java.lang.Exception: Port 8083 already in use.
报这种错的原因，除了网上说的那些端口占用之类的解决办法之外呢，还会因为系统host文件出错，如果动了这个文件，把它还原了就好，我贴出我的文件当例子：
【java.lang.Exception: Port 8083 already in use.】
# 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:
#
#102.54.94.97rhino.acme.com# source server
#38.25.63.10x.acme.com# x client host# localhost name resolution is handled within DNS itself.
# 127.0.0.1localhost
# ::1localhost
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