加载依赖文件

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.6.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>4.1.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml-schemas</artifactId>
            <version>4.1.2</version>
        </dependency>

下载文件

    /**
     * 下载文件
     * @throws Exception
     */
    public static void downFile() throws Exception{
        List<User> list = new ArrayList<>();
        list.add(new User("雨院长","yupeng@163.com","测试","地址"));
        list.add(new User("张博士","boshi@163.com","测试","地址"));
        list.add(new User("李教授","jiaoshou@163.com","测试","地址"));
        list.add(new User("徐校长","xiaozhang@163.com","测试","地址"));
        list.add(new User("杨老湿","laoshi@163.com","测试","地址"));

        String url = "/Users/xxx/Desktop/文件管理/";
        File ula = new File(url+"/abc.xlsx");
        if (!ula.exists()){
            ula.createNewFile();
        }
        System.out.println(ula.getPath());
        ExcelWriter writer = ExcelUtil.getWriter();
        writer.renameSheet("急急鹏的故事");  //设置sheet的名称
        writer.addHeaderAlias("name","姓名");
        writer.addHeaderAlias("email","邮箱");
        writer.addHeaderAlias("part","部分");
        writer.addHeaderAlias("ads","地址");
        writer.merge(3,"测试信息");
        CellStyle headCellStyle = writer.getStyleSet().getHeadCellStyle(); // 设置标题样式
        setSheetStyle(headCellStyle,writer);
        writer.write(list,true);
        OutputStream out = new FileOutputStream(ula.getPath());
        writer.flush(out,true);
        writer.close();
        out.close();
        System.out.println("执行结束！");
    }

// 设置表格样式
    /**
     * 添加表格样式
     * @param headCellStyle
     * @param writer
     */
    public static void setSheetStyle(CellStyle headCellStyle,ExcelWriter writer){
        //writer.merge(0, 0, 0, 1,"中心文档", true);  // 设置合并单元格
        headCellStyle.setAlignment(HorizontalAlignment.CENTER);  //水平居中
        headCellStyle.setVerticalAlignment(VerticalAlignment.CENTER);   //垂直居中
        Font font = writer.createFont();  //设置内容字体
        font.setBold(true);  //加粗
        font.setColor((short) 6);  // 颜色设置
        font.setFontHeightInPoints((short)12);  //设置标题字体大小
        headCellStyle.setFont(font);
    }    

// 内部类
class User{
    private String name;
    private String email;
    private String part;
    private String ads;

    public User(String name,String email,String part,String ads){
        this.name = name;
        this.email = email;
        this.part = part;
        this.ads = ads;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPart() {
        return part;
    }

    public void setPart(String part) {
        this.part = part;
    }

    public String getAds() { return ads; }

    public void setAds(String ads) {
        this.ads = ads;
    }
}

上传文件

    /**
     * 上传文件
     * @throws Exception
     */
    public static void updateFile() throws Exception{
        String url = "/Users/xxx/Desktop/文件管理/";
        File ula = new File(url+"/abc.xlsx");
        InputStream fis = new FileInputStream(ula);
        ExcelReader reader = ExcelUtil.getReader(fis);

        // huTool读取excel 1：表示表格头所在行，2：从第几行开始读取，2147483647：行的最大值
        // 因为自定义了表格头别名，所以只能使用map接收，如果没有设置别名，可以使用实体接收
        List<Map<String,Object>> readAll = reader.read(1,2,2147483647);
        // 打印读取的文件信息
        System.out.println(readAll);
        // 数据处理,略...
    }

修改文件名称

    /**
     * 修改文件的名称
     */
    public static void updateFileName() throws Exception{
        String url = "/Users/xxx/Desktop/文件管理/我的文档";
        File file = new File(url);
        File[] files = file.listFiles();
        List<File> filesList = Arrays.asList(files);
        for (File fileNode: filesList) {
            // String fileNameTest = "这是一个视频文件[这是广告信息].mp4";
            String name = fileNode.getName();
            int index = name.indexOf("[");
            if (-1 != index){
                // 截取 "[" 之前的文件名称
                String substring = name.substring(0, index);
                name = substring+".mp4";
                String newName = url + File.separator + name;
                File newFile = new File(newName);
                // 重命名
                fileNode.renameTo(newFile);
            }
        }
    }