The three basic frameworks of JavaWeb-the basic function of CRUD

Introduction

The front end of the project uses bootstrap, and the back end is the three major frameworks of ssm

note

This is the basic architecture of the project.

Several configurations should be paid attention to: applicationContext.xml, mybatis.xml, web.xml, pom.xml
. The pojo code uses the lombok plug-in, and the front-end paging uses the
applicationContext.xml necessary for pagehelp (this is The core of spring, I have integrated spring, springmvc and part of mybatis code in it)

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

    <!-- 配置整合mybatis -->
    <!-- 1.关联数据库文件 -->
    <context:property-placeholder location="classpath:database.properties"/>

    <!-- 2.数据库连接池 -->
    <!--数据库连接池
    dbcp 半自动化操作 不能自动连接
    c3p0 自动化操作（自动的加载配置文件 并且设置到对象里面）
    -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <!-- 配置连接池属性 -->
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!-- 3.配置SqlSessionFactory对象 -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!-- 4.配置扫描Dao接口包，动态实现Dao接口注入到spring容器中 -->
    <!--解释 ： https://www.cnblogs.com/jpfss/p/7799806.html-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 注入sqlSessionFactory -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!-- 给出需要扫描Dao接口包 -->
        <property name="basePackage" value="com.yishuai.dao"/>
    </bean>

    <!--    整合service-->
    <!-- 扫描service相关的bean -->
    <context:component-scan base-package="com.yishuai.service"/>
    <!--BookServiceImpl注入到IOC容器中-->
    <bean id="userServiceImpl" class="com.yishuai.service.UserServiceImpl">
        <property name="userMapper" ref="userMapper"/>
    </bean>
    <bean id="empServiceImpl" class="com.yishuai.service.EmpServiceImpl">
        <property name="empMapper" ref="empMapper"/>
    </bean>
    <bean id="deptServiceImpl" class="com.yishuai.service.DeptServiceImpl">
        <property name="deptMapper" ref="deptMapper"/>
    </bean>

    <!-- 配置事务管理器 -->
    <bean id="transactionManager"
          class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!-- 注入数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 配置SpringMVC -->
    <!-- 1.开启SpringMVC注解驱动 -->
    <mvc:annotation-driven/>
    <!-- 2.静态资源默认servlet配置-->
    <mvc:default-servlet-handler/>
    <!-- 3.配置jsp 显示ViewResolver视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!-- 4.扫描web相关的bean -->
    <context:component-scan base-package="com.yishuai.controller"/>
</beans>

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>
    <!--    驼峰命名-->
    <settings>
        <setting name="mapUnderscoreToCamelCase" value="true"/>
    </settings>
    <!--    设置别名-->
    <typeAliases>
        <package name="com.yishuai.pojo"/>
    </typeAliases>

    <plugins>
        <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"/>
        </plugin>
    </plugins>

</configuration>

database.properties
ssmcrud is the name of the database,
followed by password is the password, modify it yourself

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmcrud?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456a

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">
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <!--一定要注意:我们这里加载的是总的配置文件，之前被这里坑了！-->
            <param-value>classpath:applicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!--encodingFilter-->
    <filter>
        <filter-name>encodingFilter</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>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--Session过期时间-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>
</web-app>

Most of the configuration is placed in the applicationContext, if necessary, you can put nothing in mybatis-config, only the header file, and the rest are configured in the applicationContext

• Resource filtering must be configured in pom, otherwise xml and other files cannot be packaged, and an error must be reported! *
• The dao layer stores the interface, the service places the page, and the impl is the implementation class, which is mainly called by the controller layer, and the filter and utils are developed on demand

When the project is imported, you need to change to your own jdk and repair the models
above:
Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Concluding remarks

Save, and then just click the green run.

The architecture that contains such clear comments is not easy to use and cherish. The
front-end page, back-end logic code, and the resources used are all put in the compressed package.
The first choice for review and learning. The
database is packaged together. The
link is unlimited. Lan Zouyun~

Click me to download
https://www.lanzous.com/iLTSSkr7n0h