spring方式注入web原生组件

• spring方式注入servlet组件：普通类 + ServletRegistrationBean + @ServletComponentScan

# 编写普通类
public class MyServlet extends HttpServlet {
 
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("66666");
    }
}
 
# 新建配置类并标注为一个组件
@Configuration(proxyBeanMethods = true)
public class MyRegistConfig {   
 
    @Bean
    public ServletRegistrationBean myServlet(){
        MyServlet myServlet = new MyServlet();   # new一个普通类的对象，获取的是他的业务逻辑
        return new ServletRegistrationBean(myServlet,"/my","/my02");   # 参数为对象和请求路径
    }
 
}
 
# 扫描
@MapperScan("com.atguigu.admin.mapper")
@ServletComponentScan(basePackages = "com.atguigu.admin")
@SpringBootApplication(exclude = RedisAutoConfiguration.class)
public class Boot05WebAdminApplication {
    public static void main(String[] args) {
        SpringApplication.run(Boot05WebAdminApplication.class, args);
    }
}

• spring方式注入filter组件：普通类 + FilterRegistrationBean + @ServletComponentScan

# 方式1
# 编写普通类
public class MyServlet extends HttpServlet {
 
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("66666");
    }
}
 
# 新建配置类并标注为一个组件
@Configuration(proxyBeanMethods = true)
public class MyRegistConfig {   
 
    @Bean
    public ServletRegistrationBean myServlet(){
        MyServlet myServlet = new MyServlet();   # new一个普通类的对象，获取的是他的业务逻辑
        return new ServletRegistrationBean(myServlet,"/my","/my02");   # 参数为对象和请求路径
    }
 
    @Bean
    public FilterRegistrationBean myFilter(){
        MyFilter myFilter = new MyFilter();
        return new FilterRegistrationBean(myFilter,myServlet());      // 这里直接传入上面myServlet的路径，表示拦截该路径
        return filterRegistrationBean;
    }
 
}
 
# 扫描
@MapperScan("com.atguigu.admin.mapper")
@ServletComponentScan(basePackages = "com.atguigu.admin")
@SpringBootApplication(exclude = RedisAutoConfiguration.class)
public class Boot05WebAdminApplication {
    public static void main(String[] args) {
        SpringApplication.run(Boot05WebAdminApplication.class, args);
    }
}
 
 
# 方式2
# 新建配置类并标注为一个组件
@Configuration(proxyBeanMethods = true)
public class MyRegistConfig {   
 
    @Bean
    public FilterRegistrationBean myFilter(){
        MyFilter myFilter = new MyFilter();
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(myFilter);
        filterRegistrationBean.setUrlPatterns(Arrays.asList("/my","/css/*"));
        return filterRegistrationBean;
    }
 
}
 
# 扫描
@MapperScan("com.atguigu.admin.mapper")
@ServletComponentScan(basePackages = "com.atguigu.admin")
@SpringBootApplication(exclude = RedisAutoConfiguration.class)
public class Boot05WebAdminApplication {
    public static void main(String[] args) {
        SpringApplication.run(Boot05WebAdminApplication.class, args);
    }
}

• spring方式注入listener组件：ServletListenerRegistrationBean + @ServletComponentScan

# 新建配置类
@Configuration(proxyBeanMethods = true)
public class MyRegistConfig {   
 
    @Bean
    public ServletListenerRegistrationBean myListener(){
        MySwervletContextListener mySwervletContextListener = new MySwervletContextListener();
        return new ServletListenerRegistrationBean(mySwervletContextListener);
    }
 
}
 
# 扫描
@MapperScan("com.atguigu.admin.mapper")
@ServletComponentScan(basePackages = "com.atguigu.admin")
@SpringBootApplication(exclude = RedisAutoConfiguration.class)
public class Boot05WebAdminApplication {
    public static void main(String[] args) {
        SpringApplication.run(Boot05WebAdminApplication.class, args);
    }
}

• 配置类设置如下，保证依赖的组件始终是单实例的

@Configuration(proxyBeanMethods = true)