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+pom.xml
+
+```xm
+<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/maven-v4_0_0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>com.mdd</groupId>
+  <artifactId>ssm</artifactId>
+  <packaging>war</packaging>
+  <version>1.0-SNAPSHOT</version>
+
+  <dependencies>
+    <!--  1 spring-webmvc-->
+    <dependency>
+      <groupId>org.springframework</groupId>
+      <artifactId>spring-webmvc</artifactId>
+      <version>5.2.25.RELEASE</version>
+    </dependency>
+    <dependency>
+      <!--  2 javax.servlet-api-->
+      <groupId>javax.servlet</groupId>
+      <artifactId>javax.servlet-api</artifactId>
+      <version>3.1.0</version>
+      <scope>provided</scope>
+    </dependency>
+    <!--    要使用json导入一个坐标jackson-->
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-databind</artifactId>
+      <version>2.9.1</version>
+    </dependency>
+
+    <!--        2.spring-jdbc -->
+    <dependency>
+      <groupId>org.springframework</groupId>
+      <artifactId>spring-jdbc</artifactId>
+      <version>5.2.25.RELEASE</version>
+    </dependency>
+    <dependency>
+      <groupId>org.springframework</groupId>
+      <artifactId>spring-test</artifactId>
+      <version>5.2.25.RELEASE</version>
+    </dependency>
+    <!--        4.mybatis-->
+    <dependency>
+      <groupId>org.mybatis</groupId>
+      <artifactId>mybatis</artifactId>
+      <version>3.5.13</version>
+    </dependency>
+    <!--        4.mybatis整合spring-->
+    <dependency>
+      <groupId>org.mybatis</groupId>
+      <artifactId>mybatis-spring</artifactId>
+      <version>2.0.5</version>
+    </dependency>
+    <!--mysql驱动-->
+    <dependency>
+      <groupId>com.mysql</groupId>
+      <artifactId>mysql-connector-j</artifactId>
+      <version>8.1.0</version>
+    </dependency>
+    <!--junit测试框架的坐标-->
+    <dependency>
+      <groupId>junit</groupId>
+      <artifactId>junit</artifactId>
+      <version>4.13.2</version>
+      <scope>test</scope>
+    </dependency>
+    <!--    阿里巴巴，drui 数据源连接池对应的坐标-->
+    <dependency>
+      <groupId>com.alibaba</groupId>
+      <artifactId>druid</artifactId>
+      <version>1.1.23</version>
+    </dependency>
+
+
+  </dependencies>
+
+
+
+  <build>
+    <!--   3 tomcat7-maven-plugin-->
+    <plugins>
+      <plugin>
+        <groupId>org.apache.tomcat.maven</groupId>
+        <artifactId>tomcat7-maven-plugin</artifactId>
+        <version>2.2</version>
+        <configuration>
+          <port>80</port>
+          <path>/</path>
+          <!--          解决请求中文乱码-->
+          <uriEncoding>utf-8</uriEncoding>
+        </configuration>
+      </plugin>
+
+    </plugins>
+  </build>
+</project>
+
+```
+
+src/main/java/com/mdd/config/SpringConfig.java
+
+```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 {
+}
+
+```
+
+src/main/java/com/mdd/config/MybatisConfig.java
+
+```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 {
+
+    //实体类，数据库连接
+    @Bean
+    public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){
+
+        SqlSessionFactoryBean ssfn = new SqlSessionFactoryBean();
+        ssfn.setDataSource(dataSource);
+        ssfn.setTypeAliasesPackage("com.mdd.domain");
+
+          return ssfn;
+
+    }
+
+    //mapper
+    @Bean
+    public MapperScannerConfigurer mapperScannerConfigurer(){
+
+        MapperScannerConfigurer msc = new MapperScannerConfigurer();
+        msc.setBasePackage("com.mdd.mapper");
+        return msc;
+
+    }
+
+
+
+}
+```
+
+src/main/java/com/mdd/config/JdbcConfig.java
+
+```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:///mybatis");
+        ds.setUsername("root");
+        ds.setPassword("root");
+
+        return ds;
+
+    }
+}
+
+```
+
