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标题: SSM（Spring+SpringMVC+MyBatis）框架集成 [打印本页]

作者: tsx81429 时间: 2023-10-11 09:05
标题: SSM（Spring+SpringMVC+MyBatis）框架集成
引言

进行SSM（Spring+SpringMVC+MyBatis）集成的主要原因是为了提高开发效率和代码可维护性。SSM是一套非常流行的Java Web开发框架，它集成了Spring框架、SpringMVC框架和MyBatis框架，各自发挥优势，形成了一个完整的开发框架。
首先，使用Spring框架可以实现组件的解耦和依赖注入，通过配置文件进行Bean的管理和控制反转（IoC），从而提供了良好的扩展性和灵活性。Spring提供了事务管理、AOP（面向切面编程）等功能，使得开发者可以更加方便地进行业务逻辑的编写和管理。
其次，SpringMVC框架是一种基于MVC（Model-View-Controller）模式的Web框架，它通过DispatcherServlet来统一管理请求和响应。SpringMVC提供了请求处理的注解方式，可以简化开发流程，同时具备良好的可扩展性和灵活性。开发者可以通过配置文件进行路由、参数绑定、数据校验等操作，从而编写出结构清晰、易于维护的代码。
最后，MyBatis是一款优秀的持久层框架，它通过XML文件或注解来实现数据库操作的映射，具有简单易用、性能高效等特点。MyBatis提供了丰富的CRUD（增删改查）操作和事务管理功能，开发者可以灵活地编写数据库相关的代码。

综上所述，SSM集成可以充分发挥各个框架的优势，提供了一种高效、灵活、易于维护的开发方式，使得Java Web开发更加方便和高效。通过SSM的集成，开发者可以快速搭建起一个稳定可靠的Web应用，并且在后续的开发和维护过程中，能够更加方便地处理业务需求和数据库操作。
创建数据库表

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;
-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
`age` int(11) NULL DEFAULT NULL,
`gender` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 1 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;
SET FOREIGN_KEY_CHECKS = 1;

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在IEDA中创建Maven Web项目

选择File ---> New ---> Project

选择Maven模板

填写项目的基本信息 ---> Next

配置自己的Maven环境 ---> Finish

修改pom.xml配置，添加Maven依赖

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
<spring.version>5.3.6</spring.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.16.18</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>2.0.1.Final</version>
</dependency>
<dependency>
<groupId>org.hibernate.validator</groupId>
<artifactId>hibernate-validator</artifactId>
<version>6.0.16.Final</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.11.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.11.4</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.5</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.5</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.25</version>
</dependency>
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
</dependency>
</dependencies>

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创建IoC 容器 springmvc.xml文件

在src/main/resources文件夹下创建 springmvc.xml文件

<?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.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<mvc:annotation-driven />
<context:component-scan base-package="com.qrj"/>
<mvc:default-servlet-handler />
<mvc:cors>
<mvc:mapping path="/**" />
</mvc:cors>
</beans>

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创建数据库配置文件database.properties

在src/main/resources文件夹下创建database.properties文件

db.driver=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/spring_mybatis?useSSL=false
db.username=root
db.password=123456

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创建Spring IoC容器spring-config.xml文件

在src/main/resources文件夹下创建spring-config.xml文件

<?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.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<mvc:annotation-driven />
<context:component-scan base-package="com.qrj"/>
<mvc:default-servlet-handler />
<mvc:cors>
<mvc:mapping path="/**" />
</mvc:cors>
</beans><?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.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<mvc:annotation-driven />
<context:component-scan base-package="com.qrj"/>
<mvc:default-servlet-handler />
<mvc:cors>
<mvc:mapping path="/**" />
</mvc:cors>
</beans>

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创建logback.xml日志配置文件

在src/main/resources文件夹下创建logback.xml文件

logback DEBUG %d{HH:mm:ss.SSS} %contextName [%thread] %-5level %logger{36} - %msg%n ${log.path} ${log.path}.%d{yyyy-MM-dd}.zip %date %level [%thread] %logger{36} [%file : %line] %msg%n<?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.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<mvc:annotation-driven />
<context:component-scan base-package="com.qrj"/>
<mvc:default-servlet-handler />
<mvc:cors>
<mvc:mapping path="/**" />
</mvc:cors>
</beans>

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修改web.xml文件

<?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">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-config.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<filter>
<filter-name>characterEncodingFilter</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>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>

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创建UserEntity实体类

在src/main/java目录下创建com.qrj.entity包，在包下面创建UserEntity实体类。

package com.qrj.entity;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @author: qrj
* @description 用户实体类
* @Date: 2023/9/19 14:51
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class UserEntity {
private Integer id;
private String name;
private Integer age;
private String gender;
}

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创建UserDto参数类

在src/main/java目录下创建com.qrj.dto包，在包下面创建UserDto参数类。

package com.qrj.dto;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
/**
* @author: qrj
* @description 用户参数
* @Date: 2023/9/19 14:52
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class UserDto {
private Integer id;
private String name;
private Integer age;
private String gender;
}

