基于SpringBoot的SSM整合案例 -- SpringBoot快速入门保姆级教程（四）

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前言

为了巩固所学的知识，作者尝试着开始发布一些学习笔记类的博客，方便日后回顾。当然，如果能帮到一些萌新进行新技术的学习那也是极好的。作者菜菜一枚，文章中如果有记录错误，欢迎读者朋友们批评指正。
（博客的参考源码可以在我主页的资源里找到，如果在学习的过程中有什么疑问欢迎大家在评论区向我提出）

建议先去浏览本人ssm专栏发布的ssm快速入门案例（一）（二）后再阅读本文章

四、基于SpringBoot的SSM整合案例

1.设计创建数据库表tbl_book

-- ----------------------------
-- Table structure for tbl_book
-- ----------------------------
DROP TABLE IF EXISTS `tbl_book`;
CREATE TABLE `tbl_book`  (`id` int(11) NOT NULL AUTO_INCREMENT,`type` varchar(20) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,`name` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,`description` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 13 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;-- ----------------------------
-- Records of tbl_book
-- ----------------------------
INSERT INTO `tbl_book` VALUES (1, '计算机理论', 'Spring实战 第5版', 'Spring入门经典教程，深入理解Spring原理技术内幕');
INSERT INTO `tbl_book` VALUES (2, '计算机理论', 'Spring 5核心原理与30个类手写实战', '十年沉淀之作，手写Spring精华思想');
INSERT INTO `tbl_book` VALUES (3, '计算机理论', 'Spring 5 设计模式', '深入Spring源码剖析Spring源码中蕴含的10大设计模式');
INSERT INTO `tbl_book` VALUES (4, '计算机理论', 'Spring MVC+MyBatis开发从入门到项目实战', '全方位解析面向Web应用的轻量级框架，带你成为Spring MVC开发高手');
INSERT INTO `tbl_book` VALUES (5, '计算机理论', '轻量级Java Web企业应用实战', '源码级剖析Spring框架，适合已掌握Java基础的读者');
INSERT INTO `tbl_book` VALUES (6, '计算机理论', 'Java核心技术 卷I 基础知识（原书第11版）', 'Core Java 第11版，Jolt大奖获奖作品，针对Java SE9、10、11全面更新');
INSERT INTO `tbl_book` VALUES (7, '计算机理论', '深入理解Java虚拟机', '5个维度全面剖析JVM，大厂面试知识点全覆盖');
INSERT INTO `tbl_book` VALUES (8, '计算机理论', 'Java编程思想（第4版）', 'Java学习必读经典,殿堂级著作！赢得了全球程序员的广泛赞誉');
INSERT INTO `tbl_book` VALUES (9, '计算机理论', '零基础学Java（全彩版）', '零基础自学编程的入门图书，由浅入深，详解Java语言的编程思想和核心技术');
INSERT INTO `tbl_book` VALUES (10, '市场营销', '直播就该这么做：主播高效沟通实战指南', '李子柒、李佳琦、薇娅成长为网红的秘密都在书中');
INSERT INTO `tbl_book` VALUES (11, '市场营销', '直播销讲实战一本通', '和秋叶一起学系列网络营销书籍');
INSERT INTO `tbl_book` VALUES (12, '市场营销', '直播带货：淘宝、天猫直播从新手到高手', '一本教你如何玩转直播的书，10堂课轻松实现带货月入3W+');

2.创建新的SpringBoot模块，勾选相关依赖

3. 添加SpringBoot创建项目时没有提供的相关坐标

<dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.16</version></dependency>

4.根据数据库表创建实体类Book

public class Book {//此处省略gettr、setter和toString方法private Integer id;private String type;private String name;private String description;

5.编写dao层操作BookDao

@Mapper
public interface BookDao {@Insert("insert into tbl_book (type,name,description) values(#{type},#{name},#{description})")public int save(Book book);@Update("update tbl_book set type = #{type}, name = #{name}, description = #{description} where id = #{id}")public int update(Book book);@Delete("delete from tbl_book where id = #{id}")public int delete(Integer id);@Select("select * from tbl_book where id = #{id}")public Book getById(Integer id);@Select("select * from tbl_book")public List<Book> getAll();
}

6.编写Service服务层接口BookService

@Transactional
public interface BookService {/*** 保存* @param book* @return*/public boolean save(Book book);/*** 修改* @param book* @return*/public boolean update(Book book);/*** 按id删除* @param id* @return*/public boolean delete(Integer id);/*** 按id查询* @param id* @return*/public Book getById(Integer id);/*** 查询全部* @return*/public List<Book> getAll();
}

