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 - request.getRequestURL()：返回全路径； - request.getRequestURI()：返回除去Host（域名或IP）部分的路径； - request.getContextPath()：返回工程名部分，如果工程映射为`/`，则返回为空； - request.getServletPath()：返回除去Host和工程名部分的路径； - request.getPathInfo()：仅返回传递到Servlet的路径，如果没有传递额外的路径信息，则此返回Null；

@RestController@RequestMapping("/filter")public class FilterByPass { @RequestMapping("/admin/hello") public String admin() { return "i am admin role."; } @RequestMapping("/operator/hello") public String operator() { return "i am operator role."; } @RequestMapping("/uri") public ResponseResult<String> uri(HttpServletRequest request) { String getRequestURI=request.getRequestURI(); String getContextPath=request.getContextPath(); String getServletPath=request.getServletPath(); String result="getRequestURI: "+getRequestURI+"\n" +"getContextPath: "+getContextPath+"\n" +"getServletPath: "+getServletPath+"\n"; if (result != null) { return new ResponseResult<>(result, "执行成功", 200); } return new ResponseResult<>("result is null", "执行成功", 200); }}

public class loginFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException {} @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {  } @Override public void destroy() {
 }}

@WebFilter(urlPatterns = "/*",filterName = "loginfilter")public class loginFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { System.out.println("LoginFilter init");
 } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { //具体拦截方式 HttpServletRequest uri=(HttpServletRequest) request; String requestUri=uri.getRequestURI();//用户路径 String servletPath=uri.getServletPath();//实际路径
 if(requestUri.startsWith("/filter/admin/hello")){ //Auth 鉴权函数，这里省略 System.out.println(" Need Auth "); return; } if (requestUri.endsWith("*.action")) { //对某类重要的接口鉴权 System.out.println(" Need Auth Action"); } System.out.println(" by pass "); chain.doFilter(request,response);
 }
 @Override public void destroy() { System.out.println("LoginFilter init"); }}

参考：/** * springboot 整合filter方式之一 *  * 以前web.xml配置： * <filter> * <filter-name>LoginFilter</filter-name> * <filter-class>com.xxx.filter.LoginFilter</filter-class> * </filter> *  * <filter-mapping> * <filter-name>LoginFilter</filter-name> * <url-pattern>/LoginFilter</url-pattern> * </filter-mapping> *  * FirstFilter**/

//filter/admin/hello /filter/..;/admin/hello/filter/./././admin/hello/filter/xxx/../admin/hello

@Override public String getRequestURI() {
 if (request == null) { throw new IllegalStateException( sm.getString("requestFacade.nullRequest")); }
 return request.getRequestURI(); }

 @Override public String getRequestURI() { return coyoteRequest.requestURI().toString(); }

 private final MessageBytes uriMB = MessageBytes.newInstance();  ···  public MessageBytes requestURI() { return uriMB; }

package com.range.demo.filter;import javax.servlet.*;import javax.servlet.annotation.WebFilter;import javax.servlet.http.HttpServletRequest;import java.io.IOException;@WebFilter(urlPatterns = "*.action",filterName = "urlfilter")public class UrlFilter implements Filter { @Override public void init(FilterConfig filterConfig) throws ServletException { System.out.println("UrlFilter init"); } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { System.out.println(" enter UrlFilter "); //具体拦截方式 HttpServletRequest uri=(HttpServletRequest) request; String requestUri=uri.getRequestURI();//用户路径 String servletPath=uri.getServletPath();//实际路径 String getPathInfo=uri.getPathInfo(); System.out.println("getRequestURI: "+requestUri); System.out.println("getServletPath: "+servletPath); System.out.println("getPathInfo: "+getPathInfo); if(requestUri.startsWith("/filter/admin/")&&requestUri.endsWith(".action")){ //Auth 鉴权函数，这里省略 System.out.println("UrlFilter Need Auth "); return; } System.out.println("UrlFilter by pass "); chain.doFilter(request,response); } @Override public void destroy() { System.out.println("UrlFilter init"); }}

多个过滤器的话，比如myservlet同时匹配到Afilter和Bfilter，Afilter中dofilter()之前的代码为A1，dofilter()之后的代码为A2；Bfilter中dofilter()之前的代码为B1，dofilter()之后的代码为B2.web.xml中的filter-mapping配置顺序为Bfilter在上，Afilter在下。那么执行顺序为B1 - A1 - myservlet - A2 - B2。

后缀filter 先加载，url后缀范围大的在前，范围小的在后

xxx.setOrder(2);#order值越小，Filter越早经过