SSM全称Spring + SpringMVC +MyBatis，是目前比较主流的Java EE企业级框架，适用于搭建各种大型的企业级应用系统。

引入项目依赖,包括web, mybatis,数据库使用的是MySQL 8.0+

?xml version="1.0" encoding="UTF-8"?>    4.0.0            org.springframework.boot        spring-boot-starter-parent        2.1.6.RELEASE                 com.mike.boot.ssm    boot-ssm-1    0.0.1-SNAPSHOT    boot-ssm-1    Demo project for Spring Boot            1.8                            org.springframework.boot            spring-boot-starter-web                            org.mybatis.spring.boot            mybatis-spring-boot-starter            2.1.0                            org.springframework.boot            spring-boot-devtools            runtime            true                            mysql            mysql-connector-java                            org.projectlombok            lombok            true                            org.springframework.boot            spring-boot-starter-test            test                                                    org.springframework.boot                spring-boot-maven-plugin                                    true                                        

为了方便开发，这里引入了2个插件，devtools 和lombok的依赖。

(资料图片仅供参考)

devtools 用于热部署，即编辑完自动打包发布，IDE要使用devtools 要做一下的配置

• settings-build-compiler->勾选build project autoxxx选项

• shift+alt+ctrl+/ ->registry->勾选compiler.automake.allow.when.app.running

使用lombok则需要安装lombok的插件

*马赛克地方为测试无关代码

配置application.yml

spring:  datasource:    driver-class-name: com.mysql.cj.jdbc.Driver  # Driver    url: jdbc:mysql:///testdb?useSSL=true&serverTimezone=CTT #jdbc:mysql:///testdb?useSSL=true&serverTimezone=CTT    username: username    password: passwoordmybatis:  configuration:    map-underscore-to-camel-case: true  # book_id => bookId,book_name=> bookName  mapper-locations: classpath:mapper/*Mapper.xml # 指定Mapper映射路径  type-aliases-package: com.mike.boot.ssm.bootssm1.domain #定义别名　　

创建实体对象，由于使用了lombok，所以大大简化了getter和setter

mport lombok.AllArgsConstructor;import lombok.Data;import lombok.NoArgsConstructor;import java.math.BigDecimal;import java.util.Date;@Data@AllArgsConstructor@NoArgsConstructorpublic class BookInfo {    private Integer bookId;    private String bookName;    private String bookAuthor;    private BigDecimal bookPrice;    private Date bookDate;}

创建操作接口BookMapper.java并且添加@Mapper注解将class交给spring容器管理。

import com.mike.boot.ssm.bootssm1.domain.BookInfo;import org.apache.ibatis.annotations.Mapper;import java.util.List;@Mapper//将该接口的实体类对象交给springboot容器管理public interface BookMapper {    /**     * 根据ID获取书     * @param id     * @return     */    BookInfo getBookById(Integer id);    /**     * 保存     * @param bookInfo     * @return     */    int saveBook(BookInfo bookInfo);    /**     * 批量插入     * @param list     * @return     */    int saveBookBatch(List books);}

有了接口，还得配置SQL，在resource下创建mapper文件夹专门用来编辑SQL statement xml（BookInfoMapper.xml）,为什么是resource/mapper/下呢？因为我们再application.yml添加了配置

mybatis:  mapper-locations: classpath:mapper/*Mapper.xml

BookInfoMapper.xml内容如下：

            select  book_id,book_name,book_author,book_price,book_date        from  book        where book_id=#{id};                insert  book(book_name,book_author,book_price,book_date)        values(#{bookName},#{bookAuthor},#{bookPrice},#{bookDate});                insert  book(book_name,book_author,book_price,book_date)        values                    (#{val.bookName},#{val.bookAuthor},#{val.bookPrice},#{val.bookDate})            

注意这里的resultType是因为在application.yml里配置了别名所以可以这样使用

mybatis:  type-aliases-package: com.mike.boot.ssm.bootssm1.domain #定义别名

至此，一个基本的SSM项目搭建完成，添加测试代码，以selectOne为例查看效果

import com.mike.boot.ssm.bootssm1.domain.BookInfo;import com.mike.boot.ssm.bootssm1.mapper.BookMapper;import org.junit.Assert;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.boot.test.context.SpringBootTest;import org.springframework.test.context.junit4.SpringRunner;import javax.annotation.Resource;import java.math.BigDecimal;import java.text.DateFormat;import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Date;import java.util.List;@RunWith(SpringRunner.class)@SpringBootTestpublic class BootSsm1ApplicationTests {    @Resource    private BookMapper bookMapper;    @Test    public void selectOne() {        BookInfo bookInfo = bookMapper.getBookById(2);        System.out.println(bookInfo);    }    @Test    public void save() {        BookInfo bookInfo = new BookInfo();        bookInfo.setBookName("魔童降世");        bookInfo.setBookAuthor("佚名");        bookInfo.setBookPrice(new BigDecimal(40));        bookInfo.setBookDate(new Date(2019, 07, 26 ));        bookMapper.saveBook(bookInfo);    }    @Test    public void saveBatch() throws ParseException {        BookInfo bookInfo = new BookInfo();        bookInfo.setBookName("魔童降世3");        bookInfo.setBookAuthor("佚名3");        bookInfo.setBookPrice(new BigDecimal(40));        bookInfo.setBookDate(new SimpleDateFormat("yyyy-MM-dd").parse("2019-07-28"));        List books= new ArrayList<>();        books.add(bookInfo);        books.add(bookInfo);        int rows=bookMapper.saveBookBatch(books);        Assert.assertEquals(2,rows);    }}