+src/main/java/com/mdd/config/SpringMvcConfig.java
+
+```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;
+import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
+import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
+
+@Configuration
+@ComponentScan("com.mdd")
+@EnableWebMvc
+public class SpringMvcConfig implements WebMvcConfigurer {
+    @Override
+    public void addResourceHandlers(ResourceHandlerRegistry registry) {
+
+        //放行
+        registry.addResourceHandler("/css/**").addResourceLocations("/css/");
+        registry.addResourceHandler("/js/**").addResourceLocations("/js/");
+        registry.addResourceHandler("/lib/**").addResourceLocations("/lib/");
+        registry.addResourceHandler("/index.html").addResourceLocations("/index.html");
+        registry.addResourceHandler("/favicon.ico").addResourceLocations("/favicon.ico");
+
+    }
+
+    //ctrl+o(字母o) 重写方法
+        //    add+H 快捷方式
+
+}
+
+```
+
+src/main/java/com/mdd/config/WebConfig.java
+
+```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[]{"/"};
+    }
+}
+
+```
+
+src/main/java/com/mdd/controller/BookController.java
+
+```java
+package com.mdd.controller;
+
+import com.mdd.domain.Book;
+import com.mdd.domain.R;
+import com.mdd.service.BookService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.List;
+
+@RestController
+@RequestMapping("/books")
+public class BookController {
+
+    @Autowired
+    private BookService bookService;
+
+    //查看数据库数据,带提示词
+    @GetMapping
+    public R getAll(){
+        List<Book> books = bookService.getAll();
+        return R.success(200,books);
+    }
+
+    //查看数据库数据
+//   @GetMapping
+//    public List<Book> getAll(){
+//       return bookService.getAll();
+//   }
+
+
+   //添加数据
+   @PostMapping
+    //添加数据
+    public Book addBook(@RequestBody Book book){
+       bookService.addBook(book);
+       return book;
+
+    }
+
+    //修改数据
+    @PutMapping
+    public Book updateBook(@RequestBody Book book){
+       bookService.updateBook(book);
+       return book;
+    }
+
+    //删除
+    @DeleteMapping("/{id}")
+    public R deleteBookById(@PathVariable Integer id){
+       Integer i = bookService.deleteBook(id);
+        if (i>0) {
+            return R.success(200,"删除成功！");
+        }else{
+            return R.failure(404,"删除失败");
+        }
+
+    }
+
+    //根据id查询
+    @GetMapping("/{id}")
+    public Book getBook(@PathVariable Integer id){
+       return bookService.getBook(id);
+    }
+
+
+
+}
+```
+
+src/main/java/com/mdd/domain/Book.java
+
+```java
+package com.mdd.domain;
+
+public class Book {
+
+    private Integer id;
+    private String bookName;
+    private String author;
+    private String publisher;
+
+    @Override
+    public String toString() {
+        return "Book{" +
+                "id=" + id +
+                ", bookName='" + bookName + '\'' +
+                ", author='" + author + '\'' +
+                ", publisher='" + publisher + '\'' +
+                '}';
+    }
+
+    public Integer getId() {
+        return id;
+    }
+
+    public void setId(Integer id) {
+        this.id = id;
+    }
+
+    public String getBookName() {
+        return bookName;
+    }
+
+    public void setBookName(String bookName) {
+        this.bookName = bookName;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public String getPublisher() {
+        return publisher;
+    }
+
+    public void setPublisher(String publisher) {
+        this.publisher = publisher;
+    }
+
+    public Book(Integer id, String bookName, String author, String publisher) {
+        this.id = id;
+        this.bookName = bookName;
+        this.author = author;
+        this.publisher = publisher;
+    }
+
+    public Book() {
+    }
+}
+
+```
+
+src/main/java/com/mdd/domain/R.java
