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This article will explain in detail how SpringBoot integrates Filter. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

SpringBoot integrates filter 1, creates a basic SpringBoot project, and integrates Web to org.springframework.bootspring-boot-starter-web 2. Method 1: inject 1. Create a Filter component

Com.zhl.springbootweb.filter.FirstFilter

UrlPatterns can specify a suffix or URL

Implement @ WebFilter annotations

Integrate Filter in javax.servlet

Package com.zhl.springbootweb.filter;import javax.servlet.*;import javax.servlet.annotation.WebFilter;import java.io.IOException / * integrate Filter mode: * / / @ WebFilter (filterName = "first Filter", urlPatterns = {"* .do", "* .jsp"}) @ WebFilter (filterName = "first Filter", urlPatterns = {"/ first"}) public class FirstFilter implements Filter {@ Override public void init (FilterConfig filterConfig) throws ServletException {} @ Override public void doFilter (ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {System.out.println ("enter FirstFilter") / * release * / filterChain.doFilter (servletRequest,servletResponse); System.out.println ("leave First Filter");} @ Override public void destroy () {}} 2. The startup class needs to be annotated @ ServletComponentScan@SpringBootApplication/* scans @ WebServlet,@WebFilter annotation when SpringBoot starts, and instantiates * / @ ServletComponentScanpublic class SpringbootWebApplication {public static void main (String [] args) {SpringApplication.run (SpringbootWebApplication.class, args);}} 3. test

Visit localhost:8080/first

Enter First FilterFirst Servlet and leave First Filter 3. Mode 2: use method injection 1. Create Filter

Com.zhl.springbootweb.filter.SecondFilter

Package com.zhl.springbootweb.filter;import javax.servlet.*;import java.io.IOException;/** Integration Filter 2 * * / public class SecondFilter implements Filter {@ Override public void init (FilterConfig filterConfig) throws ServletException {} @ Override public void doFilter (ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {System.out.println ("enter SecondFilter"); / * release * / filterChain.doFilter (servletRequest,servletResponse) System.out.println ("leave SecondFilter");} @ Override public void destroy () {}} 2. Create a configuration class / * Filter configuration class * / @ Configurationpublic class FilterConfig {@ Bean public FilterRegistrationBean getFilterRegistrationBean () {FilterRegistrationBean bean = new FilterRegistrationBean (new SecondFilter ()); / / bean.addUrlPatterns (new String [] {"* .do", "* .jsp"}); bean.addUrlPatterns ("/ second"); return bean;} 3. test

Visit http://localhost:8080/second

Enter SecondFilterSecond Servlet and leave SecondFilter to share here on how SpringBoot integrates Filter. I hope the above content can be helpful to everyone and learn more knowledge. If you think the article is good, you can share it for more people to see.

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