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【项目实践】IDEA整合SSM框架学习

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IDEA整合SSM框架学习------项目实践及遇到的问题

一、SSM框架整合,项目实践

1.1 依赖导入,pom.xml

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <!--日志我们使用logback-->
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>1.2.3</version>
    </dependency>

    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.10</version>
      <scope>provided</scope>
    </dependency>
    <!-- ***************数据库相关配置****************** -->
    <!-- mysql驱动依赖包,连接mysql必备-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.23</version>
    </dependency>

    <!-- 数据源依赖包,能大幅提升性和便利性。这里我们用阿里的德鲁伊数据源-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.12</version>
    </dependency>

    <!-- Mybatis必备依赖包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>

    <!-- ***************web相关配置****************** -->
    <!--配置JavaEE依赖包,包含了Servlet、Validation等功能-->
    <dependency>
      <groupId>javax</groupId>
      <artifactId>javaee-api</artifactId>
      <version>8.0</version>
      <scope>provided</scope>
    </dependency>

    <!-- JSTL依赖包,如果用将jstl标签用在jsp中就要此依赖包。非必需的 -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>

    <!-- jackson依赖包,用来将java对象转换JSON格式,SpringMVC要用的 -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.10.2</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.12.1</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.12.0</version>
    </dependency>

    <!-- ***************Spring相关配置****************** -->
    <!--配置Spring JDBC容器所需的jar包-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>

    <!--配置Spring IOC容器所需的jar包-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.2.6.RELEASE</version>
    </dependency>

    <!--Spring mvc-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.6.RELEASE</version>
    </dependency>

    <!-- AspectJ所需的jar包-->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.9.4</version>
    </dependency>

    <!--Spring测试依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.2.6.RELEASE</version>
      <scope>test</scope>
    </dependency>

    <!--配置Spring整合mybatis的jar包-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.2</version>
    </dependency>

    <!--jackson引入依赖-->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.4</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-annotations</artifactId>
      <version>2.9.4</version>
    </dependency>
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-core</artifactId>
      <version>2.9.4</version>
    </dependency>
  </dependencies>

1.2 spring与Mybatis整合

数据库配置

CREATE TABLE `user` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT COMMENT ‘主键id‘,
  `name` varchar(255) COLLATE utf8mb4_bin NOT NULL COMMENT ‘账户名‘,
  `password` varchar(255) COLLATE utf8mb4_bin NOT NULL COMMENT ‘账户密码‘,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin;

INSERT INTO `user` VALUES (1, ‘admin‘, ‘123456‘);
INSERT INTO `user` VALUES (2, ‘rudecrab‘, ‘654321‘);

然后,我们需要再entity包下创建一个与数据库表对应的类User。

@Data
@NoArgsConstructor
public class User implements Serializable {
    private Long id;

    private String  name;

    private String password;
}

数据库类创建好后,我们需要来配置数据库连接相关的属性,来与我们的mybatis进行整合。(账号、密码根据个人情况进行更改,mysql 8.0以后的驱动尽量用com.mysql.cj.jdbc.Driver)

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?userSSl=false&serverTimezone=GMT&characterEncoding=utf8
jdbc.username=root
jdbc.password=root

1.3 Mybatis全局配置

下面我们对Spring和Mybatis进行整合。我们需要在resources文件夹下新建mybatis-config.xml文件,来对Mybatis进行全局配置。

<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <!--全局配置-->
    <settings>
        <setting name="logImpl" value="SLF4J"/>

        <!--启用主键生成策略-->
        <setting name="useGeneratedKeys" value="true"/>

        <!--配置启用下划线转驼峰的映射-->
        <setting name="mapUnderscoreToCamelCase" value="true"/>

        <!--启用二级缓存-->
        <setting name="cacheEnabled" value="true"/>
    </settings>
</configuration>

1.4 Spring-Mybatis整合配置

接下来再来新建spring-mybatis.xml文件,这个文件用作整合的。有不懂得地方,可以看注释。

<?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 https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--属性文件的读取,这里读取刚才我们的数据库连接相关配置-->
    <context:property-placeholder location="classpath:database.properties" file-encoding="UTF-8"/>

    <!--配置自动扫描,如果不配置这个那么就无法使用@Autowired加载bean-->
    <context:component-scan base-package="com.lx.ssm" use-default-filters="true">
        <!--这里要排除掉Controller的注解,Controller专门交给MVC去扫描,这样会就不会冲突-->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!--配置数据源-->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <!--配置JDBC基础属性,即数据库连接相关配置-->
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <!--配置连接池的设置,这个是要根据真实项目情况来配置的,随着项目的发展会不断修改-->
        <property name="initialSize" value="10"/>
        <property name="maxActive" value="100"/>
    </bean>

