fix issue in zip feature for package gcompress; improve package gres

.example/encoding/gcompress/zip.go

@@ -1,15 +1,68 @@
 package main
 
 import (
+	"archive/zip"
 	"fmt"
-
 	"github.com/gogf/gf/encoding/gcompress"
+	"io"
+	"os"
+	"path/filepath"
+	"strings"
 )
 
-func main() {
-	err := gcompress.ZipPath(
-		`/Users/john/Workspace/Go/GOPATH/src/github.com/gogf/gf/test`,
-		`/Users/john/Workspace/Go/GOPATH/src/github.com/gogf/gf/test.zip`,
-	)
-	fmt.Println(err)
+// srcFile could be a single file or a directory
+func Zip(srcFile string, destZip string) error {
+	zipfile, err := os.Create(destZip)
+	if err != nil {
+		return err
+	}
+	defer zipfile.Close()
+
+	archive := zip.NewWriter(zipfile)
+	defer archive.Close()
+
+	filepath.Walk(srcFile, func(path string, info os.FileInfo, err error) error {
+		if err != nil {
+			return err
+		}
+
+		header, err := zip.FileInfoHeader(info)
+		if err != nil {
+			return err
+		}
+
+		header.Name = strings.TrimPrefix(path, filepath.Dir(srcFile)+"/")
+		// header.Name = path
+		if info.IsDir() {
+			header.Name += "/"
+		} else {
+			header.Method = zip.Deflate
+		}
+
+		writer, err := archive.CreateHeader(header)
+		if err != nil {
+			return err
+		}
+
+		if !info.IsDir() {
+			file, err := os.Open(path)
+			if err != nil {
+				return err
+			}
+			defer file.Close()
+			_, err = io.Copy(writer, file)
+		}
+		return err
+	})
+
+	return err
+}
+
+func main() {
+	src := `/Users/john/Workspace/Go/GOPATH/src/github.com/gogf/gf/test`
+	dst := `/Users/john/Workspace/Go/GOPATH/src/github.com/gogf/gf/test.zip`
+	//src := `/Users/john/Workspace/Go/GOPATH/src/github.com/gogf/gf/README.MD`
+	//dst := `/Users/john/Workspace/Go/GOPATH/src/github.com/gogf/gf/README.MD.zip`
+	fmt.Println(gcompress.ZipPath(src, dst))
+	//fmt.Println(Zip(src, dst))
 }