API参考：
http://www.andykhan.com/jexcelapi/index.html
官网：
http://jexcelapi.sourceforge.net/
1. 创建可写的工作簿workbook
WritableWorkbook workbook = Workbook.createWorkbook(new File("c:\test.xls"));
2. 读取现有的工作簿workbook（不可写）
Workbook workbook = Workbook.getWorkbook(new File("c:\template.xls"));
3. 创建可写的Sheet
workbook.createSheet("name", 0);
4. 读取现有的Sheet
workbook.getSheet(0);
5. 创建Label
Label label = new Label(0,0,"content");
6. 将Label 添加到Sheet
sheet.addCell(label);
7. 根据模板创建workbook
Workbook template = Workbook.getWorkbook(new File("c:\template.xls")); WritableWorkbook workbook = Workbook.createWorkbook(new File("c:\test.xls"),template);
8. 创建Excel的例子
WritableWorkbook workbook = Workbook.createWorkbook(new File("c:\test.xls")); WritableSheet sheet = workbook.getSheet(0); Label label1 = new Label(0,0,"content"); Label label2 = new Label(0,1,"content"); sheet.addCell(label1); sheet.addCell(label2); workbook.write(); workbook.close();
9. 根据模板创建Excel的例子
Workbook template = Workbook.getWorkbook(new File("c:\template.xls")); WritableWorkbook workbook = Workbook.createWorkbook(new File("c:\test.xls"),template); WritableSheet sheet = workbook.getSheet(0); Label label1 = new Label(0,0,"content"); Label label2 = new Label(0,1,"content"); sheet.addCell(label1); sheet.addCell(label2); workbook.write(); workbook.close();
10. 使用模板单元格的格式
Workbook template = Workbook.getWorkbook(new File("c:\template.xls")); WritableWorkbook workbook = Workbook.createWorkbook(new File("c:\test.xls"),template); WritableSheet sheet = workbook.getSheet(0); //获取模板单元格的格式（字体，颜色等） CellFormat cellFormat = sheet.getWritableCell(0, 0).getCellFormat(); Label label = new Label(0,0,"content",cellFormat); sheet.addCell(label); workbook.write(); workbook.close();
11. 处理换行
WritableCellFormat wcf = new WritableCellFormat(); wcf.setWrap(true); wcf.setVerticalAlignment(VerticalAlignment.CENTRE); Label label= new Label(0, 0,wcf);
12. struts2 下载excel
public InputStream getInputStream(){ try { ByteArrayOutputStream os = new ByteArrayOutputStream(); Workbook template = Workbook.getWorkbook(new File("c:\template.xls")); WritableWorkbook workbook = Workbook.createWorkbook(os,template); WritableSheet sheet = workbook.getSheet(0); CellFormat cellFormat = sheet.getWritableCell(0, 0).getCellFormat(); Label label = new Label(0,0,"content",cellFormat); sheet.addCell(label); workbook.write(); workbook.close(); return new ByteArrayInputStream(os.toByteArray()); } catch (Exception e) { logger.error(e.getMessage(), e); return null; } }