7.编写服务层实现类BookServiceImpl

@Service
public class BookServiceImpl implements BookService {@Autowiredprivate BookDao bookDao;public boolean save(Book book) {return bookDao.save(book) > 0;}public boolean update(Book book) {return bookDao.update(book) > 0;}public boolean delete(Integer id) {return bookDao.delete(id) > 0;}public Book getById(Integer id) {if(id == 1){throw new BusinessException(Code.BUSINESS_ERR,"请不要使用你的技术挑战我的耐性!");}
//        //将可能出现的异常进行包装，转换成自定义异常
//        try{
//            int i = 1/0;
//        }catch (Exception e){
//            throw new SystemException(Code.SYSTEM_TIMEOUT_ERR,"服务器访问超时，请重试!",e);
//        }return bookDao.getById(id);}public List<Book> getAll() {return bookDao.getAll();}
}

8.编写Book模块Controller层BookController

@RestController
@RequestMapping("/books")
public class BookController {@Autowiredprivate BookService bookService;@PostMappingpublic Result save(@RequestBody Book book) {boolean flag = bookService.save(book);return new Result(flag ? Code.SAVE_OK:Code.SAVE_ERR,flag);}@PutMappingpublic Result update(@RequestBody Book book) {boolean flag = bookService.update(book);return new Result(flag ? Code.UPDATE_OK:Code.UPDATE_ERR,flag);}@DeleteMapping("/{id}")public Result delete(@PathVariable Integer id) {boolean flag = bookService.delete(id);return new Result(flag ? Code.DELETE_OK:Code.DELETE_ERR,flag);}@GetMapping("/{id}")public Result getById(@PathVariable Integer id) {Book book = bookService.getById(id);Integer code = book != null ? Code.GET_OK : Code.GET_ERR;String msg = book != null ? "" : "数据查询失败，请重试！";return new Result(code,book,msg);}@GetMappingpublic Result getAll() {List<Book> bookList = bookService.getAll();Integer code = bookList != null ? Code.GET_OK : Code.GET_ERR;String msg = bookList != null ? "" : "数据查询失败，请重试！";return new Result(code,bookList,msg);}
}

9.状态码类相关设计

• Code类

package org.example.controller;public class Code {public static final Integer SAVE_OK = 20011;public static final Integer DELETE_OK = 20021;public static final Integer UPDATE_OK = 20031;public static final Integer GET_OK = 20041;public static final Integer SAVE_ERR = 20010;public static final Integer DELETE_ERR = 20020;public static final Integer UPDATE_ERR = 20030;public static final Integer GET_ERR = 20040;public static final Integer SYSTEM_ERR = 50001;public static final Integer SYSTEM_TIMEOUT_ERR = 50002;public static final Integer SYSTEM_UNKNOW_ERR = 59999;public static final Integer BUSINESS_ERR = 60002;}

• ProjectExceptionAdvice类

@RestControllerAdvice
public class ProjectExceptionAdvice {@ExceptionHandler(SystemException.class)public Result doSystemException(SystemException ex){//记录日志//发送消息给运维//发送邮件给开发人员,ex对象发送给开发人员return new Result(ex.getCode(),null,ex.getMessage());}@ExceptionHandler(BusinessException.class)public Result doBusinessException(BusinessException ex){return new Result(ex.getCode(),null,ex.getMessage());}@ExceptionHandler(Exception.class)public Result doOtherException(Exception ex){//记录日志//发送消息给运维//发送邮件给开发人员,ex对象发送给开发人员return new Result(Code.SYSTEM_UNKNOW_ERR,null,"系统繁忙，请稍后再试！");}
}

• Result类

public class Result {//此处省略getter、setter方法private Object data;private Integer code;private String msg;public Result() {}public Result(Integer code,Object data) {this.data = data;this.code = code;}public Result(Integer code, Object data, String msg) {this.data = data;this.code = code;this.msg = msg;}public Object getData() {return data;}
}

• BusinessException类

public class BusinessException extends RuntimeException{private Integer code;public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}public BusinessException(Integer code, String message) {super(message);this.code = code;}public BusinessException(Integer code, String message, Throwable cause) {super(message, cause);this.code = code;}}

• SystemException类

public class SystemException extends RuntimeException{private Integer code;public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}public SystemException(Integer code, String message) {super(message);this.code = code;}public SystemException(Integer code, String message, Throwable cause) {super(message, cause);this.code = code;}}

.对比基于Spring的ssm整合案例

（详情可以去关注作者的ssm专栏）

总结

欢迎各位留言交流以及批评指正，如果文章对您有帮助或者觉得作者写的还不错可以点一下关注，点赞，收藏支持一下。
（博客的参考源码可以在我主页的资源里找到，如果在学习的过程中有什么疑问欢迎大家在评论区向我提出）