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SSM整合

发布于 2022-07-26 | 标签: Mybatis 、 Spring 、 Java | 26分钟 | 4606字数 | 浏览量::

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SSM整合

1、ContextLoaderListener

Spring提供了监听器ContextLoaderListener，实现ServletContextListener接口，可监听 ServletContext 的状态，在web服务器的启动，读取Spring的配置文件，创建Spring的IOC容器。web 应用中必须在web.xml中配置

<!--
    配置Spring的监听器，在服务器启动时加载Spring的配置文件
    Spring配置文件默认位置和名称：/WEB-INF/applicationContext.xml
    可通过上下文参数自定义Spring配置文件的位置和名称
 -->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<!-- 设置Spring的配置文件的位置和名称 -->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:Spring.xml</param-value>
</context-param>

2、准备工作

①创建Maven Module

②导入依赖

<packaging>war</packaging>

<properties>
    <spring.version>5.3.1</spring.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <!--springmvc-->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
        <version>${spring.version}</version>
    </dependency>
    <!-- Mybatis核心 -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.7</version>
    </dependency>
    <!--mybatis和spring的整合包-->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.6</version>
    </dependency>
    <!-- druid连接池 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.9</version>
    </dependency>
    <!-- junit测试 -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
    <!-- MySQL驱动 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.38</version>
    </dependency>
    <!-- log4j日志 -->
    <dependency>
        <groupId>log4j</groupId>
        <artifactId>log4j</artifactId>
        <version>1.2.17</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper -->
    <dependency>
        <groupId>com.github.pagehelper</groupId>
        <artifactId>pagehelper</artifactId>
        <version>5.2.0</version>
    </dependency>
    <!-- 日志 -->
    <dependency>
        <groupId>ch.qos.logback</groupId>
        <artifactId>logback-classic</artifactId>
        <version>1.2.3</version>
    </dependency>
    <!-- ServletAPI -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.12.1</version>
    </dependency>
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.1</version>
    </dependency>
    <!-- Spring5和Thymeleaf整合包 -->
    <dependency>
        <groupId>org.thymeleaf</groupId>
        <artifactId>thymeleaf-spring5</artifactId>
        <version>3.0.12.RELEASE</version>
    </dependency>
</dependencies>

③创建表

CREATE TABLE `t_emp`(
    `emp_id`   int(11) NOT NULL AUTO_INCREMENT,
    `emp_name` varchar(20) DEFAULT NULL,
    `age`      int(11) DEFAULT NULL,
    `sex`      char(1)     DEFAULT NULL,
    `email`    varchar(50) DEFAULT NULL,
    PRIMARY KEY (`emp_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

3、配置web.xml

<!--配置springMVC的编码过滤器-->
<filter>
    <filter-name>CharacterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <!--如果只设置encoding参数则编码过滤器只对请求request生效-->
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
    </init-param>
    <!--设置forceResponseEncoding参数为true，编码过滤器才对响应respose生效-->
    <init-param>
        <param-name>forceResponseEncoding</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>CharacterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<!-- 配置处理请求方式PUT和DELETE的过滤器 -->
<filter>
    <filter-name>HiddenHttpMethodFilter</filter-name>
    <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>HiddenHttpMethodFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

<!-- 配置SpringMVC的前端控制器 -->
<servlet>
    <servlet-name>dispatcherServlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <!-- 设置SpringMVC的配置文件的位置和名称 -->
    <init-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:SpringMVC.xml</param-value>
    </init-param>
    <!-- 将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>dispatcherServlet</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

<!-- 配置Spring的监听器 -->
<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<!-- 设置Spring的配置文件的位置和名称 -->
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:Spring.xml</param-value>
</context-param>

4、创建SpringMVC的配置文件并配置

<!--扫描控制层组件-->
<context:component-scan base-package="com.atguigu.controller"></context:component-scan>

<!--配置视图解析器-->
<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>

<!-- 配置默认的servlet处理静态资源 -->
<mvc:default-servlet-handler/>

<!-- 开启MVC的注解驱动 -->
<mvc:annotation-driven/>

<!-- 配置访问首页的视图控制器 -->
<mvc:view-controller path="/" view-name="index"></mvc:view-controller>

