Java SSM配置文件案例详解

先对Spring SpringMVC和Mybatis单独进行配置，最后对三者进行整合配置

Spring

实际使用中，一般会使用注解+xml配置来实现spring功能，其中xml配置对上文进行总结，配置内容如下

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									<?xml version="1.0" encoding="UTF-8"?>

									<!--在使用spring 相关jar包的时候进行配置 每个jar包对应一个xmlns和schemaLocation路径-->

									<!--格式基本相关 只要修改相关的关键字-->

									<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"

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

									<!--    开启注解扫描 ，才可以使用注解 可以使用use-default-filter配合include-filer和exclude-filter使用    -->

									    <context:component-scan base-package="com.jdbcTemplate" ></context:component-scan>

									<!--    开启aop-->

									    <aop:aspectj-autoproxy></aop:aspectj-autoproxy>

									<!--    JdbcTemplate使用-->

									    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">

									        <property name="url" value="jdbc:mysql:/book"/>

									        <property name="username" value = "root"/>

									        <property name="password" value = "LRY990722"/>

									        <property name="driverClassName" value="com.mysql.jdbc.Driver"/>

									    </bean>

									    <bean id="'jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">

									        <property name="dataSource" ref="dataSource"></property>

									    <bean/>

									    <!--创建事务管理器-->

									    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">

									    <!--注入数据源-->

									    <property name="dataSource" ref="dataSource"></property>

									        <!--开启事务注解-->

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

									</bean>

									</beans>

springMVC

web.xml配置文件

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									<!-- 配置SpringMVC的前端控制器，对浏览器发送的请求统一进行处理 -->

									<servlet>

									    <servlet-name>springMVC</servlet-name>

									    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

									    <!-- 通过初始化参数指定SpringMVC配置文件的位置和名称 -->

									    <init-param>

									        <!-- contextConfigLocation为固定值 -->

									        <param-name>contextConfigLocation</param-name>

									        <!-- 使用classpath:表示从类路径查找配置文件，例如maven工程中的src/main/resources -->

									        <param-value>classpath:springMVC.xml</param-value>

									    </init-param>

									    <!-- 

									        作为框架的核心组件，在启动过程中有大量的初始化操作要做

									        而这些操作放在第一次请求时才执行会严重影响访问速度

									        因此需要通过此标签将启动控制DispatcherServlet的初始化时间提前到服务器启动时

									    -->

									    <load-on-startup>1</load-on-startup>

									</servlet>

									<servlet-mapping>

									    <servlet-name>springMVC</servlet-name>

									    <!--

									        设置springMVC的核心控制器所能处理的请求的请求路径

									        /所匹配的请求可以是/login或.html或.js或.css方式的请求路径

									        但是/不能匹配.jsp请求路径的请求

									    -->

									    <url-pattern>/</url-pattern>

									</servlet-mapping>

springMVC.xml配置文件

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									<!-- 自动扫描包 -->

									<context:component-scan base-package="com.atguigu.mvc.controller"/>

									<!-- 配置Thymeleaf视图解析器 -->

									<bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver">

									    <property name="order" value="1"/>

									    <property name="characterEncoding" value="UTF-8"/>

									    <property name="templateEngine">

									        <bean class="org.thymeleaf.spring5.SpringTemplateEngine">

									            <property name="templateResolver">

									                <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver">

									                    <!-- 视图前缀 -->

									                    <property name="prefix" value="/WEB-INF/templates/"/>

									                    <!-- 视图后缀 -->

									                    <property name="suffix" value=".html"/>

									                    <property name="templateMode" value="HTML5"/>

									                    <property name="characterEncoding" value="UTF-8" />

									                </bean>

									            </property>

									        </bean>

									    </property>

									</bean>

									<!-- 

									   处理静态资源，例如html、js、css、jpg

									  若只设置该标签，则只能访问静态资源，其他请求则无法访问

									  此时必须设置<mvc:annotation-driven/>解决问题

									 -->

									<mvc:default-servlet-handler/>

									<!-- 开启mvc注解驱动 -->

									<mvc:annotation-driven>

									    <mvc:message-converters>

									        <!-- 处理响应中文内容乱码 -->

									        <bean class="org.springframework.http.converter.StringHttpMessageConverter">

									            <property name="defaultCharset" value="UTF-8" />

									            <property name="supportedMediaTypes">

									                <list>

									                    <value>text/html</value>

									                    <value>application/json</value>

									                </list>

									            </property>

									        </bean>

									    </mvc:message-converters>

									</mvc:annotation-driven>

Mybatis

Mybatis-config.xml中配置文件

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									<?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>

									    <environments default="development">

									        <environment id="development">

									            <transactionManager type="JDBC"/>

									            <dataSource type="POOLED">

									                <property name="driver" value="com.mysql.jdbc.Driver"/>

									                <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=utf8"/>

									                <property name="username" value="root"/>

									                <property name="password" value="LRY990722"/>

									            </dataSource>

									        </environment>

									    </environments>

									<!--    mapper.xml都需要在mybatis核心配置文件中配置-->

									    <mappers>

									        <mapper resource="com/example/mapper/UserMapper.xml"/>

									    </mappers>

									</configuration>

mapper.xml中配置文件如下：

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									<?xml version="1.0" encoding="UTF-8" ?>

									<!DOCTYPE mapper

									        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

									        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

									<mapper namespace="com.example.mapper.UserMapper">

									    <select id="selectUser" resultType="com.example.pojo.User">

									        select * from user

									    </select>

									</mapper>

有时候读取不到mapperl.xml配置的原因，提示java.io.IOException: Could not find resource，原因可能有
1）配置文件是否在Resource路径下；

2）如果在src/main/java目录下，需要在项目的pom.xml中加入；

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									<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>