SSM简单整合

SSM整合（基于IDEA的maven方式）

 

一、工程目录结构、数据库信息、POM文件

1）目录结构

 

2）数据库内容

create table people(   id int primary key auto_increment,   name char(20) not null,   age int not null,   phone char(20) not null   ); insert into people values(default,’张三’,20,’13004144155’); insert into people values(default,’李四’,20,’13004144155’); insert into people values(default,’王五’,20,’13004144155’); insert into people values(default,’赵六’,20,’13004144155’); insert into people values(default,’前吧’,20,’13004144155’);

3）pom文件

3.1 依赖导入

<dependency>    <groupId>junit</groupId>    <artifactId>junit</artifactId>    <version>4.11</version>    <scope>test</scope>  </dependency>  <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->  <dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-webmvc</artifactId>    <version>5.2.2.RELEASE</version>  </dependency>  <!--Spring java数据库访问包，在本例中主要用于提供数据源 -->  <dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-jdbc</artifactId>    <version>5.0.6.RELEASE</version>  </dependency>  <!--log4j日志文件的jar包-->  <dependency>    <groupId>org.slf4j</groupId>    <artifactId>slf4j-log4j12</artifactId>    <version>1.7.5</version>  </dependency>  <!--导入jstl标签库-->  <dependency>    <groupId>javax.servlet</groupId>    <artifactId>jstl</artifactId>    <version>1.2</version>  </dependency>  <!--mysql连接的jar包-->  <dependency>    <groupId>mysql</groupId>    <artifactId>mysql-connector-java</artifactId>    <version>8.0.15</version>  </dependency>  <!--mybatis所需的jar包-->  <dependency>    <groupId>org.mybatis</groupId>    <artifactId>mybatis</artifactId>    <version>3.4.5</version>  </dependency>  <!--mybatis与spring整合是所需的jar包-->  <dependency>    <groupId>org.mybatis</groupId>    <artifactId>mybatis-spring</artifactId>    <version>2.0.1</version>  </dependency> <!--c3p0数据源配置的jar包-->  <dependency>    <groupId>com.mchange</groupId>    <artifactId>c3p0</artifactId>    <version>0.9.5.4</version>  </dependency>

3.2配置jetty服务器

<plugin>   <groupId>org.eclipse.jetty</groupId>   <artifactId>jetty-maven-plugin</artifactId>   <version>9.4.5.v20170502</version>   <configuration>     <scanIntervalSeconds>10</scanIntervalSeconds>     <webApp>       <!-- web项目根路径 -->       <contextPath>/</contextPath>     </webApp>   </configuration> </plugin>

二、ssm整合时的配置文件

1） web.xml（将spring与springmvc配置与服务器中）

<?xml version="1.0" encoding="UTF-8"?> <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" version="3.1">   <display-name>SSM4T</display-name>   <!-- 配置Spring -->   <context-param>     <param-name>contextConfigLocation</param-name>     <param-value>classpath:spring/application-context.xml</param-value>   </context-param>   <listener>     <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>   </listener> <!-- 配置SpringMVC -->   <servlet>     <servlet-name>dispatcher</servlet-name>     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>     <init-param>       <param-name>contextConfigLocation</param-name>       <param-value>classpath:spring/dispatcher-servlet.xml</param-value>     </init-param>     <!-- 自启动servlet，我们需要让此Servlet在加载配置文件加载前出现 -->     <load-on-startup>1</load-on-startup>   </servlet>   <servlet-mapping>     <servlet-name>dispatcher</servlet-name>     <url-pattern>/</url-pattern>   </servlet-mapping> </web-app>

2）Spring整合mybatis

2.1spring的application-context.xml配置文件

 

<?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: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-4.3.xsd       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">     <!--指定使用了spring注解的包的位置-->     <context:component-scan base-package="com.abc.service"></context:component-scan>     <!--1 引入属性文件，在配置中占位使用 -->     <context:property-placeholder location="classpath:db/db.properties" />     <!--2 配置C3P0数据源 -->     <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">         <!--驱动类名 -->         <property name="driverClass" value="${mysql.driver}" />         <!-- url -->         <property name="jdbcUrl" value="${mysql.url}" />         <!-- 用户名 -->         <property name="user" value="${mysql.username}" />         <!-- 密码 -->         <property name="password" value="${mysql.password}" />         <!-- 当连接池中的连接耗尽的时候c3p0一次同时获取的连接数  -->         <property name="acquireIncrement" value="5"></property>         <!-- 初始连接池大小 -->         <property name="initialPoolSize" value="10"></property>         <!-- 连接池中连接最小个数 -->         <property name="minPoolSize" value="5"></property>         <!-- 连接池中连接最大个数 -->         <property name="maxPoolSize" value="20"></property>     </bean>     <!--3 sessionFatory的配置-->     <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">         <property name="dataSource" ref="dataSource" />         <!--别名类所在的包名-->         <property name="typeAliasesPackage" value="com.abc.pojo"/>         <!--下划线与驼峰命名之间的转换-->         <property name="configuration">             <bean class="org.apache.ibatis.session.Configuration">                 <property name="mapUnderscoreToCamelCase" value="true"/>             </bean>         </property>         <!-- sql映射文件路径，及mybatis所加载SQL语句的*Mapper文件 -->         <property name="mapperLocations"                   value="classpath*:mybatis/mapper/*Mapper.xml"></property>     </bean>     <!-- 自动扫描接口类，如果发现和某个mapper的namespace一致，那么就指导生成这个接口的实现，然后注入spring容器 -->     <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">         <!--指定会话工厂，如果当前上下文中只定义了一个则该属性可省去 -->         <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>         <!-- 指定要自动扫描接口的基础包，实现接口 -->         <property name="basePackage" value="com.abc.mapper"></property>     </bean> </beans>

