15、spring+mybatis+servlet框架搭建

1、新建一个maven项目

选择模板

添加参数

archetypeCatalog=internal

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

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

  <dependencies>
    <dependency>
      <groupId>junitgroupId>
      <artifactId>junitartifactId>
      <version>4.11version>
      <scope>testscope>
    dependency>

    
    <dependency>
      <groupId>org.mybatisgroupId>
      <artifactId>mybatisartifactId>
      <version>3.4.6version>
    dependency>

    
    <dependency>
      <groupId>javax.servletgroupId>
      <artifactId>javax.servlet-apiartifactId>
      <version>4.0.1version>
    dependency>

    
    <dependency>
      <groupId>javax.servletgroupId>
      <artifactId>jsp-apiartifactId>
      <version>2.0version>
    dependency>

    
    <dependency>
      <groupId>javax.servlet.jsp.jstlgroupId>
      <artifactId>jstl-apiartifactId>
      <version>1.2version>
    dependency>
    
    <dependency>
      <groupId>taglibsgroupId>
      <artifactId>standardartifactId>
      <version>1.1.2version>
    dependency>

    
    <dependency>
      <groupId>mysqlgroupId>
      <artifactId>mysql-connector-javaartifactId>
      <version>5.1.48version>
    dependency>

    
    <dependency>
      <groupId>net.sf.json-libgroupId>
      <artifactId>json-libartifactId>
      <version>2.4version>
      <classifier>jdk15classifier>
    dependency>

    
    <dependency>
      <groupId>com.alibabagroupId>
      <artifactId>fastjsonartifactId>
      <version>1.2.76version>
    dependency>


    
    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-webmvcartifactId>
      <version>${spring.version}version>
    dependency>
    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-coreartifactId>
      <version>${spring.version}version>
    dependency>
    
    <dependency>
      <groupId>org.aspectjgroupId>
      <artifactId>aspectjweaverartifactId>
      <version>1.9.4version>
    dependency>
    
    <dependency>
      <groupId>org.springframeworkgroupId>
      <artifactId>spring-jdbcartifactId>
      <version>${spring.version}version>
    dependency>

    
    <dependency>
      <groupId>org.mybatisgroupId>
      <artifactId>mybatis-springartifactId>
      <version>2.0.5version>
    dependency>

  dependencies>
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3、配置web.xml文件

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 Applicationdisplay-name>
  <context-param>
    
    <param-name>contextConfigLocationparam-name>
    <param-value>classpath:applicationContext.xmlparam-value>
  context-param>
  
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
  listener>
web-app>
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4、在项目的main目录下创建Java文件夹和resources文件夹

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

5、在resources根目录下创建Spring和mybatis的配置文件

mybatis-config.xml

配置mybatis中写sql语句的xml文件

DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    
    <mappers>
        <mapper resource="mapper/ForeUserMapper">mapper>
    mappers>
configuration>
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applicationContext

配置扫描器，以及和mybatis的整合

<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">
    
    <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&useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    bean>

    
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="datasource"/>
        
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    bean>

    
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory">property>
        <property name="basePackage" value="com.cykj.mapper">property>
    bean>


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

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6、在java目录创建包com.cykj并在cykj包下面创建四个包

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

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