04-SSM framework integration

04-SSM framework integration

Database environment construction

-- auto-generated definition
create table t_emp
(
    emp_id   int auto_increment
        primary key,
    emp_name varchar(20) null,
    age      int         null,
    gender   char        null,
    email varchar(50)         null
)comment '员工表' auto_increment = 34;

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">
    <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>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <servlet>
        <servlet-name>SpringMVC</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>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>SpringMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:spring.xml</param-value>
    </context-param>

</web-app>

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>
        <!-- 驼峰 -->
        <setting name="mapUnderscoreToCamelCase" value="true"/>

        <!-- 开启二级缓存 -->
        <setting name="lazyLoadingEnabled" value="true"/>
        <setting name="aggressiveLazyLoading" value="false"/>


        <!-- 开启日志输出 ：根据 2.7, 2.8 自行选择想要的日志 -->
<!--        <setting name="logImpl" value="STDOUT_LOGGING"/>-->
        <setting name="logImpl" value="LOG4J"/>
<!--        <setting name="logImpl" value="SLF4J"/>-->
    </settings>

    <plugins>
        <!-- 设置分页插件 -->
        <plugin interceptor="com.github.pagehelper.PageInterceptor"/>
    </plugins>
</configuration>

log4j.properties

log4j.rootLogger=debug, stdout, R

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern to output the caller's file name and line number.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=example.log

log4j.appender.R.MaxFileSize=100KB
# Keep one backup file
log4j.appender.R.MaxBackupIndex=5

log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n

db.properties

jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=false&serverTimezone=Asia/Shanghai&characterEncoding=utf-8&autoReconnect=true
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.user=root
jdbc.password=123456
jdbc.filters=stat
jdbc.initialSize=2
jdbc.maxActive=300
jdbc.maxWait=60000
jdbc.timeBetweenEvictionRunsMillis=60000
jdbc.minEvictableIdleTimeMillis=300000
jdbc.validationQuery=SELECT 1
jdbc.testWhileIdle=true
jdbc.testOnBorrow=false
jdbc.testOnReturn=false
jdbc.poolPreparedStatements=false
jdbc.maxPoolPreparedStatementPerConnectionSize=200

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:util="http://www.springframework.org/schema/util"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
       http://www.springframework.org/schema/util
       https://www.springframework.org/schema/util/spring-util.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <context:component-scan base-package="com.XZY_SUNSHINE">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
    <context:property-placeholder location="classpath:db.properties"/>
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
        <property name="url" value="${jdbc.url}"/>
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="username" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="initialSize" value="${jdbc.initialSize}" />
        <property name="maxActive" value="${jdbc.maxActive}" />
        <property name="maxWait" value="${jdbc.maxWait}" />
        <property name="filters" value="${jdbc.filters}" />
        <property name="timeBetweenEvictionRunsMillis" value="${jdbc.timeBetweenEvictionRunsMillis}" />
        <property name="minEvictableIdleTimeMillis" value="${jdbc.minEvictableIdleTimeMillis}" />
        <property name="validationQuery" value="${jdbc.validationQuery}" />
        <property name="testWhileIdle" value="${jdbc.testWhileIdle}" />
        <property name="testOnBorrow" value="${jdbc.testOnBorrow}" />
        <property name="testOnReturn" value="${jdbc.testOnReturn}" />
        <property name="poolPreparedStatements" value="${jdbc.poolPreparedStatements}" />
        <property name="maxPoolPreparedStatementPerConnectionSize"
                  value="${jdbc.maxPoolPreparedStatementPerConnectionSize}" />
    </bean>

    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <tx:annotation-driven transaction-manager="transactionManager"/>
    <bean class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <property name="dataSource" ref="dataSource"/>
        <property name="typeAliasesPackage" value="com.XZY_SUNSHINE.pojo"/>
<!--        <property name="mapperLocations" value="classpath:mappers/*.xml"/>-->
    </bean>
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.XZY_SUNSHINE.Mapper"/>
    </bean>
</beans>

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:util="http://www.springframework.org/schema/util"
       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-4.0.xsd
       http://www.springframework.org/schema/util
       https://www.springframework.org/schema/util/spring-util.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!-- 包扫描 -->
    <context:component-scan base-package="com.XZY_SUNSHINE.Controller"/>


    <!-- 配置 Thymeleaf 视图解析器 配置完毕后可以使用MVC的方式完成视图渲染和跳转了 -->
    <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="HTML"/>
                        <property name="characterEncoding" value="UTF-8"/>
                    </bean>
                </property>
            </bean>
        </property>
    </bean>

    <!-- 处理静态资源 -->
    <mvc:default-servlet-handler />

    <!-- 开启注解驱动
         @ControllerAdvice
         @ResponseBody
         @RequestBody
         ....
    -->
    <mvc:annotation-driven />

    <!-- 配置视图控制器 -->
    <mvc:view-controller path="/" view-name="index"/>
</beans>

poo

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Employee {
    
    
    private int empId;
    private String empName;
    private int age;
    private String gender;
    private String email;
}

Mapper

mapper.java

public interface EmployeeMapper {
    
    

    List<Employee> getEmloyee();
}

mapper.xml

<?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.XZY_SUNSHINE.Mapper.EmployeeMapper">

    <!-- List<Employee> getAll(); 下划线不用处理，小驼峰配置已经开启-->
    <select id="getEmloyee" resultType="Employee">
        SELECT * FROM ssmbuild.t_emp
    </select>

</mapper>

service

service.java

public interface EmployeeService {
    
    
    List<Employee> getEmployee();
}

serviceImpl.java

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

    @Override
    public List<Employee> getEmployee() {
    
    
        return employeeMapper.getEmloyee();
    }
}

Controller

@Controller
public class EmpController {
    
    
    @Autowired
    private EmployeeService employeeService;
    @RequestMapping("/employee")
    public String getEmployee(Model model){
    
    
        List<Employee> list=employeeService.getEmployee();
        model.addAttribute("list",list);
        return "employee_list";
    }
}