Apache POI 下载
- 创建Excel表
public class Test {
/** 存储路径 */
private static String path = "E:/Student.xls";
/** 列表信息 */
private static List<Student> mList;
/** 工作簿 */
private static HSSFWorkbook workbook;
/** 格式化时间 */
static SimpleDateFormat dateFormat;
static {
mList = new ArrayList<Student>();
dateFormat = new SimpleDateFormat("yyyy-mm-dd");
try {
Student user1 = new Student(1, "张三", 16, dateFormat.parse("1997-03-12"));
Student user2 = new Student(2, "李四", 17, dateFormat.parse("1996-08-12"));
Student user3 = new Student(3, "王五", 26, dateFormat.parse("1985-11-12"));
mList.add(user1);
mList.add(user2);
mList.add(user3);
} catch (ParseException e) {
e.printStackTrace();
}
}
/**
* 主函数
*/
public static void main(String[] args) {
// 创建一个工作簿
workbook = new HSSFWorkbook();
// 第二步, 在WebBook中添加一个sheet,对应Excel中的sheet
HSSFSheet sheet = workbook.createSheet("学生表一");
// 第三步, 在sheet中添加表头第0行
HSSFRow row = sheet.createRow(0);
// 第四步, 创建单元格, 并设置值表头, 设置表头居中
HSSFCellStyle style = workbook.createCellStyle();
// 创建一个居中显示的头
style.setAlignment(HorizontalAlignment.CENTER);
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
// 创建第一行
HSSFCell cell = row.createCell(0);
cell.setCellValue("学号");
cell.setCellStyle(style);
cell = row.createCell(1);
cell.setCellValue("姓名");
cell.setCellStyle(style);
cell = row.createCell(2);
cell.setCellValue("年龄");
cell.setCellStyle(style);
cell = row.createCell(3);
cell.setCellValue("生日");
cell.setCellStyle(style);
String[] textlist = { "16", "17", "26", "20", "23" };
// 创建下拉列表
sheet = setHSSFValidation(sheet, textlist, 0, 500, 2, 2);
// 写入实体数据
for (int i = 0; i < mList.size(); i++) {
row = sheet.createRow(i + 1);
Student student = mList.get(i);
// 第四步,创建单元格并设置值
row.createCell(0).setCellValue(student.getId());
row.createCell(1).setCellValue(student.getName());
row.createCell(2).setCellValue(student.getAge());
row.createCell(3).setCellValue(dateFormat.format(student.getBirth()));
}
try {
FileOutputStream fos = new FileOutputStream(path);
workbook.write(fos);
fos.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 设置某些列的值只能输入预制的数据,显示下拉框.
* @param sheet 要设置的sheet.
* @param textlist 下拉框显示的内容
* @param firstRow 开始行
* @param endRow 结束行
* @param firstCol 开始列
* @param endCol 结束列
* @return 设置好的sheet.
*/
private static HSSFSheet setHSSFValidation(HSSFSheet sheet, String[] textlist, int firstRow, int lastRow,
int firstCol, int lastCol) {
// 加载下拉列表内容
DVConstraint constraint = DVConstraint.createExplicitListConstraint(textlist);
// 设置数据有效性加载在哪个单元格上,四个参数分别是：起始行、终止行、起始列、终止列
CellRangeAddressList regions = new CellRangeAddressList(firstRow, lastRow, firstCol, lastCol);
// 数据有效性对象
HSSFDataValidation dataValidation = new HSSFDataValidation(regions, constraint);
sheet.addValidationData(dataValidation);
return sheet;
}
/**
* 设置单元格上提示
* @param sheet 要设置的sheet.
* @param promptTitle 标题
* @param promptContent 内容
* @param firstRow 开始行
* @param endRow 结束行
* @param firstCol 开始列
* @param endCol 结束列
* @return 设置好的sheet.
