1 关闭NetworkManager

由于NetworkManager和wpa_supplicant之间存在冲突，因此需要关闭NetworkManager 

service NetworkManger stop  //停止Networkmanger 服务
chkconfig NetworkManger off //设置NetworkManger 不要随系统启动

2 iwlist scanning

执行 

iwlist [你的网卡名] scanning

得到类似如下的内容 

wlan0     Scan completed :
	  Cell 01 - Address: 90:94:E4:CE:86:AE
		    Channel:5
		    Frequency:2.432 GHz (Channel 5)
		    Quality=70/70  Signal level=-30 dBm
		    Encryption key:on
		    ESSID:"java14"
		    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
			      9 Mb/s; 12 Mb/s; 18 Mb/s
		    Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
		    Mode:Master
		    Extra:tsf=0000005efd238176
		    Extra: Last beacon: 706177ms ago
		    IE: Unknown: 00066A6176613134
		    IE: Unknown: 010882848B960C121824                    IE: Unknown: 030105
		    IE: Unknown: 2A0100
		    IE: Unknown: 32043048606C
		    IE: Unknown:
2D1A6E181EFFFF000000000000000000000000000000000000000000
		    IE: Unknown:
3D1605050000000000000000000000000000000000000000
		    IE: WPA Version 1
			Group Cipher : TKIP
			Pairwise Ciphers (2) : TKIP CCMP
			Authentication Suites (1) : PSK
		    IE: IEEE 802.11i/WPA2 Version 1
			Group Cipher : TKIP
			Pairwise Ciphers (2) : TKIP CCMP
			Authentication Suites (1) : PSK
		    ...
		    ...

3 wpa_passpharse

执行 wpa_passpharse [上面的essid] [密码] >> /etc/wpa_supplicant/wpa_supplicant.conf
查看wpa_supplicant.conf文件，内容大致如下 

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
network={
	ssid="java14" //换成你要链接的ssid
	#psk="20180812"
	psk=929655b42f1208c82241d21cd7102c3e3da231a22b2be362b0f3f22ced7f6cca
}

4 继续配置wpa_supplicant.conf 文件

配置完成后的文件内容如下（当路由器采用wpa2的加密方式时）： 

ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=wheel
network={
	ssid="java14" //换成你要链接的ssid
	scan_ssid=1
	key_mgmt=WPA-PSK //无论wpa2还是wpa都写WPA-PSK
	proto=RSN //代表要链接的是采用wpa2方式加密的网络，如果为wpa则去掉此行
	#psk="20180812"
	psk=929655b42f1208c82241d21cd7102c3e3da231a22b2be362b0f3f22ced7f6cca //密码
	pairwise=TKIP CCMP //参考上面 iwlist scanning 得出的结果的Pairwise Ciphers
	group=TKIP CCMP    //参考上面 iwlist scanning 得出的结果的Group Cipher
}

到此配置已完成，分别执行 

5.1wpa_supplicant -Dwext -iwlan0 -c /etc/wpa_supplicant/wpa_supplicant.conf
5.2dhclient wlan0

至此网络连通。