Communication Protocol Monitoring in liunx

Tcpdump is a powerful protocol layer analysis tool in linux. It can be used to monitor network communication and locate network-related bugs. For example: whether a connection is created between the client and the server, the client sends a message, the server does not parse it, or the client does not send a message at all .... For example, I want to monitor the communication content of the same ip address. Java code tcpdump host ip_X-xx or the communication Java code tcpdump port YY-xx for the specified port, or monitoring http protocol Java code tcpdump-A port YY the use of tcpflow is similar to that of tcpdump, tcpflow only outputs the monitored messages by file.