POI 数据toEXCEL

public class TestPOI2Excel {

@Test
public void testWrite03Excel() throws Exception {
//1、创建工作簿
HSSFWorkbook workbook = new HSSFWorkbook();
//2、创建工作表
HSSFSheet sheet = workbook.createSheet("hello world");//指定工作表名
//3、创建行；创建第3行
HSSFRow row = sheet.createRow(2);
//4、创建单元格；创建第3行第3列
HSSFCell cell = row.createCell(2);
cell.setCellValue("Hello World");

//输出到硬盘
FileOutputStream outputStream = new FileOutputStream("D:\itcast\测试.xls");
//把excel输出到具体的地址
workbook.write(outputStream);
workbook.close();
outputStream.close();
}

@Test
public void testWrite07Excel() throws Exception {
//1、创建工作簿
XSSFWorkbook workbook = new XSSFWorkbook();
//2、创建工作表
XSSFSheet sheet = workbook.createSheet("hello world");//指定工作表名
//3、创建行；创建第3行
XSSFRow row = sheet.createRow(2);
//4、创建单元格；创建第3行第3列
XSSFCell cell = row.createCell(2);
cell.setCellValue("Hello World");

//输出到硬盘
FileOutputStream outputStream = new FileOutputStream("D:\itcast\测试.xlsx");
//把excel输出到具体的地址
workbook.write(outputStream);
workbook.close();
outputStream.close();
}

@Test
public void testRead03Excel() throws Exception {
FileInputStream inputStream = new FileInputStream("D:\itcast\测试.xls");
//1、读取工作簿
HSSFWorkbook workbook = new HSSFWorkbook(inputStream);
//2、读取第一个工作表
HSSFSheet sheet = workbook.getSheetAt(0);
//3、读取行；读取第3行
HSSFRow row = sheet.getRow(2);
//4、读取单元格；读取第3行第3列
HSSFCell cell = row.getCell(2);
System.out.println("第3行第3列单元格的内容为：" + cell.getStringCellValue());

workbook.close();
inputStream.close();
}

@Test
public void testRead07Excel() throws Exception {
FileInputStream inputStream = new FileInputStream("D:\itcast\测试.xlsx");
//1、读取工作簿
XSSFWorkbook workbook = new XSSFWorkbook(inputStream);
//2、读取第一个工作表
XSSFSheet sheet = workbook.getSheetAt(0);
//3、读取行；读取第3行
XSSFRow row = sheet.getRow(2);
//4、读取单元格；读取第3行第3列
XSSFCell cell = row.getCell(2);
System.out.println("第3行第3列单元格的内容为：" + cell.getStringCellValue());

workbook.close();
inputStream.close();
}

@Test
public void testRead03And07Excel() throws Exception {
String fileName = "D:\itcast\测试.xlsx";
if(fileName.matches("^.+\.(?i)((xls)|(xlsx))$")){//判断是否excel文档

boolean is03Excel = fileName.matches("^.+\.(?i)(xls)$");

FileInputStream inputStream = new FileInputStream(fileName);

//1、读取工作簿
Workbook workbook = is03Excel ?new HSSFWorkbook(inputStream):new XSSFWorkbook(inputStream);
//2、读取第一个工作表
Sheet sheet = workbook.getSheetAt(0);
//3、读取行；读取第3行
Row row = sheet.getRow(2);
//4、读取单元格；读取第3行第3列
Cell cell = row.getCell(2);
System.out.println("第3行第3列单元格的内容为：" + cell.getStringCellValue());

workbook.close();
inputStream.close();
}
}

@Test
public void testExcelStyle() throws Exception {
//1、创建工作簿
HSSFWorkbook workbook = new HSSFWorkbook();
//1.1、创建合并单元格对象;合并第3行的第3列到第5列
CellRangeAddress cellRangeAddress = new CellRangeAddress(2, 2, 2, 4);//起始行号，结束行号，起始列号，结束列号
//1.2、创建单元格样式
HSSFCellStyle style = workbook.createCellStyle();
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);//水平居中
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);//垂直居中
//1.3、创建字体
HSSFFont font = workbook.createFont();
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);//加粗字体
font.setFontHeightInPoints((short) 16);//设置字体大小
//加载字体
style.setFont(font);

//单元格背景
//设置背景填充模式
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
//设置填充背景色
style.setFillBackgroundColor(HSSFColor.YELLOW.index);
//设置填充前景色
style.setFillForegroundColor(HSSFColor.RED.index);

//2、创建工作表
HSSFSheet sheet = workbook.createSheet("Hello World");//指定工作表名
//2.1、加载合并单元格对象
sheet.addMergedRegion(cellRangeAddress);

//3、创建行；创建第3行
HSSFRow row = sheet.createRow(2);
//4、创建单元格；创建第3行第3列
HSSFCell cell = row.createCell(2);
//加载样式
cell.setCellStyle(style);
cell.setCellValue("Hello World!");

//输出到硬盘
FileOutputStream outputStream = new FileOutputStream("D:\itcast\测试.xls");
//把excel输出到具体的地址
workbook.write(outputStream);
workbook.close();
outputStream.close();
}

}