<!-- 处理CORS -->
<mvc:cors>
    <!--
        allowed-origins: <origin> | *
        其中，origin 参数的值指定允许访问该资源的外域 origin 域名。
        对于不需要携带身份凭证的请求，服务器可以指定该字段的值为通配符*，表示允许来自所有域的请求。
    -->
    <!--<mvc:mapping path="/**" allowed-origins="http:/z/example.com/" allowed-methods="GET,POST" max-age="3600"/>-->
    <!--
        allowed-origin-patterns
        替代llowed-origins，此属性允许更灵活的模式，例如 *.domain1.com
    -->
    <mvc:mapping path="/**" allowed-origin-patterns="http://localhost:*" allowed-methods="GET,POST" max-age="3600"/>
</mvc:cors>

5、搭建MyBatis环境

①创建属性文件jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
#jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3305/mydb?characterEncoding=utf8&useUnicode=true&useSSL=false
# jdbc.url=jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC
jdbc.username=root
jdbc.password=

②创建MyBatis的核心配置文件mybatis-config.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>
    <settings>
        <!--将表中字段的下划线自动转换为驼峰-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>
        <!--开启延迟加载-->
        <setting name="lazyLoadingEnabled" value="true"/>
    </settings>
    <!--设置类型别名-->
    <typeAliases>
        <package name="com.atguigu.pojo"/>
    </typeAliases>

    <plugins>
        <!--设置分页插件-->
        <plugin interceptor="com.github.pagehelper.PageInterceptor">
            <!--reasonable：分页合理化参数，默认值为false,直接根据参数进行查询。
              当该参数设置为 true 时，pageNum<=0 时会查询第一页， pageNum>pages（超过总数时），会查询最后一页。-->
            <property name="reasonable" value="true"/>
            <property name="pageSizeZero" value="true"/>
        </plugin>
    </plugins>

    <!--引入映射文件-->
    <mappers>
        <!--        <mapper resource="mybatisdemo/mappers/UserMapper.xml"/>-->
        <!--
        以包为单位，将包下所有的映射文件引入核心配置文件
        注意：
			1. 此方式必须保证mapper接口和mapper映射文件必须在相同的包下
			2. mapper接口要和mapper映射文件的名字一致
			<package name="com.example.mybatis.mapper"/>
        -->
        <package name="com.atguigu.mapper"/>
    </mappers>
</configuration>

③创建Mapper接口和映射文件

public interface EmployeeMapper {
    List<Employee> getEmployeeList();
}

<?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.atguigu.ssm.mapper.EmployeeMapper">
    
    <select id="getEmployeeList" resultType="Employee">
        select *
        from t_emp
    </select>
    
</mapper>

  • 关于mapper映射文件的位置一般有两种写法：

    • a. MyBatis映射文件存放的位置是src/main/resources/mappers目录下

    • b. 将MyBatis映射文件存放到src/main/java同一目录下，

      • 此时需要在pom.xml中手动指定映射文件的存放位置，因为这样Maven才会编译这些xml

        <build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.xml</include>
            </includes>
        </resource>
    </resources>
</build>

      • 在mybatis中配置映射文件的存放位置

        <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="configLocation" value="classpath:mybatis-config.xml"></property>
    <property name="dataSource" ref="druidDataSource"></property>
    <!--
     设置映射文件的路径
     只有映射文件的包和mapper接口的包不一致时需要设置
     -->
    <property name="mapperLocations" value="classpath:com/xxxxx/mapper/xml/*.xml"></property>
</bean>

④创建日志文件log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender">
        <param name="Encoding" value="UTF-8"/>
        <layout class="org.apache.log4j.PatternLayout">
            <param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m (%F:%L) \n"/>
        </layout>
    </appender>
    <logger name="java.sql">
        <level value="debug"/>
    </logger>
    <logger name="org.apache.ibatis">
        <level value="info"/>
    </logger>
    <root>
        <level value="debug"/>
        <appender-ref ref="STDOUT"/>
    </root>
</log4j:configuration>

6、创建Spring的配置文件并配置

<!--扫描组件（除控制层）-->
<content:component-scan base-package="com.atguigu">
    <content:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
</content:component-scan>

