SSM 整合(Spring + MyBatis；Spring + Spring MVC)

1. SSM 整合(Spring + MyBatis；Spring + Spring MVC)

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2. 引入相关依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><packaging>war</packaging><groupId>com.rainbowsea</groupId><artifactId>ssm-annotation</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>17</maven.compiler.source><maven.compiler.target>17</maven.compiler.target></properties><dependencies><!--springmvc--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>6.1.4</version></dependency><!--spring jdbc--><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>6.1.4</version></dependency><!--mybatis--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.15</version></dependency><!--mybatis spring--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>3.0.3</version></dependency><!--mysql驱动--><dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId><version>8.3.0</version></dependency><!--德鲁伊连接池--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.2.22</version></dependency><!--jackson--><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.17.0</version></dependency><!--servlet api--><dependency><groupId>jakarta.servlet</groupId><artifactId>jakarta.servlet-api</artifactId><version>6.0.0</version><scope>provided</scope></dependency><!--logback--><dependency><groupId>ch.qos.logback</groupId><artifactId>logback-classic</artifactId><version>1.5.3</version></dependency><!--thymeleaf和spring6的整合依赖--><dependency><groupId>org.thymeleaf</groupId><artifactId>thymeleaf-spring6</artifactId><version>3.1.2.RELEASE</version></dependency></dependencies></project>

3. SSM 整合

3.1 创建包结构

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SSM：包括 Spring ，MyBatis，Spring MVC

SSM 的整合：可以大致分为两部分：

• Spring + MyBatis 的整合
• Spring + Spring MVC 的整合

4. Spring 整合 + MyBatis

4.1 编写 jdbc.properties

在类根路径下创建属性配置文件，配置连接数据库的信息：jdbc.properties

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/springmvc
jdbc.username=root
jdbc.password=MySQL123

4.2 编写 DataSourceConfig 数据源配置

package com.rainbowsea.ssm.config;import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;/*** 数据源配置*/
@Configuration
public class DataSourceConfig {@Value("${jdbc.driver}")private String driver;@Value("${jdbc.url}")private String url;@Value("${jdbc.username}")private String username;@Value("${jdbc.password}")private String password;public DataSourceConfig() {}public DataSourceConfig(String driver, String url, String username, String password) {this.driver = driver;this.url = url;this.username = username;this.password = password;}@Beanpublic DataSource dataSource() {DruidDataSource druidDataSource = new DruidDataSource();druidDataSource.setDriverClassName(driver);druidDataSource.setUrl(url);druidDataSource.setUsername(username);druidDataSource.setPassword(password);return druidDataSource;}
}

4.3 编写 MyBatisConfig 的配置类(替换 mybatis的xml配置文件)

package com.rainbowsea.ssm.config;import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import javax.sql.DataSource;@Configuration
public class MyBatisConfig {@Beanpublic SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource) {SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();sqlSessionFactoryBean.setDataSource(dataSource);sqlSessionFactoryBean.setTypeAliasesPackage("com.rainbowsea.ssm.bean");return sqlSessionFactoryBean;}@Beanpublic MapperScannerConfigurer mapperScannerConfigurer() {MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();mapperScannerConfigurer.setBasePackage("com.rainbowsea.ssm.dao");return mapperScannerConfigurer;}
}

4.4 编写 SpringConfig 的配置类(替换spring的xml配置文件)

package com.rainbowsea.ssm.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;import javax.sql.DataSource;// 标注该类式一个配置文件类
@Configuration
// 组件扫描
@ComponentScan("com.rainbowsea.ssm.service")
// 属性配置文件位置
@PropertySource("classpath:jdbc.properties")
// 导入其他配置到Spring 配置
@Import({MyBatisConfig.class,DataSourceConfig.class})
// 开启事务管理器
@EnableTransactionManagement
public class SpringConfig {// 在 DataSourceConfig中添加事务管理器对象@Beanpublic PlatformTransactionManager platformTransactionManager(DataSource dataSource){DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager();dataSourceTransactionManager.setDataSource(dataSource);return dataSourceTransactionManager;}
}

5. Spring 整合 Spring MVC

5.1 编写WebAppInitializer（替换 web.xml 文件）

package com.rainbowsea.ssm.config;import jakarta.servlet.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.filter.HiddenHttpMethodFilter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;@Configuration
public class WebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {/*** Spring的配置** @return*/@Overrideprotected Class<?>[] getRootConfigClasses() {return new Class[]{SpringConfig.class};}/*** SpringMVC的配置** @return*/@Overrideprotected Class<?>[] getServletConfigClasses() {return new Class[]{SpringMvcConfig.class};}/*** 用来配置DispatcherServlet的 <url-pattern>** @return*/@Overrideprotected String[] getServletMappings() {return new String[]{"/"};}/*** 配置过滤器** @return*/@Overrideprotected Filter[] getServletFilters() {// 配置字符编码过滤器CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();characterEncodingFilter.setEncoding("UTF-8");characterEncodingFilter.setForceResponseEncoding(true);characterEncodingFilter.setForceRequestEncoding(true);// 配置HiddenHttpMethodFilterHiddenHttpMethodFilter hiddenHttpMethodFilter = new HiddenHttpMethodFilter();return new Filter[]{characterEncodingFilter, hiddenHttpMethodFilter};}
}

