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SSM整合

2025/3/29 18:38:31 来源：https://blog.csdn.net/qq_73240755/article/details/146514073  浏览:  次   关键词：SSM整合

 

1.1ssm

  1. 首先导入jar包

     <dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.13.1</version><scope>test</scope></dependency><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>3.5.10</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>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>
​

  2. 创建jdbc.properties文件

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

  3. 创建配置文件SpringConfig,SpringMvcConfig

    //springConfig
@Configuration
@ComponentScan({"com.scidag.service","com.scidag.controller"})
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class,MybatisConfig.class})
@EnableTransactionManagement
public class SpringConfig {
}
​
//SpringMvcConfig
@Configuration
@ComponentScan("com.scidag.controller")
@EnableWebMvc
public class SpringMvcConfig {
​
}
​

  4. 创建JdbcConfig,MybatisConfig

    //JdbcConfig
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;
​@Beanpublic DataSource dataSource(){DruidDataSource dataSource=new DruidDataSource();dataSource.setDriverClassName(driver);dataSource.setUrl(url);dataSource.setUsername(username);dataSource.setPassword(password);return  dataSource;}@Beanpublic PlatformTransactionManager transactionManager(DataSource dataSource){//设置spring事务DataSourceTransactionManager dataSourceTransactionManager=new DataSourceTransactionManager();dataSourceTransactionManager.setDataSource(dataSource);return  dataSourceTransactionManager;}
}
    //MybatisConfig
public class MybatisConfig {@Beanpublic SqlSessionFactoryBean sqlSessionFactoryBean( DataSource dataSource){SqlSessionFactoryBean sqlSessionFactoryBean=new SqlSessionFactoryBean();sqlSessionFactoryBean.setTypeAliasesPackage("com.scidag.pojo");sqlSessionFactoryBean.setDataSource(dataSource);return  sqlSessionFactoryBean;}@Beanpublic MapperScannerConfigurer mapperScannerConfigurer(){MapperScannerConfigurer mapperScannerConfigurer=new MapperScannerConfigurer();mapperScannerConfigurer.setBasePackage("com.scidag.dao");return mapperScannerConfigurer;}
}
​

  5. 创建ServletConfig

    public class ServletConfig extends AbstractAnnotationConfigDispatcherServletInitializer {@Overrideprotected Class<?>[] getRootConfigClasses() {return new Class[]{SpringConfig.class};}
​@Overrideprotected Class<?>[] getServletConfigClasses() {return new Class[]{SpringMvcConfig.class};}
​@Overrideprotected String[] getServletMappings() {return new String[]{"/"};}
}
​

  6. 创建Dao和Service

    public interface BookDao {@Insert("insert into tbl_book (name,type,description)  values(#{name}, #{type}, #{description})")void save(Book book);@Delete("delete from tbl_book where id=#{id}")void delete(Integer id);@Update("update tbl_book set type=#{type}, name=#{name}, description=#{description} where id=#{id}")void update(Book book);@Select("select * from tbl_book where id =#{id}")Book  selectByID(Integer id);@Select("select * from tbl_book")List<Book> selectAll();
}
​
​
​
    public interface BookService {
​/*** 保存* @param book* @return*/boolean save(Book book);
​/*** 删除* @param id* @return*/boolean delete(Integer id);
​/*** 修改* @param book* @return*/boolean update(Book book);
​/*** 查单个* @param id* @return*/Book  selectByID(Integer id);
​/*** 查所有* @return*/List<Book> selectAll();
}
​
    @Service
public class BookServiceImpl implements BookService {@Autowiredprivate BookDao bookDao;@Overridepublic boolean save(Book book) {bookDao.save(book);return true;}
​@Overridepublic boolean delete(Integer id) {bookDao.delete(id);return true;}
​@Overridepublic boolean update(Book book) {bookDao.update(book);return true;}
​@Overridepublic Book selectByID(Integer id) {
​return   bookDao.selectByID(id);}
​@Overridepublic List<Book> selectAll() {return bookDao.selectAll();}
}