<!-- 引入jdbc.properties -->
<content:property-placeholder location="classpath:jdbc.properties"></content:property-placeholder>

<!-- 配置Druid数据源 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
    <property name="driverClassName" value="${jdbc.driver}"></property>
    <property name="url" value="${jdbc.url}"></property>
    <property name="username" value="${jdbc.username}"></property>
    <property name="password" value="${jdbc.password}"></property>
</bean>

<!-- 配置用于创建SqlSessionFactory的工厂bean，可以直接在Spring的IOC中获取SqlSessionFactory -->
<bean class="org.mybatis.spring.SqlSessionFactoryBean">
    <!-- 设置MyBatis核心配置文件的路径（可以不设置） -->
    <property name="configLocation" value="classpath:mybatis-config.xml">
    </property>
    <!-- 设置数据源 -->
    <property name="dataSource" ref="dataSource"></property>
    <!--
     设置映射文件的路径
     只有映射文件的包和mapper接口的包不一致时需要设置
     -->
    <!--
    <property name="mapperLocations" value="classpath:mapper/*.xml">
    </property>
    -->
</bean>

<!--
    配置mapper接口的扫描
    可以将指定包下所有的mapper接口通过SqlSessionFactory创建动态代理实现类对象
    并将这些对象作为bean交给IOC容器管理
-->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="com.atguigu.mapper"></property>
</bean>

<!--配置事务管理器-->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
</bean>

<!--
开启事务的注解驱动
通过注解@Transactional所标识的方法或标识的类中所有的方法，都会被事务管理器管理事务
-->
<!--
 transaction-manager属性的默认值是transactionManager，
 如果事务管理器bean的id正好就是这个默认值，则可以省略这个属性
-->
<tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven>

7、测试功能

①创建组件

实体类Employee

public class Employee {

    private Integer empId;
    private String empName;
    private Integer age;
    private String sex;
    private String email;

    public Employee() {
    }

    public Employee(Integer empId, String empName, Integer age, String sex, String email) {
        this.empId = empId;
        this.empName = empName;
        this.age = age;
        this.sex = sex;
        this.email = email;
    }

    public Integer getEmpId() {
        return empId;
    }

    public void setEmpId(Integer empId) {
        this.empId = empId;
    }

    public String getEmpName() {
        return empName;
    }

    public void setEmpName(String empName) {
        this.empName = empName;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "empId=" + empId +
                ", empName='" + empName + '\'' +
                ", age=" + age +
                ", sex='" + sex + '\'' +
                ", email='" + email + '\'' +
                '}';
    }
}

创建控制层组件EmployeeController

@Controller
public class EmployeeController {
    @Autowired
    private EmployeeService employeeService;

    @RequestMapping(value = "/employee/page/{pageNum}", method =
            RequestMethod.GET)
    public String getEmployeeList(Model model, @PathVariable("pageNum") Integer
            pageNum) {
        PageInfo<Employee> page = employeeService.getEmployeeList(pageNum);
        model.addAttribute("page", page);
        return "employee_list";
    }
}

创建接口EmployeeService

public interface EmployeeService {
    PageInfo<Employee> getEmployeeList(Integer pageNum);
}

创建实现类EmployeeServiceImpl

@Service
public class EmployeeServiceImpl implements EmployeeService {
    @Autowired
    private EmployeeMapper employeeMapper;

    @Override
    public PageInfo<Employee> getEmployeeList(Integer pageNum) {
        PageHelper.startPage(pageNum, 4);
        List<Employee> list = employeeMapper.getEmployeeList();
        PageInfo<Employee> page = new PageInfo<>(list, 5);
        return page;
    }
}

