springmvc_ssm Spring、SpringMVC、MyBatis集成

 

集成流程理解

三层架构中，控制层调用Service层,Service层调用Dao层，控制层会将Bean对象注入到SpringMVCIOC容器中，Service和Dao层会将Bean对象注入到SpringIOC容器中，而SpringMVCIOC容器的父容器正好是SpringIOC容器，子容器可以使用父容器的Bean对象，所以可以实现三大框架集成

SpringMVCIOC容器会自动将SpringIOC容器设置为自己的父容器。

 

环境准备：在pom文件中导入各种依赖

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_3_1.xsd"
         version="3.1">

    <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:springmvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <filter>
        <filter-name>characterEncodingFilter</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>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <!--监听器，容器加载监听器-->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!--初始化容器参数-->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring.xml</param-value>
    </context-param>
</web-app>

最好每一步集成完都先进行相应测试

 

集成SpringMVC

控制器

package com.zl.controller;

import com.bean.Account;
import com.zl.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.List;

@Controller
@RequestMapping("/account")
public class AccountController {
    @Autowired
    private AccountService accountService;
    @RequestMapping("/find")
    public String find() {
        List<Account> list = accountService.findAll();
        System.out.println(list);
        return "success";
    }

    @RequestMapping("/add")
    public String add(Account account) {
        Integer i = accountService.addAccount(account);
        System.out.println(i);
        return "success";
    }
}

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

    <!--包扫描-->
    <!--<context:component-scan base-package="com.zl"></context:component-scan>-->
    <!--包扫描冲突 解决1 改springmvc.xml包扫描,只扫控制器-->
    <!--包扫描冲突 解决2 改spring.xml包扫描-->
    <context:component-scan base-package="com.zl" use-default-filters="false">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"></context:include-filter>
    </context:component-scan>
    <!--mvc：注解驱动-->
    <mvc:annotation-driven></mvc:annotation-driven>
    <!--内部资源视图解析器，对象-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/pages/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <!--静态资源处理-->
    <mvc:default-servlet-handler></mvc:default-servlet-handler>
    <!--包扫描冲突 方法二，导入spring.xml 如果有了这个配置，可以不用在web.xml中配置容器加载监听器-->
    <!--<import resource="spring.xml"></import>-->
</beans>

集成Spring

集成Spring和SpringMVC，只需要创建SpringIOC容器即可，SpringMVCIOC容器会自动将SpringIOC容器设置为自己的父容器。

包扫描冲突解决

如果不做处理会导致事务处理失效

两种处理方式：spring.xml与springmvc.xml分别只扫描对应部分，注意要配置容器加载监听器；或者全交由子类容器springmvc.xml来扫描，注意要导入

集成MyBatis

package com.zl.service;

import com.bean.Account;
import java.util.List;

public interface AccountService {

    List<Account> findAll();

    Integer addAccount(Account account);
}

package com.zl.service.impl;

import com.bean.Account;
import com.zl.mapper.AccountMapper;
import com.zl.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;

import java.util.List;
@Service
public class AccountServiceImpl  implements AccountService {
    //@Autowired
    @Resource  //减少与spring的耦合
    private AccountMapper accountMapper;
    @Override
    public List<Account> findAll() {
        System.out.println("com.zl.service.impl.AccountServiceImpl#findAll");
        return accountMapper.findAll();
    }

    @Override
    public Integer addAccount(Account account) {
        System.out.println("com.zl.service.impl.AccountServiceImpl#addAccount");
        Integer i = accountMapper.addAccount(account);
        //System.out.println(10/0);
        return i;
    }
}

package com.zl.mapper;

import com.bean.Account;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;

import java.util.List;

public interface AccountMapper {
    @Select("select * from account")
    List<Account> findAll();
    @Insert("insert into account (name,money) values(#{name},#{money})")
    Integer addAccount(Account account);
}

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:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:util="http://www.springframework.org/schema/util"
       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
       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.xsd
       http://www.springframework.org/schema/util
       http://www.springframework.org/schema/util/spring-util.xsd">

    <!--Spring加载Properties配置文件的方式-->
    <!--通过 util:properties 标签实现配置文件加载-->
    <!--<util:properties id="util_spring" local-override="true" location="classpath:jdbc.properties"/>-->
    <!--通过 PropertyPlaceholderConfigurer 类读取配置文件-->
    <bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>
            </list>
        </property>
    </bean>
    
    <!--以前的bean配置文件,创建service bean对象的-->
    <!--配置注解包扫描创建对象-->
    <!--<context:component-scan base-package="com.zl"></context:component-scan>-->
    <!--包扫描冲突 方法一解决1 改springmvc.xml包扫描-->
    <!--包扫描冲突 方法一解决2 改spring.xml包扫描，不扫控制器（扫service与dao）-->
    <context:component-scan base-package="com.zl" use-default-filters="true">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"></context:exclude-filter>
    </context:component-scan>

    <!--配置mybatis三部曲-->
    <!--配置数据源连接池，连上数据库服务器-->
    <bean class="com.mchange.v2.c3p0.ComboPooledDataSource" id="dataSource">
        <property name="driverClass" value="${driver}"></property>
        <property name="jdbcUrl" value="${url}"></property>
        <property name="user" value="${username}"></property>
        <property name="password" value="${password}"></property>
       <!-- <property name="driverClass" value="#{util_spring['driver']}"></property>
        <property name="jdbcUrl" value="#{util_spring['url']}"></property>
        <property name="user" value="#{util_spring['username']}"></property>
        <property name="password" value="#{util_spring['password']}"></property>-->
    </bean>
    <!--配置工厂对象拿到session-->
    <!--SqlSessionFactoryBean主要取代了之前SqlSessionFactory的相关操作-->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="factoryBean">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!--配置mapper扫描-->
    <!--MapperScannerConfigurer主要是取代之前的bean.xml中mappers配置，指定mapper接口的包路径-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.zl.mapper"></property>
    </bean>

    <!--事务控制-->
    <bean class="org.springframework.jdbc.datasource.DataSourceTransactionManager" id="transactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    <tx:advice transaction-manager="transactionManager" id="txadvice">
        <tx:attributes>
            <tx:method name="findAll" read-only="true"/>
            <tx:method name="addAccount" propagation="REQUIRED" rollback-for="java.lang.Exception"/>
        </tx:attributes>
    </tx:advice>
    <aop:config>
        <aop:advisor advice-ref="txadvice" pointcut="execution(* com.zl.service.impl.AccountServiceImpl.*(..))"></aop:advisor>
    </aop:config>
</beans>