SpringBoot-----Security安全机制的sessions配置策略

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1、配置security.sessions策略

#安全配置
security:
  sessions: stateless
  basic:
    enabled: true #启用SpringSecurity的安全配置
  user:
    name: wendy #认证用户名
    password: wendy1 #认证密码
    role:  #授权
    - USER

2、security.sessions策略如下：

always：保存session状态（每次会话都保存，可能会导致内存溢出【Always create an {@link HttpSession}】）

never：不会创建HttpSession，但是会使用已经存在的HttpSession[Spring Security will never create an {@link HttpSession}]

if_required：仅在需要HttpSession创建【Spring Security will only create an {@link HttpSession} if required】

stateless：不会保存session状态【 Spring Security will never create an {@link HttpSession} and it will never use it
     * to obtain the {@link SecurityContext}】

注意：stateless策略推荐使用，也是默认配置

3、具体跟查看源代码SecurityProperties.java的配置项

/**
	 * Session creation policy (always, never, if_required, stateless).
	 */
	private SessionCreationPolicy sessions = SessionCreationPolicy.STATELESS;

/*
 * Copyright 2002-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.security.config.http;

import javax.servlet.http.HttpSession;

import org.springframework.security.core.context.SecurityContext;

/**
 * Specifies the various session creation policies for Spring Security.
 *
 * @author Luke Taylor
 * @since 3.1
 */
public enum SessionCreationPolicy {
	/** Always create an {@link HttpSession} */
	ALWAYS,
	/**
	 * Spring Security will never create an {@link HttpSession}, but will use the
	 * {@link HttpSession} if it already exists
	 */
	NEVER,
	/** Spring Security will only create an {@link HttpSession} if required */
	IF_REQUIRED,
	/**
	 * Spring Security will never create an {@link HttpSession} and it will never use it
	 * to obtain the {@link SecurityContext}
	 */
	STATELESS
}