使用Apache POI导出Excel小结
import org.apache.poi.hssf.usermodel.*; import org.apache.poi.hssf.util.HSSFColor;import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import javax.imageio.ImageIO;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
/**
* Excel 相关操作类(小数据量写入<=65536)
*/
public> private static final int DEFAULT_COLUMN_SIZE = 30;
/**
* 断言Excel文件写入之前的条件
*
* @param directory 目录
* @param fileName文件名
* @return file
* @throws IOException
*/
private static File assertFile(String directory, String fileName) throws IOException {
File tmpFile = new File(directory + File.separator + fileName + ".xls");
if (tmpFile.exists()) {
if (tmpFile.isDirectory()) {
throw new IOException("File '" + tmpFile + "' exists but is a directory");
}
if (!tmpFile.canWrite()) {
throw new IOException("File '" + tmpFile + "' cannot be written to");
}
} else {
File parent = tmpFile.getParentFile();
if (parent != null) {
if (!parent.mkdirs() && !parent.isDirectory()) {
throw new IOException("Directory '" + parent + "' could not be created");
}
}
}
return tmpFile;
}
/**
* 日期转化为字符串,格式为yyyy-MM-dd HH:mm:ss
*/
private static String getCnDate(Date date) {
String format = "yyyy-MM-dd HH:mm:ss";
SimpleDateFormat sdf = new SimpleDateFormat(format);
return sdf.format(date);
}
/**
* Excel 导出，POI实现
*
* @param fileName 文件名
* @param sheetName sheet页名称
* @param columnNames 表头列表名
* @param sheetTitlesheet页Title
* @param objects 目标数据集
*/
public static File writeExcel(String directory, String fileName, String sheetName, List<String> columnNames,
String sheetTitle, List<List<Object>> objects, boolean append) throws ReportInternalException, IOException {
File tmpFile = assertFile(directory, fileName);
return exportExcel(tmpFile, sheetName, columnNames, sheetTitle, objects, append);
}
/**
* Excel 导出，POI实现，先写入Excel标题，与writeExcelData配合使用
* 先使用writeExcelTitle再使用writeExcelData
*
* @param directory 目录
* @param fileName 文件名
* @param sheetName sheetName
* @param columnNames 列名集合
* @param sheetTitle表格标题
* @param append 是否在现有的文件追加
* @return file
* @throws ReportInternalException
* @throws IOException
*/
public static File writeExcelTitle(String directory, String fileName, String sheetName, List<String> columnNames,
String sheetTitle, boolean append) throws ReportInternalException, IOException {
File tmpFile = assertFile(directory, fileName);
return exportExcelTitle(tmpFile, sheetName, columnNames, sheetTitle, append);
}
/**
* Excel 导出，POI实现，写入Excel数据行列，与writeExcelTitle配合使用
* 先使用writeExcelTitle再使用writeExcelData
*
* @param directory 目录
* @param fileName文件名
* @param sheetName sheetName
* @param objects 数据信息
* @return file
* @throws ReportInternalException
* @throws IOException
*/
public static File writeExcelData(String directory, String fileName, String sheetName, List<List<Object>> objects)
throws ReportInternalException, IOException {
File tmpFile = assertFile(directory, fileName);
return exportExcelData(tmpFile, sheetName, objects);
}
/**
* 导出字符串数据
*
* @param file 文件名
* @param columnNames 表头
* @param sheetTitlesheet页Title
* @param append 是否追加写文件
* @return file
* @throws ReportInternalException
*/
private static File exportExcelTitle(File file, String sheetName, List<String> columnNames,
String sheetTitle, boolean append) throws ReportInternalException, IOException {
// 声明一个工作薄
Workbook workBook;
if (file.exists() && append) {
// 声明一个工作薄
workBook = new HSSFWorkbook(new FileInputStream(file));
} else {
workBook = new HSSFWorkbook();
}
Map<String, CellStyle> cellStyleMap = styleMap(workBook);
// 表头样式
CellStyle headStyle = cellStyleMap.get("head");
// 生成一个表格
Sheet sheet = workBook.getSheet(sheetName);
if (sheet == null) {
sheet = workBook.createSheet(sheetName);
}
//最新Excel列索引,从0开始
int lastRowIndex = sheet.getLastRowNum();
if (lastRowIndex > 0) {
lastRowIndex++;
}
// 设置表格默认列宽度
sheet.setDefaultColumnWidth(DEFAULT_COLUMN_SIZE);
// 合并单元格
sheet.addMergedRegion(new CellRangeAddress(lastRowIndex, lastRowIndex, 0, columnNames.size() - 1));
// 产生表格标题行
Row rowMerged = sheet.createRow(lastRowIndex);
lastRowIndex++;
Cell mergedCell = rowMerged.createCell(0);
mergedCell.setCellStyle(headStyle);
mergedCell.setCellValue(new HSSFRichTextString(sheetTitle));
// 产生表格表头列标题行
Row row = sheet.createRow(lastRowIndex);
for (int i = 0; i < columnNames.size(); i++) {
Cell cell = row.createCell(i);
cell.setCellStyle(headStyle);