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创建UserMapper接口

在src/main/java目录下创建com.qrj.dao包，在包下面创建UserMapper接口。

package com.qrj.dao;
import com.qrj.dto.UserDto;
import com.qrj.entity.UserEntity;
import java.util.List;
/**
* @author: qrj
* @description 用户映射接口
* @Date: 2023/9/19 14:52
*/
public interface UserMapper {
void insert(UserDto user);
List<UserEntity> getList();
}

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创建UserMapper.xml映射文件

注意这里创建的UserMapper映射文件要和之前创建的UserMapper接口文件相对应。
在src/main/resources文件夹下创建mapper文件夹，并在mapper文件夹下创建UserMapper.xml映射文件。

<?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.qrj.dao.UserMapper">
<insert id="insert" parameterType="com.qrj.entity.UserEntity" keyProperty="id" useGeneratedKeys="true">
INSERT INTO USER ( name, age, gender )
VALUE
( #{name}, #{age} , #{gender} )
</insert>
<select id="getList" resultType="com.qrj.entity.UserEntity">
SELECT
*
FROM
USER;
</select>
</mapper>

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创建ResultVo工具类

在src/main/java目录下创建com.qrj.vo包，在包下面创建ResultVo工具类。

package com.qrj.vo;
import lombok.Data;
import java.io.Serializable;
/**
* @author: qrj
* @description Ajax 请求统一响应工具类
* @Date: 2023/9/19 14:58
*/
@Data
public class ResultVo<T> implements Serializable {
private static final long serialVersionUID = 1L;
//状态码
private int code;
//状态码描述
private String message;
//数据结果，泛型，可以是列表、单个对象、数字、布尔值等
private T data;
public ResultVo() {
}
public ResultVo(int code, String message) {
this.code = code;
this.message = message;
}
public static <T> ResultVo<T> success(T data) {
ResultVo<T> resultVo = new ResultVo<>();
resultVo.setCode(200);
resultVo.setMessage("ok");
resultVo.setData(data);
return resultVo;
}
}

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创建IUserService接口和UserServiceImpl实现类

在src/main/java目录下创建com.qrj.service包，在包中创建IUserService接口

package com.qrj.service;
import com.qrj.dto.UserDto;
import com.qrj.entity.UserEntity;
import java.util.List;
/**
* @author: qrj
* @description 用户业务接口
* @Date: 2023/9/19 14:54
*/
public interface IUserService {
UserEntity insert(UserDto user);
List<UserEntity> getList();
}

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在com.qrj.service包下创建Impl包，并创建UserServiceImpl实现类

package com.qrj.service.Impl;
import com.qrj.dao.UserMapper;
import com.qrj.dto.UserDto;
import com.qrj.entity.UserEntity;
import com.qrj.service.IUserService;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import javax.annotation.Resource;
import java.util.List;
/**
* @author: qrj
* @description 用户业务实现类
* @Date: 2023/9/19 14:57
*/
@Service //控制反转
public class UserServiceImpl implements IUserService {
@Resource //依赖注入
private UserMapper userMapper;
@Transactional(rollbackFor = Exception.class)
@Override
public UserEntity insert(UserDto user) {
userMapper.insert(user);
UserEntity userEntity = new UserEntity();
//BeanUtils用于拷贝对象参数1：被拷贝的对象参数2：拷贝对象
BeanUtils.copyProperties(user,userEntity);
return userEntity;
}
@Transactional
@Override
public List<UserEntity> getList() {
List<UserEntity> list = userMapper.getList();
return list;
}
}

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创建UserController页面控制器

在src/main/java目录下创建com.qrj.controller包，在包下面创建UserController页面控制器。

package com.qrj.controller;
import com.qrj.dto.UserDto;
import com.qrj.entity.UserEntity;
import com.qrj.service.IUserService;
import com.qrj.vo.ResultVo;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import java.util.List;
/**
* @author: qrj
* @description 用户页面控制器
* @Date: 2023/9/19 14:53
*/
@RestController
@Slf4j //lombok提供的日志注解
public class UserController {
@Resource //使用 @Autowired注解 IDEA不推荐
private IUserService userService;
@PostMapping("/user")
public ResultVo<UserEntity> addUser(@RequestBody UserDto userDto) {
log.debug(userDto.toString()); //打印调试日志(接收参数)
UserEntity result = userService.insert(userDto);
log.debug(result.toString()); //打印调试日志(响应数据)
return ResultVo.success(result);
}
@GetMapping("/users")
public ResultVo<List<UserEntity>> getUsers() {
List<UserEntity> list = userService.getList();
return ResultVo.success(list);
}
}

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启动Tomcat，在Postman下进行接口测试

通过Restful API接口（"/user"）测试添加用户功能实现

通过Restful API接口（"/users"）测试查找所有用户功能实现

以上功能测试完成，至此SSM框架集成成功！

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