SSM framework integration (2): web project of maven module

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engineering structure

Using the maven project, the project structure is as follows:

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1. SSM integration

1. Import library

The pom file of the parent project

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.mediacomm</groupId>
    <artifactId>project_ssm_adminlte</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>ssm_dao</module>
        <module>ssm_domain</module>
        <module>ssm_service</module>
        <module>ssm_utils</module>
        <module>ssm_webapp</module>
    </modules>
    <properties>
        <lombok.version>1.18.12</lombok.version>
        <spring.version>5.0.2.RELEASE</spring.version>
        <slf4j.version>1.6.6</slf4j.version>
        <log4j.version>1.2.12</log4j.version>
        <mybatis.version>3.4.5</mybatis.version>
        <spring.security.version>5.0.1.RELEASE</spring.security.version>
        <mysql.version>5.1.6</mysql.version>
    </properties>

    <dependencies>
    	<!--用途：为实体类的属性创建get、set和toString方法-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
            <scope>provided</scope>
        </dependency>

		<!--用途：切入点表达式-->
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.6.8</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</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-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>        <!-- log start -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>        <!-- log end -->

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>
        <!--用途：数据库连接池-->
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <!--用途：数据库分页查询-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>
        
        <dependency>
            <groupId>javax.annotation</groupId>
            <artifactId>jsr250-api</artifactId>
            <version>1.0</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>jstl</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>        <!-- log start -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>${log4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>${slf4j.version}</version>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>${slf4j.version}</version>
        </dependency>        <!-- log end -->

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>
        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.1.2</version>
            <type>jar</type>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.1.2</version>
        </dependency>

        <dependency>
            <groupId>javax.annotation</groupId>
            <artifactId>jsr250-api</artifactId>
            <version>1.0</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.9.0</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.0</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>2.9.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>
    </dependencies>

</project>

2. ssm_webapp project structure

3. Configure Spring MVC

1. Create a request control class

@Controller
@RequestMapping("/orders")
public class OrderController {
    
    
    @RequestMapping("/findById.do")
    public ModelAndView findOrder(@RequestParam(name = "id") String id) throws MyException{
    
    
        ModelAndView mv = new ModelAndView();
        try{
    
    
            Order order = orderService.findOrderById(id);
            mv.addObject("orders",order);
            mv.setViewName("orders-desc");
        }catch (Exception e){
    
    
            e.printStackTrace();
            throw new MyException("查询订单详情失败");
        }
        return mv;
    }

2. In ssm_webapp, create a SpringMVC configuration file in the resource, as follows:

<?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
        https://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">

	<!--springmvc注解扫描-->
    <context:component-scan base-package="com.mediacomm.controller">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>
	<!--响应视图-->
    <bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/pages/"></property>
        <property name="suffix" value=".jsp"/>
    </bean>
    
    <!--我自定的类型转换器MVCDateConverter-->
    <bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean">
        <property name="converters">
            <array>
                <bean class="com.mediacomm.converter.MVCDateConverter"></bean>
            </array>
        </property>
    </bean>
    
    <!--异常处理器-->
    <bean id="dxceptionResolver" class="com.mediacomm.exceptionresolver.ExceptionResolver"></bean>
	
	<!--静态资源过滤，指定哪些资源不会被springmvc的dispatcher拦截-->
    <mvc:resources mapping="/js/**" location="/js/"/>
    <mvc:resources mapping="/css/**" location="/css/"/>
    <mvc:resources mapping="/img/**" location="/img/"/>
    <mvc:resources mapping="/plugins/**" location="/plugins/"/>

	<!--引入自定义类型转换器-->
    <mvc:annotation-driven conversion-service="conversionService"/>
</beans>

3. Configure the dispatcher of springmvc in web.xml to start and load the corresponding configuration file

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">

  <display-name>Archetype Created Web Application</display-name>
  <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>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  	<!--我定义的请求都是@RequestMapping("/findById.do")，所以指定拦截*.do-->
    <servlet-name>dispatcherServlet</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>

  <!--字符过滤器-->
  <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>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>*.do</url-pattern>
  </filter-mapping>

4. Configure Spring, and Mybatis integration

1. Create a spring configuration file

<?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:aop="http://www.springframework.org/schema/aop"
       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/context
	http://www.springframework.org/schema/context/spring-context.xsd
	http://www.springframework.org/schema/aop
	http://www.springframework.org/schema/aop/spring-aop.xsd
	http://www.springframework.org/schema/tx
	http://www.springframework.org/schema/tx/spring-tx.xsd">
    
