springboot整合filter

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新建一个项目

新建Firstfilter类

Firstfliter.java

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;

/**

 *SpringBoot 整合 Filter 方式一

 *<filter>

 * <filter-name>FirstFilter</filter-name>

 * <filter-class>com.bjsxt.filter.FirstFilter</filter-class>

 *</filter>

 *<filter-mapping>

 * <filter-name>FirstFilter</filter-name>

 * <url-pattern>/first</url-pattern>

 *</filter-mapping>

 */

@WebFilter(filterName = "Firstfilter",urlPatterns = "/first")

public class Firstfilter implements Filter{

    @Override

    public void destroy() {

    }

    @Override

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

            throws IOException, ServletException {

        System.out.println("进入 Filter");

        arg2.doFilter(arg0, arg1);

        System.out.println("离开 Filter");

    }

    @Override

    public void init(FilterConfig arg0) throws ServletException {

    }

}

新建servlet包，同时在包内新建FirstServlet类

FirstServlet.java类

package com.example.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 *SpringBoot整合Servlet方式一

 *

 *<servlet>

 *    <servlet-name>FirstServlet</servlet-name>

 *    <servlet-class>com.bjsxt.servlet.FirstServlet</servlet-class>

 *</servlet>

 *

 *<servlet-mapping>

 * <servlet-name>FirstServlet</servlet-name>

 * <url-pattern>/first</url-pattern>

 *</servlet-mapping>

 *

 */

@WebServlet(name="FirstServlet",urlPatterns="/first")

public class FirstServlet extends HttpServlet {

    @Override

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        System.out.println("FirstServlet............");

    }

}

新建一个App.java启动类

App.java类

package com.example;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

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

/**

 *SpringBoot 整合 Filter 方式一

 *

 */

@SpringBootApplication

@ServletComponentScan

public class App {

  public static void main(String[] args)

  {

      SpringApplication.run(App.class,args);

  }

}

运行启动类

在浏览器运行

在终端打印出

现在用第二种方式整合filter

新建SecndFilter类

新建SecndServlet类

SecondServlet.java

package com.example.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 *SpringBoot整合Servlet方式二

 *

 */

public class SecondServlet extends HttpServlet {

    @Override

    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        System.out.println("SecondServlet..........");

    }

}

新建启动类App2.java

App2.java类

package com.example;

import com.example.filter.SecondFilter;

import com.example.servlet.SecondServlet;

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;

/**

 * SpringBoot 整合 Filter 方式二

 * * *

 */

@SpringBootApplication

public class App2 {

    public  static void main(String[] args){

        SpringApplication.run(App2.class,args);

    }

    /**

     * 注册 Servlet

     * @return

     */

    @Bean

    public ServletRegistrationBean getServletRegistrationBean(){

        ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());

        bean.addUrlMappings("/second");

        return bean;

    }

    /**

     * 注册 Filter

    */

 @Bean

    public FilterRegistrationBean getFilterRegistrationBean() {

        FilterRegistrationBean bean = new FilterRegistrationBean(new SecondFilter());

        //bean.addUrlPatterns(new String[]{"*.do","*.jsp"});

        bean.addUrlPatterns("/second");

        return bean;

    }

}

运行App2.java类