  7. 创建pojo

    对应数据库中的属性名和类型，提供对应的get set toString 方法即可

  8. 创建controller

    ​
@RestController
@RequestMapping("/books")
public class BookController {@Autowiredprivate BookService bookService;
​@PostMappingpublic boolean save(@RequestBody Book book){return bookService.save(book);}@PutMappingpublic boolean update(@RequestBody Book book){return  bookService.update(book);}@DeleteMapping("/{id}")public boolean delete(Integer id){return bookService.delete(id);}@GetMapping("/{id}")public Book selectByID(Integer id){return bookService.selectByID(id);
​}@GetMappingpublic List<Book> selectAll(){return  bookService.selectAll();}
}
​
1.2统一结果封装

对于3.1来说，返回结果的boolean类型数据，而select则返回的一个对象

为了返回一个统一的数据结果，前端解析更简单.

  • 设置一个统一返回结果类

Result class... {

private Object data; private Integer code; private String msg;

}

  • 定义返回码状态类

//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;
}

  • colltroller中使用

@PostMappingpublic Result save(@RequestBody Book book){boolean save = bookService.save(book);return new Result(save? Code.insert_success:Code.insert_err,save) ;}
1.3统一异常处理

异常种类和异常原因

框架内部抛出的异常：因使用不合规导致 数据层抛出的异常：因外部服务器故障导致（例如：服务器访问超时） 业务层抛出的异常：因业务逻辑书写错误导致（例如：遍历业务书写操作，导致索引异常等） 表现层抛出的异常：因数据收集、校验等规则导致（例如：不匹配的数据类型间导致异常） 工具类抛出的异常：因工具类书写不严谨不够健壮导致（例如：必要释放的连接长期未释放等）

处理方式：新建一个异常包，新建异常类

package com.scidag.Exception;
​
public class BusinessException extends RuntimeException{private  Integer code;
​public BusinessException() {}
​public BusinessException(Integer code) {this.code = code;}
​public BusinessException(String message, Integer code) {super(message);this.code = code;}
​public BusinessException(String message, Throwable cause, Integer code) {super(message, cause);this.code = code;}
​public BusinessException(Throwable cause, Integer code) {super(cause);this.code = code;}
​public BusinessException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace, Integer code) {super(message, cause, enableSuppression, writableStackTrace);this.code = code;}
​public Integer getCode() {return code;}
​public void setCode(Integer code) {this.code = code;}
}
​
​
​
​
--------------------------------------------------
package com.scidag.Exception;
​
public class SystemExcrption extends  RuntimeException{private Integer code;
​public SystemExcrption(Integer code) {this.code = code;}
​public SystemExcrption() {}
​public SystemExcrption(String message, Integer code) {super(message);this.code = code;}
​public SystemExcrption(String message, Throwable cause, Integer code) {super(message, cause);this.code = code;}
​public SystemExcrption(Throwable cause, Integer code) {super(cause);this.code = code;}
​public SystemExcrption(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace, Integer code) {super(message, cause, enableSuppression, writableStackTrace);this.code = code;}
​public Integer getCode() {return code;}
​public void setCode(Integer code) {this.code = code;}
}
---------------------------
controller
package com.scidag.controller;
​
import com.scidag.Exception.BusinessException;
import com.scidag.Exception.SystemExcrption;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
​
@RestControllerAdvice
public class ProjectExcptionAdvice {@ExceptionHandler(SystemExcrption.class)public Result doSystemExcrption(SystemExcrption e){
​return  new Result(e.getCode(),null ,e.getMessage());}@ExceptionHandler(BusinessException.class)public Result doBusinessExcrption(BusinessException e){
​return  new Result(e.getCode(),null ,e.getMessage());}@ExceptionHandler(Exception.class)public Result doExcrption(Exception e){System.out.println("有异常");return  new Result(Code.SYSTEM_UNKNOW_ERR,null ,"处理异常");}
}
​

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