SSM整合(spring-springmvc-mybatis)之HelloWorld

Posted 2022-03-24 啄木鸟伍迪

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一、目录结构

helloworld(SSM)创建步骤：

步骤一：创建一个类型为Dynamic Web Project 名称为ssm的项目

步骤二：加入jar包：

spring核心jar包：

commons-logging-1.2.jar
spring-beans-5.3.10.jar
spring-context-5.3.10.jar
spring-core-5.3.10.jar
spring-expression-5.3.10.jar

spring aop:

spring-aop-5.3.10.jar
spring-aspects-5.3.10.jar

springmvc jar包：

spring-web-5.3.10.jar
spring-webmvc-5.3.10.jar

spring 数据库交互jar包：

spring-jdbc-5.3.10.jar
spring-tx-5.3.10.jar

mybatis jar包：

mybatis-3.5.9.jar
mysql-connector-java-8.0.27 (1).jar
log4j-1.2.17.jar

mybatis-spring 适配器包：

mybatis-spring-1.3.2.jar

c3po:

c3p0-0.9.5.5.jar
c3p0-oracle-thin-extras-0.9.5.5.jar
mchange-commons-java-0.2.19.jar

MyBatis-Spring下载地址：

https://github.com/mybatis/spring 在release中选择对应的版本下载即可；

步骤三：配置

web.xml:

配置DispacherServlet
配置启动spring ioc容器的Listener

配置说明，可参考十二、springMVC整合spring

 <?xml version="1.0" encoding="UTF-8"?>
 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xmlns="http://xmlns.jcp.org/xml/ns/javaee"
     xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
     version="4.0">
     <context-param>
         <param-name>contextConfigLocation</param-name>
         <param-value>classpath:spring.xml</param-value>
     </context-param>
     <listener>
         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
     </listener>
     <!-- 配置DispatcherServlet(快捷键 alt +/) -->
     <servlet>
         <servlet-name>springDispatcherServlet</servlet-name>
         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
         <!-- 配置DispatcherServletd 一个初始化参数：配置springmvc配置文件的位置和名称 -->
         <!-- 实际上也可以不通过 contextConfigLocation 来配置Springmvc的配置文件，而是用默认的 即默认的配置文件为 
             /WEB-INF/<servlet-name>-servlet.xml 本项目默认位置配置文件即为： /WEB-INF/springDispatcherServlet-servlet.xml -->
         <init-param>
             <param-name>contextConfigLocation</param-name>
             <param-value>classpath:springmvc.xml</param-value>
         </init-param>
         <!-- 表示springDispatcherServlet在加载的时候被创建 -->
         <load-on-startup>1</load-on-startup>
     </servlet>
 
     <!-- Map all requests to the DispatcherServlet for handling -->
     <servlet-mapping>
         <servlet-name>springDispatcherServlet</servlet-name>
         <url-pattern>/</url-pattern>
     </servlet-mapping>
     
 </web-app>

springmvc.xml:

基础配置（扫描包配置+视图解析器配置+<mvc:annotation-driven></mvc:annotation-driven>）

配置说明，可参考十二、springMVC整合spring spring和springmvc 整合时对扫描包做了特殊处理，来解决重复扫描包启动时实例化两次的问题；

 <?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:mvc="http://www.springframework.org/schema/mvc"
     xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
         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">
 
 <!-- spirngmvc 只负责 网站跳转逻辑 -->
     <context:component-scan base-package="ssm" use-default-filters="false">
         <context:include-filter type="annotation"
             expression="org.springframework.stereotype.Controller" />
         <context:include-filter type="annotation"
             expression="org.springframework.stereotype.Service" />
     </context:component-scan>
 
     <bean
         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
         <property name="prefix" value="/WEB-INF/views/"></property>
         <property name="suffix" value=".jsp"></property>
     </bean>
     <mvc:annotation-driven></mvc:annotation-driven>
 </beans>

spring.xml:

扫描包配置+数据源配置+事务配置+mybatis配置；

扫描包配置：请参考十二、springMVC整合spring spring和springmvc 整合时对扫描包做了特殊处理，来解决重复扫描包启动时实例化两次的问题；

数据源配置：和四、JdbcTemplate的配置中的配置是一样的；

mybatis配置：

创建出 sqlSessionFactoryBean对象
配置一个可以进行批量执行的sqlSession
扫描所有的mapper接口的实现，让这些mapper能够自动注入

 <?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:tx="http://www.springframework.org/schema/tx"
     xmlns:context="http://www.springframework.org/schema/context"
     xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring"
     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
         http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.xsd
         http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
         http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.2.xsd">
 
