feat: 完成了 file list 右键简单菜单

feat: 完成了 file 下载
todo: 桶右键菜单和删除桶

frontend/src/component/connection/list.tsx

@@ -9,9 +9,15 @@ import {
     tokens,
     Tooltip
 } from "@fluentui/react-components"
-import {DatabaseLinkRegular, DismissRegular} from "@fluentui/react-icons";
+import {
-import React, { useEffect,  useState} from "react";
+    DatabaseLinkRegular,
-import { Connection} from "../../interfaces/connection";
+    DeleteRegular,
+    DismissRegular,
+    PlugConnectedRegular, PlugDisconnectedRegular,
+    SettingsRegular
+} from "@fluentui/react-icons";
+import React, {useEffect, useState} from "react";
+import {Connection} from "../../interfaces/connection";
 import {useToast} from "../../message";
 import {Dial} from "../../api";
 import {useStoreConnection} from "../../store/connection";
@@ -92,13 +98,15 @@ export function ConnectionList() {
         y: number,
         display: 'none' | 'block'
     }>({x: 0, y: 0, display: 'none'});
+    const [menu_conn, set_menu_conn] = useState<Connection | null>(null);
 
     useEffect(() => {
         document.addEventListener("click", (e) => {
             set_ctx_menu({x: 0, y: 0, display: 'none'});
         })
         return () => {
-            document.removeEventListener("click", (e) => {})
+            document.removeEventListener("click", (e) => {
+            })
         }
     }, [])
 
@@ -112,7 +120,8 @@ export function ConnectionList() {
         })
     }
 
-    async function handleConnect(item: Connection) {
+    async function handleConnect(item: Connection | null) {
+        if (!item) return;
         let res = await Dial('/api/connection/connect', {id: item.id});
         if (res.status !== 200) {
             dispatchMessage(res.msg, "error")
@@ -124,7 +133,8 @@ export function ConnectionList() {
         bucket_set(null)
     }
 
-    async function handleDisconnect(item: Connection) {
+    async function handleDisconnect(item: Connection | null) {
+        if (!item) return;
         let res = await Dial('/api/connection/disconnect', {id: item.id})
         if (res.status !== 200) {
             dispatchMessage(res.msg, "error")
@@ -135,11 +145,17 @@ export function ConnectionList() {
 
     async function handleRightClick(e: React.MouseEvent<HTMLDivElement>, item: Connection) {
         e.preventDefault()
-        console.log('[DEBUG] right click connection =', item, 'event =', e)
+        set_menu_conn(item)
-        console.log(`[DEBUG] click position: [${e.pageX}, ${e.pageY}]`)
+
+        const ele = document.querySelector('#list-connection-container')
+        const eleX = ele ? ele.clientWidth : 0
+        const eleY = ele ? ele.clientHeight : 0
+        const positionX = (e.pageX + eleX > window.innerWidth) ? e.pageX - eleX : e.pageX
+        const positionY = (e.pageY + eleY > window.innerHeight) ? e.pageY - eleY : e.pageY
+
         set_ctx_menu({
-            x: e.pageX,
+            x: positionX,
-            y: e.pageY,
+            y: positionY,
             display: 'block',
         })
     }
@@ -160,13 +176,24 @@ export function ConnectionList() {
                         onChange={(e) => set_conn_filter(e.target.value)}
                     />
                 </div>
-                <div className={styles.ctx_menu}
+                <div
+                    id={'list-connection-container'}
+                    className={styles.ctx_menu}
                     style={{left: ctx_menu.x, top: ctx_menu.y, display: ctx_menu.display}}
                 >
                     <MenuList>
-                        <MenuItem>连接</MenuItem>
+                        <MenuItem
-                        <MenuItem>设置</MenuItem>
+                            onClick={async () => {
-                        <MenuItem>删除</MenuItem>
+                                await handleConnect(menu_conn)
+                            }}
+                            icon={<PlugConnectedRegular/>}>连接</MenuItem>
+                        <MenuItem
+                            onClick={async () => {
+                                await handleDisconnect(menu_conn)
+                            }}
+                            icon={<PlugDisconnectedRegular/>}>断开</MenuItem>
+                        <MenuItem icon={<SettingsRegular/>}>设置</MenuItem>
+                        <MenuItem icon={<DeleteRegular/>}>删除</MenuItem>
                     </MenuList>
                 </div>
                 <div className={styles.items}>
@@ -186,18 +213,6 @@ export function ConnectionList() {
                                 icon={<DatabaseLinkRegular/>}
                                 key={item.id}>
                                 {item.name}
-                                <Tooltip
-                                    content="断开连接"
-                                    relationship="label">
-                                    <Button
-                                        appearance={'transparent'}
-                                        size="small"
-                                        icon={<DismissRegular/>}
-                                        className={styles.items_disconn}
-                                        onClick={async () => {
-                                            await handleDisconnect(item)
-                                        }}/>
-                                </Tooltip>
                             </MenuItem>
                         })}
                     </MenuList>

