SpringMVC入门二:SSM整合(spring+springmvc+mybatis)

一、编程步骤

1、引入依赖

spring、springmvc、mybatis、mybatis-spring、mysql、druid、log4j、servlet-api、jstl、fastjson

2、SM整合=Spring+mybatis

1)建表

2)实体类

3)DAO接口

public interface UserDao {
    List<User>findAll();
    void save(User user);
}

4)Mapper配置文件(位置:resources/mapper/UserDaoMapper.xml)

<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.icucoder.dao.UserDao">
    <select id="findAll" resultType="User">
        select id, name, age, email
        from user;
    </select>
    <insert id="save" parameterType="User">
        insert into user
        values (#{id}, #{name}, #{age}, #{email});
    </insert>

</mapper>

5)Service接口

public interface UserService {
    List<User> findAll();

    void save(User user);
}

6)Service实现类 @Service @Transactional 注入DAO对象

@Service("userService")
@Transactional
public class UserServiceImpl implements UserService {
    @Autowired
    UserDao userDao;

    public List<User> findAll() {
        return userDao.findAll();
    }

    public void save(User user) {
        userDao.save(user);
        //int i = 1 / 0;
        System.out.println("save success");
    }
}

7)引入spring.xml文件,编写spring整合mybatis配置

(1)开启注解扫描<context:component-scan base-package="com.icucoder"/>

<context:component-scan base-package="com.icucoder"/>

(2)创建数据源对象DruidDataSource ,注入driverClassName url username passwrod

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://127.0.0.1:3306/springboot?characterEncoding=UTF-8&serverTimezone=UTC"/>
        <property name="username" value="root"/>
        <property name="password" value="xroot"/>
    </bean>

(3)创建SqlSessionFactoryBean对象SqlSessionFactory ,注入dataSource,注入mapper配置文件位置mapperLocations,注入typeAliasesPackage

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
        <property name="typeAliasesPackage" value="com.icucoder.entity"/>
    </bean>

(4)创建DAO,使用MapperScannerConfigurer配置某路径下DAO自动扫描,注入sqlSessionFactoryBeanName配置sqlSessionFactory和注入basePackage配置DAO接口所在包

<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--扫描DAO接口所在包-->
        <property name="basePackage" value="com.icucoder.dao"/>
    </bean>

(5)创建事务管理器DataSourceTransactionManager,注入DataSource

<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

(6)开启注解式事务驱动<tx:annotation-driven transaction-manager="事务管理器在工厂中的唯一标识"/>

<tx:annotation-driven transaction-manager="transactionManager"/>

 8)测试Service方法调用

ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
UserService userService = (UserService) context.getBean("userService");
User user=new User(7,"test",12,"admin@qq.com");
userService.save(user);
System.out.println(userService.findAll());

3、SS整合=Spring+SpringMVC

1)配置web.xml

 (1)启动工厂监听器

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

 (2)配置工厂配置文件spring.xml

<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring.xml</param-value>
</context-param>

(3)配置springmvc核心的Servlet:DispatcherServlet,url-pattern /,并在init-param中配置contextConfigLocation为classpath:springmvc.xml

<servlet>
    <servlet-name>springmvc</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>
</servlet>

<servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
</servlet-mapping>

(4)配置springmvc接收post请求中文乱码 CharacterEncodingFilter usl-pattern /* init-param encoding UTF-8

<filter>
    <filter-name>charset</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>
</filter>
<filter-mapping>
    <filter-name>charset</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

2)引入springmvc.xml

(1)开启注解扫描controller

<context:component-scan base-package="com.icucoder.controller"/>

(2)配置处理器映射器和处理器适配器

<mvc:annotation-driven/>

(3)配置视图解析器

<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/"/>
    <property name="suffix" value=".jsp"/>
</bean>

3)开发Controller并使用@Controller@RequestMapping,注入Service

 (1)controller

@Controller
@RequestMapping("/user")
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping("/all")
    public String getUser(HttpServletRequest request) {
        List<User> users = userService.findAll();
        request.setAttribute("users", users);
        return "index";
    }
}

 (2)jsp

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<h3>all users info</h3>
<c:forEach items="${requestScope.users}" var="user">
    ${user.id} & ${user.name}
</c:forEach>
</body>
</html>

4)服务器附属并访问测试

 http://localhost:8080/spring_sprinmvc_mybatis_war/user/all

二、说明

1、现有SSM开发存在的问题

1)大量maven冗余配置

2)每次构建项目都要书写大量相同配置极大浪费了项目开发时间

3)每次整合第三方技术都要编写相关配置文件

4)项目测试每次都需要部署到tomcat

 
 
posted @ 2021-03-26 08:39  权杖攻城狮  阅读(86)  评论(0编辑  收藏  举报