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") public class SpringConfig { }
3.2:MyBatis配置类
3.2.1:Mybatis
public class MybatisConfig { @Bean public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){ SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean(); sqlSessionFactoryBean.setTypeAliasesPackage("com.ysj.Domain"); sqlSessionFactoryBean.setDataSource(dataSource); return sqlSessionFactoryBean; } @Bean public MapperScannerConfigurer mapperScannerConfigurer(){ MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer(); mapperScannerConfigurer.setBasePackage("com.ysj.Dao"); return mapperScannerConfigurer; } }
3.2.2:Jdbc配置类
public class JdbcConfig { // jdbc.driver=com.mysql.jdbc.Driver // jdbc.url=jdbc:mysql://localhost:3308/mybatis // jdbc.username=root // jdbc.password=yangshijie @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; } }
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") @EnableWebMvc public class SpringMvcConfig { }
- web配置类
//web配置类 public class ServletConfig extends AbstractAnnotationConfigDispatcherServletInitializer { protected Class<?>[] getRootConfigClasses() { return new Class[]{SpringConfig.class}; } protected Class<?>[] getServletConfigClasses() { return new Class[]{SpringMvcConfig.class}; } protected String[] getServletMappings() { return new String[]{"/"}; } }
5:Junit测试
@RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(classes = SpringConfig.class) //上下文配置类 public class BookServiceTest { @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); } }
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
@Bean public PlatformTransactionManager transactionManager(DataSource dataSource){ DataSourceTransactionManager ds = new DataSourceTransactionManager(); 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
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() { } public Result(Integer code,Object data) { this.data = data; this.code = code; } 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; } }
- 编写Code编码类(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; public static final Integer SYSTEM_ERR = 50001; public static final Integer SYSTEM_TIMEOUT_ERR = 50002; public static final Integer SYSTEM_UNKNOW_ERR = 59999; public static final Integer 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 @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 TestExcepition(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 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!"); } }
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 public class TestExcepition extends RuntimeException { private Integer code; //区别自定义异常类的编码 public TestExcepition(Integer code) { this.code = code; } public TestExcepition(String message, Integer code) { super(message); this.code = code; } public TestExcepition(String message, Throwable cause, Integer code) { super(message, cause); this.code = code; } public void setCode(Integer code) { this.code = code; } public Integer getCode() { 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 @Component public class TestProjectInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { //中间可以加上所需业务逻辑 return false;//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 @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { } //原始方法调用完成后执行的内容 @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { } }
- 将其加入SpringMvc控制中
- 方法:
- 新建一个类,继承
WebMvcConfigurationSupport
类
@Configuration public class SpringMvcSupport extends WebMvcConfigurationSupport { @Autowired private TestProjectInterceptor 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 @Override protected void addResourceHandlers(ResourceHandlerRegistry registry) { registry.addResourceHandler("pages/**").addResourceLocations("pages/"); } @Override protected void addInterceptors(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 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/*"); 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
@Override public void addInterceptors(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。**