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SSM整合 基础篇

SSM整合 基础篇

作者: 楊柯林 | 来源:发表于2019-07-11 10:29 被阅读0次

SSM整合

需求:通过SSM整合做出对前端基本查询的jsp响应

1 数据库数据

数据库数据如下

Field Type
id int(10)
name varchar(20)
price float(10,0)
pic varchar(40)
createtime datetime
detail varchar(200)

创建父工程ssm_parent 的maven工程 删掉src包
gruopId=com.tencent
导入父工程的pom.xml
文件目录

2 后台dao层配置

2.1 新建domain层

根据数据库构造实体类

//Dao层  com.tencent.domain
public class Item {
    private Integer id;
    private String name;
    private Double price;
    private String pic;
    private Date createtime;
    private String detail;
    //省略set和get方法
    
2.1 新建dao层

要求查询所有items
dao层实现 (dao module)
Module dao下
创建ItemMapper接口

//Dao层 com.tencent.itemMapper/
public interface ItemMapper {
    @Select("select * from items")
    List<Item> findAllItem();

}
<!--Dao层 pom.xml-->
<?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">
    <parent>
        <artifactId>maven_highLevel_parent</artifactId>
        <groupId>com.tencent</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <!--添加packaging-->
    <packaging>jar</packaging>

    <artifactId>dao</artifactId>


</project>

写入配置文件

<!--Web层 applicationContext.xml-->
<!--引入约束头-->
<?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.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
">
<!--写入dao层配置-->
<!--配置数据源-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="com.mysql.jdbc.Driver"/>
        <property name="jdbcUrl" value="jdbc:mysql:///test"/>
        <property name="user" value="root"/>
        <property name="password" value="123456"/>
    </bean>


     <!--生产sqlSession,做一个sqlSessionFactory工厂-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--sqlSessionFactory扫描mapper层在service层进行mapper注入-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.tencent.mapper"/>
    </bean>

    <!--dao层结束-->

针对dao层的测试代码


3 后台service层配置

3.1 新建service层

Module service下
引入dao层依赖

 <dependencies>
        <dependency>
            <groupId>com.tencent</groupId>
            <artifactId>dao</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

创建ItemService接口

//service层 com.tencent.service/
public interface ItemService {
    List<Item> findAllItem();
}

创建ItmServiceImpl实现类

//service层 com.tencent.service.impl/
@Service
@Transactional
public class ItemServiceImpl implements ItemService {
    @Autowired
    private ItemMapper itemMapper;

    public List<Item> findAllItem() {
        List<Item> itemList = itemMapper.findAllItem();
        return itemList;
    }
}
3.2 service写入配置文件

service写入配置文件

<!--service层开始-->
    <context:component-scan base-package="com.tencent.service"/>

    <!--声明事务-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 注册驱动 -->
    <!-- 声明式事务 -->
    <!-- 在service上加上@transactional事务注解配置文件里 -->
    <tx:annotation-driven/>



    <!--service层结束-->

针对service层的测试代码


4 web层实现

4.1 web层controller实现

引入service层依赖

<dependencies>
        <dependency>
            <groupId>com.tencent</groupId>
            <artifactId>service</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

Controller类实现

@Controller
@RequestMapping("/item")
public class ItemController {
    @Autowired
    private ItemService itemService;

    @RequestMapping("/findAllItems")
    public String findAllItems(Model model){
        model.addAttribute("items",itemService.findAllItem());
        return "itemDetail";
    }
}
<!--Web层 springMvc.xml-->
<!--引入约束头-->
<?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.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
">

<!--controller扫描-->
    <context:component-scan base-package="com.tencent.controller"/>
4.2 web层web三大组件实现
<!--Web层 webapp/web-inf/web.xml-->
<!-- 引入约束头 -->
<?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">

<!-- 中文乱码过滤器 -->
<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>
        <!-- 强力乱码过滤,不管以前编码格式是谁,现在起,都得是utf-8 -->
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--前端控制器-->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 引入springMvc文件 -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <!-- 服务器启动就创建 -->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>


    <!--监听器-->
    <!-- 将applicationContext设在servletContext域中 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>


4.3 springMvc组件补全
<!--视图解析器-->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/pages/"/>
        <property name="suffix" value=".jsp" />
    </bean>

<!-- mvc注解驱动,看到controller -->
    <mvc:annotation-driven />
<!-- 前端控制器静态资源放行 -->
    <mvc:default-servlet-handler/>
<!--Web层 webapp/pages/itemDetail.jsp-->
<!-- 引入jstl约束 -->
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>


<form>
        <table width="100%" border=1>
            <c:forEach items="${items}" var="item">
            <tr>
                <td>商品名称</td>
                <td> ${item.name } </td>
            </tr>
            <tr>
                <td>商品价格</td>
                <td> ${item.price } </td>
            </tr>
            <tr>
                <td>生成日期</td>
                <td> <fmt:formatDate value="${item.createtime}" pattern="yyyy-MM-dd HH:mm:ss"/> </td>
            </tr>
            <tr>
                <td>商品简介</td>
                <td>${item.detail} </td>
            </tr>
            </c:forEach>
        </table>
<!-- index.jsp -->
<jsp:forward page="item/findAllItems"></jsp:forward>

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