    <!--
    重点来了,这里配置是MyBatis的SqlSessionFactory,就是这一块配置将Spring和Mybatis整合到了一起
    如果不配置这里,你的mapper接口只能通过SqlSession来获取,十分麻烦。这里配置好后就可以通过Spring IoC来获取mapper接口了
    -->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactory">
        <!--指定数据源-->
        <property name="dataSource" ref="dataSource"/>
        <!--加载mybatis全局设置,classpath即我们的资源路径resources-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
        <!--配置Mybatis的映射xml文件路径-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

    <!--指定Mybatis的mapper接口扫描包-->
    <!--注意!!!如果用的是tk.mybatis自动生成的mapper接口,一定要将org.mybatis.改成tk.mybatis-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--指定刚才我们配置好的sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--指定mapper接口扫描包-->
        <property name="basePackage" value="com.lx.ssm.mapper"/>
    </bean>

    <!--配置事务管理器,如果不配置这个,不启动事务扫描的话,那么发生了异常也不会触发回滚-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--还得指定数据源-->
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!--启动事务的扫描-->
    <tx:annotation-driven/>

</beans>

1.5 JUnit 测试

以防万一,我们先将Spring与Mybatis的整合,进行测试。
技术图片

UserMapper接口专门用来声明各种数据库操作的方法,@Repository注解将其定义为Spring所管理的bean:

@Repository
public interface UserMapper {
    List<User> selectAll();
}

UserMapper.xml映射文件用来写方法对应要执行的SQL语句:

<?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.lx.ssm.mapper.UserMapper">
    <cache/>
    <!--从数据库查出所有的User对象-->
    <select id="selectAll" resultType="com.lx.ssm.entity.User">
        select * from user
    </select>
</mapper>

UserService接口用来声明关于User的业务方法:

public interface UserService {
	// 返回User对象集合
    List<User> getAll();
}

UserServiceImpl实体类用来实现关于User的业务逻辑,@Service注解和@Repository注解用处一样,将其定义为bean。@Transactional注解为声明式事务。

@Transactional(rollbackFor = Exception.class)
public class UserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Override
    public List<User> getAll() {
        return userMapper.selectAll();
    }
}

测试类:

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations={"classpath:spring-mybatis.xml"})
public class UserServiceTest {

    @Autowired
    private UserService userService;

    @Test
    public void getAll(){
        System.out.println(userService.getAll());
    }

}

测试成功结果:
技术图片

1.6 SpringMVC

Spring与Mybatis的整合测试成功,我们下面来配置SpringMVC。在resources文件夹下创建spring-mvc.xml文件进行配置。

<?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">

    <!--配置视图解析器,这样控制器里就直接返回文件名就好了-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--前缀-->
<!--        <property name="prefix" value="/WEB-INF/views/"/>-->
        <property name="prefix" value="/WEB-INF/view/"/>
        <!--后缀-->
        <property name="suffix" value=".jsp"/>
    </bean>

    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"/>
            </list>
        </property>
    </bean>

    <!--配置静态资源过滤,不然静态资源比如css是访问不到的-->
    <mvc:default-servlet-handler/>

    <!--配置扫描的包-->
    <context:component-scan base-package="com.lx.ssm.controller" use-default-filters="false">
        <!--只扫描controller,实际开发中最好用这种方式来写,这边MVC就只扫描controller,就不会IOC那边冲突,否则事务会被覆盖,IOC那边就要排除这个controller-->
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!--启用MVC的注解-->
    <mvc:annotation-driven/>
</beans>

web.xml配置

<?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">

  <!--1.配置Spring IOC容器的创建,如果不配置这个,Mybatis就在web应用里无法使用-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <!--spring和mybatis整合配置文件路径-->
    <param-value>classpath:spring-mybatis.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <!--2.配置SpringMVC的前端控制器-->
  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <!--SpringMVC整合配置文件路径-->
      <param-value>classpath:spring-mvc.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>

  <!--3.配置字符编码过滤器-->
  <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>
    <init-param>
      <param-name>forceEncoding</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

最终测试
在WEB-INF文件夹下,创建view文件夹,在此目录下创建index.jsp文件:

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>首页-original</title>
</head>
<body>
<%--循环提取userList中的元素--%>
<c:forEach var="user" items="${userList}">
    <ul>
        <li>${user}</li>
    </ul>
</c:forEach>
</body>
</html>

接下来在controller包下新建一个控制器类类定义访问接口:

@Controller
@RequestMapping(value = "user")
public class UserController {
    @Autowired
    private UserService userService;

    @GetMapping("/getList")
    public String getList(Model model){
        /*将数据存到model对象里,使jsp可以访问数据*/
        model.addAttribute("userList",userService.getAll());
        /*返回jsp文件名*/
        return "index";
    }

    @GetMapping("/getJson")
    @ResponseBody
    public List<User> getList(){
        return userService.getAll();
    }
}

测试成功:
技术图片
技术图片

【项目实践】IDEA整合SSM框架学习

标签:under   ada   eth   space   账户   use   spring   int   二级缓存   

原文地址:https://www.cnblogs.com/eason-xun/p/14545202.html

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