SSM整合
步骤
创建工程
SSM整合
-Spring
-SpringConfig
-MyBatis
-MybatisConfig
-JdbcConfig
-jdbc.properties
-SpringMVC
-ServletConfig
-SpringMvcConfig``````3.功能模块
-表和实体类
-Dao(接口+自动代理)
-service(接口+测试类)
-业务层接口(整合Junit)
-Controller
-表现层接口测试(PostMan)
一:导入相关依赖
<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>
二:创建相应包和类
三:编写相应配置类
3.1:Spring配置类
@Configuration@Import({JdbcConfig.class,MybatisConfig.class})@ComponentScan("com.ysj.service")@PropertySource("classpath:jdbc.properties")publicclassSpringConfig{}
3.2:MyBatis配置类
3.2.1:Mybatis
publicclassMybatisConfig{@BeanpublicSqlSessionFactoryBeansqlSessionFactoryBean(DataSource dataSource){SqlSessionFactoryBean sqlSessionFactoryBean =newSqlSessionFactoryBean();
sqlSessionFactoryBean.setTypeAliasesPackage("com.ysj.Domain");
sqlSessionFactoryBean.setDataSource(dataSource);return sqlSessionFactoryBean;}@BeanpublicMapperScannerConfigurermapperScannerConfigurer(){MapperScannerConfigurer mapperScannerConfigurer =newMapperScannerConfigurer();
mapperScannerConfigurer.setBasePackage("com.ysj.Dao");return mapperScannerConfigurer;}}
3.2.2:Jdbc配置类
publicclassJdbcConfig{// jdbc.driver=com.mysql.jdbc.Driver// jdbc.url=jdbc:mysql://localhost:3308/mybatis// jdbc.username=root// jdbc.password=yangshijie@Value("${jdbc.driver}")privateString driver;@Value("${jdbc.url}")privateString url;@Value("${jdbc.username}")privateString username;@Value("${jdbc.password}")privateString password;@BeanpublicDataSourcedataSource(){DruidDataSource dataSource =newDruidDataSource();
dataSource.setDriverClassName(driver);
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);return dataSource;}}
3.2.3:Jdbc.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=root
4:SpringMVC配置类
- 控制表现层(这个配置类如果导入SpringConfig中,SpringMVC控制的bean也会被Spring控制)
@Configuration@ComponentScan("com.ysj.Controller")@EnableWebMvcpublicclassSpringMvcConfig{}
- web配置类
//web配置类publicclassServletConfigextendsAbstractAnnotationConfigDispatcherServletInitializer{protectedClass<?>[]getRootConfigClasses(){returnnewClass[]{SpringConfig.class};}protectedClass<?>[]getServletConfigClasses(){returnnewClass[]{SpringMvcConfig.class};}protectedString[]getServletMappings(){returnnewString[]{"/"};}}
5:Junit测试
@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(classes =SpringConfig.class)//上下文配置类publicclassBookServiceTest{@AutowiredprivateBookService bookService;@TestpublicvoidtestGetById(){Book book = bookService.getById(1);System.out.println(book);}@TestpublicvoidtestGetAll(){List<Book> all = bookService.getAll();System.out.println(all);}}
6:事务管理器
6.1:注册驱动
- 在Spring配置类中注册事务管理驱动
@EnableTransactionManagement
6.2:配置平台事务管理容器
- 可在Jdbc配置类中直接配置
@BeanpublicPlatformTransactionManagertransactionManager(DataSource dataSource){DataSourceTransactionManager ds =newDataSourceTransactionManager();
ds.setDataSource(dataSource);//别用方法调用,否则就变成了java语言管理,而不是Speing容器管理了return ds;}
6.3:加事务
- 直接在service接口类上加@Transactional
- 后续有更多需求再加(事务传播行为等)
@Transactional
7:前后端传输协议
7.1:后端返回值
新建一个Result类充当返回值类
需要跟多属性和构造器可以再自行添加
publicclassResult{//描述统一格式中的数据privateObject 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privateInteger code;//描述统一格式中的消息,可选属性privateString msg;publicResult(){}publicResult(Integer code,Object data){this.data = data;this.code = code;}publicResult(Integer code,Object data,String msg){this.data = data;this.code = code;this.msg = msg;}publicObjectgetData(){return data;}publicvoidsetData(Object data){this.data = data;}publicIntegergetCode(){return code;}publicvoidsetCode(Integer code){this.code = code;}publicStringgetMsg(){return msg;}publicvoidsetMsg(String msg){this.msg = msg;}}
- 编写Code编码类(状态码)
publicclassCode{publicstaticfinalInteger SAVE_OK =20011;publicstaticfinalInteger DELETE_OK =20021;publicstaticfinalInteger UPDATE_OK =20031;publicstaticfinalInteger GET_OK =20041;publicstaticfinalInteger SAVE_ERR =20010;publicstaticfinalInteger DELETE_ERR =20020;publicstaticfinalInteger UPDATE_ERR =20030;publicstaticfinalInteger GET_ERR =20040;publicstaticfinalInteger SYSTEM_ERR =50001;publicstaticfinalInteger SYSTEM_TIMEOUT_ERR =50002;publicstaticfinalInteger SYSTEM_UNKNOW_ERR =59999;publicstaticfinalInteger BUSINESS_ERR =60002;}
