request.getRequestURL()和request.getRequestURI()的區別

request.getRequestURL() 返回全路徑
request.getRequestURI() 返回除去host（域名或者ip）部分的路徑
request.getContextPath() 返回工程名部分，如果工程映射爲/，此處返回則爲空
request.getServletPath() 返回除去host和工程名部分的路徑
 

例如：

request.getRequestURL() http://localhost:8080/jqueryLearn/resources/request.jsp 
request.getRequestURI() /jqueryLearn/resources/request.jsp
request.getContextPath()/jqueryLearn 
request.getServletPath()/resources/request.jsp 

https://blog.csdn.net/kaikaixinxiyiwannian/article/details/78732410