RichTextString text = new HSSFRichTextString(columnNames.get(i));
cell.setCellValue(text);
}
try {
OutputStream ops = new FileOutputStream(file);
workBook.write(ops);
ops.flush();
ops.close();
} catch (IOException e) {
throw new ReportInternalException(e);
}
return file;
}
/**
* 导出字符串数据
*
* @param file 文件名
* @param objects 目标数据
* @return
* @throws ReportInternalException
*/
private static File exportExcelData(File file, String sheetName, List<List<Object>> objects) throws ReportInternalException, IOException {
// 声明一个工作薄
Workbook workBook;
if (file.exists()) {
// 声明一个工作薄
workBook = new HSSFWorkbook(new FileInputStream(file));
} else {
workBook = new HSSFWorkbook();
}
Map<String, CellStyle> cellStyleMap = styleMap(workBook);
// 正文样式
CellStyle contentStyle = cellStyleMap.get("content");
//正文整数样式
CellStyle contentIntegerStyle = cellStyleMap.get("integer");
//正文带小数整数样式
CellStyle contentDoubleStyle = cellStyleMap.get("double");
// 生成一个表格
Sheet sheet = workBook.getSheet(sheetName);
if (sheet == null) {
sheet = workBook.createSheet(sheetName);
}
//最新Excel列索引,从0开始
int lastRowIndex = sheet.getLastRowNum();
if (lastRowIndex > 0) {
lastRowIndex++;
}
// 设置表格默认列宽度
sheet.setDefaultColumnWidth(DEFAULT_COLUMN_SIZE);
// 遍历集合数据,产生数据行,前两行为标题行与表头行
for (List<Object> dataRow : objects) {
Row row = sheet.createRow(lastRowIndex);
lastRowIndex++;
for (int j = 0; j < dataRow.size(); j++) {
Cell contentCell = row.createCell(j);
Object dataObject = dataRow.get(j);
if (dataObject != null) {
if (dataObject instanceof Integer) {
contentCell.setCellStyle(contentIntegerStyle);
contentCell.setCellValue(Integer.parseInt(dataObject.toString()));
} else if (dataObject instanceof Double) {
contentCell.setCellStyle(contentDoubleStyle);
contentCell.setCellValue(Double.parseDouble(dataObject.toString()));
} else if (dataObject instanceof Long && dataObject.toString().length() == 13) {
contentCell.setCellStyle(contentStyle);
contentCell.setCellValue(getCnDate(new Date(Long.parseLong(dataObject.toString()))));
} else if (dataObject instanceof Date) {
contentCell.setCellStyle(contentStyle);
contentCell.setCellValue(getCnDate((Date) dataObject));
} else {
contentCell.setCellStyle(contentStyle);
contentCell.setCellValue(dataObject.toString());
}
} else {
contentCell.setCellStyle(contentStyle);
// 设置单元格内容为字符型
contentCell.setCellValue("");
}
}
}
try {
OutputStream ops = new FileOutputStream(file);
workBook.write(ops);
ops.flush();
ops.close();
} catch (IOException e) {
throw new ReportInternalException(e);
}
return file;
}
/**
* 导出字符串数据
*
* @param file 文件名
* @param columnNames 表头
* @param sheetTitlesheet页Title
* @param objects 目标数据
* @param append 是否追加写文件
* @return
* @throws ReportInternalException
*/
private static File exportExcel(File file, String sheetName, List<String> columnNames,
String sheetTitle, List<List<Object>> objects, boolean append) throws ReportInternalException, IOException {
// 声明一个工作薄
Workbook workBook;
if (file.exists() && append) {
// 声明一个工作薄
workBook = new HSSFWorkbook(new FileInputStream(file));
} else {
workBook = new HSSFWorkbook();
}
Map<String, CellStyle> cellStyleMap = styleMap(workBook);
// 表头样式
CellStyle headStyle = cellStyleMap.get("head");
// 正文样式
CellStyle contentStyle = cellStyleMap.get("content");
//正文整数样式
CellStyle contentIntegerStyle = cellStyleMap.get("integer");
//正文带小数整数样式
CellStyle contentDoubleStyle = cellStyleMap.get("double");
// 生成一个表格
Sheet sheet = workBook.getSheet(sheetName);
if (sheet == null) {
sheet = workBook.createSheet(sheetName);
}
//最新Excel列索引,从0开始
int lastRowIndex = sheet.getLastRowNum();
if (lastRowIndex > 0) {
lastRowIndex++;
}
// 设置表格默认列宽度
sheet.setDefaultColumnWidth(DEFAULT_COLUMN_SIZE);
// 合并单元格
sheet.addMergedRegion(new CellRangeAddress(lastRowIndex, lastRowIndex, 0, columnNames.size() - 1));
// 产生表格标题行
Row rowMerged = sheet.createRow(lastRowIndex);
lastRowIndex++;
Cell mergedCell = rowMerged.createCell(0);
mergedCell.setCellStyle(headStyle);
mergedCell.setCellValue(new HSSFRichTextString(sheetTitle));
// 产生表格表头列标题行
Row row = sheet.createRow(lastRowIndex);
lastRowIndex++;
for (int i = 0; i < columnNames.size(); i++) {
Cell cell = row.createCell(i);
cell.setCellStyle(headStyle);
RichTextString text = new HSSFRichTextString(columnNames.get(i));
cell.setCellValue(text);
}
// 遍历集合数据,产生数据行,前两行为标题行与表头行
