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+## config
+
+#### JdbcConfig（ 连接数据库）
+
+```java
+package com.mdd.config;
+
+import com.alibaba.druid.pool.DruidDataSource;
+import org.springframework.context.annotation.Bean;
+
+import javax.sql.DataSource;
+
+public class JdbcConfig {
+    @Bean
+    public DataSource dataSource(){
+        DruidDataSource ds = new DruidDataSource();
+        ds.setDriverClassName("com.mysql.cj.jdbc.Driver");
+        ds.setUrl("jdbc:mysql:///ssm");
+        ds.setUsername("root");
+        ds.setPassword("123456");
+        return ds;
+    }
+}
+
+```
+
+#### MyBatisConfig
+
+```java
+package com.mdd.config;
+
+import org.mybatis.spring.SqlSessionFactoryBean;
+import org.mybatis.spring.mapper.MapperScannerConfigurer;
+import org.springframework.context.annotation.Bean;
+
+import javax.sql.DataSource;
+
+public class MyBatisConfig {
+    @Bean
+    public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){
+        SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
+        ssfb.setDataSource(dataSource);
+        ssfb.setTypeAliasesPackage("com.mdd.domain");
+        return ssfb;
+    }
+    @Bean
+    public MapperScannerConfigurer mapperScannerConfigurer(){
+        MapperScannerConfigurer msc = new MapperScannerConfigurer();
+        msc.setBasePackage("com.mdd.mapper");
+        return msc;
+    }
+}
+
+```
+
+#### SpringConfig
+
+```java
+package com.mdd.config;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Import;
+
+@Configuration
+@ComponentScan({"com.mdd.mapper","com.mdd.service"})
+@Import({JdbcConfig.class, MyBatisConfig.class})
+public class SpringConfig {
+}
+
+```
+
+#### WebConfig（继承）
+
+```java
+
+package com.mdd.config;
+
+import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
+
+public class WebConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
+    @Override
+    protected Class<?>[] getRootConfigClasses() {
+        return new Class[]{SpringConfig.class};
+    }
+
+    @Override
+    protected Class<?>[] getServletConfigClasses() {
+        return new Class[]{SpringMvcConfig.class};
+    }
+
+    @Override
+    protected String[] getServletMappings() {
+        return new String[]{"/"};
+    }
+}
+
+```
+
+#### SpringMvcConfig
+
+```java
+package com.mdd.config;
+
+import org.springframework.context.annotation.ComponentScan;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+
+@Configuration
+@ComponentScan("com.mdd.controller")
+@EnableWebMvc
+public class SpringMvcConfig {
+}
+
+```
+
+## controller
+
+#### BrandController
+
+```java
+package com.mdd.controller;
+
+import com.mdd.domain.Brand;
+import com.mdd.service.BrandService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/brands")
+public class BrandController {
+    @Autowired
+    public BrandService brandService;
+
+    @GetMapping
+    public List<Brand> getAll(){
+       return brandService.getAll();
+    }
+
+    @PostMapping
+    public void addBrand(@RequestBody Brand brand){
+        brandService.addBrand(brand);
+    }
+}
+
+```
+
+## domain
+
+#### Brand
+
+```java
+package com.mdd.domain;
+
+public class Brand {
+   private Integer id;
+   private String name;
+   private String sex;
+   private Integer age;
+
+    @Override
+    public String toString() {
+        return "Brand{" +
+                "id=" + id +
+                ", name='" + name + '\'' +
+                ", sex='" + sex + '\'' +
+                ", age=" + age +
+                '}';
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getSex() {
+        return sex;
+    }
+
+    public void setSex(String sex) {
+        this.sex = sex;
+    }
+
+    public Integer getAge() {
+        return age;
+    }
+
+    public void setAge(Integer age) {
+        this.age = age;
+    }
+
+    public Brand(Integer id, String name, String sex, Integer age) {
+        this.id = id;
+        this.name = name;
+        this.sex = sex;
+        this.age = age;
+    }
+
+    public Brand() {
+    }
+}
+
+```
+
+## Mapper
+
+#### BrandMapper（mysql语句）
+
+```java
+package com.mdd.mapper;
+
+import com.mdd.domain.Brand;
+import org.apache.ibatis.annotations.Insert;
+import org.apache.ibatis.annotations.Select;
+
+import java.util.List;
+
+public interface BrandMapper {
+    @Select("select * from tb_brand order by id desc ")
+    List<Brand> getall();
+
+    @Insert("insert into tb_brand (name, sex, age) VALUES (#{name}, #{sex}, #{age})")
+    void addBrand(Brand brand);
+}
+
+```
+
+## Service
+
+### lmp
+
+#### BrandServiceImpl
+
+```java
+package com.mdd.service.imp;
+
+import com.mdd.domain.Brand;
+import com.mdd.mapper.BrandMapper;
+import com.mdd.service.BrandService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+import java.util.List;
+
+@Service
+public class BrandServiceImpl implements BrandService {
+    @Autowired
+    public BrandMapper brandMapper;
+    @Override
+    public List<Brand> getAll() {
+        return brandMapper.getall();
+    }
+
+    public void addBrand(Brand brand) {
+        brandMapper.addBrand(brand);
+    }
+}
+
+```
+
+#### BrandService
+
+```java
+package com.mdd.service;
+
+import com.mdd.domain.Brand;
+
+import java.util.List;
+
+public interface BrandService {
+    List<Brand> getAll();
+
+    void addBrand(Brand brand);
+}
+
+```
+
+