SSM框架整合(mybatis、Spring、SpringMVC)

SSM框架整合

1.创建maven工程
2.导入依赖（ssm基本的依赖）

<!--mysql-->
<dependency>
  <groupId>mysql</groupId>
  <artifactId>mysql-connector-java</artifactId>
  <version>5.1.47</version>
</dependency>
<!-- c3p0 -->
<dependency>
  <groupId>com.mchange</groupId>
  <artifactId>c3p0</artifactId>
  <version>0.9.5.2</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>3.5.2</version>
</dependency>
<dependency>
  <groupId>org.mybatis</groupId>
  <artifactId>mybatis-spring</artifactId>
  <version>2.0.2</version>
</dependency>

<!--Spring-->
<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>

<!--junit-->
<dependency>
  <groupId>junit</groupId>
  <artifactId>junit</artifactId>
  <version>4.12</version>
  <scope>test</scope>
</dependency>

这里没有导入jsp和servlet，我使用的是tomcat自带的。也可以自己加上去

<dependency>
   <groupId>javax.servlet</groupId>
   <artifactId>servlet-api</artifactId>
   <version>3.1.0</version>
 </dependency>
<dependency>
   <groupId>javax.servlet.jsp</groupId>
   <artifactId>jsp-api</artifactId>
   <version>2.2</version>
  </dependency>

3.建立框架结构

包括controller、dao、pojo、service和mybatis.xml
mybatis.xml

<?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>

</configuration>

4.数据库配置文件编写jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=false&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456

5.编写mybatis.xml核心配置文件
（这里基本不需要配置什么，主要都在下面的spring-mybatis.xml里面配置）

<?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.ty.pojo"/>
</typeAliases>
</configuration>

6.编写实体类、dao接口、service接口以及serviceImpl实现类

7.配置Spring整合mybatis，创建spring-batis.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: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/tx
    http://www.springframework.org/schema/tx/spring-tx.xsd">

<bean id="placeholderConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer" >
    <property name="location" value="classpath:jdbc.properties" />
</bean>

<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连接池的私有属性 -->
    <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.配置SqlSessionFactory对象 -->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
    <!-- 注入数据库连接池 -->
    <property name="dataSource" ref="dataSource"/>
    <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    <!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
    <property name="configLocation" value="classpath:mybatis.xml"/>
</bean>

<!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
<!--解释 ：https://www.cnblogs.com/jpfss/p/7799806.html-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <!-- 注入sqlSessionFactory -->
    <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
    <!-- 给出需要扫描Dao接口包 -->
    <property name="basePackage" value="com.ty.dao"/>
</bean>

<!--spring的事务管理 数据源的事务管理者 id为框架默认自带的id-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" >
    <!--指定数据源为之前配置的数据源-->
    <property name="dataSource" ref="dataSource" />
</bean>
<!--注解驱动-->
<tx:annotation-driven/>
</beans>

8.配置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">

 <!--配置SpringMVC前置分发器-->
<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
  <param-name>contextConfigLocation</param-name>
  <param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
  </servlet>
 <servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

 <!--配置上下文初始化 全局配置文件-->
 <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>

  <!--配置中文乱码问题-->
  <filter>
<filter-name>Encoding</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>Encoding</filter-name>
<url-pattern>/*</url-pattern>
 </filter-mapping>
</web-app>

到这里，运行，正常访问到index.jsp页面，
整合完毕

bean不存在
排错思路：
1.查看bean是否注入成功 —>成功
2.junit单元测试，是否 成功—>成功
3.问题不是出在底层，是spring配置问题
4.springMVC整合时，没调到service层的bean
1.applicationContexe.xml没有bean
2.web.xml中，也绑定了配置文件，（发现问题，配置的时spring-mvc.xml）,确实没有绑定spring-service的bean，所以报空指针。

问题：
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘booksDao’ defined in file [E:\Study\ReviewSSM\target\ReviewSSM\WEB-INF\classes\com\ty\dao\BooksDao.class]: Cannot resolve reference to bean ‘sqlSessionFactoryBean’ while setting bean property ‘sqlSessionFactory’; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘sqlSessionFactoryBean’ defined in class path resource [spring-mybatis.xml]: Invocation of init method failed; nested exception is org.springframework.core.NestedIOException: Failed to parse mapping resource: ‘file [E:\Study\ReviewSSM\target\ReviewSSM\WEB-INF\classes\mapper\BookDaoMapper.xml]’; nested exception is org.apache.ibatis.builder.BuilderException: Error creating document instance. Cause: org.xml.sax.SAXParseException; lineNumber: 10; columnNumber: 10; 尾随节中不允许有内容。

解决方法：在配置文件中又爆红的信息。删除即可

问题：cahegeManege是因为spring-mvc 设置注解驱动的tx不对，自动生成是cache，改成tx就行了
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘org.springframework.cache.interceptor.CacheInterceptor#0’: Cannot resolve reference to bean ‘cacheManager’ while setting bean property ‘cacheManager’; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named ‘cacheManager’ available

问题：映射重复了
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping’: Invocation of init method failed; nested exception is java.lang.IllegalStateException: Ambiguous mapping. Cannot map ‘booksController’ method
public java.lang.String com.ty.controller.BooksController.addBook(com.ty.pojo.Books)
to { /book/addBook}: There is already ‘booksController’ bean method

解决方法：换一个映射，在xxxcontroller.java文件中，不要出现同名的映射