使用Apache的POI相关API导出Excel设置单元格格式

栗子，一下各个代码之间的变量是通用的，要是在某个代码块中找不到某个变量，则可以向上找寻

准备工作

InputStream = template//文件输入流

XSSFWorkbook wb = new XSSFWorkbook(template);

Sheet sheet = wb.getSheetAt(0);

设置单元格格式

XSSFCellStyle cellStyle = wb.createCellStyle();//初始化单元格格式对象

cellStyle.setAlignment(CellStyle.ALIGN_GENERAL);//设置水平对齐方式，有多种对齐方式，如果你稍微了解一点英文也能知道：Alignment(水平)、ALIGN_LEFT(左对齐)

cellStyle.setVerticalAlignment(CellStyle.VERTICAL_CENTER);//设置垂直对齐方式,Vertical(垂直)

XSSFDataFormat dataFormat = wb.createDataFormat();//创建格式化对象

cellStyle.setDataFormat(dataFormat.getFormat("#,##0.00"));//设置数值类型格式为保留两位小数

cellStyle.setFillBackgroundColor(IndexedColors.PINK.getIndex());;//设置单元格背景色为骚粉

cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);//改用指定模式填充单元格颜色(主要用于使你设置的颜色生效以及生效方式)

cellStyle.setWrapText(true);//开启自动换行

Row excelRow = sheet.createRow(0);//创建单元行，索引从0开始

excelRow.setHeightInPoints(30);//设置行高

sheet.setColumnWidth(i, 256 * 15);//设置某列的列宽，列号为“i”

Cell cell = excelRow.createCell(0);//创建单元格，索引从0开始

cell.setCellStyle(cellStyle);// 设置单元格格式

创建各种类型单元格

// 创建数字类型的单元格

Cell cell = row.createCell((short)0);

cell.setCellValue(1);

row.createCell(1).setCellValue(1.2);

//创建单元格并接设置值为简单字符串

row.createCell(2).setCellValue("This is a string cell");

//创建单元格并接设置值为富文本

RichTextString str = creationHelper.createRichTextString("Apache");

Font font = wb.createFont();

font.setItalic(true);

font.setUnderline(Font.U_SINGLE);

str.applyFont(font);

row.createCell(3).setCellValue(str);

//创建boolean类型的单元格

row.createCell(4).setCellValue(true);

//创建单元格，当前单元的值是通过公式得到的 formula

row.createCell(5).setCellFormula("SUM(A1:B1)");

//创建日期类型的单元格并接进行格式化

CellStyle style = wb.createCellStyle();

style.setDataFormat(creationHelper.createDataFormat().getFormat("m/d/yy h:mm"));

cell = row.createCell(6);

cell.setCellValue(new Date());

cell.setCellStyle(style);

//创建超链接类型的单元格

cell.setCellFormula("HYPERLINK(\"http://baidu.com\",\"baidu\")");

创建单元格注释

CreationHelper factory = wb.getCreationHelper();

Cell cell = sheet.createRow(1).createCell(1);//创建第二行第二列的单元格

Drawing drawing = sheet.createDrawingPatriarch(); //创建顶层DrawingPatriarch，用于添加图形或图表(通常会覆盖原有效果)

ClientAnchor anchor = factory.createClientAnchor(); //创建ClientAnchor，使用此对象将工程图对象放置在工作表中

Comment comment = drawing.createCellComment(anchor); //创建注释

RichTextString text = creationHelper.createRichTextString("flydoging's demo");

Font font = wb.createFont(); //创建字体用于设置注释字体格式

font.setFontName("Arial");

font.setFontHeightInPoints((short)14);

font.setBoldweight(Font.BOLDWEIGHT_BOLD);

font.setColor(IndexedColors.RED.getIndex()); //设置红色字体

text.applyFont(font);

comment.setString(text);//设置注释体

comment.setAuthor("flydoging");//设置作者

cell.setCellComment(comment);

CreationHelper是个啥，官方文档

An object that handles instantiating concrete classes of the various instances one needs for HSSF and XSSF. Works around a limitation in Java where we cannot have static methods on interfaces or abstract classes. This allows you to get the appropriate class for a given interface, without you having to worry about if you’re dealing with HSSF or XSSF.

英文不太好，大概意思是说：你可以使用CreationHelper的创建各种用于HSSF、XSSF实例化的对象，通过它的API也可以发现：创建富文本、超链接等等。其实你通过上边wb创建的是HSSFCreationHelper, SXSSFCreationHelper, XSSFCreationHelper三个其中之一，具体是哪个取决于你使用的WorkBook。

获取文档的嵌入文件

public static void main(String[] args) throws Exception {

XSSFWorkbook workbook = new XSSFWorkbook(args[0]);

for (PackagePart pPart : workbook.getAllEmbedds()) {

String contentType = pPart.getContentType();

// Excel Workbook - either binary or OpenXML

if (contentType.equals("application/vnd.ms-excel")) {//offic 2003 excel

HSSFWorkbook embeddedWorkbook = new HSSFWorkbook(pPart.getInputStream());

}

// Excel Workbook - OpenXML file format

else if (contentType.equals("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")) {//offic 2007 excel

XSSFWorkbook embeddedWorkbook = new XSSFWorkbook(pPart.getInputStream());

}

// Word Document - binary (OLE2CDF) file format

else if (contentType.equals("application/msword")) {//offic 2003 word

HWPFDocument document = new HWPFDocument(pPart.getInputStream());

}

// Word Document - OpenXML file format

else if (contentType.equals("application/vnd.openxmlformats-officedocument.wordprocessingml.document")) {

XWPFDocument document = new XWPFDocument(pPart.getInputStream());

}

// PowerPoint Document - binary file format

else if (contentType.equals("application/vnd.ms-powerpoint")) {

HSLFSlideShow slideShow = new HSLFSlideShow(pPart.getInputStream());

}

// PowerPoint Document - OpenXML file format

else if (contentType.equals("application/vnd.openxmlformats-officedocument.presentationml.presentation")) {

OPCPackage docPackage = OPCPackage.open(pPart.getInputStream());

XSLFSlideShow slideShow = new XSLFSlideShow(docPackage);

}

// Any other type of embedded object.

else {

System.out.println("Unknown Embedded Document: " + contentType);

InputStream inputStream = pPart.getInputStream();

}

}

}