spring ServletRequestPathFilter 源码
spring ServletRequestPathFilter 代码
文件路径：/spring-web/src/main/java/org/springframework/web/filter/ServletRequestPathFilter.java
/*
* Copyright 2002-2021 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
*
* https://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.web.filter;
import java.io.IOException;
import jakarta.servlet.Filter;
import jakarta.servlet.FilterChain;
import jakarta.servlet.ServletException;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.http.server.RequestPath;
import org.springframework.web.util.ServletRequestPathUtils;
/**
* A {@code Filter} to {@link ServletRequestPathUtils#parseAndCache parse}
* and cache a {@link org.springframework.http.server.RequestPath} for further
* {@link ServletRequestPathUtils#getParsedRequestPath access} throughout the
* filter chain. This is useful when parsed
* {@link org.springframework.web.util.pattern.PathPattern}s are in use anywhere
* in an application instead of String pattern matching with
* {@link org.springframework.util.PathMatcher}.
* <p>Note that in Spring MVC, the {@code DispatcherServlet} will also parse and
* cache the {@code RequestPath} if it detects that parsed {@code PathPatterns}
* are enabled for any {@code HandlerMapping} but it will skip doing that if it
* finds the {@link ServletRequestPathUtils#PATH_ATTRIBUTE} already exists.
*
* @author Rossen Stoyanchev
* @since 5.3
*/
public class ServletRequestPathFilter implements Filter {
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
RequestPath previousRequestPath = (RequestPath) request.getAttribute(ServletRequestPathUtils.PATH_ATTRIBUTE);
ServletRequestPathUtils.parseAndCache((HttpServletRequest) request);
try {
chain.doFilter(request, response);
}
finally {
ServletRequestPathUtils.setParsedRequestPath(previousRequestPath, request);
}
}
}
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