关于GoWeb（1）

朱颜辞镜花辞树‎2025-04-27 14:33

Go Web （1）

一、网络通信与 Socket 编程

（一）Socket 编程基础

Socket 是网络通信的核心，它允许程序之间通过网络进行数据交换。在 Go 中，可以使用标准库 net 来实现 Socket 编程。

（二）Socket 服务端与客户端示例

  1. 服务端代码 ：
go 复制代码 
package main

import (
"net"
"log"
)

func handleConnection(conn net.Conn) {
defer conn.Close()
for {
buf := make([]byte, 1024)
n, err := conn.Read(buf)
if err != nil {
log.Println("Error reading:", err.Error())
return
}
data := buf[:n]
log.Printf("Received: %s", data)
reply := "Server received your message: " + string(data)
conn.Write([]byte(reply))
}
}

func main() {
listener, err := net.Listen("tcp", ":8080")
if err != nil {
log.Fatal("Error starting server:", err)
}
defer listener.Close()
log.Println("Server listening on :8080")

for {
conn, err := listener.Accept()
if err != nil {
log.Println("Error accepting connection:", err.Error())
continue
}
go handleConnection(conn)
}
}
  1. 客户端代码 ：
go 复制代码 
package main

import (
"net"
"log"
)

func main() {
conn, err := net.Dial("tcp", "localhost:8080")
if err != nil {
log.Fatal("Error connecting:", err)
}
defer conn.Close()
log.Println("Connected to server")

message := "Hello from client!"
_, err = conn.Write([]byte(message))
if err != nil {
log.Fatal("Error sending message:", err)
}

buffer := make([]byte, 1024)
n, err := conn.Read(buffer)
if err != nil {
log.Fatal("Error reading response:", err)
}
log.Printf("Server response: %s", buffer[:n])
}

（三）点对点通信

点对点通信是两个网络节点之间的直接通信。通过 Socket 编程，可以实现设备之间的点对点消息传递，常用于即时通讯等场景。

二、MySQL 数据库操作

（一）配置数据库

  1. 安装 MySQL ：在本地或服务器上安装 MySQL 数据库，并创建数据库和表。
  2. Go 中连接 MySQL ：使用 database/sql 包和 mysql 驱动来连接 MySQL。
go 复制代码 
import (
"database/sql"
"fmt"
_ "github.com/go-sql-driver/mysql"
)

func main() {
db, err := sql.Open("mysql", "user:password@tcp(localhost:3306)/dbname")
if err != nil {
panic(err.Error())
}
defer db.Close()

err = db.Ping()
if err != nil {
panic(err.Error())
}
fmt.Println("Connected to database successfully!")
}

（二）数据库增删改查操作

  1. 插入数据 ：
go 复制代码 
func insertData(db *sql.DB) {
sqlStatement := `INSERT INTO users (name, email) VALUES (?, ?)`
_, err := db.Exec(sqlStatement, "John Doe", "[email protected]")
if err != nil {
panic(err.Error())
}
}
  1. 查询数据 ：
go 复制代码 
func queryData(db *sql.DB) {
rows, err := db.Query("SELECT id, name, email FROM users")
if err != nil {
panic(err.Error())
}
defer rows.Close()

for rows.Next() {
var id int
var name, email string
err := rows.Scan(&id, &name, &email)
if err != nil {
panic(err.Error())
}
fmt.Printf("ID: %d, Name: %s, Email: %s\n", id, name, email)
}
}
  1. 更新数据 ：
go 复制代码 
func updateData(db *sql.DB) {
sqlStatement := `UPDATE users SET email = ? WHERE id = ?`
_, err := db.Exec(sqlStatement, "[email protected]", 1)
if err != nil {
panic(err.Error())
}
}
  1. 删除数据 ：
go 复制代码 
func deleteData(db *sql.DB) {
sqlStatement := `DELETE FROM users WHERE id = ?`
_, err := db.Exec(sqlStatement, 1)
if err != nil {
panic(err.Error())
}
}

三、Go Web 开发实例

（一）单控制器实例

go 复制代码 
package main

import (
"net/http"
"fmt"
)

func handler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Hello, World!")
}

func main() {
http.HandleFunc("/", handler)
http.ListenAndServe(":8080", nil)
}

（二）多控制器实例

go 复制代码 
package main

import (
"net/http"
"fmt"
)

func homeHandler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Home Page")
}

func aboutHandler(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "About Page")
}

func main() {
http.HandleFunc("/", homeHandler)
http.HandleFunc("/about", aboutHandler)
http.ListenAndServe(":8080", nil)
}

