@WebFilter注解過濾器

@WebFilter加在過濾器的注解上使用

import lombok.extern.slf4j.Slf4j;

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 java.io.IOException;

@WebFilter(urlPatterns = "/*")
@Slf4j
public class WebFilterTest implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.info("WebFilterTest --- init");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.info("WebFilterTest --- doFilter");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {
        log.info("WebFilterTest --- destroy");
    }
}

@WebFilter源碼:

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface WebFilter {
    String description() default "";
    /**Filter顯示名*/
    String displayName() default "";
    /**配置參數(shù)*/
    WebInitParam[] initParams() default {};
    /**Filter名稱*/
    String filterName() default "";

    String smallIcon() default "";

    String largeIcon() default "";
    /**指定對(duì)哪些Servlet進(jìn)行過濾*/
    String[] servletNames() default {};
    /**指定攔截的路徑*/
    String[] value() default {};
    /**指定攔截的路徑*/
    String[] urlPatterns() default {};
    /**指定Filter對(duì)哪種方式的請(qǐng)求進(jìn)行過濾*/
    DispatcherType[] dispatcherTypes() default {DispatcherType.REQUEST};
    /**指定Filter是否支持異步模式*/
    boolean asyncSupported() default false;
}

在springBoot的啟動(dòng)類中加入注解:

import org.springframework.boot.web.servlet.ServletComponentScan;

@ServletComponentScan

多個(gè)@WebFilter注解的過濾器可以配合@Order()注解實(shí)現(xiàn)執(zhí)行過濾的順序

import org.springframework.core.annotation.Order;

@WebFilter(urlPatterns = "/*")
@Slf4j
@Order(1)
public class WebFilterTest implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.info("WebFilterTest --- init");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.info("WebFilterTest --- doFilter");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {
        log.info("WebFilterTest --- destroy");
    }
}

@WebFilter(urlPatterns = "/*")
@Slf4j
@Order(2)
public class WebFilterTest2 implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.info("2---WebFilterTest2 --- init");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.info("2 --- WebFilterTest2 --- doFilter");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {
        log.info("WebFilterTest2 --- destroy");
    }
}

執(zhí)行結(jié)果

WebFilterTest --- doFilter
2 --- WebFilterTest2 --- doFilter

不使用注解的方式使用過濾器

創(chuàng)建過濾器類

public class WebFilterTest implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.info("WebFilterTest --- init");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.info("WebFilterTest --- doFilter");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {
        log.info("WebFilterTest --- destroy");
    }
}

注冊過濾器

@Configuration
public class FilterConfig {

    @Bean
    public WebFilterTest webFilterTest(){
        return new WebFilterTest();
    }

    @Bean
    public FilterRegistrationBean filterRegist(){
        FilterRegistrationBean frBean = new FilterRegistrationBean();
        frBean.setFilter(webFilterTest());
        frBean.setOrder(1);
        frBean.addUrlPatterns("/*");
        return  frBean;
    }
}

多個(gè)過濾器注冊

再添加一個(gè)過濾器:

@Slf4j
public class WebFilterTest2 implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        log.info("2---WebFilterTest2 --- init");
    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        log.info("2 --- WebFilterTest2 --- doFilter");
        filterChain.doFilter(servletRequest,servletResponse);
    }

    @Override
    public void destroy() {
        log.info("WebFilterTest2 --- destroy");
    }
}

修改配置類:

@Configuration
public class FilterConfig {

    @Bean
    public WebFilterTest webFilterTest(){
        return new WebFilterTest();
    }
     @Bean
    public WebFilterTest2 webFilterTest2(){
        return new WebFilterTest2();
    }

    @Bean
    public FilterRegistrationBean filterRegist(){
        FilterRegistrationBean frBean = new FilterRegistrationBean();
        frBean.setFilter(webFilterTest());
        frBean.setOrder(1);
        frBean.addUrlPatterns("/*");
        return  frBean;
    }
    @Bean
    public FilterRegistrationBean filterRegist2(){
        FilterRegistrationBean frBean = new FilterRegistrationBean();
        frBean.setFilter(webFilterTest2());
        frBean.setOrder(2);
        frBean.addUrlPatterns("/*");
        return  frBean;
    }
}

本篇文章由一文多發(fā)平臺(tái)ArtiPub自動(dòng)發(fā)布