SpringBoot整合Filter

以前编写配置 Filter

<filter>
  <filter-name>FirstFilter</filter-name>
  <filter-class>com.neuedu.filter.FirstFilter</filter-class>
</filter>

<filter-mapping>
  <filter-name>FirstFilter</filter-name>
  <url-pattern>/first</url-pattern>
</filter-mapping>

SpringBoot 整合Filter方式一

通过注解扫描完成Filter组件的注册

• 编写Filter

package com.neuedu.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;
/**
* SpringBoot 整合Filter 方式一
* @author 清水三千尺
*
*/
//@WebFilter(filterName="",urlPatterns= {"*.do","*.jsp"}) 这是拦截多个URL的写法
@WebFilter(filterName="",urlPatterns="/first")
public class FirstFilter implements Filter {
  @Override
  public void destroy() {
      // TODO Auto-generated method stub  
  }

  @Override
  public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
          throws IOException, ServletException {
      System.out.println("进入Filter。。。。");
      //放行操作
      arg2.doFilter(arg0, arg1);
      System.out.println("离开Filter。。。。");
  }
  
  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
      // TODO Auto-generated method stub  
  }
}

• 编写启动类

package com.neuedu;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
/**
* SpringBoot 启动类
* @author 清水三千尺
*
*/
@SpringBootApplication
@ServletComponentScan //在SpringBoot启动时会扫描@WebFileter，并将该类实例化
public class App {
  public static void main(String[] args) throws Exception {
      SpringApplication.run(App.class, args);
  }
}

• 启动测试

浏览器访问：http://localhost:8080/frist

控制台结果：

SpringBoot 整合Filter方式二

通过方法完成Filter组件的注册

• 编写Filter

package com.neuedu.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;
/**
* SpringBoot 整合Filter 方式二
* @author 清水三千尺
*
*/
public class SecondFilter implements Filter {
  @Override
  public void destroy() {
      // TODO Auto-generated method stub  
  }

  @Override
  public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2)
          throws IOException, ServletException {
      System.out.println("进入SecondFilter。。。。");
      //放行操作
      arg2.doFilter(arg0, arg1);
      System.out.println("离开SecondFilter。。。。");
  }
  
  @Override
  public void init(FilterConfig filterConfig) throws ServletException {
      // TODO Auto-generated method stub  
  }
}

• 编写启动类

package com.neuedu;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import com.neuedu.filter.SecondFilter;
import com.neuedu.servlet.SecondServlet;

/**
* SpringBoot 启动类
* @author 清水三千尺
*
*/
@SpringBootApplication
public class App2 {
  public static void main(String[] args) throws Exception {
      SpringApplication.run(App2.class, args);
  }
  
  /**
   * 注册Servlet
   */
  @Bean
  public ServletRegistrationBean<SecondServlet> getServletRegistrationBean() {
      //完成SecondServlet的注册
      ServletRegistrationBean<SecondServlet> bean = new ServletRegistrationBean<SecondServlet>(new SecondServlet());
      //完成url的指定
      bean.addUrlMappings("/second");
      return bean;
  }
  
  /**
   * 注册Filter
   */
  @Bean
  public FilterRegistrationBean<SecondFilter> getFilterRegistrationBean() {
      //完成SecondFilter的注册
      FilterRegistrationBean<SecondFilter> bean = new FilterRegistrationBean<SecondFilter>(new SecondFilter());
      //完成url的指定(需要拦截的URL)
      //bean.addUrlPatterns(new String[] {"*.do","*.jsp"}); 指定多个URL
      bean.addUrlPatterns("/second");
      return bean;
  }
}

• 启动测试

浏览器访问：http://localhost:8080/second

控制台结果：