Spring Boot的filter（过滤器）简单使用实例详解

时间：2021-05-09 07:43:58|栏目：JAVA代码|点击：次

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 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);
  }
}

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