ssm框架整合超详细

SSM启动流程简介

1. tomcat加载应用
2. 读取web.xml的内容，先加载context-param的值，在加载listener的值，然后filter，最后servlet的值
3. 项目启动，需要服务器为SpringMVC创建前端控制器，前端控制器就是一个Servlet，也就是DispatcherServlet，所以需要在web.xml配置该Servlet，Servlet参数通过applicationcontext-mvc.xml文件进行配置的，在创建DispatcherServlet的时候需要指定读取该文件的路径，这需要通过该对象的初始化参数进行配置。
   
4. 服务器启动spring也要同步启动，在web.xml中实现对spring的加载，通过spring框架下的项目启动监听器(ContextLoaderListener)来实现，由于服务器启动后无法直接读取WEB-INF下的配置文件，所以需要通过context-param标签重新指定spring配置文件的路径，这时通过contextConfigLocation进行配置。

<context-param>
    <param-name>contextConfigLocationparam-name>
    <param-value>classpath:applicationContext.xmlparam-value>
  context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
  listener>

5.SpringMVC中的对象本来就在Spring容器中。由于springmvc.xml配置文件是对web层进行的的配置，所以第一步需要开启组件扫描，去扫描Controller所在的包。

6.开启SpringMVC的运行需要三大组件即，处理器映射器，处理器适配器和视图解析器，这三个都需要配置开启。

• 配置数据源（数据库连接信息），然后通过bean获得SqlSessionFactoryBean对象，最后需要得到与接口对应的Mapper映射文件
  

  • 开启组件扫描，通过组件扫描使所有的注解生效。由于在service主要涉及事务，所以需要获得在applicationcontext-dao.xml文件中的数据源创建平台事务管理器,transactionManager.
  • 

1，新建Maven工程

• 补充目录结构

• reourrces新建mapper目录，用于存放mapper.xml映射文件
• 补充java的mvc结构
  

2，pom.xml文件

<properties>
    <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
    <maven.compiler.source>1.8maven.compiler.source>
    <maven.compiler.target>1.8maven.compiler.target>
    <spring.version>5.0.2.RELEASEspring.version>
    <slf4j.version>1.6.6slf4j.version>
    <log4j.version>1.2.12log4j.version>
    <mysql.version>5.1.6mysql.version>
    <mybatis.version>3.4.5mybatis.version>
  properties>
<dependencies>
    <dependency>
      <groupId>junitgroupId>
      <artifactId>junitartifactId>
      <version>4.11version>
      <scope>testscope>
    dependency>

    <dependency>
      <groupId>org.aspectjgroupId>
      <artifactId>aspectjweaverartifactId>
      <version>1.6.8version>
    dependency>

    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-aopartifactId>
      <version>${spring.version}version>
    dependency>
    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-contextartifactId>
      <version>${spring.version}version>
    dependency>

    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-webartifactId>
      <version>${spring.version}version>
    dependency>
    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-webmvcartifactId>
      <version>${spring.version}version>
    dependency>
    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-testartifactId>
      <version>${spring.version}version>
    dependency>

    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-txartifactId>
      <version>${spring.version}version>
    dependency>
    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-jdbcartifactId>
      <version>${spring.version}version>
    dependency>

    <dependency>
      <groupId>mysqlgroupId>
      <artifactId>mysql-connector-javaartifactId>
      <version>${mysql.version}version>
    dependency>

    <dependency>
      <groupId>javax.servletgroupId>
      <artifactId>servlet-apiartifactId>
      <version>2.5version>
      <scope>providedscope>
    dependency>

    <dependency>
      <groupId>javax.servlet.jspgroupId>
      <artifactId>jsp-apiartifactId>
      <version>2.0version>
      <scope>providedscope>
    dependency>

    <dependency>
      <groupId>jstlgroupId>
      <artifactId>jstlartifactId>
      <version>1.2version>
    dependency>

    <dependency>
      <groupId>org.mybatisgroupId>
      <artifactId>mybatisartifactId>
      <version>${mybatis.version}version>
    dependency>

    <dependency>
      <groupId>org.mybatisgroupId>
      <artifactId>mybatis-springartifactId>
      <version>1.3.0version>
    dependency>
    
    <dependency>
      <groupId>com.alibabagroupId>
      <artifactId>druidartifactId>
      <version>1.1.12version>
    dependency>
    
