springboot @WebFilter注解过滤器的实现

springboot @WebFilter注解过滤器的实现

@WebFilter注解过滤器

@WebFilter加在过滤器的注解上使用

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.anhttp://notation.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源码:

@Target({ElementType.TYPE})

@Retention(RetentionPolicy.RUNTIME)

@Documented

public @interface WebFilter {

String description() default "";

/**Filter显示名*/

String displayName() default "";

/**配置参数*/

WebInitParam[] initParams() default {};

/**Filter名称*/

String filterName() default "";

String smallIcon() default "";

String largeIcon() default "";

/**指定对哪些Servlet进行过滤*/

String[] servletNames() default {};

/**指定拦截的路径*/

String[] value() default {};

/**指定拦截的路径*/

String[] urlPatterns() default {};

/**指定Filter对哪种方式的请求进行过滤*/

DispatcherType[] dispatcherTypes() default {DispatcherType.REQUEST};

/**指定Filter是否支持异步模式*/

boolean asyncSupported() default false;

}

在springBoot的启动类中加入注解:

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

@ServletComponentScan

多个@WebFilter注解的过滤器可以配合@Order()注解实现执行过滤的顺序

import org.springframework.core.annotation.Order;

@WebFilter(urlPatterns = "/*")

@Slf4j

@Order(1)

public class WebFilterTest implements Filter {

@Override

public void init(FilterConfihttp://g 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");

}

}

执行结果

WebFilterTest --- doFilter

2 --- WebFilterTest2 --- doFilter

不使用注解的方式使用过滤器

创建过滤器类

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");

}

}

注册过滤器

@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;

}

}

多个过滤器注册

再添加一个过滤器:

@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");

}

}

修改配置类:

@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;

}

}

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