frontend/src/component/file/list_file.tsx

@@ -1,18 +1,28 @@
 import {makeStyles, MenuItem, MenuList, Text, tokens} from "@fluentui/react-components";
 import {
-
+    ArrowDownloadFilled,
-    DocumentBulletListRegular, DocumentChevronDoubleRegular, DocumentCssRegular, DocumentDatabaseRegular,
+    DeleteRegular,
+    DocumentBulletListRegular,
+    DocumentChevronDoubleRegular,
+    DocumentCssRegular,
+    DocumentDatabaseRegular,
     DocumentDismissRegular,
-    DocumentImageRegular, DocumentJavascriptRegular, DocumentPdfRegular, DocumentYmlRegular,
+    DocumentImageRegular,
-    FolderRegular
+    DocumentJavascriptRegular,
+    DocumentPdfRegular,
+    DocumentYmlRegular,
+    FolderRegular,
+    PreviewLinkRegular
 } from "@fluentui/react-icons";
 import {VirtualizerScrollView} from "@fluentui/react-components/unstable";
-import React from "react";
+import React, {useEffect, useState} from "react";
 import {useStoreBucket} from "../../store/bucket";
-import { S3File} from "../../interfaces/connection";
+import {S3File} from "../../interfaces/connection";
 import {useStoreFile} from "../../store/file";
 import {useStoreConnection} from "../../store/connection";
 import {TrimSuffix} from "../../hook/strings";
+import {Dial} from "../../api";
+import {useToast} from "../../message";
 
 const useStyles = makeStyles({
     container: {
@@ -49,14 +59,39 @@ const useStyles = makeStyles({
         fontSize: '8rem',
         flexDirection: 'column',
     },
+    ctx_menu: {
+        position: "absolute",
+        zIndex: "1000",
+        width: "15rem",
+        backgroundColor: tokens.colorNeutralBackground1,
+        boxShadow: `${tokens.shadow16}`,
+        paddingTop: "4px",
+        paddingBottom: "4px",
+    },
 })
 
 export function ListFileComponent() {
 
     const styles = useStyles();
+    const {dispatchMessage} = useToast();
     const {conn_active} = useStoreConnection();
     const {bucket_active} = useStoreBucket()
-    const {files_get, files_list} = useStoreFile()
+    const {file_active, files_get, file_set, files_list} = useStoreFile()
+    const [ctx_menu, set_ctx_menu] = useState<{
+        x: number,
+        y: number,
+        display: 'none' | 'block'
+    }>({x: 0, y: 0, display: 'none'});
+
+    useEffect(() => {
+        document.addEventListener("click", (e) => {
+            set_ctx_menu({x: 0, y: 0, display: 'none'});
+        })
+        return () => {
+            document.removeEventListener("click", (e) => {
+            })
+        }
+    }, [])
 
     const filename = (key: string) => {
         let strs = TrimSuffix(key, "/").split("/")
@@ -70,11 +105,64 @@ export function ListFileComponent() {
         }
     }
 
-    function handleRightClick(e: React.MouseEvent<HTMLDivElement>, item: S3File) {
+    async function handleRightClick(e: React.MouseEvent<HTMLDivElement>, item: S3File) {
         e.preventDefault()
+        await file_set(item.key)
+        const ele = document.querySelector('#list-file-container')
+        const eleX = ele ? ele.clientWidth : 0
+        const eleY = ele ? ele.clientHeight : 0
+        const positionX = (e.pageX + eleX > window.innerWidth) ? e.pageX - eleX : e.pageX
+        const positionY = (e.pageY + eleY > window.innerHeight) ? e.pageY - eleY : e.pageY
+        set_ctx_menu({
+            x: positionX,
+            y: positionY,
+            display: 'block',
+        })
+        // const res = await Dial('/api/file/info', {conn_id: conn_active?.id, bucket: bucket_active?.name, key: item.key})
     }
 
