简介
Filter, Listener 是 Java web 的核心内容，那么springBoot怎么使用它们那？
自定义过滤器
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| package com.qn.filter;
import com.qn.interceptor.LogHandlerInterceptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;
@WebFilter(urlPatterns = "/*")
public class LogFilter implements Filter {
Logger logger = LoggerFactory.getLogger(LogHandlerInterceptor.class);
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
logger.info("过滤器生效！！！");
filterChain.doFilter(servletRequest, servletResponse);
}
}
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自定义监听器
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| package com.qn.listener;
import com.qn.interceptor.LogHandlerInterceptor;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
import javax.servlet.annotation.WebListener;
@WebListener
public class LogListener implements ServletContextListener {
Logger logger = LoggerFactory.getLogger(LogHandlerInterceptor.class);
@Override
public void contextInitialized(ServletContextEvent sce) {
logger.info("监听器开始初始化");
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
logger.info("监听器开始销毁");
}
}
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注册
添加到容器有两种方式，第一种使用注解扫描。
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@SpringBootApplication
@ServletComponentScan
public class SpringbootDemoApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootDemoApplication.class, args);
}
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或者直接添加到容器中去：
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| package com.qn.config;
import com.qn.filter.LogFilter;
import com.qn.listener.LogListener;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.context.annotation.Bean;
@SpringBootConfiguration
public class WebCoreConfig {
@Bean
public FilterRegistrationBean myFitler() {
return new FilterRegistrationBean<>(new LogFilter());
}
@Bean
public ServletListenerRegistrationBean myListener() {
return new ServletListenerRegistrationBean(new LogListener());
}
}
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