②创建页面

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Employee Info</title>
    <link rel="stylesheet" th:href="@{/static/css/index_work.css}">
</head>
<body>
<table>
    <tr>
        <th colspan="6">Employee Info</th>
    </tr>
    <tr>
        <th>emp_id</th>
        <th>emp_name</th>
        <th>age</th>
        <th>sex</th>
        <th>email</th>
        <th>options</th>
    </tr>
    <tr th:each="employee : ${page.list}">
        <td th:text="${employee.empId}"></td>
        <td th:text="${employee.empName}"></td>
        <td th:text="${employee.age}"></td>
        <td th:text="${employee.sex}"></td>
        <td th:text="${employee.email}"></td>
        <td>
            <a href="">delete</a>
            <a href="">update</a>
        </td>
    </tr>
    <tr>
        <td colspan="6">
             <span th:if="${page.hasPreviousPage}">
                    <a th:href="@{/employee/page/1}">首页</a>
                    <a th:href="@{'/employee/page/'+${page.prePage}}">上一页</a>
             </span>
            <span th:each="num : ${page.navigatepageNums}">
                    <a th:if="${page.pageNum==num}"
                       th:href="@{'/employee/page/'+${num}}" th:text="'['+${num}+']'" style="color:
                    red;"></a>
                    <a th:if="${page.pageNum!=num}"
                       th:href="@{'/employee/page/'+${num}}" th:text="${num} "></a>
            </span>
            <span th:if="${page.hasNextPage}">
                    <a th:href="@{'/employee/page/'+${page.nextPage}}">下一页</a>
                    <a th:href="@{'/employee/page/'+${page.pages}}">末页</a>
            </span>
        </td>
    </tr>
</table>
</body>
</html>

③访问测试分页功能

localhost:8080/employee/page/1

8、加入Druid监控

①创建属性文件druid.properties

#连接池建立时创建的初始化连接数
pool.init=1
#连接池中最小空闲连接数
pool.minIdle=3
#连接池中最大的活跃连接数
pool.maxActive=20
#定义最长等待时间
pool.maxWait=60000

②在Spring配置文件中为Druid数据源添加相应的属性

<!-- 引入jdbc.properties和druid.properties -->
<content:property-placeholder location="classpath:jdbc.properties,classpath:druid.properties"></content:property-placeholder>

<!-- 配置Druid数据源 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
    <property name="driverClassName" value="${jdbc.driver}"></property>
    <property name="url" value="${jdbc.url}"></property>
    <property name="username" value="${jdbc.username}"></property>
    <property name="password" value="${jdbc.password}"></property>
    <!--数据源控制属性-->
    <!-- 配置初始化大小、最小、最大 -->
    <property name="initialSize" value="${pool.init}"/>
    <property name="minIdle" value="${pool.minIdle}"/>
    <property name="maxActive" value="${pool.maxActive}"/>
    <!-- 配置获取连接等待超时的时间 -->
    <property name="maxWait" value="${pool.maxWait}"/>
    <!-- 配置监控统计拦截的filters -->
    <property name="filters" value="stat"/>
    <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
    <property name="timeBetweenEvictionRunsMillis" value="2000"/>
    <!--其他配置-->
    <property name="minEvictableIdleTimeMillis" value="300000"/>
    <property name="testWhileIdle" value="true"/>
    <property name="testOnBorrow" value="false"/>
    <property name="testOnReturn" value="false"/>
    <property name="poolPreparedStatements" value="true"/>
    <property name="maxOpenPreparedStatements" value="20"/>
</bean>

③在web.xml中配置监控页面

<!-- druid监控配置-->
<!-- 参考文档：https://github.com/alibaba/druid/wiki/%E9%85%8D%E7%BD%AE_StatViewServlet%E9%85%8D%E7%BD%AE -->
<servlet>
    <servlet-name>DruidStatView</servlet-name>
    <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
    <init-param>
        <!-- 允许清空统计数据 -->
        <param-name>resetEnable</param-name>
        <param-value>true</param-value>
    </init-param>
    <!--配置访问监控页面登录的用户名和密码（可选），实际开发中都会配置-->
    <init-param>
        <!-- 用户名 -->
        <param-name>loginUsername</param-name>
        <param-value>druid</param-value>
    </init-param>
    <init-param>
        <!-- 密码 -->
        <param-name>loginPassword</param-name>
        <param-value>druid</param-value>
    </init-param>
</servlet>

<servlet-mapping>
    <servlet-name>DruidStatView</servlet-name>
    <!-- 访问监控页面的映射请求，实际访问一般都在浏览器输入http://xxx/druid/index -->
    <url-pattern>/druid/*</url-pattern>
</servlet-mapping>
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