for (List<Object> dataRow : objects) {
row = sheet.createRow(lastRowIndex);
lastRowIndex++;
for (int j = 0; j < dataRow.size(); j++) {
Cell contentCell = row.createCell(j);
Object dataObject = dataRow.get(j);
if (dataObject != null) {
if (dataObject instanceof Integer) {
contentCell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
contentCell.setCellStyle(contentIntegerStyle);
contentCell.setCellValue(Integer.parseInt(dataObject.toString()));
} else if (dataObject instanceof Double) {
contentCell.setCellType(HSSFCell.CELL_TYPE_NUMERIC);
contentCell.setCellStyle(contentDoubleStyle);
contentCell.setCellValue(Double.parseDouble(dataObject.toString()));
} else if (dataObject instanceof Long && dataObject.toString().length() == 13) {
contentCell.setCellType(HSSFCell.CELL_TYPE_STRING);
contentCell.setCellStyle(contentStyle);
contentCell.setCellValue(getCnDate(new Date(Long.parseLong(dataObject.toString()))));
} else if (dataObject instanceof Date) {
contentCell.setCellType(HSSFCell.CELL_TYPE_STRING);
contentCell.setCellStyle(contentStyle);
contentCell.setCellValue(getCnDate((Date) dataObject));
} else {
contentCell.setCellType(HSSFCell.CELL_TYPE_STRING);
contentCell.setCellStyle(contentStyle);
contentCell.setCellValue(dataObject.toString());
}
} else {
contentCell.setCellStyle(contentStyle);
// 设置单元格内容为字符型
contentCell.setCellValue("");
}
}
}
try {
OutputStream ops = new FileOutputStream(file);
workBook.write(ops);
ops.flush();
ops.close();
} catch (IOException e) {
throw new ReportInternalException(e);
}
return file;
}
/**
* 创建单元格表头样式
*
* @param workbook 工作薄
*/
private static CellStyle createCellHeadStyle(Workbook workbook) {
CellStyle style = workbook.createCellStyle();
// 设置边框样式
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
//设置对齐样式
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 生成字体
Font font = workbook.createFont();
// 表头样式
style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
style.setFillForegroundColor(HSSFColor.GREY_25_PERCENT.index);
font.setFontHeightInPoints((short) 12);
font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
// 把字体应用到当前的样式
style.setFont(font);
return style;
}
/**
* 创建单元格正文样式
*
* @param workbook 工作薄
*/
private static CellStyle createCellContentStyle(Workbook workbook) {
CellStyle style = workbook.createCellStyle();
// 设置边框样式
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
//设置对齐样式
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 生成字体
Font font = workbook.createFont();
// 正文样式
style.setFillPattern(HSSFCellStyle.NO_FILL);
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式
style.setFont(font);
return style;
}
/**
* 单元格样式(Integer)列表
*/
private static CellStyle createCellContent4IntegerStyle(Workbook workbook) {
CellStyle style = workbook.createCellStyle();
// 设置边框样式
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
//设置对齐样式
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 生成字体
Font font = workbook.createFont();
// 正文样式
style.setFillPattern(HSSFCellStyle.NO_FILL);
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式
style.setFont(font);
style.setDataFormat(HSSFDataFormat.getBuiltinFormat("#,##0"));//数据格式只显示整数
return style;
}
/**
* 单元格样式(Double)列表
*/
private static CellStyle createCellContent4DoubleStyle(Workbook workbook) {
CellStyle style = workbook.createCellStyle();
// 设置边框样式
style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
style.setBorderRight(HSSFCellStyle.BORDER_THIN);
style.setBorderTop(HSSFCellStyle.BORDER_THIN);
//设置对齐样式
style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
// 生成字体
Font font = workbook.createFont();
// 正文样式
style.setFillPattern(HSSFCellStyle.NO_FILL);
style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
font.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
// 把字体应用到当前的样式
style.setFont(font);
style.setDataFormat(HSSFDataFormat.getBuiltinFormat("#,##0.00"));//保留两位小数点
return style;
}
/**
* 单元格样式列表
*/
private static Map<String, CellStyle> styleMap(Workbook workbook) {
Map<String, CellStyle> styleMap = new LinkedHashMap<>();
styleMap.put("head", createCellHeadStyle(workbook));
styleMap.put("content", createCellContentStyle(workbook));
styleMap.put("integer", createCellContent4IntegerStyle(workbook));
styleMap.put("double", createCellContent4DoubleStyle(workbook));
return styleMap;
}
}
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