在Spring Boot中整合Servlet、Filter和Listener可以通过以下方式：
- 创建Servlet类：
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class MyServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.getWriter().write("Hello from MyServlet");
}
}- 创建Filter类：
import javax.servlet.*;
import java.io.IOException;
public class MyFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// 初始化代码
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
// 在请求处理之前可以进行一些操作
chain.doFilter(request, response); // 继续请求处理
// 在请求处理之后可以进行一些操作
}
@Override
public void destroy() {
// 销毁代码
}
}- 创建Listener类：
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;
public class MyListener implements ServletContextListener {
@Override
public void contextInitialized(ServletContextEvent sce) {
// 应用启动时执行的代码
}
@Override
public void contextDestroyed(ServletContextEvent sce) {
// 应用关闭时执行的代码
}
}- 注册Servlet、Filter和Listener：
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class WebConfig {
@Bean
public ServletRegistrationBean myServlet() {
return new ServletRegistrationBean(new MyServlet(), "/myServlet");
}
@Bean
public FilterRegistrationBean myFilter() {
FilterRegistrationBean registration = new FilterRegistrationBean(new MyFilter());
registration.addUrlPatterns("/myServlet");
return registration;
}