1：查询所有书籍，并且返回到一个书籍页面
    @RequestMapping("/allBook")
    public String queryList(Model model){
    
    
        List<Books> list = bookService.queryAllBook();
        model.addAttribute("allBooks", list);
        return "allBook";
    }
}

一个报错

这是因为：你的controller层找不到service、dao的bean，因为你的web.xml中的Dispatcher中只配置了spring-mvc.xml中的bean，所以你servlet容器中找不到service、dao的bean

错误原因：（web.xml）

<servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:springmvc-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

解决方法：将相关xml导入到applicationContext.xml中然后倒进Dispatcher中

<servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:appplicationContext.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>

错误样例：

HTTP状态 500 - 内部服务器错误
类型 异常报告

消息 Servlet[springmvc]的Servlet.init（）引发异常

描述 服务器遇到一个意外的情况，阻止它完成请求。

例外情况

javax.servlet.ServletException: Servlet[springmvc]的Servlet.init（）引发异常
	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:615)
	org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:818)
	org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1626)
	org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	java.base/java.lang.Thread.run(Thread.java:834)
根本原因。

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'bookController': Unsatisfied dependency expressed through field 'bookService'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.qiu.service.BookService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true), @org.springframework.beans.factory.annotation.Qualifier(value="bookServiceImpl")}
	org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:596)
	org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
	org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
	org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
	org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
	org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:845)
	org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
	org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
	org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:701)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:667)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:715)
	org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:590)
	org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:529)
	org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:169)
	javax.servlet.GenericServlet.init(GenericServlet.java:158)
	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:615)
	org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:818)
	org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1626)
	org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	java.base/java.lang.Thread.run(Thread.java:834)
根本原因。

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.qiu.service.BookService' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true), @org.springframework.beans.factory.annotation.Qualifier(value="bookServiceImpl")}
	org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1658)
	org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1217)
	org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1171)
	org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:593)
	org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90)
	org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:374)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1411)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:592)
	org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:515)
	org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:320)
	org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:318)
	org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199)
	org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:845)
	org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:877)
	org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549)
	org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:701)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:667)
	org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:715)
	org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:590)
	org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:529)
	org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:169)
	javax.servlet.GenericServlet.init(GenericServlet.java:158)
	org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:543)
	org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
	org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:690)
	org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
	org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:615)
	org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
	org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:818)
	org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1626)
	org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
	java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	java.base/java.lang.Thread.run(Thread.java:834)
):注意 主要问题的全部 stack 信息可以在 server logs 里查看