feat(upload): 实现文件上传功能

- 添加处理 multipart 表单的 Go 函数
- 创建用于文件上传的 HTML 表单页面
- 支持解析和显示上传文件的元数据- 实现多文件上传处理逻辑
- 添加城市和姓名的文本文件示例- 集成 Bootstrap 样式提升界面美观度

24-httpserver/httpserver/upload.go

@@ -0,0 +1,51 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+)
+
+func HandleMultipartForm(writer http.ResponseWriter, request *http.Request) {
+	fmt.Fprintf(writer, "Name: %v , City : %v \n", request.FormValue("name"), request.FormValue("city"))
+	fmt.Fprintln(writer, "--------")
+
+	file, header, err := request.FormFile("files")
+	if err != nil {
+		http.Error(writer, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	defer file.Close()
+	fmt.Fprintf(writer, "File Name: %v, File Size: %v \n", header.Filename, header.Size)
+	for k, v := range header.Header {
+		fmt.Fprintf(writer, "Key: %v , Value: %v \n", k, v)
+	}
+	fmt.Fprintln(writer, "--------")
+	io.Copy(writer, file)
+}
+
+func HandleMultipartForm2(writer http.ResponseWriter, request *http.Request) {
+	request.ParseMultipartForm(10 * 1024 * 1024)
+	fmt.Fprintf(writer, "Name: %v , City : %v \n", request.FormValue("name"), request.FormValue("city"))
+	fmt.Fprintln(writer, "--------\n")
+
+	for _, header := range request.MultipartForm.File["files"] {
+		fmt.Fprintf(writer, "\n\n--------\nFile Name: %v, File Size: %v \n", header.Filename, header.Size)
+		file, err := header.Open()
+		if err != nil {
+			http.Error(writer, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		defer file.Close()
+		for k, v := range header.Header {
+			fmt.Fprintf(writer, "Key: %v , Value: %v \n", k, v)
+		}
+		fmt.Fprintln(writer, "--------")
+		io.Copy(writer, file)
+	}
+
+}
+
+func init() {
+	http.HandleFunc("/forms/upload", HandleMultipartForm2)
+}