springboot中添加servlet, filter, listener有2种方式: 代码注册servlet 和自动注解注册(在使用druid监控有使用过)
代码注册通过ServletRegistrationBean、 FilterRegistrationBean 和 ServletListenerRegistrationBean 获得控制。 也可以通过servletContextInitializer接口直接注册
在 SpringBootApplication 上使用@ServletComponentScan注解后，Servlet、Filter、Listener 可以直接通过 @WebServlet、@WebFilter、@WebListener 注解自动注册，无需其他代码。
编写测试类:
Servlet:
1), 使用代码注册的方式
package com.iwhere.test.web.servlet; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * 通过代码注册servlet * 代码注册通过ServletRegistrationBean、 FilterRegistrationBean 和 ServletListenerRegistrationBean 获得控制。 也可以通过实现 ServletContextInitializer 接口直接注册。 * @author wenbronk * @time 2017年3月17日 下午2:23:21 2017 */ public class MyServlet extends HttpServlet { private static final long serialVersionUID = 6272693061640286219L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // super.doGet(req, resp); System.out.println("method deGet is run"); doPost(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // super.doPost(req, resp); System.out.println("method doPost is run"); resp.setContentType("text/html"); PrintWriter out = resp.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>Hello World</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>这是：MyServlet1</h1>"); out.println("</body>"); out.println("</html>"); } }
然后在 App.java (或者任意一类中, 该类必须@component被spring管理)
/** * 使用代码注册Servlet * 此方法不需要加注解 @ServletComponentScan * @return */ @Bean public ServletRegistrationBean myServlet() { return new ServletRegistrationBean(new MyServlet(),"/myServlet/*"); }
2), 使用注解的方式实现:
package com.iwhere.test.web.servlet; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * 使用注解的方式注册servlet * * @author wenbronk * @time 2017年3月17日 下午4:10:33 2017 */ @WebServlet(urlPatterns = "/myServlet2/*", description = "Servlet注解方式") public class AnnotionServlet extends HttpServlet { private static final long serialVersionUID = 1121465382990088487L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // super.doGet(req, resp); System.err.println("do Get"); doPost(req, resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { // super.doPost(req, resp); System.err.println("do post"); resp.setContentType("text/html"); PrintWriter out = resp.getWriter(); out.println("<html>"); out.println("<head>"); out.println("<title>Hello World</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>这是：myServlet2</h1>"); out.println("</body>"); out.println("</html>"); } }
测试: 可通过http://localhost:8080/springboot-learn/myServlet进行访问: (有加context配置)
Filter的配置:
此处只讲注解方式, 代码方式和servlet一样
package com.iwhere.test.web.filter; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.annotation.WebFilter; /** * 使用注解的方式创建filter, 实现一个filter接口 * 必须加注解@ServletComponentScan * @author wenbronk * @time 2017年3月17日 下午4:48:19 2017 */ @WebFilter(filterName="myFilter", urlPatterns="/*") public class MyFilter implements Filter { @Override public void destroy() { System.out.println("filter is destroy"); } @Override public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException { System.out.println("running filter"); arg2.doFilter(arg0, arg1); } @Override public void init(FilterConfig arg0) throws ServletException { System.out.println("filter is init"); } }
之后必须在main类上添加包扫描或者指定类
@SpringBootApplication @EnableScheduling @EnableTransactionManagement(proxyTargetClass = true) @ServletComponentScan(basePackageClasses = {com.binfo.sqgf.config.SqlInjectFilter.class}) public class SqgfApplication {
或者
@SpringBootApplication
@EnableAutoConfiguration
@EnableWebMvc
@ServletComponentScan(basePackages = "com.fanyin.eghm")
public class EghmApplication {
public static void main(String[] args) {
SpringApplication.run(EghmApplication.class, args);
}
}
listener
listener有contextListener, sessionListener,pageListener, beanListener 好多种
servletContextListener;
package com.iwhere.test.web.listener; import javax.servlet.ServletContextEvent; import javax.servlet.ServletContextListener; import javax.servlet.annotation.WebListener; /** * 使用注解的方式实现Contextlistener, 必须实现listener接口 * * @author wenbronk * @time 2017年3月17日 下午4:51:24 2017 */ @WebListener public class MyListener implements ServletContextListener{ @Override public void contextDestroyed(ServletContextEvent arg0) { System.out.println("servletContext destroyed"); } @Override public void contextInitialized(ServletContextEvent arg0) { System.out.println("servletContext init"); } }
sessionListener
package com.iwhere.test.web.listener; import javax.servlet.annotation.WebListener; import javax.servlet.http.HttpSessionEvent; import javax.servlet.http.HttpSessionListener; /** * sessionListener, 监听session的创建和销毁 * @author wenbronk * @time 2017年3月17日 下午4:56:22 2017 */ @WebListener public class MySessionListener implements HttpSessionListener { @Override public void sessionCreated(HttpSessionEvent arg0) { System.out.println("HttpSession created"); } @Override public void sessionDestroyed(HttpSessionEvent arg0) { System.out.println("HttpSession destroyed"); } }
补充一点, 在listener中使用 springboot的 工厂
mongoTemplate = WebApplicationContextUtils.getWebApplicationContext(sce.getServletContext()).getBean(MongoTemplate.class);