     <!-- spring 希望管理所有的业务逻辑组件，等 -->
 
     <!-- 自动扫描配置 -->
     <context:component-scan base-package="ssm"
         use-default-filters="false">
         <context:exclude-filter type="annotation"
             expression="org.springframework.stereotype.Controller" />
         <context:exclude-filter type="annotation"
             expression="org.springframework.stereotype.Service" />
     </context:component-scan>
 
     <!-- spring用来控制业务逻辑。数据源、事务控制、aop... -->
     <!-- 导入资源文件 -->
     <context:property-placeholder
         location="classpath:dbconfig.properties" />
     <!-- 配置c3p0数据源 -->
     <bean id="datasource"
         class="com.mchange.v2.c3p0.ComboPooledDataSource">
         <property name="user" value="$jdbc.username"></property>
         <property name="password" value="$jdbc.password"></property>
         <property name="driverClass" value="$jdbc.driver"></property>
         <property name="jdbcUrl" value="$jdbc.url"></property>
     </bean>
     <!-- spring 事务管理器 -->
     <bean id="transactionManager"
         class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
         <property name="dataSource" ref="datasource"></property>
     </bean>
     <!-- 开启基于注解的事务 -->
     <tx:annotation-driven
         transaction-manager="transactionManager" />
 
     <!-- 整合mybatis目的： 1.spring管理所有组件。mapper的实现类。可以对service中引用dao的内容，可以为@Autowired 
         自动注入mapper； 2.spring用来管理声明式事务， -->
     <!-- 创建出 sqlSessionFactoryBean对象 -->
     <bean id="sqlSessionFactoryBean"
         class="org.mybatis.spring.SqlSessionFactoryBean">
         <property name="dataSource" ref="datasource"></property>
         <!-- configLocation指定全局配置文件的位置 -->
         <property name="configLocation"
             value="classpath:mybatis-config.xml"></property>
         <!-- 指定mapper位置（如果mapper与mapper接口的文件名不一样的话这里需要配置，若一样就可以不配置） -->
         <property name="mapperLocations"
             value="classpath:mapper/*.xml"></property>
     </bean>
     <!--配置一个可以进行批量执行的sqlSession -->
     <bean id="sqlSession"
         class="org.mybatis.spring.SqlSessionTemplate">
         <constructor-arg name="sqlSessionFactory"
             ref="sqlSessionFactoryBean"></constructor-arg>
         <constructor-arg name="executorType" value="BATCH"></constructor-arg>
     </bean>
     <!-- 扫描所有的mapper接口的实现，让这些mapper能够自动注入 -->
     <!-- <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> 配置SqlSessionFactoryBean的名称 
         <property name="basePackage" value="ssm.mapper" /> </bean> -->
     <mybatis-spring:scan base-package="ssm.mapper" />
 </beans>

dbconfig.properties：

 jdbc.driver=com.mysql.jdbc.Driver
 jdbc.url=jdbc:mysql://localhost:3306/mybatis
 jdbc.username=root
 jdbc.password=
 
 jdbc2.driver=com.mysql.jdbc.Driver
 jdbc2.url=jdbc:mysql://localhost:3306/mybatis2
 jdbc2.username=root
 jdbc2.password=

mybatis-config.xml：

具体的mybatis的全局配置文件说明请参看二、mybatis全局配置文件说明

 <?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>
     <!-- settings包含很多重要的设置项； name:设置项的名字，value设置项的取值 -->
     <settings>
         <!-- 开启驼峰命名 比如数据库字段为Last_Name 则 自动变为lastName -->
         <setting name="mapUnderscoreToCamelCase" value="true" />
         <!-- 分步查询配合一下两个配置 实现懒加载（按需加载） -->
         <setting name="lazyLoadingEnabled" value="true" />
         <setting name="aggressiveLazyLoading" value="false" />
     </settings>
     
     <!-- 配置顺序，properties settings typeAliases typeHandlers objectFactory objectWrapperFactory 
         reflectFactory plugings environment databaseIdProvider mappers -->
 </configuration>

log4j.properties:

  ### 设置###
 log4j.rootLogger = debug,stdout,D,E
  
 ### 输出信息到控制抬 ###
 log4j.appender.stdout = org.apache.log4j.ConsoleAppender
 log4j.appender.stdout.Target = System.out
 log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
 log4j.appender.stdout.layout.ConversionPattern = [%-5p] %dyyyy-MM-dd HH:mm:ss,SSS method:%l%n%m%n
  
 ### 输出DEBUG 级别以上的日志到=E://logs/error.log ###
 log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
 log4j.appender.D.File = E://logs/log.log
 log4j.appender.D.Append = true
 log4j.appender.D.Threshold = DEBUG 
 log4j.appender.D.layout = org.apache.log4j.PatternLayout
 log4j.appender.D.layout.ConversionPattern = %-dyyyy-MM-dd HH:mm:ss  [ %t:%r ] - [ %p ]  %m%n
  
