springMVC11(SSM整合)

一、框架

二、整合流程：

三、创建一个Maven的Web的项目：

3.1-包目录的创建：

3.2-对各各包的解析：

config目录存放的是相关的配置类

controller编写的是Controller类

dao存放的是Dao接口，因为使用的是Mapper接口代理方式，所以没有实现类包

service存的是Service接口，impl存放的是Service实现类

resources:存入的是配置文件，如Jdbc.properties

webapp:目录可以存放静态资源

test/java:存放的是测试类

---

四、环境准备ssm的整合 --->（Config包下）：

4.1-pox.xml（这个"非常重要"，关系重大！！！）

<?xml version="1.0" encoding="UTF-8"?>

<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.itheima</groupId>
  <artifactId>springMvc_ssm</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>war</packaging>

//--------------------------------------
//你们复制下面的部分就可以了

  <dependencies>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>5.2.10.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.6</version>
    </dependency>

    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.0</version>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.47</version>
    </dependency>

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

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>

    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.0</version>
    </dependency>
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.tomcat.maven</groupId>
        <artifactId>tomcat7-maven-plugin</artifactId>
        <version>2.1</version>
        <configuration>
          <port>80</port>
          <path>/</path>
        </configuration>
      </plugin>
    </plugins>
  </build>
</project>

4.2-创建SpringConfig配置类

@Configuration
@ComponentScan("com.itheima.service")
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MyBatisConfig.class})
public class SpringConfig {
}

4.3-创建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;

    @Bean
    public DataSource dataSource(){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driver);
        dataSource.setUrl(url);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        return dataSource;
    }

    //平台事务管理器
    @Bean
    public PlatformTransactionManager transactionManager(DataSource dataSource){
        DataSourceTransactionManager ds = new DataSourceTransactionManager();
        ds.setDataSource(dataSource);
        return ds;
    }
}

4.4-创建MybatisConfig配置类

public class MyBatisConfig {
    //MyBatisConfig 配置类需要两个bean被IOC容器管理，SqlSessionFactoryBean可以自动获得SqlSessionFactory，MapperScannerConfigurer扫描mapper所在的包
    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(dataSource);
        factoryBean.setTypeAliasesPackage("com.itheima.domain");
        return factoryBean;
    }
    //Mapper扫描配置器MapperScannerConfigurer
    @Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("com.itheima.dao");
        return msc;
    }
}

4.5-创建SpringMvcConfig配置类

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

4.6-创建ServletConfig配置类

//web--springMVC的配置
public class ServletConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
    //加载Spring配置类
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{SpringConfig.class};
    }
    //加载SpringMVC配置类
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{SpringMvcConfig.class};
    }
    //设置SpringMVC请求地址拦截规则
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

4.7-创建jdbc.properties

在resources下提供jdbc.properties,设置数据库连接四要素

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

五、代码实现：

需求:对表tbl_book进行新增、修改、删除、根据ID查询和查询所有

5.1-创建数据库及表

5.1.....1-表的"tbl_book字段信息"(Design Table)

5.1......2-表信息(自己看心情写)

5.2-编写Book模型类(和"表"的字段对应)（domain包下）

public class Book {
    private Integer id;
    private String type;
    private String name;
    private String description;

    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", type='" + type + '\'' +
                ", name='" + name + '\'' +
                ", description='" + description + '\'' +
                '}';
    }
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }
}

5.3-编写Dao接口(是一个：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 void save(Book book);

        @Update("update tbl_book set type = #{type}, name = #{name}, description = #{description} where id = #{id}")
        public void update(Book book);

        @Delete("delete from tbl_book where id = #{id}")
        public void 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();
    }

5.4-编写Service接口和实现类

5.4.....1-Service接口:（BookService的内容）

//业务注解，搭配SpringConfig的@EnableTransactionManagement和JdbcConfig里的PlatformTransactionManager的bean对象
@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();
}

5.4.....2-Service实现类:（BookServiceImpl的内容）：#（和Dao层联系）

//BookService是接口，BookServiceImpl是实现类
@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<Book> getAll() {
        return bookDao.getAll();
    }
}

5.4......3-自动注入bookDao黄线提示问题：

5.5-编写Contorller类

@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<Book> getAll() {
        return bookService.getAll();
    }

}

六、Test单元测试：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class TestService {
    @Autowired
    private BookService bookService;

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

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

七、如何让一个Maven项目"跑"起来：

八、一些Maven的配置（要注意，不然会报错！！！）

八：PostMan测试：

8.1-添加数据POST：

{
    "type": "111",
    "name": "11111111f",
    "description": "1111111"
}

8.2-修改数据PUT：

{
    "id": 3,
    "type": "000000",
    "name": "0000000",
    "description": "0000000000"
}

8.3-删除数据DELETE：

8.4-按Id查询GET：

8.5:全部查询GET：

九、总结：

9.1-整合MyBatis

9.2-整合srpingMvc

9.2.....1：web配置

9.2....2：springMvc配置类

9.2.....3:controller配置

十、小结：

---------------------------------------------

十一、统一结果封装，前后端数据传输协议：

11.1-希望的效果：

11.2-包的位置

11.3:代码块：

• Result代码块：

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() {
    }

    //构造方法是方便对象的创建
    public Result(Integer code, Object data) {
        this.data = data;
        this.code = code;
    }

    //构造方法是方便对象的创建
    public Result(Integer code, Object data, String msg) {
        this.data = data;
        this.code = code;
        this.msg = msg;
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.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;
    }
}

• code代码块：

//返回状态码，1结尾是成功，0结尾是失败
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;
}

• Controller代码块：

//统一每一个控制器方法返回值
@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<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);
    }
}

----------------------------------------------------

十二、异常处理：

12.1-包路径：

12.2-异常处理的代码块：

//@RestControllerAdvice用于标识当前类为REST风格对应的异常处理器，Advise译为通知，建议
@RestControllerAdvice
public class ProjectExceptionAdvice {
    //除了自定义的异常处理器，保留对Exception类型的异常处理，用于处理非预期的异常
    //@ExceptionHandler异常处理器
    @ExceptionHandler(Exception.class)
    public Result doException(Exception ex){
        System.out.println("嘿嘿,异常你哪里跑！");
        return new Result(666,null,"嘿嘿,异常你哪里跑！");
    }
}

------------------------------------------------

十三、项目异常处理（对上面"十二"异常处理的升级）

上面"十二"的是对"异常"统一回复，现在是分"运行时异常"，"输出时异常"等来做多方面处理。

• 包的结构

• ProjectExceptionAdvice的代码块

//@RestControllerAdvice用于标识当前类为REST风格对应的异常处理器
@RestControllerAdvice
public class ProjectExceptionAdvice {
    //@ExceptionHandler用于设置当前处理器类对应的异常类型
    @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());
    }

    //除了自定义的异常处理器，保留对Exception类型的异常处理，用于处理非预期的异常
    @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！");
    }
}

• BusinessException代码块：

//自定义业务异常处理器，用于封装异常信息，对异常进行分类
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代码块：

//自定义系统异常处理器，继承运行时异常RuntimeException，用于封装异常信息，对异常进行分类
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;
    }

}

问：怎么使用"项目异常处理"？？？

答：在自己决定可能会出现错误的地方"抛出"异常处理器

具体操作：（根据实际案例，进行抛出异常）

• 思路解析：