request.getRequestURL() 返回全路径
request.getRequestURI() 返回除去host（域名或者ip）部分的路径
request.getContextPath() 返回工程名部分，如果工程映射为/，此处返回则为空
request.getServletPath() 返回除去host和工程名部分的路径
request.getRequestURL() http://localhost:8080/district_number/html/dataProcess.html
request.getRequestURI() /district_number/html/dataProcess.html
request.getContextPath()/district_number
request.getServletPath()html/dataProcess.html
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本文标题：request.getRequestURL()和request.
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