1註冊三大元件

@Configuration
public class MyServerConfig {

    //註冊三大元件
    @Bean
    public ServletRegistrationBean myServlet(){
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(new MyServlet(),"/myServlet");
        registrationBean.setLoadOnStartup(1);
        return registrationBean;
    }

    @Bean
    public FilterRegistrationBean myFilter(){
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new MyFilter());
        registrationBean.setUrlPatterns(Arrays.asList("/hello","/myServlet"));
        return registrationBean;
    }

    @Bean
    public ServletListenerRegistrationBean myListener(){
        ServletListenerRegistrationBean<MyListener> registrationBean = new ServletListenerRegistrationBean<>(new MyListener());
        return registrationBean;
    }



}
 

public class MyFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        System.out.println("MyFilter doFilter");
        chain.doFilter(request,response);

    }

    @Override
    public void destroy() {

    }
}



public class MyListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        System.out.println("contextInitialized...web應用啟動");
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {

        System.out.println("contextDestroyed...當前web專案銷燬");
    }
}





public class MyServlet extends HttpServlet {

    //處理get請求
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("MyServlet  doGet");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("MyServlet  doPost");
    }
}
 

驗證

2容器配置規則

@Configuration
public class MyServerConfig {

    //註冊三大元件 .....

    //配置嵌入式的Servlet容器
    @Bean
    public EmbeddedServletContainerCustomizer embeddedServletContainerCustomizer(){
        return new EmbeddedServletContainerCustomizer() {

            //定製嵌入式的Servlet容器相關的規則,這裡是修改埠號
            @Override
            public void customize(ConfigurableEmbeddedServletContainer container) {
                container.setPort(8083);
            }
        };
    }

}

3切換容器

很簡單，只要去掉某些jar，在新增要切換的容器jar

Tomcat（預設使用）

引入web模組預設就是使用嵌入式的Tomcat作為Servlet容器；

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring‐boot‐starter‐web</artifactId>
</dependency>
 

切換

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring‐boot‐starter‐web</artifactId>
    <exclusions>
        <exclusion>//去掉tomcat容器
            <artifactId>spring‐boot‐starter‐tomcat</artifactId>
            <groupId>org.springframework.boot</groupId>
        </exclusion>
    </exclusions>
</dependency>

<!‐‐引入undertow容器‐‐>
<dependency>
    <artifactId>spring‐boot‐starter‐undertow</artifactId>
    <groupId>org.springframework.boot</groupId>
</dependency>