请求路径:http://localhost:8080/projectname/myservlet/somepath/test?someparam=somevalue
request.getPathInfo(); //返回/somepath/test
request.getRequestURL(); //返回http://localhost:7001/myservlet/somepath/test
request.getRequestURI();//返回/myservlet/somepath/test
request.getServletPath();//返回/myservlet
request.getQueryString();//返回someparam=somevalue
HTTP请求路径解析
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