SSM整合_demo

整合流程

code：https://github.com/Albertzzd/ssm_demo_case

• 创建maven工程

• 创建文件目录结构：config、dao、domain、Service、controller

• Spring环境搭建

  • xml坐标导入-springmvc

    <?xml version="1.0" encoding="UTF-8"?>
    
        4.0.0
    
        org.example
        ssm_code
        1.0-SNAPSHOT
        war
    
        
        
            
            
                org.springframework
                spring-webmvc
                5.2.10.RELEASE
            
    
        
        
            8
            8
        
    
    
    

  • SpringConfig

    @Configuration
    @ComponentScan("com.itcase.service")
    public class SpringConfig {
    }
    

  • domain实体类

• Spring整合Mybatis：业务层和持久层

  • xml坐标导入

            
            
                org.mybatis
                mybatis-spring
                1.3.0
            
    
            
            
                org.springframework
                spring-jdbc
                5.2.10.RELEASE
            
    
            
            
                org.springframework
                spring-test
                5.2.10.RELEASE
            
    
            
            
                mysql
                mysql-connector-java
                5.1.47
            
    
            
            
                org.mybatis
                mybatis
                3.5.6
            
    
            
            
                com.alibaba
                druid
                1.2.1
            
    
            
            
                junit
                junit
                4.12
                test
            
    

  • jdbc配置

    jdbc.driver=com.mysql.jdbc.Driver
    jdbc.url=jdbc:mysql://127.0.0.1:3306/ssm_db?useSSL=false&characterEncoding=utf8
    jdbc.username=root
    jdbc.password=root
    

  • JdbcConfig配置：配置连接池、事务管理器

    //配置：连接池、事务管理器
    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;
    
        //设置连接池
        @Bean
        public DataSource dataSource(){
            DruidDataSource dataSource = new DruidDataSource();
            dataSource.setDriverClassName(driver);
            dataSource.setUrl(url);
            dataSource.setUsername(username);
            dataSource.setPassword(password);
            return dataSource;
        }
    
        //设置事务管理器 (声明式事务)
        @Bean
        public PlatformTransactionManager transactionManager(DataSource dataSource){
            //PlatformTransactionManager是DataSourceTransactionManager的父接口
            DataSourceTransactionManager dstm = new DataSourceTransactionManager();
            dstm.setDataSource(dataSource);
            return dstm;
        }
    }
    

  • MybatisConfig配置

    //Mybatis配置类
    public class MybatisConfig {
        @Bean
        public SqlSessionFactoryBean getSqlSessionFactoryBean(DataSource ds){
            SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
            //设置pojo的包扫描
            factoryBean.setTypeAliasesPackage("com.itcase.domain");
            //设置连接池
            factoryBean.setDataSource(ds);
            return factoryBean;
        }
    
        @Bean
        public MapperScannerConfigurer mapperScannerConfigurer(){
            MapperScannerConfigurer msc = new MapperScannerConfigurer();
            //设置dao层的接口扫描
            msc.setBasePackage("com.itcase.dao");
            return msc;
        }
    }
    

    更新SpringConfig配置类

    @Configuration//Spring配置类
    @ComponentScan("com.itcase.service")//扫描指定包下的类，并添加到Ioc容器
    @PropertySource("classpath:db.properties")//加载外部配置文件
    @Import({JdbcConfig.class,MybatisConfig.class})//引入配置类
    @EnableWebMvc//开启事物管理支持
    public class SpringConfig {
    }
    
    

  • dao层代码

  • service层代码：接口+实现类

    增加@Transactional事务声明

• SpringMVC整合：业务层和表现层

  • XML坐标导入：JSON、Servlet

            
            
                javax.servlet
                javax.servlet-api
                3.1.0
                provided
            
    
            
            
                com.fasterxml.jackson.core
                jackson-databind
                2.9.0
            
    

  • SpringMVC配置

    @Configuration
    @ComponentScan("com.itcase.controller")
    @EnableWebMvc //JSON自动转换
    public class SpringmvcConfig {
    }
    

  • Web容器配置

    public class ServletInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
        @Override
        protected Class<?>[] getRootConfigClasses() {
            //指定spring配置类加载(根配置)
            return new Class[]{SpringConfig.class};
        }
    
        @Override
        protected Class<?>[] getServletConfigClasses() {
            //指定springmvc配置类加载
            return new Class[]{SpringmvcConfig.class};
        }
    
        @Override
        protected String[] getServletMappings() {
            //配置springmvc拦截路径为 / (全路径)
            return new String[]{"/"};
        }
    
        //中文乱码过滤器
        @Override
        protected Filter[] getServletFilters() {
            CharacterEncodingFilter encodingFilter = new CharacterEncodingFilter();
            encodingFilter.setEncoding("utf-8");
            return new Filter[]{encodingFilter};
        }
    }
    

  • 编写Controller层代码

    @RestController
    @RequestMapping("/book")
    public class BookController {
        @Autowired
        private BookService bookService;
    
        @PostMapping
        public boolean save(@RequestBody Book book) {
            return bookService.saveBook(book);
        }
    
        @PutMapping
        public boolean update(@RequestBody Book book) {
            return bookService.updateBook(book);
        }
    
        @DeleteMapping("/{id}")
        public boolean delete(@PathVariable Integer id) {
            return bookService.deleteBookById(id);
        }
    
        @GetMapping("/{id}")
        public Book getById(@PathVariable Integer id) {
            return bookService.getBookById(id);
        }
    
        @GetMapping
        public List getAll() {
            return bookService.getAllBook();
        }
    }
    
    

  • Tomcat配置

• 联合postman测试

• 封装表现层数据

• SpringMVC异常处理器

  @RestControllerAdvice
  public class ProjectExceptionAdvice {
      //专门处理业务功能导致的异常
      @ExceptionHandler(BusinessException.class)
      public Result doBusinessException(BusinessException ex){
          //发送对应消息传递给用户，提醒规范操作
          return new Result(ex.getCode(),ex.getMessage());
      }
  
      //专门处理系统异常
      @ExceptionHandler(SystemException.class)
      public Result doSystemException(SystemException ex){
          //发送固定消息传递给用户，安抚用户
          //发送特定消息给运维人员，提醒维护
          //记录日志
          return new Result(ex.getCode(),ex.getMessage());
      }
  
      //处理其他未知异常
      @ExceptionHandler(Exception.class)
      public Result doException(Exception ex){
          //发送固定消息传递给用户，安抚用户
          //发送特定消息给编程人员，提醒维护
          //记录日志
          return new Result(Code.SYSTEM_UNKNOW_ERR,"服务器正在维护,请稍后访问");
      }
  }
  

• SpringMVC拦截器使用

  自定义拦截器(通知)

  配置拦截器拦截规则(切入点)

  修改SpringmvcConfig配置(新增扫描config包)

文件目录结构