新版

用Java类，全注解demo案例

1. AppConfig.java (Spring主配置类)package com.example.config;import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;@Configuration
@ComponentScan(basePackages = "com.example")
@Import({MyBatisConfig.class, WebConfig.class})
public class AppConfig {
}2. MyBatisConfig.java (MyBatis配置类)package com.example.config;import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DriverManagerDataSource;import javax.sql.DataSource;@Configuration
@MapperScan("com.example.dao")
public class MyBatisConfig {@Beanpublic DataSource dataSource() {DriverManagerDataSource dataSource = new DriverManagerDataSource();dataSource.setDriverClassName("com.mysql.cj.jdbc.Driver");dataSource.setUrl("jdbc:mysql://localhost:3306/your_database");dataSource.setUsername("your_username");dataSource.setPassword("your_password");return dataSource;}@Beanpublic SqlSessionFactory sqlSessionFactory() throws Exception {SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();factoryBean.setDataSource(dataSource());factoryBean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mappers/*.xml"));return factoryBean.getObject();}
}3. WebConfig.java (Spring MVC配置类)package com.example.config;import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;@Configuration
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {// 可以在这里添加自定义的Spring MVC配置
}4. web.xml (Web应用部署描述符)<?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/javaeehttp://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"version="4.0"><context-param><param-name>contextClass</param-name><param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value></context-param><context-param><param-name>contextConfigLocation</param-name><param-value>com.example.config.AppConfig</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><servlet><servlet-name>dispatcher</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><init-param><param-name>contextClass</param-name><param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value></init-param><init-param><param-name>contextConfigLocation</param-name><param-value>com.example.config.WebConfig</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>dispatcher</servlet-name><url-pattern>/</url-pattern></servlet-mapping></web-app>

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旧版本xml配置