修改 utf ride listener web.xml map tor != ron

SpringBoot默認使用Tomcat作為嵌入式的Servlet容器

1）、如何定制和修改Servlet容器的相關配置

1、修改和server有關的配置 （ServerProperties【也是EmbeddedServletContainerCustomizer】）

server.port=8088
server.servlet.context-path=/crud

//通用的Servlet容器設置
server.xxx

//Tomcat的設置
server.tomcat.xxx
server.tomcat.uri-encoding=UTF-8

2、編寫一個EmbeddedServletContainerCustomizer： 嵌入式的Servlet容器的定制器；來修改Servlet容器的配置 在Spring Boot2.0以上配置嵌入式Servlet容器時 EmbeddedServletContainerCustomizer類不存在， 經網絡查詢發現被WebServerFactoryCustomizer

替代

@Configuration
public class config  {
    @Bean
    public WebServerFactoryCustomizer webServerFactoryCustomizer(){
        return new WebServerFactoryCustomizer<ConfigurableServletWebServerFactory >() {
            
            //定制嵌入式的Servlet容器相關的規則
            @Override
            public
 
 void customize(ConfigurableServletWebServerFactory factory) {
                factory.setPort(8087);
            }
        };
    }
}

2）、註冊Servlet、Filter、Listener

由於SpringBoot默認是以jar包的方式啟動嵌入式的Servlet容器來啟動 SpringBoot的web應用，沒有web.xml文件 使用一下三個類： ServletRegistrationBean FilterRegistrationBean ServletListenerRegistrationBean

註冊Servlet Servlet實現類：

public class MyServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       resp.getWriter().write("hello");
    }
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       doPost(req,resp);
    }
}

ServletRegistrationBean實現Servl加入容器

@Configuration
public class MyServletConfig {
    //註冊三大組件
    @Bean
    public ServletRegistrationBean servletRegistrationBean(){
        // public ServletRegistrationBean(T servlet, String... urlMappings)
        ServletRegistrationBean re = new ServletRegistrationBean(new MyServlet(),"/myServlet");
        return  re;
    }
}

/myServlet、是攔截瀏覽器的請求

註冊Filter

public class MyFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println("MyFilter...");
        filterChain.doFilter(servletRequest,servletResponse);
    }
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
    @Override
    public void destroy() {
    }
}

將Filter添加到容器

@Configuration
public class MyServletConfig {
    //註冊Filter
    @Bean
    public FilterRegistrationBean filterRegistrationBean(){
      //  public FilterRegistrationBean(T filter, ServletRegistrationBean... servletRegistrationBeans)
        FilterRegistrationBean f = new FilterRegistrationBean();
        f.setFilter(new MyFilter());
        f.setUrlPatterns(Arrays.asList("/myfilter","/test"));
        return f;
    }
}

Listener：

public class MyListener implements ServletContextListener {
    //監聽當前web項目銷毀
    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        System.out.println("web  end....");
    }
    //啟動監聽
    @Override
    public void contextInitialized(ServletContextEvent sce) {

        System.out.println("web  start...");
    }
}

加入容器　　

@Configuration
public class MyServletConfig {
    //註冊Listener
    @Bean
    public ServletListenerRegistrationBean servletListenerRegistrationBean(){
        ServletListenerRegistrationBean<MyListener> L = new 
            ServletListenerRegistrationBean<MyListener>(new MyListener());
        return L;
    }
}

同時可以設置的參數很多如load-starton......

SpringBoot幫我們自動SpringMVC的時候，自動的註冊SpringMVC的前端控制器； DIspatcherServlet；DispatcherServletAutoConfiguration中：

@Bean(
    name = {"dispatcherServletRegistration"}
)
@ConditionalOnBean(
    value = {DispatcherServlet.class},
    name = {"dispatcherServlet"}
)
public DispatcherServletRegistrationBean dispatcherServletRegistration(DispatcherServlet dispatcherServlet) {
    DispatcherServletRegistrationBean registration = new DispatcherServletRegistrationBean(dispatcherServlet, this.webMvcProperties.getServlet().getPath());
//默認攔截： / 所有請求；包靜態資源，但是不攔截jsp請求
//   /*會攔截jsp
//可以通過server.servletPath來修改SpringMVC前端控制器默認攔截的請求路徑

 registration.setName("dispatcherServlet");
    registration.setLoadOnStartup(this.webMvcProperties.getServlet().getLoadOnStartup());
    if (this.multipartConfig != null) {
        registration.setMultipartConfig(this.multipartConfig);
    }

    return registration;
}

getPath->WebMvcProperties -> private String path = "/";

17、配置嵌入式servlet容器（1）