ssm框架整合,个人学习记录

Posted bky-min

tags:

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SSM框架整合

  • 依赖导入
    • 测试 junit
    • 数据库驱动 连接池 (c3p0 dbcp druid hikari)
    • servlet三连servlet jsp jstl
    • mybatis mybatis-spring
    • spring
    • lombok
<!--junit测试-->
<dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.13</version>
</dependency>
<!--数据库驱动-->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.20</version>
</dependency>
<!--c3p0 数据库连接池-->
<dependency>
    <groupId>com.mchange</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.5.5</version>
</dependency>
<!--servlet-->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
    </dependency>
<!--jsp-->
<dependency>
    <groupId>javax.servlet.jsp</groupId>
    <artifactId>jsp-api</artifactId>
    <version>2.2</version>
</dependency>
<!--jstl-->
<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>
<!--mybatis-->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis</artifactId>
    <version>3.5.4</version>
</dependency>
<!--mybatis-spring整合-->
<dependency>
    <groupId>org.mybatis</groupId>
    <artifactId>mybatis-spring</artifactId>
    <version>2.0.4</version>
</dependency>
<!--spring-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>5.2.6.RELEASE</version>
</dependency>
<!--spring-jdbc-->
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
    <version>5.2.6.RELEASE</version>
</dependency>
<!--lombok-->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.12</version>
</dependency>
  • 静态资源导出问题
<build>
    <resources>
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>true</filtering>
        </resource>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>true</filtering>
        </resource>
    </resources>
</build>

model层

  • pojo

    • Books
    @Data
    @NoArgsConstructor
    @AllArgsConstructor
    public class Books {
        private int bookID;
        private String bookName;
        private int bookCounts;
        private String detail;
    }
    
  • dao

    • mybatis-config.xml
    <?xml version="1.0" encoding="GBK" ?>
    <!DOCTYPE configuration
            PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-config.dtd">
    <configuration>
        <!--设置 日志-->
        <settings>
            <setting name="lohImpl" value="STDOUT_LOGGING"/>
        </settings>
    
        <!--别名-->
        <typeAliases>
            <package name="com.min.pojo"/>
        </typeAliases>
    
        <!--配置数据源,整合后交给spring-->
    
        <mappers>
            <mapper class="com.min.dao.BookMapper"/>
        </mappers>
    </configuration>
    
    • db.properties
    jdbc.driver=com.mysql.jdbc.Driver
    #如果使用MySQL8.0+,需要增加一个时区配置; &serverTimezone=Asia/Shanghai
    jdbc.url=jdbc://mysql://localhost:3306/ssmbuild?useSSL=false&useUnicode=true&characterEncode=utf8&serverTimezone=Asia/Shanghai
    jdbc.username=root
    jdbc.password=123456
    
    • BookMapper接口
    public interface BookMapper {
        //增加一本书
        public int addBook(Books book);
    
        //删除一本书
        public int deleteBookById(@Param("bookId") int id);
    
        //更新一本书
        public int updateBook(Books book);
    
        //查询一本书
        public Books queryBookById(@Param("bookId") int id);
    
        //查询所有的书
        public List<Books> queryAllBooks();
    }
    
    • BookMapper.xml
    <?xml version="1.0" encoding="UTF-8" ?>
    <!DOCTYPE mapper
            PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
            "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.min.dao.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 bookID = #{bookId}
        </delete>
    
        <update id="updateBook" parameterType="Books">
            update ssmbuild.books
            set bookName = #{bookName},
            set bookCounts = #{bookCounts},
            set detail = #{detail}
            where bookID = #{bookId}
        </update>
    
        <select id="queryBookById" resultType="Books">
            select * from ssmbuild.books
            where bookID = #{bookId}
        </select>
    
        <select id="queryAllBooks" resultType="Books">
            select * from ssmbuild.books
        </select>
    </mapper>
    
    • spring-dao.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"
           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">
    
        <!--1、关联数据库配置文件-->
        <context:property-placeholder location="classpath:db.properties"/>
    
