虽然Spring Boot默认的配置很多情况都可以满足我们的项目需求,可是有的时候我们可能还是会需要更加灵活的SpringMVC配置,这个时候我们只需要自定义类继承自WebMvcConfigurerAdapter,然后使用@Configuration和@EnableWebMvc注解,这样我们会完全屏蔽掉Spring Boot的默认配置,但是正常情况下我们可能只是希望在Spring Boot已有默认配置的基础上再添加一些配置即Spring Boot提供的默认配置和我自定义的配置并存的情况,这个也简单,只需要去掉@EnableWebMvc注解就行了。如下代码:
如何自定义servlet listener ?
1 可以把servlet 或者listener 注册成configuration 里的一个bean.
@Bean
public XxServlet xxServlet(){
return new XxServlet();
}
listener 和filter 类似。
2 可以定义成一个componenet
- @Component("myServlet")
- public class MyServlet implements Servlet{
- /**
- *
- * @see javax.servlet.Servlet#destroy()
- */
- @Override
- public void destroy() {
- System.out.println("destroy...");
- }
- /**
- * @return
- * @see javax.servlet.Servlet#getServletConfig()
- */
- @Override
- public ServletConfig getServletConfig() {
- return null;
- }
- /**
- * @return
- * @see javax.servlet.Servlet#getServletInfo()
- */
- @Override
- public String getServletInfo() {
- return null;
- }
- /**
- * @param arg0
- * @throws ServletException
- * @see javax.servlet.Servlet#init(javax.servlet.ServletConfig)
- */
- @Override
- public void init(ServletConfig arg0) throws ServletException {
- System.out.println("servlet init...");
- }
- /**
- * @param arg0
- * @param arg1
- * @throws ServletException
- * @throws IOException
- * @see javax.servlet.Servlet#service(javax.servlet.ServletRequest, javax.servlet.ServletResponse)
- */
- @Override
- public void service(ServletRequest arg0, ServletResponse arg1) throws ServletException,
- IOException {
- System.out.println("service...");
- }
- @Component("myFilter")
- public class MyFilter implements Filter{
- /**
- *
- * @see javax.servlet.Filter#destroy()
- */
- @Override
- public void destroy() {
- System.out.println("destroy...");
- }
- /**
- * @param arg0
- * @param arg1
- * @param arg2
- * @throws IOException
- * @throws ServletException
- * @see javax.servlet.Filter#doFilter(javax.servlet.ServletRequest, javax.servlet.ServletResponse, javax.servlet.FilterChain)
- */
- @Override
- public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
- throws IOException,
- ServletException {
- System.out.println("doFilter...");
- arg2.doFilter(arg0, arg1);
- }
- /**
- * @param arg0
- * @throws ServletException
- * @see javax.servlet.Filter#init(javax.servlet.FilterConfig)
- */
- @Override
- public void init(FilterConfig arg0) throws ServletException {
- System.out.println("filter init...");
- }
- }<span style="font-family: Arial, Helvetica, FreeSans, sans-serif; font-size: 13.3333330154419px; line-height: 17.3333339691162px; background-color: transparent;"> </span>
- @Component("myListener")
- public class MyListener implements ServletContextListener{
- /**
- * @param arg0
- * @see javax.servlet.ServletContextListener#contextDestroyed(javax.servlet.ServletContextEvent)
- */
- @Override
- public void contextDestroyed(ServletContextEvent arg0) {
- System.out.println("contextDestroyed...");
- }
- /**
- * @param arg0
- * @see javax.servlet.ServletContextListener#contextInitialized(javax.servlet.ServletContextEvent)
- */
- @Override
- public void contextInitialized(ServletContextEvent arg0) {
- System.out.println("listener contextInitialized...");
- }
- }
3 如果觉得控制力度不够灵活(例如你想修改filter的映射),spring boot还提供了 ServletRegistrationBean,FilterRegistrationBean,ServletListenerRegistrationBean这3个东西来进行配置
- @Configuration
- public class WebConfig {
- @Bean
- public FilterRegistrationBean filterRegistrationBean(MyFilter myFilter){
- FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
- filterRegistrationBean.setFilter(myFilter);
- filterRegistrationBean.setEnabled(true);
- filterRegistrationBean.addUrlPatterns("/bb");
- return filterRegistrationBean;
- }
- }
servlet 容器配置?
可以通过两种方式配置servlet容器,一种是通过properties文件,例如:
完整的配置信息可以看这 http://github.com/spring-projects/spring-boot/tree/master/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java
另一种方式是Java代码的形式: