spring-boot- study notes (c) - Filter

Filters There are two configurations, one kind of annotation is done by a custom configuration class by setting

assumed here that the scene is, define a filter, filter all requests, if there is no username parameter information to redirect login_page to the login page, if it is released with a username

Notes -WebFilter

package com.example.demo.myFilter;

import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;


* @Author Fengxi 
* @date 2019-03-06 10:47 
* /


(value = "/ *" )     // WebFilter annotation tells the spring it is a filter 
@Component       // the Component annotation indicates that this is a component, you need to create an instance of a 
public  class    the implements  the Filter  { @Override public void the init (FilterConfig FilterConfig ) throws ServletException {         System.out.println ( "the init, the service starts is called" );     }
    
       



    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        String path = req.getRequestURI();
        HttpSession session = req.getSession();
        if (req.getParameter("username") != null){
            // 放行
            chain.doFilter(request, response);
        }else {
            System.out.println(path);
            if (path.equals("/login_page")) {
                // 如果本身访问的是登录页面，直接放行
                the chain.doFilter (Request, Response); 
            } the else { // No username, a non-access login page redirected to a login page                 the HttpServletResponse RESP = (the HttpServletResponse) Response;                 resp.sendRedirect ( "login_page" );             }         }
                





    }

    @Override public void the destroy () {         System.out.println ( "the destroy, in time to stop the service program will be called" );     } }

Code configuration

1. Do not use annotations in fitler implementation class

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大专栏  spring-boot-学习笔记（三）-过滤器ss="line">25
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package com.example.demo.myFilter;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;


 * @author fengxi
 * @date 2019-03-06 15:31
 */
public class secondFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println("init");
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        HttpServletRequest req = (HttpServletRequest) request;
        String path = req.getRequestURI();
        HttpSession session = req.getSession();
        if (req.getParameter("username") != null){
            chain.doFilter(request, response);
        }else {
            System.out.println(path);
            if (path.equals("/login_page")) {
                chain.doFilter(request, response);
            } else {
                HttpServletResponse resp = (HttpServletResponse) response;
                resp.sendRedirect("login_page");
            }
        }
    }

    @Override
    public void destroy() {
        System.out.println("destroy");
    }
}

2。使用configuration注解定义过滤器

package com.example.demo.config;

import com.example.demo.myFilter.secondFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;


 * @author fengxi
 * @date 2019-03-06 15:30
 */

@Configuration
public class myConfig {

    @Bean ( "Bean1" ) public FilterRegistrationBean registerFilter1 () { // create a filter register bean objects         FilterRegistrationBean Bean1 = new new FilterRegistrationBean (); // set the object to configure a filter         bean1.setFilter ( new new secondFilter ()); // add the filter rules to filter url         bean1.addUrlPatterns ( "/ *" ); // set the priority level, a number of the first filter performs execution         bean1.setOrder ( . 1 ); return Bean1;     } }

spring-boot- study notes (c) - Filter

Notes -WebFilter

Code configuration

1. Do not use annotations in fitler implementation class

2。 使用configuration注解定义过滤器

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2。使用configuration注解定义过滤器