    <dependency>
      <groupId>com.fasterxml.jackson.coregroupId>
      <artifactId>jackson-coreartifactId>
      <version>2.9.0version>
    dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.coregroupId>
      <artifactId>jackson-databindartifactId>
      <version>2.9.0version>
    dependency>
  dependencies>

补充:里面添加，可能有时候会找不到xml文件

<resources>
      <resource>
        <directory>src/main/javadirectory>
        <includes>
          <include>**/*.xmlinclude>
        includes>
      resource>
    resources>

3，mybatis整合

• resources下新建mybatis.xml

<configuration>
    <settings>
        
        <setting name="returnInstanceForEmptyRow" value="true"/>
        <setting name="logImpl" value="STDOUT_LOGGING"/>
    settings>
configuration>

• resources新建jdbc.properties
  配置自己数据库信息

jdbc.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&characterEncoding=utf-8
jdbc.username=root
jdbc.password=123456
jdbc.max=20

• resources下新建applicationContext.xml

<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
        https://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
        https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <bean id="myDataSource" class="com.alibaba.druid.pool.DruidDataSource"
          init-method="init" destroy-method="close">
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="maxActive" value="${jdbc.max}"/>
    bean>

    
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="myDataSource"/>
        
        <property name="configLocation" value="classpath:mybatis.xml"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    bean>
beans>

• dao对象
  添加到applicationContext.xml

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <property name="basePackage" value="com.jiu.dao"/>
    bean>

4.springmvc整合

1. web.xml中配置前端控制器（DispatcherServlet）
2. 创建springmvc.xml的配置文件，编写配置文件
3. spring和springmvc整合

读方式

• resources新建springmvc.xml

<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: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
        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/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    
    <context:component-scan base-package="com.jiu.controller" />
    
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    bean>
    
    <mvc:annotation-driven/>
    
    <mvc:default-servlet-handler/>

    <bean id="utf8Charset" class="java.nio.charset.Charset"
          factory-method="forName">
        <constructor-arg value="UTF-8"/>
    bean>

    <mvc:annotation-driven>
        <mvc:message-converters>
            <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                <constructor-arg ref="utf8Charset"/>
            bean>
        mvc:message-converters>
    mvc:annotation-driven>
beans>

• web.xml

<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"
         metadata-complete="true">
  
  <servlet>
    <servlet-name>springmvcservlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
    <load-on-startup>1load-on-startup>
    <init-param>
      <param-name>contextConfigLocationparam-name>
      <param-value>classpath:springmvc.xmlparam-value>
    init-param>
  servlet>
  <servlet-mapping>
    <servlet-name>springmvcservlet-name>
    <url-pattern>/url-pattern>
  servlet-mapping>
  
  <context-param>
    <param-name>contextConfigLocationparam-name>
    <param-value>classpath:applicationContext.xmlparam-value>
  context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
  listener>
  
  <filter>
    <filter-name>encodingfilter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
    <init-param>
      <param-name>encodingparam-name>
      <param-value>utf-8param-value>
    init-param>
    <init-param>
      <param-name>forceRequestEncodingparam-name>
      <param-value>trueparam-value>
    init-param>
    <init-param>
      <param-name>forceResponseEncodingparam-name>
      <param-value>trueparam-value>
    init-param>
  filter>
  <filter-mapping>
    <filter-name>encodingfilter-name>
    <url-pattern>/*url-pattern>
  filter-mapping>
web-app>

• applicationContext.xml中添加

    <context:component-scan base-package="com.jiu.service"/>
    
    
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="myDataSource" />
    bean>

    
    <tx:annotation-driven transaction-manager="transactionManager" />

• 完整的applicationContext.xml

<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">

    
    <context:property-placeholder location="classpath:jdbc.properties"/>
    <bean id="myDataSource" class="com.alibaba.druid.pool.DruidDataSource"
          init-method="init" destroy-method="close">
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="maxActive" value="${jdbc.max}"/>
    bean>

    
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="myDataSource"/>

        <property name="configLocation" value="classpath:mybatis.xml"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    bean>

    
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <property name="basePackage" value="com.jiu.dao"/>
    bean>

    
    <context:component-scan base-package="com.jiu.service"/>
    
    
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="myDataSource" />
    bean>

    
    <tx:annotation-driven transaction-manager="transactionManager" />
beans>

5.配置tomcat

6.大功告成