/*
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Copyright [2020] [https://www.xiaonuo.vip]
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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Snowy采用APACHE LICENSE 2.0开源协议，您在使用过程中，需要注意以下几点：
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1.请不要删除和修改根目录下的LICENSE文件。
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2.请不要删除和修改Snowy源码头部的版权声明。
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3.请保留源码和相关描述文件的项目出处，作者声明等。
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4.分发源码时候，请注明软件出处 https://gitee.com/xiaonuobase/snowy
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5.在修改包名，模块名称，项目代码等时，请注明软件出处 https://gitee.com/xiaonuobase/snowy
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6.若您的项目无法满足以上几点，可申请商业授权，获取Snowy商业授权许可，请在官网购买授权，地址为 https://www.xiaonuo.vip
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*/
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package vip.xiaonuo.sys.core.filter;
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import vip.xiaonuo.core.consts.CommonConstant;
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import vip.xiaonuo.core.context.requestno.RequestNoContext;
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import javax.servlet.*;
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import javax.servlet.http.HttpServletResponse;
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import java.io.IOException;
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import java.util.UUID;
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/**
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* 对请求生成唯一编码
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*
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* @author yubaoshan
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* @date 2020/6/21 10:04
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*/
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public class RequestNoFilter implements Filter {
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@Override
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public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
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try {
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// 生成唯一请求号uuid
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String requestNo = UUID.randomUUID().toString();
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// 增加响应头的请求号
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HttpServletResponse httpServletResponse = (HttpServletResponse) response;
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httpServletResponse.addHeader(CommonConstant.REQUEST_NO_HEADER_NAME, requestNo);
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// 临时存储
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RequestNoContext.set(requestNo);
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// 放开请求
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chain.doFilter(request, response);
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} finally {
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// 清除临时存储的唯一编号
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RequestNoContext.clear();
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}
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}
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}
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