Java list集合转存Excel ExcelUtil工具类案例

 话不多说，先上工具类。里面的逻辑是将读到的数据转存list再进行插入excel、如果是读数据库 也可以将里面的逻辑改成遍历实体类。道理是一样的。

public class ExcelUtil {

    
    public static boolean DataToExcel(String excelName,String excelPath, String sheet, int rowNum, List titleName,
                                      List data, int num) throws IOException{

        boolean flag = false;
        WritableWorkbook wwb = null;
        try {

            File file1 = new File(excelPath);
            if (!file1.exists()) {
                file1.mkdir();
            }
            File file = new File(file1, excelName);
            if (!file.exists()) {
                file.createNewFile();
            }

            //以fileName为文件名来创建一个Workbook
            wwb = Workbook.createWorkbook(file);
            // 创建工作表sheet
            WritableSheet ws = wwb.createSheet(sheet, 0);
            //要插入到的Excel表格的行号，默认从0开始
            for (int i = 0; i < rowNum; i++) {
                Label label = new Label(i, 0, titleName.get(i));
                ws.addCell(label);
            }
                for (int i = 0; i < data.size(); i++) {
                    for (int j = 0; j < num; j++) {
                        ws.addCell(new Label(j, i + 1, data.get(i).split(",")[j]));
                    }
                }
            wwb.write();
            flag = true;
            // 关闭Excel工作簿对象
            wwb.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return flag;
    }
}

测试：我说读本地文件，进行测试

public class testDownExcel {
    public static void main(String[] args) throws Exception {
        List titleName = new ArrayList();
        titleName.add("编码");
        titleName.add("名称");
        titleName.add("简码");
        titleName.add("税号");
        titleName.add("地址电话");
        titleName.add("银行账号");
        titleName.add("邮件地址");
        titleName.add("备注");
        titleName.add("身份证校验");
        List list = ExcelUtil.readTxtFileToList("C:\Users\86187\Desktop\xxx客户编码.txt");
        String excelPath = "D:\test\record";
        boolean sheet1 = ExcelUtil.DataToExcel("kf.xls", excelPath, "sheet1", 9, titleName, list, 9);

         if (sheet1 == true){
            System.out.println("excel生成成功！！！");
        }else {
            System.out.println("excel生成失败！！！");
        }
    }
}

读取本地文件的方法

public static List readTxtFileToList(String filePath) {
        //存放内容的map对象
        List strings = new ArrayList<>();
        try {
            String encoding = "GBK";
            File file = new File(filePath);
            int count = 0;//定义顺序变量
            if (file.isFile() && file.exists()) { // 判断文件是否存在
                InputStreamReader read = new InputStreamReader(new FileInputStream(file), encoding);// 考虑到编码格式
                BufferedReader bufferedReader = new BufferedReader(read);
                String lineTxt = null;
                while ((lineTxt = bufferedReader.readLine()) != null) {//按行读取
                    if (!"".equals(lineTxt)) {
                        strings.add(lineTxt);//放入list
                        count++;
                    }
                }
//                System.out.println("count:"+count);
                read.close();//关闭InputStreamReader
                bufferedReader.close();//关闭BufferedReader
            } else {
                System.out.println("找不到指定的文件");
            }
        } catch (Exception e) {
            System.out.println("读取文件内容出错");
            e.printStackTrace();
        }
        return strings;
    }

 完成！！