Linux
vi /etc/hosts
最后一行添加你要映射的ip对应的地址
192.168.0.1 cas.demo.com
windows
很多人不知道hosts文件放在哪里？
C:\Windows\System32\drivers\etc
# Copyright (c) 1993-2009 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host
# localhost name resolution is handled within DNS itself.
# 127.0.0.1 localhost
# ::1 localhost
192.168.0.1 cas.demo.com
使用局域网代理的朋友需要注意：把改网址添加为不需要代理访问。
chrome浏览器->设置->更改代理服务器设置->Internet属性->连接->局域网（LAN）设置->代理服务器->高级->代理设置->例外