5.2 编写 SpringMvcConfig 类(替换spring mvc 的xml 配置文件)

package com.rainbowsea.ssm.config;import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.thymeleaf.spring6.SpringTemplateEngine;
import org.thymeleaf.spring6.templateresolver.SpringResourceTemplateResolver;
import org.thymeleaf.spring6.view.ThymeleafViewResolver;
import org.thymeleaf.templatemode.TemplateMode;
import org.thymeleaf.templateresolver.ITemplateResolver;import java.util.List;@Configuration  // 标志是配置文件类
@ComponentScan("com.rainbowsea.ssm.handler")
@EnableWebMvc
public class SpringMvcConfig implements WebMvcConfigurer {// 以下三个方法合并起来就是开启视图解析器@Beanpublic ThymeleafViewResolver getViewResolver(SpringTemplateEngine springTemplateEngine) {ThymeleafViewResolver resolver = new ThymeleafViewResolver();resolver.setTemplateEngine(springTemplateEngine);resolver.setCharacterEncoding("UTF-8");resolver.setOrder(1);return resolver;}@Beanpublic SpringTemplateEngine templateEngine(ITemplateResolver iTemplateResolver) {SpringTemplateEngine templateEngine = new SpringTemplateEngine();templateEngine.setTemplateResolver(iTemplateResolver);return templateEngine;}@Beanpublic ITemplateResolver templateResolver(ApplicationContext applicationContext) {SpringResourceTemplateResolver resolver = new SpringResourceTemplateResolver();resolver.setApplicationContext(applicationContext);resolver.setPrefix("/WEB-INF/thymeleaf/");resolver.setSuffix(".html");resolver.setTemplateMode(TemplateMode.HTML);resolver.setCharacterEncoding("UTF-8");resolver.setCacheable(false);//开发时关闭缓存，改动即可生效.发布时，打开return resolver;}// 开启静态资源处理，开启默认的Servlet处理@Overridepublic void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {configurer.enable();}// 视图控制器@Overridepublic void addViewControllers(ViewControllerRegistry registry) {registry.addViewController("/").setViewName("index");}// 配置异常处理器@Overridepublic void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) {}// 配置拦截器@Overridepublic void addInterceptors(InterceptorRegistry registry) {}
}

5.3 添加事务控制

第一步：在SpringConfig中开启事务管理器

@EnableTransactionManagement
public class SpringConfig {
}

第二步：在DataSourceConfig中添加事务管理器对象

@Bean
public PlatformTransactionManager platformTransactionManager(DataSource dataSource){DataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager();dataSourceTransactionManager.setDataSource(dataSource);return dataSourceTransactionManager;
}

第三步：在service类上添加如下注解：(如果有的话)

@Transactional
public class UserService {}

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6. 实现功能测试ssm整合

6.1 准备数据表

6.2 pojo类编写

package com.rainbowsea.ssm.bean;import org.springframework.stereotype.Controller;@Controller
public class User {private Long id;private String name;private String password;private String email;public User() {}public User(Long id, String name, String password, String email) {this.id = id;this.name = name;this.password = password;this.email = email;}public Long getId() {return id;}public void setId(Long id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}
}

6.3 dao编写

package com.rainbowsea.ssm.dao;import com.rainbowsea.ssm.bean.User;
import org.apache.ibatis.annotations.Select;public interface UserDao {@Select("select * from tbl_user where id = #{id}")User selectById(Long id);}

6.4 service编写

package com.rainbowsea.ssm.service;import com.rainbowsea.ssm.bean.User;public interface UserService {/*** 根据用户id获取用户信息*/User getById(Long id);
}

package com.rainbowsea.ssm.service.impl;import com.rainbowsea.ssm.bean.User;
import com.rainbowsea.ssm.dao.UserDao;
import com.rainbowsea.ssm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;@Service
public class UserServiceImpl implements UserService {@Autowiredprivate UserDao userDao;@Overridepublic User getById(Long id) {return userDao.selectById(id);}
}

6.5 handler编写

package com.rainbowsea.ssm.handler;import com.rainbowsea.ssm.bean.User;
import com.rainbowsea.ssm.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;@RestController
@RequestMapping("/users")
public class UserHandler {@Autowiredprivate UserService userService;@GetMapping("/{id}")public User detail(@PathVariable("id") Long id){User user = userService.getById(id);return user;}
}

6.6 前端发送ajax

6.6.1 引入 js 文件

6.6.2 开启静态资源处理

@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {configurer.enable();
}

6.6.3 视图控制器

public void addViewControllers(ViewControllerRegistry registry) {registry.addViewController("/").setViewName("index");
}

6.6.4 编写ajax

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>ssm整合</title><!--引入vue--><script th:src="@{/static/js/vue3.4.21.js}"></script><!--引入axios--><script th:src="@{/static/js/axios.min.js}"></script>
</head>
<body>
<div id="app"><button @click="getMessage">查看id=1的用户信息</button><h1>{{message}}</h1>
</div>
<script th:inline="javascript">Vue.createApp({data(){return {message : ''}},methods : {async getMessage(){let response = await axios.get([[@{/}]] + 'users/1')this.message = response.data}}}).mount("#app")
</script>
</body>
</html>

7. 运行启动 Tomcat 测试

8. 最后：

“在这个最后的篇章中，我要表达我对每一位读者的感激之情。你们的关注和回复是我创作的动力源泉，我从你们身上吸取了无尽的灵感与勇气。我会将你们的鼓励留在心底，继续在其他的领域奋斗。感谢你们，我们总会在某个时刻再次相遇。”