Java Poi Excel 基本操作

最近做的java项目有涉及到生成Poi Excel的模块，特此记录。

Version: java 1.8  Editor: IntelliJ

//生成xlsx，所以使用XSSF
//创建sheet
XSSFWorkbook wb = new XSSFWorkbook();
XSSFSheet sheet = wb.createSheet(sheetName);

//设置字体、大小
Font font = wb.createFont();
font.setFontHeightInPoints(FONT_SIZE);
font.setFontName(FONT_NAME);

CellStyle style = wb.createCellStyle();
style.setFont(font);

//设置居中
style.setAlignment(HorizontalAlignment.CENTER);

//合并单元格
CellRangeAddress title = new CellRangeAddress(0, 0, 0, 7);
sheet.addMergedRegion(title);

//创建行、格
XSSFRow row = sheet.createRow(0);
XSSFCell cell = row.createCell(0);

//Excel API默认每列宽度相等
sheet.setColumnWidth(0, 600); //设置第0列 宽度为600

sheet.autoSizeColumn(0);    //让第0列 根据内容自适应宽度

//输出 response为ServletResponse类
try {
    wb.write(response.getOutputStream());
} catch (Exception e) {
    e.printStackTrace();
} finally {
    wb.close();
}