java 使用反射将数据写入Excel

;
        file.createNewFile();
        OutputStream os = new FileOutputStream(file);
        WritableWorkbook wwb = Workbook.createWorkbook(os);
        WritableSheet writableSheet = wwb.createSheet(sheetName, 0);

        int rowIndex = 0;
        int colIndex = 0;
        Iterator iterator = colMap.entrySet().iterator();
        List<String> colList = new ArrayList<>();

        while (iterator.hasNext()) {
            Map.Entry entry = (Map.Entry) iterator.next();
            colList.add(entry.getValue().toString());

            WritableFont wf = new WritableFont(WritableFont.createFont("宋体"), 10, WritableFont.BOLD, false);
            WritableCellFormat wcf = new WritableCellFormat(wf);
            Label label = new Label(colIndex, rowIndex, entry.getKey().toString(), wcf);
            writableSheet.addCell(label);
            colIndex++;
        }

        rowIndex++;

        for (Object obj :
                list) {
            colIndex = 0;
            for (String str :
                    colList) {
                Field field = obj.getClass().getDeclaredField(str);
                field.setAccessible(true);
                Label label = new Label(colIndex, rowIndex, field.get(obj).toString());
                writableSheet.addCell(label);
                colIndex++;
            }
            rowIndex++;
        }

        wwb.write();
        wwb.close();
        os.flush();
        os.close();

field.setAccessible(true); 这个设置可以访问到private的值。

Map