15、spring+mybatis+servlet框架搭建

发布于：2023-01-12 ⋅ 阅读:(327) ⋅ 点赞:(0)

1、新建一个maven项目

选择模板

image-20211027064211337

添加参数

archetypeCatalog=internal

image-20211027064522748

等待maven项目构建完成

控制台出现BUILD SUCCESS提示，并且项目结构完整（有src，main，webapp等几个包）即构建完成

image-20211027064845071

2、导入依赖

导入ssm框架项目中需要用到的jar包，替换项目中的properties标签和dependencies标签

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
    <spring.version>5.2.12.RELEASE </spring.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.4.6</version>
    </dependency>

    <!--servlet依赖-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
    </dependency>

    <!--jsp依赖-->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jsp-api</artifactId>
      <version>2.0</version>
    </dependency>

    <!--JSTL表达式依赖-->
    <dependency>
      <groupId>javax.servlet.jsp.jstl</groupId>
      <artifactId>jstl-api</artifactId>
      <version>1.2</version>
    </dependency>
    <!--standard标签库依赖-->
    <dependency>
      <groupId>taglibs</groupId>
      <artifactId>standard</artifactId>
      <version>1.1.2</version>
    </dependency>

    <!--mysql-jdbc依赖-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.48</version>
    </dependency>

    <!--json依赖-->
    <dependency>
      <groupId>net.sf.json-lib</groupId>
      <artifactId>json-lib</artifactId>
      <version>2.4</version>
      <classifier>jdk15</classifier>
    </dependency>

    <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>fastjson</artifactId>
      <version>1.2.76</version>
    </dependency>


    <!--spring依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <!--springAOP的包-->
    <dependency>
      <groupId>org.aspectj</groupId>
      <artifactId>aspectjweaver</artifactId>
      <version>1.9.4</version>
    </dependency>
    <!--ssm整合jdbc依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <!--mybatis整合依赖-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>2.0.5</version>
    </dependency>

  </dependencies>

3、配置web.xml文件

image-20211027071226381

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <context-param>
    <!-- 通过该标签配置的键值对最终是会放到ServletContext(application)中 -->
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <!-- 配置启动IOC容器的监听器:当ServletContext对象创建的时候启动IOC容器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
</web-app>

4、在项目的main目录下创建Java文件夹和resources文件夹

image-20211027071657059

如果没有图示的文件夹，则先创建一个普通的文件夹，然后再选中文件夹按鼠标右键，把文件夹标记为对应的类型即可

image-20211027071858123

5、在resources根目录下创建Spring和mybatis的配置文件

image-20211027072048431

mybatis-config.xml

配置mybatis中写sql语句的xml文件

<?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">
<configuration>
    <!--关联sql语句的xml文件-->
    <mappers>
        <mapper resource="mapper/ForeUserMapper"></mapper>
    </mappers>
</configuration>

applicationContext

配置扫描器，以及和mybatis的整合

<?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"
       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">
    <!--
        DataSource:使用Spring的数据源替换Mybatis的配置c3pθ dbcp druid
     我们这里使用Spring提供的JDBC:org.springframework.jdbc.datasource
    -->
    <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/train12306-2?useSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>

    <!--sql会话工厂对象-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="datasource"/>
        <!--连通mybatis、-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!-- 将mybatis实现的接口注入到spring容器中 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
        <property name="basePackage" value="com.cykj.mapper"></property>
    </bean>


    <!--统一管理bean
声明组件扫描器，组件就是Java对象
base-package:要扫描的包
component-scan工作方式：Spring会扫描遍历base-package指定的包
    把包中的所有类，找到类中的注解，按照注解的功能来创建对象，或给属性赋值
-->
    <context:component-scan base-package="com.cykj"/>
</beans>

6、在java目录创建包com.cykj并在cykj包下面创建四个包

image-20211027072836310

7、编写测试的所有代码，测试spring与mybatis是否可用

8、Servlet中本来不能使用@Autowired注入bean，解决办法修改每个servlet中的init方法

package com.cykj.web;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.SpringBeanAutowiringSupport;
import org.springframework.web.context.support.WebApplicationContextUtils;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

public class BaseServlet extends HttpServlet {
    private ApplicationContext app;

    @Override
    public void init(ServletConfig config) throws ServletException {
        super.init(config);
        //Servlet中本来不能使用@Autowired注入bean，解决办法是在Servlet的init（ServletConfig）方法中调用
        SpringBeanAutowiringSupport.processInjectionBasedOnServletContext(this, config.getServletContext());
        app = WebApplicationContextUtils.getWebApplicationContext(getServletContext());
    }
    public Object getObject(Class c) {
        return app.getBean(c);
    }
}

anAutowiringSupport.processInjectionBasedOnServletContext(this, config.getServletContext());
app = WebApplicationContextUtils.getWebApplicationContext(getServletContext());
}
public Object getObject(Class c) {
return app.getBean©;
}
}
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