content: package com.spring4all.config;
  
  import org.springframework.security.config.annotation.web.builders.HttpSecurity;
  import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
  import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
  import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
  
  @EnableWebSecurity
  public class WebSecurityConfig extends WebSecurityConfigurerAdapter{
  
      /**
       * 匹配 "/" 路径，不需要权限即可访问
       * 匹配 "/user" 及其以下所有路径，都需要 "USER" 权限
       * 退出登录的地址为 "/logout"，退出成功后跳转到页面 "/login"
       * 默认启用 CSRF
       */
      @Override
      protected void configure(HttpSecurity http) throws Exception {
          http
                  .authorizeRequests()
                  .antMatchers("/").permitAll()
                  .antMatchers("/user/**").hasAuthority("USER")
                  .and()
                  .logout().logoutUrl("/logout").logoutSuccessUrl("/login");
  
          http.addFilterAt(customFromLoginFilter(), UsernamePasswordAuthenticationFilter.class);
      }
  
      /**
       * 自定义认证过滤器
       */
      private CustomFromLoginFilter customFromLoginFilter() {
          return new CustomFromLoginFilter("/login");
      }
  
  }
  