Java socket file transfer example code

Recently, I became addicted to learning socket, so I wrote a simple file transfer program.

Client design idea: the client establishes a connection with the server, selects the local file of the client, first sends the file name, size and other attributes to the server, and then transmits the file to the server through streaming. The progress of the transfer is printed to the console until the transfer is complete.

Design idea of the server: the server receives the client's request (blocking type). After receiving a client's request to connect, it opens a new thread to process the file, starts writing the stream, and sends the file to the specified directory of the server with the same name as the transmitted file. The following is the code implementation of the client and server:

Client code:

Server code:

Test results (client):

Test results (server side):

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