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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; @Bean public DataSource dataSource() { DruidDataSource dataSource = new DruidDataSource(); dataSource.setDriverClassName(driver); dataSource.setUrl(url); dataSource.setUsername(username); dataSource.setPassword(password); return dataSource; } @Bean public PlatformTransactionManager transactionManager(DataSource dataSource) { DataSourceTransactionManager ds = new DataSourceTransactionManager(); ds.setDataSource(dataSource); return ds; } } @Bean：定义第三方的插件bean类
MybatisConfig：
public class MybatisConfig { @Bean public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){ SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean(); factoryBean.setDataSource(dataSource); factoryBean.setTypeAliasesPackage("com.example.domain"); return factoryBean; } @Bean public MapperScannerConfigurer mapperScannerConfigurer(){ MapperScannerConfigurer msc = new MapperScannerConfigurer(); msc.setBasePackage("com.example.dao"); return msc; } }ServletConfig：
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[]{"/"}; } //设置post请求中文乱码过滤器 @Override protected Filter[] getServletFilters() { CharacterEncodingFilter filter = new CharacterEncodingFilter(); filter.setEncoding("utf-8"); return new Filter[]{filter}; } } SpringConfig：
@Configuration @ComponentScan("com.example.service") @PropertySource("classpath:jdbc.properties") @Import({JdbcConfig.class, MybatisConfig.class}) @EnableTransactionManagement public class SpringConfig { }@Configuration：标注为配置文件
@ComponentScan：标注要扫描的目录（Spring主要负责service层）
@PropertySource：加载数据库jdbc文件，classPath通过path加载
@Import：加载需要加载的Bean文件
@EnableTransactionManagement：允许启用事务回滚机制
SpringMvcConfig：
@Configuration @ComponentScan("com.example.controller") @EnableWebMvc public class SpringMvcConfig { }@EnableWebMvc：启用Spring-Mvc功能
resources\jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/数据库名 jdbc.username=账户名 jdbc.password=账户密码项目主要文件层级：
项目Test层级：
Test文件内容：
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(classes = SpringConfig.class) public class BookServiceTest { @Autowired private BookService bookService; @Test public void testGetById(){ Book book = bookService.getById(15); System.out.println(book); } @Test public void testGetAll(){ List<Book> all = bookService.getAll(); System.out.println(all); } }@Autowired：自动从spring中取出实体类
@Test：定义为测试类
Dao层：
主要用于数据层，书写sql语句
public interface BookDao { @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(); }Sql方法注解：@Insert、@Update、@Select、@Delete
domain层：
定义数据模态层
public class Book { private Integer id; private String type; private String name; private String description; //省略Getter和Setter... }Service服务层：
@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(); }@Transactional：定义该Service允许事务回滚
Service的实体类Impl：
@Service public class BookServiceImpl implements BookService { @Autowired private BookDao bookDao; public boolean save(Book book) { bookDao.save(book); return true; } }@Service：Service层的Impl必须声明为Service才会被Spring自动收集
异常处理类
@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(Exception.class) public void doException(Exception ex){ System.out.println("嘿嘿,异常你哪里跑！") } }@RestControllerAdvice：@ResponseBody风格的异常处理
@RestControllerAdvice=@ControllerAdvice+@ResponseBody
如异常处理为文件夹，须在SpringMvcConfig中配置ComponentScan
异常分类
分为三类：
1.业务异常(Business Excption)
数据遗漏、提示规范操作
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; } }2.系统异常(System Excption)
数据库、服务器宕机
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 msg, Throwable cause) { super(msg, cause); this.code = code; } }3.其他异常(Excption)
未预期到的异常
整合异常处理
@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 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 doException(Exception ex) { return new Result(Code.SYSTEM_UNKNOW_ERR, null, "系统繁忙，请稍后重试"); } } 拦截器开发
步骤1：创建ProjectInterceptor，重写HandlerInterceptor
@Component public class ProjectInterceptor implements HandlerInterceptor { @Override //原始方法调用前执行的内容 public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { System.out.println("preHandle..."); return true; } @Override //原始方法调用后执行的内容 public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { System.out.println("postHandle..."); } @Override //原始方法调用完成后执行的内容 public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { System.out.println("afterCompletion..."); } } 步骤2：修改SpringMvcConfig，具有一定侵入性
public class SpringMvcConfig implements WebMvcConfigurer { @Autowired private ProjectInterceptor projectInterceptor; @Override public void addInterceptors(InterceptorRegistry registry) { //配置多拦截器 registry.addInterceptor(projectInterceptor).addPathPatterns("/books", "/books/*"); } } 通过拦截器获取参数
request：请求体 response：响应体 handler：被调用的处理器对象
preHandle
获取header中内容：request.getHeader(头部key名)
handler：
HandlerMethod hm = (HandlerMethod) handler; String methodName = hm.getMethod().getName();postHandle
ModelAndView modelAndView：如果处理器执行完成具有返回结果，可以读取到对应数据与页面信息，并进行调整。因为都是返回json数据，所以该参数的使用率不高afterCompletion
配置多个拦截器
新增拦截器文件，在SpringMvcConfig中添加
@Configuration @ComponentScan({"com.example.controller", "com.example.exception"}) @EnableWebMvc public class SpringMvcConfig implements WebMvcConfigurer { @Autowired private ProjectInterceptor projectInterceptor; @Autowired private ProjectInterceptor2 projectInterceptor2; @Override public void addInterceptors(InterceptorRegistry registry) { //配置多拦截器 registry.addInterceptor(projectInterceptor).addPathPatterns("/books", "/books/*"); //新添加的拦截器 registry.addInterceptor(projectInterceptor2).addPathPatterns("/books", "/books/*"); } }