Make sure the server is up and listening:
As mentioned earlier, Web servers written in Java usually use ServerSocket to listen on specific ports. For example, server socket server socket = new server socket (8080); ? This line of code binds the server to port 8080. Make sure that the server is running and listening on the port.
Tell others the address and port of the server:
In order for others to connect to your server, you need to tell them the IP address of the server and the port number you are listening to. For example, if your server is running on a local computer and you have a public IP address (or you can forward the port through a router), others can use your public IP address and port number (for example, your_public_ip:8080) to try to connect to your server.
Handle client connections:
On the server side, you need to use the accept () method of ServerSocket to wait for the connection of the client. When the client tries to connect, the accept () method will return a Socket object, which you can use to communicate with the client.
Make sure the network settings allow external connections:
If your server is running in a private network environment, such as a home network or a corporate intranet, you may need to configure a router or firewall to allow external connections. This usually involves port forwarding, that is, forwarding external connections to the internal IP address and port where your server is located.
Handling client requests and responses:
Once the client connects to the server, you can send and receive data through the Socket object. You need to write code to process client requests and generate appropriate responses.
Test connection:
Before telling others the address and port of the server, it is best to test whether the connection is normal by yourself. You can use telnet or other network tools to try to connect to your server and check whether you can successfully establish a connection and send/receive data.