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SSM入门---写一个简单的SSM案例

杏花疏影1 2022-04-07 阅读 69
mavenmybatisjavaspringssm

SSM入门---写一个简单的SSM案例

前言

SSM：springMVC、spring、mybatis
将三个框架进行整合

一、表、数据

新建一个数据库ssm，新建一个表

create table person(
	id int primary key auto_increment,
	name varchar(20),
	age int
);

填点数据

insert into person values(null,'张无忌',30),(null,'赵敏',28),(null,'小昭',23);

二、新建一个Maven的web项目，导入依赖

不会建maven的web项目，可以看我以往的文章：Maven入门—如何在idea中配置Maven

<?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>org.example</groupId>
    <artifactId>untitled</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
        <spring-version>5.2.15.RELEASE</spring-version>
    </properties>


    <packaging>war</packaging>

    <dependencies>
        <!--   springmvc     -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${spring-version}</version>
        </dependency>
        <!--   spring     -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${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>
        <!--   mybatis     -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>
        <!--   spring与mybatis的整合包     -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.6</version>
        </dependency>
        <!--   数据驱动     -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>
        <!--   数据源     -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.8</version>
        </dependency>

        <!--    log4j    -->
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.12</version>
        </dependency>

        <!-- jackson -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.9.9</version>
        </dependency>



    </dependencies>

<!--服务器插件-->
    <build>
    <plugins>
        <plugin>
            <groupId>org.apache.tomcat.maven</groupId>
            <artifactId>tomcat7-maven-plugin</artifactId>
            <version>2.2</version>
            <configuration>
                <!--指定编码格式-->
                <uriEncoding>utf-8</uriEncoding>
                <!--指定项目启动后的访问路径-->
                <path>/</path>
                <!--指定访问端口号-->
                <port>8080</port>
            </configuration>
        </plugin>
    </plugins>
    </build>
</project>

三、在resources下新建一个spring配置文件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:mybatis="http://mybatis.org/schema/mybatis-spring"
       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/aop
        http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx
        https://www.springframework.org/schema/tx/spring-tx.xsd
        http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context.xsd
        http://mybatis.org/schema/mybatis-spring
        http://mybatis.org/schema/mybatis-spring.xsd">


    <!--  扫包  service层    controller由springmvc扫  -->
    <context:component-scan base-package="com.ujiuye.service"/>


    <!--加载数据库配置文件-->
    <context:property-placeholder location="classpath:db.properties"/>

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


    <!-- mybatis的核心对象 sqlSessionFactory  -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="albabaDataSource"/>
        <property name="typeAliasesPackage" value="com.ujiuye.entity"/>
    </bean>

    <!-- 扫描mybatis接口 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.ujiuye.mapper"></property>

    </bean>



</beans>

四、在resources下新建一个SpringMVC配置文件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: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
      http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--  扫包  controller  -->
    <context:component-scan base-package="com.ujiuye.controller"/>

    <!--  支持注解开发  -->
    <mvc:annotation-driven>
        <mvc:message-converters register-defaults="true">
            <bean class="org.springframework.http.converter.StringHttpMessageConverter" >
                <property name = "supportedMediaTypes">
                    <list>
                        <value>application/json;charset=utf-8</value>
                        <value>text/html;charset=utf-8</value>
                        <!-- application 可以在任意 form 表单里面 enctype 属性默认找到 -->
                        <value>application/x-www-form-urlencoded</value>
                    </list>
                </property>
            </bean>
        </mvc:message-converters>
    </mvc:annotation-driven>

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

    <!--  视图解析器  -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/" />
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

五、修改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_3_1.xsd"
         version="3.1">

    <!--  监听器  监听spring容器中对象的创建与销毁     -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!--  加载spring配置文件  -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>

    
    <!--  前端控制器  -->
    <servlet>
        <servlet-name>app</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--    加载springmvc配置文件    -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>app</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>


</web-app>

六、逆向代码生成器

不会使用逆向代码生成的请看我以往文章：Mybatis—几分钟就能学会的Mybatis逆向工程（代码生成器）
根据数据库表将生成的实体类、mapper、还有mapper配置文件放到对应目录下，如图：
在这里插入图片描述

七 、在resources下新建一个db.properties，用来记录数据库名以及密码

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql:/localhost:8080/ssm
jdbc.username=root
jdbc.password=123456

八、业务层

在service包下，编写

public interface PersonService {

    public List<Person> find();
}

@Service("personService")
public class PersonServiceImpl implements PersonService{

    @Resource
    private PersonMapper personMapper;

    @Override
    public List<Person> find() {
        return personMapper.findAll();
    }
}

九、持久层

@Select("select * from person")
    public List<Person> findAll();

十、表现层

@Controller
@RequestMapping("person")
public class PersonController {

    @Resource
    private PersonService personService;

    @RequestMapping("findAll")
    @ResponseBody
    public List<Person> findAll(){
        List<Person> personList = personService.find();
        return personList;
    }
}

十一、测试

启动服务器插件
在这里插入图片描述
运行结果
在这里插入图片描述

举报

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