+
+```java
+package com.mdd.domain;
+
+public class R {
+
+    private Integer code;//错误代码
+    private String msg;//提示信息
+    private Object data;//返回的数据，Object通用的
+
+    @Override
+    public String toString() {
+        return "R{" +
+                "code=" + code +
+                ", msg='" + msg + '\'' +
+                ", data=" + data +
+                '}';
+    }
+
+    public Integer getCode() {
+        return code;
+    }
+
+    public void setCode(Integer code) {
+        this.code = code;
+    }
+
+    public String getMsg() {
+        return msg;
+    }
+
+    public void setMsg(String msg) {
+        this.msg = msg;
+    }
+
+    public Object getData() {
+        return data;
+    }
+
+    public void setData(Object data) {
+        this.data = data;
+    }
+
+    public R(Integer code, String msg, Object data) {
+        this.code = code;
+        this.msg = msg;
+        this.data = data;
+    }
+
+    public R() {
+    }
+
+    public static R success(Integer code, Object data) {
+        R r = new R();
+        r.setData(data);
+        r.setCode(code);
+        return r;
+    }
+
+    public static R success(Integer code,String msg){
+        R r = new R();
+        r.setCode(code);
+        r.setMsg(msg);
+        return r ;
+    }
+
+    public static R failure(Integer code,String msg){
+        R r = new R();
+        r.setMsg(msg);
+        r.setCode(code);
+        return r;
+    }
+    
+}
+
+```
+
+src/main/java/com/mdd/mapper/BookMapper.java
+
+```java
+package com.mdd.mapper;
+
+import com.mdd.domain.Book;
+import org.apache.ibatis.annotations.Delete;
+import org.apache.ibatis.annotations.Insert;
+import org.apache.ibatis.annotations.Select;
+import org.apache.ibatis.annotations.Update;
+
+import java.util.List;
+
+public interface BookMapper {
+
+
+    @Select("select id, book_name as bookName, author, publisher from tb_book order by id desc")
+    List<Book> getAll();
+
+    @Insert("insert into tb_book (book_name, author, publisher) values (#{bookName},#{author},#{publisher})")
+    void addBook(Book book);
+
+    @Update("update tb_book set book_name = #{bookName},author = #{author},publisher = #{publisher} where id = #{id}")
+    void updateBook(Book book);
+    @Delete("delete from tb_book where id = #{id};")
+    Integer deleteBook(Integer id);
+    @Select("select id, book_name as bookName, author, publisher from tb_book where id = #{id}")
+    Book getBook(Integer id);
+}
+
+```
+
+src/main/java/com/mdd/service/BookService.java
+
+```java
+package com.mdd.service;
+
+import com.mdd.domain.Book;
+
+import java.util.List;
+
+public interface BookService {
+    List<Book> getAll();
+
+    void addBook(Book book);
+
+    void updateBook(Book book);
+
+    Integer deleteBook(Integer id);
+
+    Book getBook(Integer id);
+}
+
+```
+
+src/main/java/com/mdd/service/Impl/BookServiceImpl.java
+
+```java
+package com.mdd.service.Impl;
+
+import com.mdd.domain.Book;
+import com.mdd.mapper.BookMapper;
+import com.mdd.service.BookService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+
+import java.util.List;
+
+@Service
+public class BookServiceImpl implements BookService {
+
+    @Autowired
+    private BookMapper bookMapper;
+
+    public List<Book> getAll() {
+        return bookMapper.getAll();
+    }
+
+    public void addBook(Book book) {
+        bookMapper.addBook(book);
+    }
+
+
+    public void updateBook(Book book) {
+        bookMapper.updateBook(book);
+    }
+
+
+    public Integer deleteBook(Integer id) {
+       return bookMapper.deleteBook(id);
+    }
+
+
+    public Book getBook(Integer id) {
+       return  bookMapper.getBook(id);
+    }
+}
+
+```
+
+记得在webapp文件李假如html文件
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