2.2 spring中使用的数据库连接的db.properties文件

###########  mysql connection profile  ########### mysql.driver=com.mysql.cj.jdbc.Driver mysql.url=jdbc:mysql://localhost:3306/springboot?useUnicode=true&characterEncoding=utf8&useSSL=true&serverTimezone=UTC mysql.username=root mysql.password=115967286

 

3）SpringMVC配置文件

<?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:mvc="http://www.springframework.org/schema/mvc"        xmlns:context="http://www.springframework.org/schema/context"        xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd       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-4.3.xsd">     <!-- springmvc可以用注解的模式来进行描述操作流程 -->     <mvc:annotation-driven/>     <!--使用到SpringMVC注解类的包名-->     <context:component-scan base-package="com.abc.controller"></context:component-scan> </beans>

三、项目编写架构流程

1）People实体类

public class People {     private int id;     private String name;     private int age;     private String phone;     public int getId() {         return id;     }     public void setId(int id) {         this.id = id;     }     public String getName() {         return name;     }     public void setName(String name) {         this.name = name;     }     public int getAge() {         return age;     }     public void setAge(int age) {         this.age = age;     }     public String getPhone() {         return phone;     }     public void setPhone(String phone) {         this.phone = phone;     }     @Override     public String toString() {         return "People{" +                 "id=" + id +                 ", name='" + name + '\'' +                 ", age=" + age +                 ", phone='" + phone + '\'' +                 '}';     } }

2）peopleMapper接口与其映射的配置文件PeopleMapper.xml

public interface PeopleMapper {     List<People> SelAllPeople(); }

<?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"> <!--此处的namespace必须与PeopleMapper的路径相同，进行接口绑定，目的是为了更直观的理解--> <mapper namespace="com.abc.mapper.PeopleMapper">     <select id="SelAllPeople" resultType="People">         select *from people     </select> </mapper>

3）PeopleService与PeopleServiceImpl

public interface PeopleService {     List<People> showPeoples(); }

/*将peopleServiceImpl类交给spring管理*/ @Service public class PeopleServiceImpl implements PeopleService {     /*通过spring注入peopleMapper的管理实体*/     @Autowired     private PeopleMapper peopleMapper;     @Override     public List<People> showPeoples() {         return peopleMapper.SelAllPeople();     } }

4）PeopleController层

/*将PeopleController交给SpringMVC管理*/ @Controller public class PeopleController {     /*spring注入管理对象*/     @Autowired     private PeopleService peopleService;     @GetMapping("people")     public String demo(Model model){         model.addAttribute("peoples",peopleService.showPeoples());         return "list_people.jsp";     } }

5）list_people.jsp加载页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <html> <head>     <title>Title</title> </head> <body> <h2>people加载页面</h2> <table>     <tr>         <td>编号</td>         <td>姓名</td>         <td>年龄</td>         <td>电话</td>         <td>操作</td>     </tr>     <c:forEach var="p" items="${peoples}">         <tr>             <td>${p.id}</td>             <td>${p.name}</td>             <td>${p.age}</td>             <td>${p.phone}</td>             <td>                 <input type="button" value="修改">                 <input type="button" value="删除">             </td>         </tr>     </c:forEach> </table> </body> </html>

 

四、SSM整合总结

      在ssm整合的时候我们首先需要将spring与springmvc交给服务器管理，具体方式便是在web.xml中的配置。

      配置spring的时候我们可以通过全局的context-param配置spring文件所在的具体位置，通过listener来将spring配置于服务器中。

      配置SpringMVC的时候，我们是使用Servlet的方式去配置，所以我们需要在配置SpringMVC的时候，通过load-on-startup来使其优先加载。同理我们也可以在Servlet中的init-param属性配置SpringMVC的具体位置。

     将spring与springmvc交给完服务器管理后，我们便要具体的配置spring与SpringMVC的配置文件了。

      spring配置文件中，首先我们通过context:component-sacn告诉spring，我们所用到spring注解的包的位置，接着便是spring整合mybatis了，我们会先使用c3p0的方式来管理数据源，然后将数据源通过spring的DI方式注入于mybatis的SqlSessionFactory中，最后使用到mybatis与spring关联的自动扫描接口类，生成对应位置接口生成对应的实体且交给spring管理。到此便完成了spring对于mybatis的整合。

       SpringMVC配置中，我们首先需要通过mvc:annotation-drivern属性启动SpringMVC的注解，其次一样通过context:component-scan属性告诉SpringMVC所使用到SpringMVC注解的包的位置，注意spring是SpringMVC的父类，所以SpringMVC拥有spring的所有方法。