    <!--指定注解扫描-->
    <context:component-scan base-package="com.mediacomm">
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

	<!--指定加载的配置文件-->
    <context:property-placeholder location="classpath:db.properties" ></context:property-placeholder>
    <!--创建数据库连接池-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.user}"/>
        <property name="password" value="${jdbc.password}"/>
    </bean>

	<!--mybatis提供的整合到spring中的方式，SqlSessionFactoryBean-->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.mediacomm.dao"></property>
    </bean>

    <bean id="dataSourceTransactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>
    
    <!--使用通知，配置事务的控制方式-->
    <tx:advice id="advice" transaction-manager="dataSourceTransactionManager">
        <tx:attributes>
            <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
            <tx:method name="*" propagation="REQUIRED" read-only="false"/>
        </tx:attributes>
    </tx:advice>
    <!--配置aop来控制事务-->
    <aop:config>
        <aop:pointcut id="pt1" expression="execution(* com.mediacomm.dao.*.*(..))"/>
        <aop:advisor advice-ref="advice" pointcut-ref="pt1"/>
    </aop:config>

    
</beans>

2. Configure the loading of spring configuration files in web.xml

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationSpringConfig.xml</param-value>
  </context-param>
</web-app>

2. Deploy to tomcat

I directly publish the war package to the local tomcat service, run

3. Test one-to-many query

1. Table relationship

Relationship: An order corresponds to multiple tourist information, create an order table and a tourist table respectively, and then create an intermediate table. There are only two columns of data in the intermediate table, namely the order id and the corresponding tourist id. Query idea: query to the middle through the order
id The tourist id corresponding to the order id in the table, and then use the tourist id to query the tourist information in the tourist table

2. Order entity class

public class Order {
    
    
    private String id;
    private String orderNum;
    private Date orderTime;
    private int peopleCount;
    private String orderDesc;
    private int payType;
    private int orderStatus;
	//对应多个游客
    private List<Traveller> travellers;

3. Annotation of dao interface

The dao interface of the order

public interface OrderDao {
    
    
	@Select("select * from orders where id = #{orderId}")
    @Results(id = "orderMap",value = {
    
    
            @Result(id = true,column = "id",property = "id"),
            @Result(column = "orderNum",property = "orderNum"),
            @Result(column = "orderTime",property = "orderTime"),
            @Result(column = "peopleCount",property = "peopleCount"),
            @Result(column = "orderDesc",property = "orderDesc"),
            @Result(column = "payType",property = "payType"),
            @Result(column = "orderStatus",property = "orderStatus"),
            @Result(column = "id",property = "travellers",javaType = java.util.List.class,
                    many = @Many(select = "com.mediacomm.dao.TravellerDao.findTravellersWithOrders",fetchType = FetchType.DEFAULT))
    })
    Order findOrderById(String orderId)throws MyException;

Tourist's dao interface

public interface TravellerDao {
    
    

    @Select("SELECT tra.* from traveller tra,order_traveller ord_tra where ord_tra.orderId = #{orderId} and tra.id = ord_tra.travellerId")
    List<Traveller> findTravellersWithOrders(String orderId);
}

4. Test results

Request: http://localhost:8080/ssm_webapp_war/orders/findById.do? id=0E7231DC797C486290E8713CA3C6ECCC
shows:

Problems encountered when deployment fails

1. The resource file is not deployed to tomcat

In the pom file of the web module, introduce the resources tag to let maven package the specified resource files together

<build>
    <finalName>ssm_webapp</finalName>
    <resources>
      <resource>
        <directory>src/main/resource</directory>
        <includes>
          <include>**/**</include>
        </includes>
        <filtering>false</filtering>
      </resource>
    </resources>

2. ${pageContext.request.contextPath} cannot get the path of the current application

Solution 1: In the head declaration of jsp, add isELIgnored="false" to declare that the el expression is not ignored,
such as:

<%@ page language="java" contentType="text/html; charset=UTF-8" isELIgnored="false"
	pageEncoding="UTF-8"%>

Solution 2: Configure in the web.xml of the module, so that all jsps can take effect

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">

3. jdbc connection prompt driver ClassNotFoundException

I set the relevant information of the database through the properties configuration file, and it turned out that it was because of the double quotes added to the value in the properties file, as follows:

jdbc.driver=“com.mysql.jdbc.Driver”

I have been looking for a small problem for a long time, so I would like to record it here, if you use equal assignment, you don’t need to add quotation marks! ! Oops