-    return <MenuList className={styles.container}>
+    async function handleDownload(file: string | null) {
+        if (!file) return
+        const res1 = await Dial<{result:string}>("/runtime/dialog/save", {
+            default_filename: file,
+        })
+        if (res1.status !== 200) {
+            return
+        }
+        if (!res1.data) return
+        const res2 = await Dial('/api/file/download', {
+            conn_id: conn_active?.id,
+            bucket: bucket_active?.name,
+            key: file,
+            location: res1.data.result,
+        })
+        if (res2.status === 200) {
+            dispatchMessage('保存文件成功', 'success')
+        }
+    }
+
+    return <>
+        <div
+            id={'list-file-container'}
+            className={styles.ctx_menu}
+            style={{left: ctx_menu.x, top: ctx_menu.y, display: ctx_menu.display}}
+        >
+            <MenuList>
+                <MenuItem
+                    onClick={async () => {
+                        await handleDownload(file_active)
+                    }}
+                    icon={<ArrowDownloadFilled/>}>下载</MenuItem>
+                <MenuItem
+                    disabled
+                    onClick={async () => {
+                        // await handleDisconnect(menu_conn)
+                    }}
+                    icon={<PreviewLinkRegular/>}>预览</MenuItem>
+                <MenuItem icon={<DeleteRegular/>}>删除</MenuItem>
+            </MenuList>
+        </div>
+        <MenuList className={styles.container}>
             {files_list.length ?
                 <VirtualizerScrollView
                     numItems={files_list.length}
@@ -88,7 +176,7 @@ export function ListFileComponent() {
                                 await handleClick(files_list[idx])
                             }}
                             onContextMenu={async (e) => {
-                            handleRightClick(e, files_list[idx])
+                                await handleRightClick(e, files_list[idx])
                             }}>
                             <MenuItem className={styles.item}
                                       icon={files_list[idx].type ? <FolderRegular/> :
@@ -109,6 +197,7 @@ export function ListFileComponent() {
                 </div>
             }
         </MenuList>
+    </>
 }
 
 type FileIconProps = {
@@ -136,7 +225,7 @@ function FileIcon(props: FileIconProps) {
         case "pdf":
             return <DocumentPdfRegular/>
         case "css":
-            return <DocumentCssRegular />
+            return <DocumentCssRegular/>
         case "js":
             return <DocumentJavascriptRegular/>
         case "yaml":

frontend/src/component/file/path.tsx

@@ -66,7 +66,7 @@ export function Path() {
         }
 
         bucket_get(conn_active!, false)
-        bucket_set(null)
+        await bucket_set(null)
     }
 
 

frontend/src/component/preview/preview.tsx

@@ -0,0 +1,3 @@
+export function PreviewFile() {
+
+}

frontend/src/store/bucket.tsx

@@ -4,7 +4,7 @@ import {Dial, Resp} from "../api";
 
 interface StoreBucket {
     bucket_active: Bucket | null;
-    bucket_set: (Bucket: Bucket | null) => void;
+    bucket_set: (Bucket: Bucket | null) => Promise<void>;
     bucket_list: Bucket[];
     bucket_get: (conn: Connection, refresh: boolean) => void;
     bucket_create: (conn: Connection, name: string, public_read: boolean, public_read_write: boolean) => void;

frontend/src/store/connection.tsx

@@ -6,7 +6,7 @@ interface StoreConnection {
     conn_active: Connection | null;
     conn_list: Connection[];
     conn_get: () => void;
-    conn_update: (connection: Connection) => void;
+    conn_update: (connection: Connection) => Promise<void>;
 }
 
 export const useStoreConnection = create<StoreConnection>()((set) => ({

frontend/src/store/file.tsx

@@ -3,13 +3,23 @@ import {Bucket, Connection, S3File} from "../interfaces/connection";
 import {Dial} from "../api";
 
