springboot过滤器和拦截器以及监听器的代码怎么写
springboot过滤器和拦截器以及监听器的代码怎么写，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。
简单的springboot 过滤器，拦截器，监听器 使用
pom.xml
过滤器，使用的servlet3 规范
package com.soft.m;
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;
import javax.servlet.http.HttpServletRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
@WebFilter(filterName="MyFilter",urlPatterns="/*")
public class MyFilter implements Filter {
private static Logger LOG = LoggerFactory.getLogger(MyFilter.class);
public void init(FilterConfig filterConfig) throws ServletException {
LOG.info("初始化过滤器");
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
String requestURI = req.getRequestURI();
LOG.info("过滤到的请求--->"+requestURI);
chain.doFilter(request, response);
}
public void destroy() {
LOG.info("destroy过滤器");
}
}
监听器 也是servlet 规范
servletContextListener 监听
package com.soft.m;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.stereotype.Component;
@Component
@WebListener("WebListener")
@ServletComponentScan("com.soft.m")
public class MyListener implements ServletContextListener {
private static Logger LOG = LoggerFactory.getLogger(MyListener.class);
public void contextInitialized(ServletContextEvent sce) {
;
LOG.info("init:"+sce.getSource().getClass().toString());
}
public void contextDestroyed(ServletContextEvent sce) {
// TODO Auto-generated method stub
LOG.info("contextDestroyed");
}
}
session监听器
package com.soft.m;
import javax.servlet.annotation.WebListener;
import javax.servlet.http.HttpSessionEvent;
import javax.servlet.http.HttpSessionListener;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
@WebListener
public class MySessionListener implements HttpSessionListener {
private static Logger LOG = LoggerFactory.getLogger(MySessionListener.class);
public void sessionCreated(HttpSessionEvent se) {
LOG.info("sessionCreated："+se.getSession().getId());
}
public void sessionDestroyed(HttpSessionEvent se) {
LOG.info("sessionDestroyed："+se.getSession().getId());
}
}
servlet拦截器
package com.soft.m;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
public class MyInterceptor implements HandlerInterceptor {
private static Logger logger = LoggerFactory.getLogger(MyFilter.class);
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
HandlerMethod m=(HandlerMethod)handler;
logger.info("preHandle:"+ m.getBeanType().toString());
return true;
}
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
// TODO Auto-generated method stub
logger.info("postHandle");
}
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
logger.info("afterCompletion");
}
}
拦截起配置
package com.soft.m;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class MyWebMvcConfigurerAdapter implements WebMvcConfigurer {
public void addInterceptors(InterceptorRegistry registry) {
// TODO Auto-generated method stub
registry.addInterceptor(new MyInterceptor()).addPathPatterns("/*");
}
public void addResourceHandlers(ResourceHandlerRegistry registry) {
//registry.addResourceHandler("/*.ico");
}
}
springboot 启动的类
package com.soft.m;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MApplication {
public static void main(String[] args) {
SpringApplication.run(MApplication.class, args);
}
}
controler 类例子
package com.soft.m;
import javax.servlet.http.HttpServletRequest;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@ResponseBody
public class HelloController {
@RequestMapping("/hello")
public String hello(){
return "HelloController中的hello方法";
}
@RequestMapping("/create")
public String create(HttpServletRequest request){
request.getSession().setAttribute("aaa", "234");
return "HelloController中的create方法";
}
@RequestMapping("/destory")
public String destory(HttpServletRequest request){
request.getSession().invalidate();
return "HelloController中的destory方法";
}
}
看完上述内容，你们掌握springboot过滤器和拦截器以及监听器的代码怎么写的方法了吗？如果还想学到更多技能或想了解更多相关内容，欢迎关注行业资讯频道，感谢各位的阅读！