 ### 输出ERROR 级别以上的日志到=E://logs/error.log ###
 log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
 log4j.appender.E.File =E://logs/error.log 
 log4j.appender.E.Append = true
 log4j.appender.E.Threshold = ERROR 
 log4j.appender.E.layout = org.apache.log4j.PatternLayout
 log4j.appender.E.layout.ConversionPattern = %-dyyyy-MM-dd HH:mm:ss  [ %t:%r ] - [ %p ]  %m%n
 ### 设置###
 log4j.rootLogger = debug,stdout,D,E
 
 ### 输出信息到控制抬 ###
 log4j.appender.stdout = org.apache.log4j.ConsoleAppender
 log4j.appender.stdout.Target = System.out
 log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
 log4j.appender.stdout.layout.ConversionPattern = [%-5p] %dyyyy-MM-dd HH:mm:ss,SSS method:%l%n%m%n
 
 ### 输出DEBUG 级别以上的日志到=E://logs/error.log ###
 log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
 log4j.appender.D.File = E://logs/log.log
 log4j.appender.D.Append = true
 log4j.appender.D.Threshold = DEBUG 
 log4j.appender.D.layout = org.apache.log4j.PatternLayout
 log4j.appender.D.layout.ConversionPattern = %-dyyyy-MM-dd HH:mm:ss  [ %t:%r ] - [ %p ]  %m%n
 
 ### 输出ERROR 级别以上的日志到=E://logs/error.log ###
 log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
 log4j.appender.E.File =E://logs/error.log 
 log4j.appender.E.Append = true
 log4j.appender.E.Threshold = ERROR 
 log4j.appender.E.layout = org.apache.log4j.PatternLayout
 log4j.appender.E.layout.ConversionPattern = %-dyyyy-MM-dd HH:mm:ss  [ %t:%r ] - [ %p ]  %m%n

代码部分：

EmployeeController.java:

 package ssm.controller;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.servlet.ModelAndView;
 
 import ssm.entity.Employee;
 import ssm.service.EmployeeService;
 
 @RequestMapping("/emp")
 @Controller
 public class EmployeeController 
     @Autowired
     private EmployeeService employeeService;
 
     @RequestMapping("/getEmp")
     public ModelAndView getById(Employee employee) 
         ModelAndView mv = new ModelAndView("success");
         mv.addObject("employee", employeeService.getEmpById(employee.getId()));
         return mv;

Employee.java

 package ssm.entity;
 
 public class Employee 
 
     private Integer id;
     private String lastName;
     private String email;
     private String gender;
 
     public Integer getId() 
         return id;
     
 
     public void setId(Integer id) 
         this.id = id;
     
 
     public String getLastName() 
         return lastName;
     
 
     public void setLastName(String lastName) 
         this.lastName = lastName;
     
 
     public String getEmail() 
         return email;
     
 
     public void setEmail(String email) 
         this.email = email;
     
 
     public String getGender() 
         return gender;
     
 
     public void setGender(String gender) 
         this.gender = gender;
     
 
     @Override
     public String toString() 
         return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender + "]";

EmployeeService.java

 package ssm.service;
 
 import ssm.entity.Employee;
 
 public interface EmployeeService 
 
     Employee getEmpById(Integer id);

EmployeeServiceImpl.java

 package ssm.service;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
 import ssm.entity.Employee;
 import ssm.mapper.EmployeeMapper;
 
 @Service("employeeService")
 public class EmployeeServiceImpl implements EmployeeService 
 
     @Autowired
     private EmployeeMapper employeeMapper;
 
     @Override
     public Employee getEmpById(Integer id) 
         return employeeMapper.getEmpById(id);

EmployeeMapper.java

 package ssm.mapper;
 
 import ssm.entity.Employee;
 
 public interface EmployeeMapper 
 
     Employee getEmpById(Integer id);

EmployeeMapper.xml:

 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE mapper
   PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
   "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 <mapper namespace="ssm.mapper.EmployeeMapper">
 
     <select id="getEmpById" resultType="ssm.entity.Employee">
         select * from tbl_employee
         where id=#id,jdbcType=INTEGER
     </select>
 </mapper>

success.jsp

 <%@ page language="java" contentType="text/html; charset=UTF-8"
     pageEncoding="UTF-8"%>
 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8">
 <title>Insert title here</title>
 </head>
 <body>
 <h3>success</h3>
 <p>$employee.id</p>
 
 </body>
 </html>

运行结果：

当运行http://localhost:8080/SSM/emp/getById?id=1 时，跳转到了success页面，且形式了当前的id;

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