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基于Maven项目 Spring MVC 整合Mybatis

欢马劈雪

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一、创建Maven工程项目

1.新建一个Maven工程当作父工程！pom依赖！

<!--依赖-->
<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.1.9.RELEASE</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet.jsp/javax.servlet.jsp-api -->
    <dependency>
        <groupId>javax.servlet.jsp</groupId>
        <artifactId>javax.servlet.jsp-api</artifactId>
        <version>2.3.1</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>

</dependencies>

2. 建立一个Moudle：springmvc-01-servlet，添加web app的支持。

3. 导入servlet和jsp依赖：已经包含在父依赖

4. 编写一个Servlet类，用来处理用户的请求

public class HelloServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取前端参数
        String method = req.getParameter("method");
        if(method.equals("add")){
            req.getSession().setAttribute("msg","执行了add方法");
        }
        if(method.equals("delete")){
            req.getSession().setAttribute("msg","执行了delete方法");
        }
        //2.调用业务层

        //3.页面跳转
        req.getRequestDispatcher("/WEB-INF/jsp/test.jsp").forward(req,resp);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        doGet(req,resp);
    }
}

5. 编写Hello.jsp，在WEB-INF目录下新建一个jsp的文件夹，新建hello.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
#{msg}
</body>
</html>

6. 在web.xml中注册servlet

<servlet>
    <servlet-name>hello</servlet-name>
    <servlet-class>com.kuang.servlet.HelloServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>hello</servlet-name>
    <url-pattern>/hello</url-pattern>
</servlet-mapping>

7. 配置Tomcat，并启动测试！

localhost:8080?hello/method=add
localhost:8080?hello/method=delete

注意点：

每个模块需要配置到tomcat-deployment，必须部署到服务器上！！！

MVC框架要做哪些事情？

将url映射到java类或类中的方法；
封装用户提交的数据；
处理请求---调用相关业务处理--封装响应数据；
将响应数据进行渲染 .jsp/html等显示层数据。

二、配置spring MVC

新建一个module，添加web的支持
确定导入了SpringMVC的依赖
配置web.xml，注册DispatcherServlet

<?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">

    <!--配置 DispatcherServlet：SpringMVC核心；请求分发器，前端控制器-->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!--DispatcherServlet要绑定SpringMVC的配置文件-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
        <!--启动级别:1-->
        <load-on-startup>1</load-on-startup>

    </servlet>
    <!--
    在SpringMVC中 /和/*
    /  ： 只匹配所有的请求，不会匹配jsp
    /* ： 匹配所有的请求，包括jsp页面
    -->
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>


</web-app>

4. 编写SpringMVC的配置文件！名称：springmvc-servlet.xml

5. 添加处理映射器

<!--处理器映射器-->
<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>

6. 添加处理器适配器

<!--处理器适配器-->
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

7. 添加视图解析器

<!--视图解析器: 模版引擎 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" id="internalResourceViewResolver">
    <property name="prefix" value="/WEB-INF/jsp/"/>
    <property name="suffix" value=".jsp"/>
</bean>

8. 编写我们要操作业务Controller，要么实现Controller接口，要么增加注解；需要返回一个ModelAndView，装数据，封视图；

public class HelloController implements Controller {
    public ModelAndView handleRequest(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse) throws Exception {
        ModelAndView mv = new ModelAndView();

        //1.业务代码
        String result="HelloSpringMVC";

        mv.addObject("msg",result);

        //2.视图跳转
        mv.setViewName("test");

        return mv;
    }
}

9. 将自己的类交给SpringIOC容器，注册bean

<bean id="/hello" class="com.kuang.Controller.HelloController"/> 写要跳转的jsp页面，显示ModelandView存放的数据，以及页面；
 xml <%--   Created by IntelliJ IDEA.   User: Administrator   Date: 2020/8/1   Time: 23:54   To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head>     <title>Title</title> </head> <body> ${msg} </body> </html>

10. 写要跳转的jsp页面，显示ModelandView存放的数据，以及页面；

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2020/8/1
  Time: 23:54
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
${msg}
</body>
</html>

11. 配置Tomcat启动测试！

可能遇到的问题：访问出现404，排查步骤：

查看控制台输出，看是不是缺少了jar包；
如果jar包存在，显示无法输出，就在idea的项目发布中，添加lib依赖！
重启Tomcat即可解决！

三、整合 Mybatis

导入相关jar包：junit、mybatis、mysql数据库、spring相关的、aop织入、mybatis-spring【新知识点】

<dependencies>
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>5.1.47</version>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
        <version>3.5.2</version>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.1.9.RELEASE</version>
    </dependency>
    <!--Spring操作数据库的话，还需要spring-jdbc依赖-->
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
        <version>5.1.9.RELEASE</version>
    </dependency>
    <dependency>
        <groupId>org.aspectj</groupId>
        <artifactId>aspectjweaver</artifactId>
        <version>1.8.13</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>2.0.2</version>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.16.10</version>
    <scope>provided</scope>
</dependency>
</dependencies>

2. 编写配置文件

3. 测试

3.1 回忆Mybatis

编写实体类

@Data
public class User {
    private int id;
    private String name;
    private String pwd;
}

编写核心配置类

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<!--核心配置文件-->
<configuration>
    <properties resource="db.properties"/>

    <!--可以给实体类起别名-->
    <typeAliases>
        <!--<typeAlias type="com.kuang.pojo.User" alias="User"/>-->
        <package name="com.kuang.pojo" />
    </typeAliases>

    <environments default="development">
        <environment id="development">
            <transactionManager type="JDBC"/>
            <dataSource type="POOLED">
                <property name="driver" value="${driver}"/>
                <property name="url" value="${url}"/>
                <property name="username" value="${username}"/>
                <property name="password" value="${password}"/>
            </dataSource>
        </environment>
    </environments>

    <mappers>
        <mapper class="com.kuang.mapper.UserMapper"/>
    </mappers>


</configuration>

db.properties

driver=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=UTF-8
username=huba
password=123456

编写接口

public interface UserMapper {
    public List<User> selectUser();
}

编写mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kuang.mapper.UserMapper">
    <select id="selectUser" resultType="user">
        select * from mybatis.user;
    </select>

</mapper>

测试

@Test
public void test1() throws IOException {
    String resource="mybatis-config.xml";
    InputStream inputStream = Resources.getResourceAsStream(resource);
    SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
    SqlSession sqlSession = sqlSessionFactory.openSession();

    UserMapper mapper = sqlSession.getMapper(UserMapper.class);
    List<User> userList = mapper.selectUser();

    for (User user : userList) {
        System.out.println(user);
    }
}

解决资源过滤问题：（pom.xml）

<build>
    <resources>
        <resource>
            <directory>src/main/java</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
        <resource>
            <directory>src/main/resources</directory>
            <includes>
                <include>**/*.properties</include>
                <include>**/*.xml</include>
            </includes>
            <filtering>false</filtering>
        </resource>
    </resources>
</build>

3.2 Mybatis-Spring

整合方式一：SqlSessionTemplate

编写数据源配置

<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"/>
    <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>
    <property name="username" value="huba"/>
    <property name="password" value="123456"/>
</bean>

sqlSessionFactory

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编辑于 2020-09-01 12:28:532020-09-01 12:28:53

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