Wireless access method and related device and system

1. A wireless access method, comprising:

reading, by a terminal device, wireless fidelity (WIFI) access point information stored in an external near field communication tag by means of approaching the external near field communication tag, wherein the WIFI access point information comprises a WIFI access point account and an access password bound to the WIFI access point account;

acquiring, by the terminal device, the read access point information as target access point information;

in a case that the target access point information is WIFI access point information, enabling a WIFI module when the WIFI module is disabled; and

establishing automatically, according to the target access point information, a wireless connection to an access point to which the target access point information belongs.

2. The method according to claim 1 , wherein the acquiring, by the terminal device, the read access point information as target access point information comprises:

detecting, by the terminal device, a signal strength value of an access point to which each piece of the read WIFI access point information belongs; and

selecting, by the terminal device, access point information of an access point whose signal strength value is the largest as the target access point information.

3. The method according to claim 1 , wherein the acquiring, by the terminal device, the read access point information as target access point information comprises:

detecting, by the terminal device, a signal strength value of an access point to which each piece of the read WIFI access point information belongs;

outputting, by the terminal device, each piece of the read WIFI access point information and the signal strength value of the access point to which the access point information belongs; and

detecting, by the terminal device, one piece of access point information that is selected by a user according to the signal strength value from the WIFI access point information output by the terminal device, and using the piece of access point information as a target access point information.

4. The method according to claim 1 , wherein the establishing automatically, by the terminal device according to the target access point information, a wireless connection to an access point to which the target access point information belongs comprises:

sending, by the terminal device according to a target access point account, a wireless connection request to an access point to which the target access point account belongs, wherein the wireless connection request comprises an access password bound to the target access point account; and receiving a wireless connection success response that is sent after the access point to which the target access point account belongs verifies that the access password bound to the target access point account is correct.

5. The method according to claim 1 , wherein the establishing automatically, by the terminal device according to the target access point information, a wireless connection to an access point to which the target access point information belongs comprises:

sending, by the terminal device according to a target access point account, a wireless connection request to an access point to which the target access point account belongs;

receiving, by the terminal device, prompt information sent by the access point to which the target access point account belongs, wherein the prompt information is used to prompt sending of an access password bound to the target access point account;

sending, by the terminal device, the access password bound to the target access point account to the access point to which the target access point account belongs; and

receiving, by the terminal device, a wireless connection success response that is sent after the access point to which the target access point account belongs verifies that the access password bound to the target access point account is correct.

6. A terminal device, comprising a processor, a near field communication (NFC), module and an input/output module that are connected to the processor by using an interface, a memory that is connected to the processor by using a bus, a coupler that is connected to the processor by using multiple network interfaces, and an antenna module that is connected to the coupler, wherein the memory stores a group of program code, and the processor is configured to invoke the program code stored in the memory, and is configured to:

control the NFC module to read wireless fidelity (WIFI) access point information stored in an external NFC tag by means of approaching the external NFC tag, wherein the WIFI access point information comprises a WIFI access point account and an access password bound to the WIFI access point account;

acquire the read access point information as target access point information;

in a case that the target access point information is WIFI access point information, enable a WIFI module when the WIFI module is disabled; and

establish automatically, according to the target access point information, a wireless connection between the antenna module and an access point to which the target access point information belongs.

7. The terminal device according to claim 6 , wherein the processor is configured to:

control the antenna module to detect a signal of an access point to which each piece of the read WIFI access point information belongs;

calculate a signal strength value that is of the access point to which each piece of the WIFI access point information belongs and that is detected by the antenna module; and

select access point information of an access point whose signal strength value is the largest as the target access point information.

8. The terminal device according to claim 6 , wherein the processor is configured to:

control the antenna module to detect a signal of an access point to which each piece of the read WIFI access point information belongs;

calculate a signal strength value that is of the access point to which each piece of the WIFI access point information belongs and that is detected by the antenna module;

control the input/output module to output each piece of the WIFI access point information and the signal strength value that is of the access point to which the WIFI access point information belongs and that is obtained by means of calculation; and

control the input/output module to detect one piece of access point information that is selected by a user according to the signal strength value from the access point information output by the input/output module, and use the piece of access point information as the target access point information.

9. The terminal device according to claim 6 , wherein the processor is configured to:

control the antenna module to send, according to a target access point account, a wireless connection request to an access point to which the target access point account belongs, wherein the wireless connection request comprises an access password bound to the target access point account, so that the antenna module receives a wireless connection success response that is sent after the access point to which the target access point account belongs verifies that the access password bound to the target access point account is correct.

10. The terminal device according to claim 6 , wherein the processor is configured to:

control the antenna module to send, according to a target access point account, a wireless connection request to an access point to which the target access point account belongs, so that the antenna module receives prompt information sent by the access point to which the target access point account belongs, wherein the prompt information is used to prompt sending of an access password bound to the target access point account, and so that the antenna module sends the access password bound to the target access point account to the access point to which the target access point account belongs, and receives a wireless connection success response that is sent after the access point to which the target access point account belongs verifies that the access password bound to the target access point account is correct.

11. The terminal device according to claim 6 , wherein the processor is configured to:

control the memory to store the read WIFI access point information;

determine whether a storage time of the WIFI access point information exceeds a preset threshold; and if the storage time exceeds the preset threshold, control the memory to delete the stored WIFI access point information.

12. The terminal device according to claim 6 , wherein the WIFI access point information comprises one or more pieces of WIFI access point information or Bluetooth access point information.

13. A wireless access system, comprising: a terminal device, and a near field communication tag and a WIFI access point to which target access point information belongs that are independent of the terminal device, wherein:

the near field communication tag is configured to store WIFI access point information, wherein the WIFI access point information comprises a WIFI access point account and an access password bound to the WIFI access point account; and

the terminal device is configured to: read the WIFI access point information stored in the near field communication tag by means of approaching the near field communication tag, acquire the read access point information as target access point information, in a case that the target access point information is WIFI access point information, enable the WIFI access point if the WIFI access point is disabled, and establish automatically, according to the target access point information, a wireless connection to the access point to which the target access point information belongs.

14. The system according to claim 13 , wherein a manner in which the terminal device acquires the read access point information as target access point information is as follows:

the terminal device is configured to: detect a signal strength value of an access point to which each piece of the read WIFI access point information belongs, and select access point information of an access point whose signal strength value is the largest as a target access point account.

15. The system according to claim 13 , wherein a manner in which the terminal device acquires the read access point information as target access point information is as follows:

the terminal device is configured to: detect a signal strength value of an access point to which each piece of the read WIFI access point information belongs, and output each piece of the read WIFI access point information and the detected signal strength value of the access point to which the access point information belongs; and detect one piece of access point information that is selected by a user according to the signal strength value from the access point information output by the terminal device, and use the piece of access point information as the target access point information.

16. The system according to claim 13 , wherein a manner in which the terminal device establishes automatically, according to the target access point information, the wireless connection to the access point to which the target access point information belongs is as follows:

the terminal device is configured to: send, according to a target access point account, a wireless connection request to an access point to which the target access point account belongs, wherein the wireless connection request comprises an access password bound to the target access point account; and receive a wireless connection success response that is sent after the access point to which the target access point account belongs verifies that the access password bound to the target access point account is correct.

17. The system according to claim 13 , wherein the terminal device is further configured to: store the WIFI access point information after reading the WIFI access point information stored in the near field communication tag; after storing the WIFI access point information, determine whether a storage time of the WIFI access point information exceeds a preset threshold; and if the storage time exceeds the preset threshold, delete the stored WIFI access point information.