        <!--2、连接池
            dbcp: 半自动化,不能自己连接
            c3p0:自动化(自动化加载配置文件,并且自动设置到对象中)
            druid : hikari:
        -->
        <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连接池私有属性-->
            <property name="maxPoolSize" value="30"/>
            <property name="minPoolSize" value="10"/>
            <!--关闭连接后不自动commit-->
            <property name="autoCommitOnClose" value="false"/>
            <!--获取连接超时时间-->
            <property name="checkoutTimeout" value="10000"/>
            <!--当获取连接失败重试次数-->
            <property name="acquireRetryAttempts" value="2"/>
        </bean>
        <!--3、sqlSessionFactory-->
        <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
            <property name="dataSource" ref="dataSource"/>
            <!--绑定mybatis配置文件-->
            <property name="configLocation" value="classpath:mybatis-config.xml"/>
        </bean>
    
        <!--4、配置dao接口扫描包,动态实现Dao接口可以注入到容器中-->
        <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
            <!--注入sqlSessionFactory-->
            <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
            <!--要扫描的dao包-->
            <property name="basePackage" value="com.min.dao"/>
        </bean>
    </beans>
    

    mapper实现另外两种方式

    • 实现类继承SqlSessionDaoSupport
    public class BookMapperImpl extends SqlSessionDaoSupport implements BookMapper {
        public int addBook(Books book) {
            return getSqlSession().getMapper(BookMapperImpl.class).addBook(book);
        }
    }
    

    spring-dao.xml中配置4 要做如下调整

    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能使用构造器注入,源码分析没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
    
    <bean id="userMapper" class="com.min.mapper.UserMapperImpl">
        <!--需要提供SqlSessionDaoSupport的父类需要的sqlSessionFactory对象-->
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
    
    • 实现类使用SqlSessionTemplate对象
    public class BookMapperImpl implements BookMapper {
        private SqlSessionTemplate sessionTemplate;
    
        public void setSessionTemplate(SqlSessionTemplate sessionTemplate) {
            this.sessionTemplate = sessionTemplate;
        }
    
        public int addBook(Books book) {
            return sessionTemplate.getMapper(BookMapperImpl.class).addBook(book);
        }
    }
    

    spring-dao.xml中配置4 要做如下调整

    <bean id="sessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能使用构造器注入,源码分析没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
    
    <bean id="userMapper" class="com.min.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>
    
  • service

    • BookService接口
    @Service
    public interface BookService {
        //增加一本书
        public int addBook(Books book);
    
        //删除一本书
        public int deleteBookById(@Param("bookId") int id);
    
        //更新一本书
        public int updateBook(Books book);
    
        //查询一本书
        public Books queryBookById(@Param("bookId") int id);
    
        //查询所有的书
        public List<Books> queryAllBooks();
    }
    
    • BookServiceImpl实现类
    public class BookServiceImpl implements BookService {
        //service 调用 dao
        private BookMapper bookMapper;
    
        public void setBookMapper(BookMapper bookMapper) {
            this.bookMapper = bookMapper;
        }
    
        public int addBook(Books book) {
            return bookMapper.addBook(book);
        }
    
        public int deleteBookById(int id) {
            return bookMapper.deleteBookById(id);
        }
    
        public int updateBook(Books book) {
            return bookMapper.updateBook(book);
        }
    
        public Books queryBookById(int id) {
            return bookMapper.queryBookById(id);
        }
    
        public List<Books> queryAllBooks() {
            return bookMapper.queryAllBooks();
        }
    }
    
    • spring-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: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/context https://www.springframework.org/schema/context/spring-context.xsd">
    
        <!--1、扫描service下的包-->
        <context:component-scan base-package="com.min.service"/>
    
        <!--2、将我们所有的业务类,注入到Spring,可以通过配置或注解实现-->
        <bean id="BookServiceImpl" class="com.min.service.BookServiceImpl">
            <property name="bookMapper" ref="bookMapper"/>
        </bean>
    
        <!--3、声明式事务-->
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <!--注入数据源-->
            <property name="dataSource" ref="dataSource"/>
        </bean>
    
