Spring Boot的filter（过滤器）简单使用实例详解

Spring Boot的filter（过滤器）简单使用实例详解

过滤器（Filter）的注册方法和 Servlet 一样，有两种方式：代码注册或者注解注册

1.代码注册方式

通过代码方式注入过滤器

@Bean

public FilterRegistrationBean indexFilterRegistration() {

FilterRegistrationBean registration = new FilterRegistrationBean(new IndexFilter());

registration.addUrlPatterns("/");

return registration;

}

IndexFilter.java类：

package com.example.filter;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

public class IndexFilter implements Filter{

@Override

public void destroy() {

System.out.println("filter destroy method");

}

@Override

public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)

throws IOException, ServletException {

System.out.println("filter doFilter method");

}

@Override

public void init(FilterConfig arg0) throws ServletException {

System.out.println("filter init method");

}

}

2.注解方式

通过注解方式注入过滤器

IndexFilter2.java类

package com.example.filter;

import java.io.IOException;

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;

@WebFilter(urlPatterns = "/*", filterName = "indexFilter2")

public class IndexFilter2 implements Filter{

@Override

public void destroy() {

System.out.println("filter2 destroy method");

}

@Override

public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)

throws IOException, ServletException {

System.out.println("filter2 doFilter method");

}

@Override

public void init(FilterConfig arg0) throws ServletException {

System.out.println("filter2 http://init method");

}

}

把注解加到入口处启动即可

@SpringBootApplication

@ServletComponentScan

public class SpringBootSimpleApplication {

public static void main(String[] args) {

SpringApplication.run(SpringBootSimpleApplication.class, args);

}

}

以上所述是给大家介绍的Spring Boot的filter（过滤器）简单使用，希望对大家有所帮助，如果大家有任何疑问请给我留言，会及时回复大家的。在此也非常感谢大家对我们网站的支持！

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