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使用模板快速提取excel文件中的数据为数据实体,或者使用模板将数据实体渲染成excel

There is a newer version: 3.18.1-RELEASE

package com.gitee.beiding.template_excel;

import java.io.*;

 class FileUtils {

     static String read(InputStream inputStream) {
        try {
            StringBuilder builder = new StringBuilder();
            String line;
            BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
            while ((line = reader.readLine()) != null) {
                builder.append(line).append("\n");
            }
            reader.close();
            return builder.toString();
        } catch (Exception e) {
            return null;
        }
    }

     static String read(File file) {
        try {
            return read(new FileInputStream(file));
        } catch (Exception e) {
            return null;
        }
    }

     static void copy(InputStream inputStream, OutputStream outputStream) throws IOException {
        byte[] buff = new byte[1024];
        int len;
        while ((len = inputStream.read(buff)) != -1) {
            outputStream.write(buff, 0, len);
        }
    }

     static void copy(File src, File target) throws IOException {
        FileInputStream inputStream = new FileInputStream(src);
        FileOutputStream outputStream = new FileOutputStream(target);
        copy(inputStream, outputStream);
        inputStream.close();
        outputStream.close();
    }

}