        <!--4、aop事务支持-->
        <!--结合AOP实现事务的织入-->
        <!--配置事务通知-->
        <tx:advice id="txAdvice" transaction-manager="transactionManager">
            <!--给哪些方法配置事务-->
            <!--配置事务的传播特性: new  propagation-->
            <tx:attributes>
                <tx:method name="*" propagation="REQUIRED"/>
            </tx:attributes>
        </tx:advice>
    
        <!--配置事务切入-->
        <aop:config>
            <aop:pointcut id="txPointCut" expression="execution(* com.min.dao.*.*(..))"/>
            <aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
        </aop:config>
    </beans>
    

view层

  • web

    • index.jsp
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
      <head>
        <title>首页</title>
    
        <style>
          a{
            text-decoration: none;
            color: black;
            font-size: 18px;
          }
          h3{
            width: 180px;
            height: 38px;
            margin: 100px auto;
            text-align: center;
            line-height: 38px;
            background-color: deepskyblue;
            border-radius: 5px;
          }
        </style>
      </head>
      <body>
        <h3>
          <a href="${pageContext.request.contextPath}/book/allBooks">进入数据展示页面</a>
        </h3>
      </body>
    </html>
    
    • addBook.jsp
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>addBook</title>
    
        <%--BootStrap美化界面--%>
        <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    
    </head>
    <body>
    <div class="container">
    
        <div class="row clearfix"><%--清除浮动--%>
            <div class="col-md-12 column"><%--栅格 共12栏--%>
                <h1>
                    <small>新增书籍</small>
                </h1>
            </div>
        </div>
    
        <form action="${pageContext.request.contextPath}/book/addBook" method="post">
            <div class="form-group">
                <label >书籍名称:</label>
                <input type="text" name="bookName" class="form-control" required>
            </div>
            <div class="form-group">
                <label >书籍数量:</label>
                <input type="text" name="bookCounts" class="form-control" required>
            </div>
            <div class="form-group">
                <label >书籍描述:</label>
                <input type="text" name="detail" class="form-control" required>
            </div>
            <div class="form-group">
                <input type="submit" class="form-control" value="添加">
            </div>
        </form>
    </div>
    </body>
    </html>
    
    • allBook.jsp
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>allBooks.jsp</title>
    
        <%--BootStrap美化界面--%>
        <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    
    </head>
    <body>
    
    <div class="container">
    
        <div class="row clearfix"><%--清除浮动--%>
            <div class="col-md-12 column"><%--栅格 共12栏--%>
                <h1>
                    <small>数据列表------展示所有书籍</small>
                </h1>
            </div>
            <div class="col-md-4 column">
                <%--toAddBook--%>
                <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddBook">新增书籍</a>
            </div>
            <div class="col-md-8 column">
                <%--查询书籍--%>
                <form class="form-inline" action="${pageContext.request.contextPath}/book/queryByName" method="post" style="float: right">
                    <span style="color: red;font-weight: bold">${msg}</span>
                    <input type="text" name="bookName" class="form-control" placeholder="请输入要查询的书籍名称">
                    <input type="submit" value="查询" class="btn btn-primary">
                </form>
            </div>
        </div>
    
        <div class="row clearfix"><%--清除浮动--%>
            <div class="col-md-12 column"><%--栅格 共12栏--%>
                <table class="table table-hover table-striped"><%--table-hover隔行变色--%>
                    <thead>
                        <tr>
                            <th>书籍编号</th>
                            <th>书籍名称</th>
                            <th>书籍数量</th>
                            <th>书籍详情</th>
                            <th>操作</th>
                        </tr>
                    </thead>
    
                    <%--书籍从数据库中查询出来,从这个list中遍历出来:foreach--%>
                    <tbody>
                        <tr>
                            <c:forEach var="book" items="${list}">
                                <tr>
                                    <td>${book.bookID}</td>
                                    <td>${book.bookName}</td>
                                    <td>${book.bookCounts}</td>
                                    <td>${book.detail}</td>
                                    <td>
                                        <a href="${pageContext.request.contextPath}/book/toUpdateBook/${book.bookID}">修改</a>
                                        &nbsp;|&nbsp;<a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookID}">删除</a>
                                    </td>
                                </tr>
                            </c:forEach>
                        </tr>
                    </tbody>
                </table>
            </div>
        </div>
    