四、获取请求头和请求参数

（一）获取请求头

go 复制代码 
package main

import (
"net/http"
"fmt"
)

func headerHandler(w http.ResponseWriter, r *http.Request) {
headers := r.Header
fmt.Fprintf(w, "Request Headers:\n")
for key, value := range headers {
fmt.Fprintf(w, "%s: %s\n", key, value)
}
}

func main() {
http.HandleFunc("/headers", headerHandler)
http.ListenAndServe(":8080", nil)
}

（二）获取请求参数

go 复制代码 
package main

import (
"net/http"
"fmt"
)

func paramsHandler(w http.ResponseWriter, r *http.Request) {
name := r.URL.Query().Get("name")
age := r.URL.Query().Get("age")
fmt.Fprintf(w, "Name: %s, Age: %s", name, age)
}

func main() {
http.HandleFunc("/params", paramsHandler)
http.ListenAndServe(":8080", nil)
}

五、Cookie 操作

go 复制代码 
package main

import (
"net/http"
"fmt"
)

func setCookieHandler(w http.ResponseWriter, r *http.Request) {
cookie := http.Cookie{Name: "username", Value: "john_doe", Path: "/"}
http.SetCookie(w, &cookie)
fmt.Fprintf(w, "Cookie set")
}

func main() {
http.HandleFunc("/setcookie", setCookieHandler)
http.ListenAndServe(":8080", nil)
}
go 复制代码 
package main

import (
"net/http"
"fmt"
)

func getCookieHandler(w http.ResponseWriter, r *http.Request) {
cookie, err := r.Cookie("username")
if err != nil {
fmt.Fprintf(w, "Cookie not found")
return
}
fmt.Fprintf(w, "Cookie value: %s", cookie.Value)
}

func main() {
http.HandleFunc("/getcookie", getCookieHandler)
http.ListenAndServe(":8080", nil)
}

六、Restful

使用 Go 框架构建 Restful API

以 Go 的 net/http 包为例，构建一个简单的用户管理 Restful API。

go 复制代码 
package main

import (
"net/http"
"fmt"
"encoding/json"
"strconv"
)

type User struct {
ID   int    `json:"id"`
Name string `json:"name"`
Email string `json:"email"`
}

var users = []User{
{ID: 1, Name: "John Doe", Email: "[email protected]"},
{ID: 2, Name: "Jane Smith", Email: "[email protected]"},
}

func getUsers(w http.ResponseWriter, r *http.Request) {
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(users)
}

func getUser(w http.ResponseWriter, r *http.Request) {
idStr := r.URL.Query().Get("id")
id, err := strconv.Atoi(idStr)
if err != nil {
http.Error(w, "Invalid ID", http.StatusBadRequest)
return
}

for _, user := range users {
if user.ID == id {
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(user)
return
}
}
http.Error(w, "User not found", http.StatusNotFound)
}

func createUser(w http.ResponseWriter, r *http.Request) {
var newUser User
err := json.NewDecoder(r.Body).Decode(&newUser)
if err != nil {
http.Error(w, "Invalid request body", http.StatusBadRequest)
return
}

users = append(users, newUser)
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(newUser)
}

func updateUser(w http.ResponseWriter, r *http.Request) {
idStr := r.URL.Query().Get("id")
id, err := strconv.Atoi(idStr)
if err != nil {
http.Error(w, "Invalid ID", http.StatusBadRequest)
return
}

for i, user := range users {
if user.ID == id {
var updatedUser User
err := json.NewDecoder(r.Body).Decode(&updatedUser)
if err != nil {
http.Error(w, "Invalid request body", http.StatusBadRequest)
return
}
users[i] = updatedUser
w.Header().Set("Content-Type", "application/json")
json.NewEncoder(w).Encode(updatedUser)
return
}
}
http.Error(w, "User not found", http.StatusNotFound)
}

func deleteUser(w http.ResponseWriter, r *http.Request) {
idStr := r.URL.Query().Get("id")
id, err := strconv.Atoi(idStr)
if err != nil {
http.Error(w, "Invalid ID", http.StatusBadRequest)
return
}

	for i, user := range users {
		if user.ID == id {
			users = append(users[:i], users[i+1:]...)
			fmt.Fprintf(w, "User deleted successfully")
			return
		}
	}
	http.Error(w, "User not found", http.StatusNotFound)
}

func main() {
	http.HandleFunc("/users", getUsers)
	http.HandleFunc("/user", getUser)
	http.HandleFunc("/createuser", createUser)
	http.HandleFunc("/updateuser", updateUser)
	http.HandleFunc("/deleteuser", deleteUser)
	http.ListenAndServe(":8080", nil)
}
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