*/
public static HSSFSheet setHSSFPrompt(HSSFSheet sheet, String promptTitle,
String promptContent, int firstRow, int endRow ,int firstCol,int endCol) {
// 构造constraint对象
DVConstraint constraint = DVConstraint.createCustomFormulaConstraint("BB1");
// 四个参数分别是：起始行、终止行、起始列、终止列
CellRangeAddressList regions = new CellRangeAddressList(firstRow,endRow,firstCol, endCol);
// 数据有效性对象
HSSFDataValidation data_validation_view = new HSSFDataValidation(regions,constraint);
data_validation_view.createPromptBox(promptTitle, promptContent);
sheet.addValidationData(data_validation_view);
return sheet;
}
}
- 读取Excel表
/**
* 读取Excel表格的功能类
*/
public class ExcelReader {
private POIFSFileSystem fs;
private HSSFWorkbook wb;
private HSSFSheet sheet;
private HSSFRow row;
/**
* 读取Excel表格表头的内容
* @param InputStream
* @return String 表头内容的数组
*/
public String[] readExcelTitle(InputStream is) {
try {
fs = new POIFSFileSystem(is);
wb = new HSSFWorkbook(fs);
} catch (IOException e) {
e.printStackTrace();
}
sheet = wb.getSheetAt(0);
row = sheet.getRow(0);
// 标题总列数
int colNum = row.getPhysicalNumberOfCells();
System.out.println("colNum:" + colNum);
String[] title = new String[colNum];
for (int i = 0; i < colNum; i++) {
//title[i] = getStringCellValue(row.getCell((short) i));
title[i] = getCellFormatValue(row.getCell((short) i));
}
return title;
}
/**
* 读取Excel数据内容
* @param InputStream
* @return Map 包含单元格数据内容的Map对象
*/
public Map<Integer, String> readExcelContent(InputStream is) {
Map<Integer, String> content = new HashMap<Integer, String>();
String str = "";
try {
fs = new POIFSFileSystem(is);
wb = new HSSFWorkbook(fs);
} catch (IOException e) {
e.printStackTrace();
}
sheet = wb.getSheetAt(0);
// 得到总行数
int rowNum = sheet.getLastRowNum();
row = sheet.getRow(0);
int colNum = row.getPhysicalNumberOfCells();
// 正文内容应该从第二行开始,第一行为表头的标题
for (int i = 1; i <= rowNum; i++) {
row = sheet.getRow(i);
int j = 0;
while (j < colNum) {
// 每个单元格的数据内容用"-"分割开，以后需要时用String类的replace()方法还原数据
// 也可以将每个单元格的数据设置到一个javabean的属性中，此时需要新建一个javabean
// str += getStringCellValue(row.getCell((short) j)).trim() +
// "-";
str += getCellFormatValue(row.getCell((short) j)).trim() + " ";
j++;
}
content.put(i, str);
str = "";
}
return content;
}
/**
* 获取单元格数据内容为字符串类型的数据
*
* @param cell Excel单元格
* @return String 单元格数据内容
*/
private String getStringCellValue(HSSFCell cell) {
if (null == cell) {
return "";
}
String strCell = "";
switch (cell.getCellTypeEnum()) {
case STRING:
strCell = cell.getStringCellValue();
break;
case NUMERIC:
strCell = String.valueOf(cell.getNumericCellValue());
break;
case BOOLEAN:
strCell = String.valueOf(cell.getBooleanCellValue());
break;
case BLANK:
strCell = "";
break;
default:
strCell = "";
break;
}
if (strCell.equals("") || strCell == null) {
return "";
}
return strCell;
}
/**
* 获取单元格数据内容为日期类型的数据
*
* @param cell
* Excel单元格
* @return String 单元格数据内容
*/
private String getDateCellValue(HSSFCell cell) {
String result = "";
try {
CellType cellType = cell.getCellTypeEnum();
if (cellType == CellType.NUMERIC) {
Date date = cell.getDateCellValue();
result = (date.getYear() + 1900) + "-" + (date.getMonth() + 1)
+ "-" + date.getDate();
} else if (cellType == CellType.STRING) {
String date = getStringCellValue(cell);
result = date.replaceAll("[年月]", "-").replace("日", "").trim();
} else if (cellType == CellType.BLANK) {
result = "";
}
} catch (Exception e) {
System.out.println("日期格式不正确!");
e.printStackTrace();
}
return result;
}
/**
* 根据HSSFCell类型设置数据
* @param cell
* @return
*/
private String getCellFormatValue(HSSFCell cell) {
String cellvalue = "";
if (cell != null) {
// 判断当前Cell的Type
switch (cell.getCellTypeEnum()) {
// 如果当前Cell的Type为NUMERIC
case NUMERIC:
case FORMULA: {
// 判断当前的cell是否为Date
if (HSSFDateUtil.isCellDateFormatted(cell)) {
// 如果是Date类型则，转化为Data格式
//方法1：这样子的data格式是带时分秒的：2011-10-12 0:00:00
//cellvalue = cell.getDateCellValue().toLocaleString();
//方法2：这样子的data格式是不带带时分秒的：2011-10-12
Date date = cell.getDateCellValue();
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
cellvalue = sdf.format(date);
}
// 如果是纯数字
else {
// 取得当前Cell的数值
cellvalue = String.valueOf(cell.getNumericCellValue());
}
break;
}
// 如果当前Cell的Type为STRIN
case STRING:
// 取得当前的Cell字符串
cellvalue = cell.getRichStringCellValue().getString();
break;
// 默认的Cell值
default:
cellvalue = " ";
}
} else {
cellvalue = "";
}
return cellvalue;
}
/** 存储路径 */
private static String path = "E:/Student.xls";
public static void main(String[] args) {
try {
// 对读取Excel表格标题测试
InputStream is = new FileInputStream(path);
ExcelReader excelReader = new ExcelReader();
String[] title = excelReader.readExcelTitle(is);
System.out.println("获得Excel表格的标题:");
for (String s : title) {
System.out.print(s + " ");
}
System.out.println("");
// 对读取Excel表格内容测试
InputStream is2 = new FileInputStream(path);
Map<Integer, String> map = excelReader.readExcelContent(is2);
System.out.println("获得Excel表格的内容:");
for (int i = 1; i <= map.size(); i++) {
System.out.println(map.get(i));
}
} catch (FileNotFoundException e) {
System.out.println("未找到指定路径的文件!");
e.printStackTrace();
}
}
}