golang close socket

Golang is a relatively new programming language that makes it easy to create high-performance and scalable web applications. For network programming, Golang provides a built-in TCP library that makes writing network applications easier. When developing network applications, occasionally we need to close a socket connection in order to terminate the communication between the server and the client. This article will introduce how to close socket connection in Golang.

1. Create a socket connection

In Golang, we can use the net package in the standard library to create a socket connection. When using a TCP connection, we can use the Dial function to establish a connection:

conn, err := net.Dial("tcp", "localhost:8080")
if err != nil {
    log.Fatal(err)
}

// 使用连接进行通信
// ...

// 关闭socket连接
conn.Close()

In this code, we use the Dial function to establish a TCP connection with port number 8080 on the local host. Calling this function will return a connection object conn and possible errors. After we use the conn object to communicate, we need to close its connection with the server in time to release resources and terminate communication.

2. Close a socket connection on the server side

On the server side, when we need to terminate communication with the client, we need to close the created socket connection. We can use the built-in net package and os package of the Go language to obtain the handle of the socket connection, and then use the Close method provided in the os package to close the connection. For example:

// 监听端口并接受客户端连接
listener, err := net.Listen("tcp", ":8080")
if err != nil {
    log.Fatal(err)
}

for {
    // 接受客户端连接
    conn, err := listener.Accept()
    if err != nil {
        log.Fatal(err)
    }

    // 使用连接进行通信
    // ...

    // 关闭连接
    conn.(*net.TCPConn).Close()
}

In this code, we use the Listen function in the net package to listen to the port, and use the Accept function to accept connections initiated from the client. After communicating using the connection, we use pointer type conversion to convert the conn object to *net.TCPConn type and close the connection using the Close method.

3. Close a socket connection on the client side

On the client side, we can close the connection with the server by calling the Close method of the connection object. For example:

conn, err := net.Dial("tcp", "localhost:8080")
if err != nil {
    log.Fatal(err)
}

// 使用连接进行通信
// ...

// 关闭连接
conn.Close()

In this code, we use the Dial function to establish a TCP connection with port number 8080 on the local host, and use the Close method to close the connection after completing the communication. Note that this code only works if the connection is closed on the client side, not if the connection is closed on the server side.

Summary

In Golang, we can use the net package in the standard library to create a socket connection, use the Dial function to create a connection for the client, and use the Listen function to create a connection for the server. We can close the connection using the Close method of the connection object. This is an efficient way to release resources and terminate communication, so should be kept in mind when developing web applications.

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