SpringMVC（四）：SSM整合

目录

一、SSM整合

1、整合配置

2、功能模块

3、接口测试

二、表现层数据封装

1、整合中响应数据问题

2、定义Result类封装响应结果

3、表现层数据封装返回Result对象

---

一、SSM整合

1、整合配置

（1）创建web工程，添加依赖和插件

    
        org.springframework
        spring-webmvc
        5.2.10.RELEASE
    

    
        org.springframework
        spring-jdbc
        5.2.10.RELEASE
    

    
        org.springframework
        spring-test
        5.2.10.RELEASE
    

    
        org.mybatis
        mybatis
        3.5.6
    

    
        org.mybatis
        mybatis-spring
        1.3.0
    

    
        mysql
        mysql-connector-java
        5.1.47
    

    
        com.alibaba
        druid
        1.1.16
    

    
        junit
        junit
        4.12
        test
    

    
        javax.servlet
        javax.servlet-api
        3.1.0
        provided
    

    
        com.fasterxml.jackson.core
        jackson-databind
        2.9.0
    



    
        
            org.apache.tomcat.maven
            tomcat7-maven-plugin
            2.1
            
                80
                /
            
        
    

（2）spring整合mybatis

创建数据库和表

-- 创建ssm_db数据库
CREATE DATABASE IF NOT EXISTS ssm_db CHARACTER SET utf8;

-- 使用ssm_db数据库
USE ssm_db;

-- 创建tbl_book表
CREATE TABLE tbl_book(
    id INT PRIMARY KEY AUTO_INCREMENT, -- 图书编号
    TYPE VARCHAR(100), -- 图书类型
    NAME VARCHAR(100), -- 图书名称
    description VARCHAR(100) -- 图书描述
);
-- 添加初始化数据
INSERT INTO tbl_book VALUES(NULL,'计算机理论','Spring实战 第5版','Spring入门经典教材，深入理解Spring原理技术内幕');
INSERT INTO tbl_book VALUES(NULL,'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(NULL,'计算机理论','Spring 5设计模式','深入Spring源码剖析,Spring源码蕴含的10大设计模式');
INSERT INTO tbl_book VALUES(NULL,'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(NULL,'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(NULL,'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+');

 jdbc.properties属性文件

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm_db
jdbc.username=root
jdbc.password=root

JdbcConfig配置类

public class JdbcConfig {
    @Value("${jdbc.driver}")
    private String driver;
    @Value("${jdbc.url}")
    private String url;
    @Value("${jdbc.username}")
    private String username;
    @Value("${jdbc.password}")
    private String password;
	//配置连接池
    @Bean
    public DataSource dataSource(){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driver);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        return dataSource;
    }
	//Spring事务管理需要的平台事务管理器对象
    @Bean
    public PlatformTransactionManager transactionManager(DataSource dataSource){
        DataSourceTransactionManager ds = new DataSourceTransactionManager();
        ds.setDataSource(dataSource);
        return ds;
    }
}

 MybatisConfig配置类

public class MyBatisConfig {
    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(dataSource);
        factoryBean.setTypeAliasesPackage("com.itheima.domain");
        return factoryBean;
    }

    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("com.itheima.dao");
        return msc;
    }
}

 SpringConfig配置类

@Configuration
@ComponentScan({"com.csdn.service"})
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MyBatisConfig.class})
@EnableTransactionManagement //开启Spring事务管理
public class SpringConfig {
}

（3）Spring整合SpringMVC

SpringMvcConfig配置类

@Configuration
@ComponentScan("com.csdn.controller")
@EnableWebMvc
public class SpringMvcConfig {
}

ServletConfig配置类，加载SpringMvcConfig和SpringConfig配置类

public class ServletConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
    protected Class[] getRootConfigClasses() {
        return new Class[]{SpringConfig.class};
    }

    protected Class[] getServletConfigClasses() {
        return new Class[]{SpringMvcConfig.class};
    }

    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

2、功能模块

（1）数据层(BookDao)

Book实体类

public class Book {
    private Integer id;
    private String type;
    private String name;
    private String description;
    //需要补充getter、setter、toString()方法
}

BookDao接口

public interface BookDao {

    //@Insert("insert into tbl_book values(null,#{type},#{name},#{description})")
    @Insert("insert into tbl_book (type,name,description) values(#{type},#{name},#{description})")
    public int save(Book book);  //返回值表示影响的行数

    @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 getAll();
}

（2）业务层开发(BookService/BookServiceImpl)

BookService接口

@Transactional //表示所有方法进行事务管理
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 getAll();
}

 BookServiceImpl实现类

@Service
public class BookServiceImpl implements BookService {
    @Autowired
    private BookDao bookDao;

    public boolean save(Book book) {
        bookDao.save(book);
        return true;
    }

    public boolean update(Book book) {
        bookDao.update(book);
        return true;
    }

    public boolean delete(Integer id) {
        bookDao.delete(id);
        return true;
    }

    public Book getById(Integer id) {
        return bookDao.getById(id);
    }

    public List getAll() {
        return bookDao.getAll();
    }
}

（3）表现层开发(BookController)

@RestController
@RequestMapping("/books")
public class BookController {

    @Autowired
    private BookService bookService;

    @PostMapping
    public boolean save(@RequestBody Book book) {
        return bookService.save(book);
    }

    @PutMapping
    public boolean update(@RequestBody Book book) {
        return bookService.update(book);
    }

    @DeleteMapping("/{id}")
    public boolean delete(@PathVariable Integer id) {
        return bookService.delete(id);
    }

    @GetMapping("/{id}")
    public Book getById(@PathVariable Integer id) {
        return bookService.getById(id);
    }

    @GetMapping
    public List getAll() {
        return bookService.getAll();
    }
}

3、接口测试

（1）Spring整合Junit测试业务层方法

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class BookServiceTest {

    @Autowired
    private BookService bookService;

    @Test
    public void testGetById(){
        Book book = bookService.getById(1);
        System.out.println(book);
    }

    @Test
    public void testGetAll(){
        List all = bookService.getAll();
        System.out.println(all);
    }
}

（2）测试

二、表现层数据封装

1、整合中响应数据问题

问题：表现层增删改方法返回true或者false表示是否成功，getById()方法返回一个json对象，getAll()方法返回一个json对象数组，这里就出现了三种格式的响应结果，极其不利于前端解析。

解决：我们需要统一响应结果的格式

2、定义Result类封装响应结果

（1）Result类封装响应结果

public class Result {
    //描述统一格式中的数据
    private Object data;
    //描述统一格式中的编码，用于区分操作，可以简化配置0或1表示成功失败
    private Integer code;
    //描述统一格式中的消息，可选属性
    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;
    }
     //需要补充getter、setter、toString()方法
}

（2）Code类封装响应码

//状态码
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;
}

3、表现层数据封装返回Result对象

@RestController
@RequestMapping("/books")
public class BookController {

    @Autowired
    private BookService bookService;

    @PostMapping
    public Result save(@RequestBody Book book) {
        boolean flag = bookService.save(book);
        return new Result(flag ? Code.SAVE_OK:Code.SAVE_ERR,flag);
    }

    @PutMapping
    public 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);
    }

    @GetMapping
    public Result getAll() {
        List 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);
    }
}