1. Winscp connects to the linux server with a key
The first step is to generate the ssh public key key pair:
Use Tera Term to log in to the server (at this time, log in with your username and password first),
#ssh-keygen -t rsa
cd into the /root/.ssh directory:
# cat id_rsa.pub >> authorized_keys
# chmod 600 authorized_keys
Log in to winscp with username and password, enter /root/.ssh, there will be three files
Copy the id_rsa file to the local. At this time, the key file cannot be used. It needs to be converted into ppk format.
Re-open winscp without logging in
select 
location id_rsa
Then there will be an id_rsa.ppk file in the same local directory, which is the available key file.
Then you can use the key to log in to the server
Then log in, you can log in successfully without a password.
Second, the java program uses the key to connect to the server (the local is the SpringBoot+gradle project, so it is configured in the application.properties file.)
The tool to be used is the jsch class, and the maven or gradle project only needs to import the corresponding dependencies
Then start writing the connection code
Get the host address and key file in the configuration file
start connection