 interface StoreFile {
+    file_active: string | null,
+    file_set: (key: string) => Promise<void>,
     prefix: string;
+    filter: string;
     files_list: S3File[];
     files_get: (conn: Connection, bucket: Bucket, prefix?: string, filter?: string) => void;
 }
 
 export const useStoreFile = create<StoreFile>()((set) => ({
+    file_active: null,
+    file_set: async (key: string) => {
+        set((state) => {
+            return {file_active: key}
+        })
+    },
     prefix: "",
+    filter: "",
     files_list: [],
     files_get: async (conn: Connection, bucket: Bucket, prefix = '', filter = '') => {
         const res = await Dial<{ list: S3File[] }>('/api/bucket/files', {
@@ -23,7 +33,7 @@ export const useStoreFile = create<StoreFile>()((set) => ({
         }
 
         set((state) => {
-            return {files_list: res.data.list, prefix: prefix}
+            return {files_list: res.data.list, prefix: prefix, filter: filter}
         })
     }
 }))

frontend/src/store/preview.tsx

@@ -0,0 +1,18 @@
+import {create} from 'zustand'
+import {Bucket, Connection} from "../interfaces/connection";
+
+interface StorePreview {
+    preview_key: string;
+    preview_url: string;
+    preview_content_type: string;
+    preview_set: (key: string) => void;
+}
+
+export const useStorePreview = create<StorePreview>()((set) => ({
+    preview_key: '',
+    preview_url: '',
+    preview_content_type: '',
+    preview_set: async (key: string) => set(state => {
+        return {preview_key: key}
+    }),
+}))

go.mod

@@ -10,6 +10,7 @@ require (
 	github.com/aws/aws-sdk-go-v2/credentials v1.17.36
 	github.com/aws/aws-sdk-go-v2/service/s3 v1.63.2
 	github.com/aws/smithy-go v1.21.0
+	github.com/labstack/gommon v0.4.0
 	github.com/loveuer/go-sqlite3 v1.0.2
 	github.com/loveuer/nf v0.2.11
 	github.com/ncruces/go-sqlite3/gormlite v0.18.4
@@ -49,7 +50,6 @@ require (
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
 	github.com/labstack/echo/v4 v4.10.2 // indirect
-	github.com/labstack/gommon v0.4.0 // indirect
 	github.com/leaanthony/go-ansi-parser v1.6.0 // indirect
 	github.com/leaanthony/gosod v1.0.3 // indirect
 	github.com/leaanthony/slicer v1.6.0 // indirect

internal/api/api.go

@@ -25,6 +25,7 @@ func Resolve(path string) (ndh.Handler, bool) {
 
 func Init(ctx context.Context) error {
 	register("/runtime/dialog/open", handler.DialogOpen(ctx))
+	register("/runtime/dialog/save", handler.DialogSave(ctx))
 	register("/api/connection/test", handler.ConnectionTest)
 	register("/api/connection/create", handler.ConnectionCreate)
 	register("/api/connection/list", handler.ConnectionList)
@@ -34,6 +35,9 @@ func Init(ctx context.Context) error {
 	register("/api/bucket/files", handler.BucketFiles)
 	register("/api/bucket/create", handler.BucketCreate)
 	register("/api/file/upload", handler.FileUpload)
+	register("/api/file/info", handler.FileInfo)
+	register("/api/file/get", handler.FileGet)
+	register("/api/file/download", handler.FileDownload)
 
 	return nil
 }

internal/handler/dialog.go

@@ -5,6 +5,8 @@ import (
 	"github.com/loveuer/nf-disk/ndh"
 	"github.com/samber/lo"
 	"github.com/wailsapp/wails/v2/pkg/runtime"
+	"os"
+	"path/filepath"
 )
 
