request.getURL()和request.getURI()
如果我的请求是：http://localhost:8080/ServletTest/servlet/Hello request.getRequestURI() 返回值类似：/ServletTest/servlet/Hello
request.getRequestURL() 返回值类似：http://localhost:8080/ServletTest/servlet/Hello
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再如：
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request.getContextPath() = /ServletTest
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request.getLocalAddr() = 127.0.0.1
request.getPathInfo() = null
request.getPathTranslated() = null
request.getRemoteAddr() = 127.0.0.1
request.getRequestURI() = /ServletTest/servlet/Hello
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request.getScheme() = http
request.getServerName() = 127.0.0.1
request.getServletPath() = /servlet/Hello
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request.getClass() = class org.apache.catalina.connector.RequestFacade
request.getHeaderNames() = org.apache.tomcat.util.http.NamesEnumerator@1fb050c
request.getLocale() = zh_CN
request.getLocales() = org.apache.catalina.util.Enumerator@1088a1b
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request.getParameterMap() = {}
request.getRequestURL() = http://127.0.0.1:8080/ServletTest/servlet/Hello
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request.getUserPrincipal() = null
request.getParameterNames() = java.util.Hashtable$EmptyEnumerator@1db6942
request.getRealPath("newsPub") =
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D:\zfsca\.metadata\.plugins\com.genuitec.eclipse.easie.tomcat.myeclipse\tomcat\webapps\ServletTest\newsPub
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request.getRealPath("/") =
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D:\zfsca\.metadata\.plugins\com.genuitec.eclipse.easie.tomcat.myeclipse\tomcat\webapps\ServletTest\