8:自定义异常处理器
- 新建一个excepition包
- 包下创建所需各个异常类
8.1:总的异常处理器
//@RestControllerAdvice用于标识当前类为REST风格对应的异常处理器@RestControllerAdvicepublicclassProjectExceptionAdvice{//@ExceptionHandler用于设置当前处理器类对应的异常类型@ExceptionHandler(SystemException.class)publicResultTestExcepition(TestExcepition 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returnnewResult(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)publicResultdoOtherException(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returnnewResult(Code.SYSTEM_UNKNOW_ERR,null,"系统繁忙,请稍后再试!");}}
8.2:自定义分类的异常处理器类
- 记得继承相应的异常父类, - 原因:程序运行时遇到相应异常后可以不处理向上抛- 不继承坏处:以后每个方法都要加上这个类
//继承RuntimeException类publicclassTestExcepitionextendsRuntimeException{privateInteger code;//区别自定义异常类的编码publicTestExcepition(Integer code){this.code = code;}publicTestExcepition(String message,Integer code){super(message);this.code = code;}publicTestExcepition(String message,Throwable cause,Integer code){super(message, cause);this.code = code;}publicvoidsetCode(Integer code){this.code = code;}publicIntegergetCode(){return code;}}
9:拦截器
9.1:拦截器概念
- 拦截器是是一种动态拦截方法调用的机制,在SpringMVC中动态拦截控制器方法的执行(执行的时候类似栈思想)
- 作用 - 在指定的方法执行前后调用我们预先设定的代码- 阻止原始方法的执行(权限)
9.2:拦截器和过滤器的区别
9.2.1 精简版
- 过滤器是Servlet技术,其可以对几乎所有的请求进行增强
- 拦截器是SpringMVC技术,仅仅对SpringMVC技术进行增强
9.2.2 详细版
以下信息来源于html中文网
9.3:拦截器入门
- 拦截器在表现层生效,所以建议在controller包下新建Interceptor包
- 在该包下新建所需拦截器类(类继承
HandlerInterceptor
接口)
//继承HandlerInterceptor接口//注意当前类必须受Spring容器控制@ComponentpublicclassTestProjectInterceptorimplementsHandlerInterceptor{@OverridepublicbooleanpreHandle(HttpServletRequest request,HttpServletResponse response,Object handler)throwsException{//中间可以加上所需业务逻辑returnfalse;//这个返回值决定了后续的原生方法等是否会执行}//原始方法调用后执行的内容@OverridepublicvoidpostHandle(HttpServletRequest request,HttpServletResponse response,Object handler,ModelAndView modelAndView)throwsException{}//原始方法调用完成后执行的内容@OverridepublicvoidafterCompletion(HttpServletRequest request,HttpServletResponse response,Object handler,Exception ex)throwsException{}}
- 将其加入SpringMvc控制中
- 方法:- 新建一个类,继承
WebMvcConfigurationSupport
类@ConfigurationpublicclassSpringMvcSupportextendsWebMvcConfigurationSupport{@AutowiredprivateTestProjectInterceptor testProjectInterceptor;// * 匹配单个字符,如 /user/* 匹配的是 /user/aa,/user/bb 等,又如 /user/*/ab 匹配到 /user/p/ab;// ** 匹配任意多字符(包括多级路径),如:/user/** 匹配到 /user/aa、/user/p/bb 等;//配置相应的静态资源放行@OverrideprotectedvoidaddResourceHandlers(ResourceHandlerRegistry registry){ registry.addResourceHandler("pages/**").addResourceLocations("pages/");}@OverrideprotectedvoidaddInterceptors(InterceptorRegistry registry){ registry.addInterceptor(testProjectInterceptor).addPathPatterns("books/","books/*");}}
- 直接在SpringMvc配置类中进行- 让SpringMvc配置类继承WebMvcConfigurer
接口@Configuration@ComponentScan({"com.ysj.controller"})@EnableWebMvc//实现WebMvcConfigurer接口可以简化开发,但具有一定的侵入性publicclassSpringMvcConfigimplementsWebMvcConfigurer{@AutowiredprivateProjectInterceptor projectInterceptor;@AutowiredprivateProjectInterceptor2 projectInterceptor2;@OverridepublicvoidaddInterceptors(InterceptorRegistry registry){//配置多拦截器 registry.addInterceptor(projectInterceptor).addPathPatterns("/books","/books/*"); registry.addInterceptor(projectInterceptor2).addPathPatterns("/books","/books/*");}}
9.4🎃拦截器参数
- request:请求对象
- response:响应对象
- handler:一个被调用的处理器对象,其本质上是一个方法对象(HandlerMethod),对反射技术中的 Method进行的再包装。
- ModelAndView:若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
- Exception:获取程序运行过程中的异常对象(可通过SpringMvc自定义的异常处理器完美代替)
9.5🛋拦截器链
- 创建所需的多个拦截器类
- 配置多拦截器
@OverridepublicvoidaddInterceptors(InterceptorRegistry registry){//配置多拦截器 registry.addInterceptor(projectInterceptor).addPathPatterns("/books","/books/*"); registry.addInterceptor(projectInterceptor2).addPathPatterns("/books","/books/*");}}
- 多拦截器执行顺序- 按添加顺序运行- 若其中一个拦截器触发拦截条件,返回值为false,则直接跳到afterCompletion方法处,然后(出栈思想)
** 好了。SSM整合包含的知识点和步骤到这里已经总结完了,如有不足请指正,欢迎各位来一起交流讨论。
最后,创作不易,给个三连支持下呗。**
本文转载自: https://blog.csdn.net/qq_54217349/article/details/127164644
版权归原作者 踏风彡 所有, 如有侵权,请联系我们删除。
版权归原作者 踏风彡 所有, 如有侵权,请联系我们删除。