 func DialogOpen(ctx context.Context) ndh.Handler {
@@ -54,3 +56,58 @@ func DialogOpen(ctx context.Context) ndh.Handler {
 		return c.Send200(map[string]interface{}{"result": result})
 	}
 }
+
+func DialogSave(ctx context.Context) ndh.Handler {
+	return func(c *ndh.Ctx) error {
+		type Req struct {
+			Title            string   `json:"title"`
+			Filters          []string `json:"filters"`
+			DefaultDirectory string   `json:"default_directory"`
+			DefaultFilename  string   `json:"default_filename"`
+		}
+
+		var (
+			err error
+			req = new(Req)
+			opt = runtime.SaveDialogOptions{
+				Title: "将文件保存到",
+			}
+			result any
+		)
+
+		if err = c.ReqParse(req); err != nil {
+			return c.Send400(err.Error())
+		}
+
+		if req.Title != "" {
+			opt.Title = req.Title
+		}
+
+		if req.DefaultFilename != "" {
+			opt.DefaultFilename = req.DefaultFilename
+		}
+
+		if req.DefaultDirectory != "" {
+			opt.DefaultDirectory = req.DefaultDirectory
+		}
+
+		if opt.DefaultDirectory == "" {
+			var home string
+			if home, err = os.UserHomeDir(); err != nil {
+				opt.DefaultDirectory = filepath.Join(home, "Downloads")
+			}
+		}
+
+		if len(req.Filters) > 0 {
+			opt.Filters = lo.Map(req.Filters, func(item string, index int) runtime.FileFilter {
+				return runtime.FileFilter{Pattern: item}
+			})
+		}
+
+		if result, err = runtime.SaveFileDialog(ctx, opt); err != nil {
+			return c.Send500(err.Error())
+		}
+
+		return c.Send200(map[string]interface{}{"result": result})
+	}
+}

internal/handler/file.go

@@ -86,3 +86,100 @@ func FileUpload(c *ndh.Ctx) error {
 
 	return c.Send200(req)
 }
+
+func FileInfo(c *ndh.Ctx) error {
+	type Req struct {
+		ConnId uint64 `json:"conn_id"`
+		Bucket string `json:"bucket"`
+		Key    string `json:"key"`
+	}
+
+	var (
+		err    error
+		req    = new(Req)
+		client *s3.Client
+		info   *s3.ObjectInfo
+	)
+
+	if err = c.ReqParse(req); err != nil {
+		return c.Send400(err.Error())
+	}
+
+	if _, client, err = manager.Manager.Use(req.ConnId); err != nil {
+		return c.Send500(err.Error())
+	}
+
+	if info, err = client.GetObjectInfo(c.Context(), req.Bucket, req.Key); err != nil {
+		return c.Send500(err.Error())
+	}
+
+	return c.Send200(info)
+}
+
+func FileGet(c *ndh.Ctx) error {
+	type Req struct {
+		ConnId uint64 `json:"conn_id"`
+		Bucket string `json:"bucket"`
+		Key    string `json:"key"`
+	}
+
+	var (
+		err    error
+		req    = new(Req)
+		client *s3.Client
+		link   *s3.ObjectEntry
+	)
+
+	if err = c.ReqParse(req); err != nil {
+		return c.Send400(err.Error())
+	}
+
+	if _, client, err = manager.Manager.Use(req.ConnId); err != nil {
+		return c.Send500(err.Error())
+	}
+
+	if link, err = client.GetObjectEntry(c.Context(), req.Bucket, req.Key); err != nil {
+		return c.Send500(err.Error())
+	}
+
+	return c.Send200(link)
+}
+
+func FileDownload(c *ndh.Ctx) error {
+	type Req struct {
+		ConnId   uint64 `json:"conn_id"`
+		Bucket   string `json:"bucket"`
+		Key      string `json:"key"`
+		Location string `json:"location"`
+	}
+
+	var (
+		err    error
+		req    = new(Req)
+		client *s3.Client
+		obj    *s3.ObjectEntity
+		target *os.File
+	)
+
+	if err = c.ReqParse(req); err != nil {
+		return c.Send400(err.Error())
+	}
+
+	if _, client, err = manager.Manager.Use(req.ConnId); err != nil {
+		return c.Send500(err.Error())
+	}
+
+	if obj, err = client.GetObject(c.Context(), req.Bucket, req.Key); err != nil {
+		return c.Send500(err.Error())
+	}
+
+	if target, err = os.OpenFile(filepath.Clean(req.Location), os.O_CREATE|os.O_RDWR|os.O_TRUNC, 0644); err != nil {
+		return c.Send500(err.Error())
+	}
+
+	if _, err = io.Copy(target, obj.Body); err != nil {
+		return c.Send500(err.Error())
+	}
+
+	return c.Send200(req)
+}

