使用Eclipse如何简单快速搭建SSM(springMVC+Spring+Mybatis)框架

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前言

SSM框架中有两个核心容器springMVC容器与spring IOC容器。
springMVC容器：负责管理springMVC，用于管理controller层，传递与页面交互的数据，负责映射和解析适配器。
spring IOC容器：具有依赖注入功能的容器，它可以创建对象，IOC 容器负责实例化、定位、配置应用程序中的对象及建立这些对象间的依赖。通常new一个实例，控制权由程序员控制，而"控制反转"是指new实例工作不由程序员来做而是交给容器来做。根据请求做具体的数据处理。

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一、SSM框架整合

1.创建项目

2.项目调整与配置

选中项目右键后选择properties

选中项目右键后选择javaee tools，点击generate…

3.注入依赖

在Maven Repository 库中搜索需要的依赖并复制，并在pom.xml文件中粘贴。

<properties><project.lombok.version>1.18.16</project.lombok.version><project.spring.version>5.2.12.RELEASE</project.spring.version><project.junit.version>4.12</project.junit.version><project.mysql.version>8.0.22</project.mysql.version><project.druid.version>1.2.4</project.druid.version><project.mybatis.version>3.5.6</project.mybatis.version><project.mybatis-spring.version>2.0.6</project.mybatis-spring.version><project.slf4j.version>1.7.30</project.slf4j.version><project.jackson.version>2.12.1</project.jackson.version></properties><dependencies><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>${project.lombok.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>${project.spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-orm</artifactId><version>${project.spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>${project.spring.version}</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>${project.junit.version}</version><scope>test</scope></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>${project.mysql.version}</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>${project.druid.version}</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>${project.mybatis.version}</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>${project.mybatis-spring.version}</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>${project.slf4j.version}</version></dependency><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>${project.jackson.version}</version></dependency></dependencies>

4.配置web.xml文件

在配置web.xml之前先创建配置springmvc的xml，和配置spring的xml
①先配置springmvc.xml


在namespace中勾选下三项

②配置spring.xml

③配置web.xml文件



下面附上完整的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_1.xsd"version="3.1"><display-name>ssm-demo</display-name><!-- 通过配置过滤器解决字符乱码问题 --><filter><filter-name>charsetFilter</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>charsetFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping><!-- 通过配置listener启动spring --><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring/mybatis/spring-*.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!-- 通过配置dispatcherservlet启动springmvc --><servlet><servlet-name>springDispatcherServlet</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring/mvc/springmvc-*.xml</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>springDispatcherServlet</servlet-name><url-pattern>/*</url-pattern></servlet-mapping>
</web-app>

5.配置springmvc-servlet.xml和spring-mybatis.xml

①配置springmvc-servlet.xml

<?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/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsdhttp://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd"><context:component-scan base-package="com.dyit.spring.controller"/>
<mvc:resources location="static/" mapping="static/**"></mvc:resources>
<mvc:annotation-driven/>
</beans>

context:component-scan 用来扫描controller类
mvc:resources放行静态资源
mvc:annotation-driven注解驱动json

②配置spring-mybatis.xml，配置mybatis需要的bean

<?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:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd"><context:component-scanbase-package="com.dyit.spring"><context:exclude-filter type="annotation"expression="com.dyit.spring.controller" /></context:component-scan><!-- 读取数据源配置信息 --><context:property-placeholderlocation="classpath:spring/mybatis/config/druid.properties" /><!-- 创造数据源配置对象 --><bean id="druidDataSource"class="com.alibaba.druid.pool.DruidDataSource"><property name="url" value="${druid.url}" /><property name="username" value="${druid.username}" /><property name="password" value="${druid.password}" /></bean><!-- 创建Session工厂 --><bean id="sqlSessionFactory"class="org.mybatis.spring.SqlSessionFactoryBean"><!-- 引入数据源 --><property name="dataSource" ref="druidDataSource" /><!-- Aliases取别名 --><property name="typeAliasesPackage"value="com.dyit.spring.entity" /><!-- 引入mapper --><property name="mapperLocations"value="classpath:mapper/*.mapper.xml"></property></bean><!-- 绑定Mybatis接口 --><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="basePackage" value="com.dyit.spring.mapper" /><property name="sqlSessionFactoryBeanName"value="sqlSessionFactory" /></bean><!-- 管理事务方式 --><bean id="txManager"class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="druidDataSource" /></bean><tx:annotation-driventransaction-manager="txManager" />
</beans>