    </div>
    
    </body>
    </html>
    
    
    • updateBook.jsp
    <%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>updateBook</title>
    
        <%--BootStrap美化界面--%>
        <link href="https://cdn.staticfile.org/twitter-bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">
    
    </head>
    <body>
    <div class="container">
    
        <div class="row clearfix"><%--清除浮动--%>
            <div class="col-md-12 column"><%--栅格 共12栏--%>
                <h1>
                    <small>更新书籍</small>
                </h1>
            </div>
        </div>
    
        <form action="${pageContext.request.contextPath}/book/updateBook" method="post">
            <div class="form-group" hidden="hidden">
                <label >书籍编号:</label>
                <input type="text" name="bookID" class="form-control" value="${qBook.bookID}" />
            </div>
            <div class="form-group">
                <label >书籍名称:</label>
                <input type="text" name="bookName" class="form-control" value="${qBook.bookName}" required/>
            </div>
            <div class="form-group">
                <label >书籍数量:</label>
                <input type="text" name="bookCounts" class="form-control" value="${qBook.bookCounts}" required/>
            </div>
            <div class="form-group">
                <label >书籍描述:</label>
                <input type="text" name="detail" class="form-control" value="${qBook.detail}" required/>
            </div>
            <div class="form-group">
                <input type="submit" class="form-control" value="更新">
            </div>
        </form>
    </div>
    </body>
    </html>
    
    • web.xml
    <?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、DispatcherServlet-->
        <servlet>
            <servlet-name>springmvc</servlet-name>
            <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
            <!--初始化web配置-->
            <init-param>
                <param-name>contextConfigLocation</param-name>
                <param-value>classpath:applicationContext.xml</param-value>
            </init-param>
            <!--启动级别-->
            <load-on-startup>1</load-on-startup>
        </servlet>
        <servlet-mapping>
            <servlet-name>springmvc</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
        
        <!--2、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>
    
        <!--3、Session超时-->
        <session-config>
            <session-timeout>15</session-timeout>
        </session-config>
    </web-app>
    

Controller层

  • controller

    • BookController
    @Controller
    @RequestMapping("/book")
    public class BookController {
        // controller 调用 Service
        @Autowired
        @Qualifier("BookServiceImpl")
        private BookService bookService;
    
        public void setBookService(BookService bookService) {
            this.bookService = bookService;
        }
    
        //查询全部书籍,返回到书籍展示页面
        @RequestMapping("/allBooks")
        public String list(Model model){
            List<Books> books = bookService.queryAllBooks();
            model.addAttribute("list",books);
            return "allBooks";
        }
    
        //去新增书籍
        @RequestMapping("/toAddBook")
        public String addBook(Model model){
            return "addBook";
        }
    
        //新增书籍
        @RequestMapping("/addBook")
        public String addBook(Books books){
            System.out.println("addBook => " + books);
            bookService.addBook(books);
            return "redirect:/book/allBooks"; // 重定向到@RequestMapping("/allBooks")请求
        }
    
        //去更新书籍
        @RequestMapping("/toUpdateBook/{bookID}")
        public String updateBook(@PathVariable int bookID, Model model){
            Books books = bookService.queryBookById(bookID);
            model.addAttribute("qBook", books);
            return "updateBook";
        }
    
        //新增书籍
        @RequestMapping("/updateBook")
        public String updateBook(Books books){
            System.out.println("updateBook => " + books);
            bookService.updateBook(books);
            return "redirect:/book/allBooks"; // 重定向到@RequestMapping("/allBooks")请求
        }
    
        //删除书籍
        @RequestMapping("/deleteBook/{bookID}")
        public String deleteBook(@PathVariable int bookID){
            System.out.println("deleteID => " + bookID);
            bookService.deleteBookById(bookID);
            return "redirect:/book/allBooks";
        }
    