internal/s3/get.go

@@ -0,0 +1,121 @@
+package s3
+
+import (
+	"context"
+	"github.com/aws/aws-sdk-go-v2/aws"
+	v4 "github.com/aws/aws-sdk-go-v2/aws/signer/v4"
+	"github.com/aws/aws-sdk-go-v2/service/s3"
+	"github.com/labstack/gommon/log"
+	"io"
+	"net/http"
+	"time"
+)
+
+type ObjectInfo struct {
+	Bucket      string
+	Key         string
+	ContentType string
+	Expire      int64
+}
+
+func (c *Client) GetObjectInfo(ctx context.Context, bucket string, key string) (*ObjectInfo, error) {
+	var (
+		err   error
+		input = &s3.HeadObjectInput{
+			Bucket: aws.String(bucket),
+			Key:    aws.String(key),
+		}
+		output *s3.HeadObjectOutput
+	)
+
+	if output, err = c.client.HeadObject(ctx, input); err != nil {
+		return nil, err
+	}
+
+	return &ObjectInfo{
+		Bucket:      bucket,
+		Key:         key,
+		ContentType: aws.ToString(output.ContentType),
+		Expire:      aws.ToTime(output.Expires).UnixMilli(),
+	}, nil
+}
+
+// GetObject
+// https://docs.aws.amazon.com/AmazonS3/latest/userguide/example_s3_Scenario_PresignedUrl_section.html
+
+type Presigner struct {
+	PresignClient *s3.PresignClient
+}
+
+func (presigner *Presigner) GetObject(ctx context.Context, bucketName string, objectKey string, lifetimeSecs int64) (*v4.PresignedHTTPRequest, error) {
+	request, err := presigner.PresignClient.PresignGetObject(ctx, &s3.GetObjectInput{
+		Bucket: aws.String(bucketName),
+		Key:    aws.String(objectKey),
+	}, func(opts *s3.PresignOptions) {
+		opts.Expires = time.Duration(lifetimeSecs * int64(time.Second))
+	})
+	if err != nil {
+		log.Error("Presigner: couldn't get a presigned request to get %v:%v. Here's why: %v\n",
+			bucketName, objectKey, err)
+	}
+	return request, err
+}
+
+type ObjectEntry struct {
+	URL    string
+	Method string
+	Header http.Header
+}
+
+func (c *Client) GetObjectEntry(ctx context.Context, bucket string, key string, lifetimes ...int64) (*ObjectEntry, error) {
+	var (
+		err      error
+		lifetime int64 = 5 * 60
+		pc             = &Presigner{PresignClient: s3.NewPresignClient(c.client)}
+		output   *v4.PresignedHTTPRequest
+	)
+
+	if len(lifetimes) > 0 && lifetimes[0] > 0 {
+		lifetime = lifetimes[0]
+	}
+
+	if output, err = pc.GetObject(ctx, bucket, key, lifetime); err != nil {
+		return nil, err
+	}
+
+	return &ObjectEntry{
+		URL:    output.URL,
+		Method: output.Method,
+		Header: output.SignedHeader,
+	}, nil
+}
+
+type ObjectEntity struct {
+	ObjectInfo
+	Body io.ReadCloser
+}
+
+func (c *Client) GetObject(ctx context.Context, bucket string, key string) (*ObjectEntity, error) {
+	var (
+		err   error
+		input = &s3.GetObjectInput{
+			Bucket: aws.String(bucket),
+			Key:    aws.String(key),
+		}
+		output *s3.GetObjectOutput
+	)
+
+	if output, err = c.client.GetObject(ctx, input); err != nil {
+		return nil, err
+	}
+
+	return &ObjectEntity{
+		ObjectInfo: ObjectInfo{
+			Bucket:      bucket,
+			Key:         key,
+			ContentType: aws.ToString(output.ContentType),
+			Expire:      aws.ToTime(output.Expires).UnixMilli(),
+		},
+		Body: output.Body,
+	}, nil
+}

xtest/path.js

@@ -1,10 +0,0 @@
-function getBaseFileName(fullPath) {
-    return fullPath.replace(/.*[\/\\]/, '');
-}
-
-// 测试
-const filePath = 'C:\\Users\\username\\Documents\\example.txt';
-console.log(getBaseFileName(filePath));  // 输出: example.txt
-
-const filePath2 = '/home/user/documents/example.txt';
-console.log(getBaseFileName(filePath2));  // 输出: example.txt