6.创建实体类(以Car实体类为例)，ICarMapper接口和car.mapper.xml

package com.dyit.spring.entity;import org.apache.ibatis.type.Alias;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;@Alias("Car")
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Car {private Integer id;private String brand;private String color;private	Double price;
}

package com.dyit.spring.mapper;import java.util.List;import com.dyit.spring.entity.Car;public interface ICarMapper {void save(Car car);void update(Car car);void delete(int id);List<Car> FindAll();
}

<?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="com.dyit.spring.mapper.ICarMapper" ><!-- 定义映射规则 --><resultMap type="Car" id="carMap"><id property="id" column="car_id"/><result property="brand" column="car_brand"/><result property="color" column="car_color"/><result property="price" column="car_price"/></resultMap><insert id="save">INSERT INTO car_tab(car_brand,car_color,car_price) VALUES(#{brand},#{color},#{price})</insert><delete id="deleteById">DELETE FROM car_tab WHERE car_id = #{id}</delete><update id="update">UPDATE car_tab <set><if test="brand!=null">car_brand=#{brand},</if><if test="color!=null">car_color=#{color},</if><if test="price!=null">car_price=#{price}</if></set>WHERE car_id = #{id}</update><delete id="delete">DELETE FROM car_tab WHERE car_id = #{id}</delete><select id="findAll" resultMap="carMap">SELECT * FROM car_tab</select></mapper>

基本的SSM框架基本搭建完成，接下来创建controller和service层处理各项事务

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二、编写controller和service层

1.编写service层

①service接口

package com.dyit.spring.service;import java.util.List;import com.dyit.spring.entity.Car;public interface ICarService {void addCar(Car car);void updateCar(Car car);void deleteCarById(int id);List<Car> findAll();
}

②实现类

package com.dyit.spring.service.impl;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;import com.dyit.spring.entity.Car;
import com.dyit.spring.mapper.ICarMapper;
import com.dyit.spring.service.ICarService;@Transactional//spring-mybatis.xml中的事务管理
@Service
public class CarServiceImpl implements ICarService {@Autowiredprivate ICarMapper mapper;@Overridepublic void addCar(Car car) {mapper.save(car);}@Overridepublic void updateCar(Car car) {mapper.update(car);}@Overridepublic void deleteCarById(int id) {mapper.delete(id);}@Overridepublic List<Car> findAll() {return mapper.FindAll();}}

2.编写controller层

在编写controller层之前，先写一个返回给前端的信息类存放提示前端的信息。

package com.dyit.spring.dto;import java.util.Date;import com.fasterxml.jackson.annotation.JsonFormat;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@NoArgsConstructor
@AllArgsConstructor
public class HttpResp {private int code;private String msg;private Object results;@JsonFormat(pattern = "yyyy-MM-dd hh:mm:ss", timezone = "GMT+8")//设置时间的格式private Date time;
}

编写controller层

package com.dyit.spring.controller;import java.util.Date;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;import com.dyit.spring.dto.HttpResp;
import com.dyit.spring.entity.Car;
import com.dyit.spring.service.ICarService;@RequestMapping("/api")
@Controller
public class CarController {@Autowiredprivate ICarService ics;@PostMapping("/addCar")@ResponseBodypublic HttpResp addCar(Car car) {ics.addCar(car);return new HttpResp(2001, "添加车辆成功!", null, new Date());}@GetMapping("/findAll")@ResponseBodypublic HttpResp findAll() {return new HttpResp(2002, "查询车辆成功!", ics.findAll(), new Date());}@PutMapping("/updateCar")@ResponseBodypublic HttpResp updatCar(Car car) {ics.updateCar(car);return new HttpResp(2003, "更改车辆成功!", null, new Date());}@DeleteMapping("/deleteCar")@ResponseBodypublic HttpResp deleteCar(int id) {ics.deleteCarById(id);return new HttpResp(2001, "删除车辆成功!", null, new Date());}}

controller层编写完毕后，整个简单版的SSM框架就全部搭建完成了，下面通过post man进行测试。

3.结果演示

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