        //根据名称查询书籍
        @RequestMapping("/queryByName")
        public String queryBooksByName(String bookName, Model model){
            System.out.println("bookName => " + bookName);
            model.addAttribute("msg", "");
            if(bookName == null || bookName.equals("")){
                model.addAttribute("msg", "请输入要查询书籍名称");
                List<Books> books = bookService.queryAllBooks();
                model.addAttribute("list", books);
            }else{
                List<Books> books = bookService.queryBooksByName(bookName);
                model.addAttribute("list", books);
            }
            return "allBooks";
        }
    }
    
    • spring-mvc.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: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/cache http://www.springframework.org/schema/cache/spring-cache.xsd">
    
        <!--1、注解驱动-->
        <mvc:annotation-driven/>
    
        <!--2、静态资源过滤-->
        <mvc:default-servlet-handler/>
    
        <!--3、扫描包:controller-->
        <context:component-scan base-package="com.min.controller"/>
        
        <!--4、视图解析器-->
        <bean 			class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <!--前缀-->
            <property name="prefix" value="/WEB-INF/jsp/"/>
            <!--后缀-->
            <property name="suffix" value=".jsp"/>
        </bean>
    
    </beans>
    

spring主配置

  • 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: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/context https://www.springframework.org/schema/context/spring-context.xsd">
  
      <import resource="classpath:spring-dao.xml"/>
      <import resource="classpath:spring-service.xml"/>
      <import resource="classpath:spring-mvc.xml"/>
  </beans>

整合中的错误及解决方案 笔记

问题:service层bean不存在

步骤:
1、看这个bean注入是否成功
2、junit单元测试,看代码是否可以查询到结果
3、问题出在Spring
4、springMVC整合时没有调用到service的bean
    1、applicationContext.xml 没有注入bean
    2、web.xml中,我们也绑定过配置文件,发现配置的是mvc.xml

    解决方式:web.xml中引用spring核心配置文件!

问题:更新操作提交更新的SQL,但是修改失败
1、初次考虑是事务问题,显式声明事务后依旧失败
2、查看sql语句打印结果,没有传送id

    解决方式:前端隐藏域传递id

问题:29-May-2020 14:13:14.568 严重 [http-nio-8080-exec-4]
    org.springframework.web.servlet.FrameworkServlet.
    initServletBean Context initialization failed
       org.springframework.beans.factory.BeanCreationException:
       Error creating bean with name ‘sqlSessionFactory‘
       defined in class path resource [spring-dao.xml]:
       Invocation of init method failed; nested exception
       is org.springframework.core.NestedIOException:
       Failed to parse config resource: class path resource
       [mybatis-config.xml]; nested exception is
       org.apache.ibatis.builder.BuilderException:
       Error parsing SQL Mapper Configuration.
       Cause: org.apache.ibatis.builder.BuilderException:
       The setting lohImpl is not known.
       Make sure you spelled it correctly (case sensitive).
1、检查spring-dao.xml的配置文件引用,没有问题
2、检查mybatis-config.xml配置,发现setting中新增日志书写问题

    解决方式:<setting name="logImpl" value="STDOUT_LOGGING"/>书写错误处理

问题:模糊查询拼接问题

	解决方式:1、在调用处手动的去添加“%”通配符
			2、%#{bookName}%程序会报错,原因是:缺少单引号。
			3、‘%#{bookName}%’程序依然会报错,原因是:如果加上单引号,那么就当成是一个字符串,而#{ }写在字符串中不能识别,要改写成${ }这种形式
			4、借助mysql的函数concat(‘%‘,#{bookName},‘%‘)

问题:applicationContext配置包扫描

    解决方式:<!--自动扫描指定的包,包中的所有注解交由Spring管理-->
         <context:component-scan base-package="com.min.controller"/>

问题:com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException:
    1 字节的 UTF-8 序列的字节 1 无效。

    解决方式:<?xml version="1.0" encoding="GBK"?>修改配置文件字符集GBK

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