导出效果：
上代码：
1.引入依赖
<!-- excel操作类 -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.17</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.poi/poi-ooxml-schemas -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>3.17</version>
</dependency>工具类：
package wylc.com.eshop.utils;
/**
* @author SongBin on 2019/9/23.
*/
import org.apache.poi.hssf.usermodel.HSSFDataFormat;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import javax.servlet.ServletOutputStream;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;
/**
* Excel 相关操作类(小数据量写入<=60000)
*/
public class Excel2007Utils {
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 + ".xlsx");
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 sheetTitle sheet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 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 IOException
*/
public static File writeExcelTitle(String directory, String fileName, String sheetName, List<String> columnNames,
String sheetTitle, boolean append) throws 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 IOException
*/
public static File writeExcelData(String directory, String fileName, String sheetName, List<List<Object>> objects)
throws 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 sheetTitle sheet页Title
* @param append 是否追加写文件
* @return file
*/
private static File exportExcelTitle(File file, String sheetName, List<String> columnNames,
String sheetTitle, boolean append) throws IOException {
// 声明一个工作薄
Workbook workBook;
if (file.exists() && append) {
workBook = new XSSFWorkbook(new FileInputStream(file));
} else {
workBook = new XSSFWorkbook();
}
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 XSSFRichTextString(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 XSSFRichTextString(columnNames.get(i));
cell.setCellValue(text);
}
try {
OutputStream ops = new FileOutputStream(file);
workBook.write(ops);
ops.flush();
ops.close();
} catch (IOException e) {
}
return file;
}
/**
* 导出字符串数据
*
* @param file 文件名
* @param objects 目标数据
* @return
*/
private static File exportExcelData(File file, String sheetName, List<List<Object>> objects) throws IOException {
// 声明一个工作薄
Workbook workBook;
if (file.exists()) {
workBook = new XSSFWorkbook(new FileInputStream(file));
} else {
workBook = new XSSFWorkbook();
}
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) {
}
return file;
}
/**
* 导出字符串数据
*
* @param file 文件名
* @param columnNames 表头
* @param sheetTitle sheet页Title
* @param objects 目标数据
* @param append 是否追加写文件
* @return
*/
private static File exportExcel(File file, String sheetName, List<String> columnNames,
String sheetTitle, List<List<Object>> objects, boolean append) throws IOException {
// 声明一个工作薄
Workbook workBook;
if (file.exists() && append) {
// 声明一个工作薄
workBook = new XSSFWorkbook(new FileInputStream(file));
} else {
workBook = new XSSFWorkbook();
}
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 XSSFRichTextString(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 XSSFRichTextString(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(XSSFCell.CELL_TYPE_NUMERIC);
contentCell.setCellStyle(contentIntegerStyle);
contentCell.setCellValue(Integer.parseInt(dataObject.toString()));
} else if (dataObject instanceof Double) {
contentCell.setCellType(XSSFCell.CELL_TYPE_NUMERIC);
contentCell.setCellStyle(contentDoubleStyle);
contentCell.setCellValue(Double.parseDouble(dataObject.toString()));
} else if (dataObject instanceof Long && dataObject.toString().length() == 13) {
contentCell.setCellType(XSSFCell.CELL_TYPE_STRING);
contentCell.setCellStyle(contentStyle);
contentCell.setCellValue(getCnDate(new Date(Long.parseLong(dataObject.toString()))));
} else if (dataObject instanceof Date) {
contentCell.setCellType(XSSFCell.CELL_TYPE_STRING);
contentCell.setCellStyle(contentStyle);
contentCell.setCellValue(getCnDate((Date) dataObject));
} else {
contentCell.setCellType(XSSFCell.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) {
}
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(BorderStyle.THIN);
style.setBorderLeft(BorderStyle.THIN);
style.setBorderRight(BorderStyle.THIN);
style.setBorderTop(BorderStyle.THIN);
//设置对齐样式
style.setAlignment(HorizontalAlignment.CENTER);
style.setVerticalAlignment(VerticalAlignment.CENTER);
// 生成字体
Font font = workbook.createFont();
// 表头样式
style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
font.setFontHeightInPoints((short) 12);
font.setBold(true);
// 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(BorderStyle.THIN);
style.setBorderLeft(BorderStyle.THIN);
style.setBorderRight(BorderStyle.THIN);
style.setBorderTop(BorderStyle.THIN);
//设置对齐样式
style.setAlignment(HorizontalAlignment.CENTER);
style.setVerticalAlignment(VerticalAlignment.CENTER);
// 生成字体
Font font = workbook.createFont();
// 正文样式
style.setFillPattern(FillPatternType.NO_FILL);
style.setVerticalAlignment(VerticalAlignment.CENTER);
font.setBold(false);
// 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(BorderStyle.THIN);
style.setBorderLeft(BorderStyle.THIN);
style.setBorderRight(BorderStyle.THIN);
style.setBorderTop(BorderStyle.THIN);
//设置对齐样式
style.setAlignment(HorizontalAlignment.CENTER);
style.setVerticalAlignment(VerticalAlignment.CENTER);
// 生成字体
Font font = workbook.createFont();
// 正文样式
style.setFillPattern(FillPatternType.NO_FILL);
style.setVerticalAlignment(VerticalAlignment.CENTER);
font.setBold(false);
// 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(BorderStyle.THIN);
style.setBorderLeft(BorderStyle.THIN);
style.setBorderRight(BorderStyle.THIN);
style.setBorderTop(BorderStyle.THIN);
//设置对齐样式
style.setAlignment(HorizontalAlignment.CENTER);
style.setVerticalAlignment(VerticalAlignment.CENTER);
// 生成字体
Font font = workbook.createFont();
// 正文样式
style.setFillPattern(FillPatternType.NO_FILL);
style.setVerticalAlignment(VerticalAlignment.CENTER);
font.setBold(false);
// 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;
}
public static void main(String[] args) throws IOException {
String sheetName = "测试Excel格式";
String sheetTitle = "测试Excel格式";
List<String> columnNames = new LinkedList<>();
columnNames.add("日期-String");
columnNames.add("日期-Date");
columnNames.add("时间戳-Long");
columnNames.add("客户编码");
columnNames.add("整数");
columnNames.add("带小数的正数");
//写入标题--第二种方式(先写入标题，再再写入数据)
Excel2007Utils.writeExcelTitle("E:\\temp", "a", sheetName, columnNames, sheetTitle, false);
List<List<Object>> objects = new LinkedList<>();
for (int i = 0; i < 1000; i++) {
List<Object> dataA = new LinkedList<>();
dataA.add("2016-09-05 17:27:25");
dataA.add(new Date(1451036631012L));
dataA.add(1451036631012L);
dataA.add("000628");
dataA.add(i);
dataA.add(1.323 + i);
objects.add(dataA);
}
try {
//写入数据--第二种方式(先写入标题，再再写入数据)
Excel2007Utils.writeExcelData("E:\\temp", "b", sheetName, objects);
//标题和数据一起写入--第一种方式
Excel2007Utils.writeExcel("E:\\temp", "a", sheetName, columnNames, sheetTitle, objects, false);
} catch (Exception e) {
e.printStackTrace();
}
}
}参考：https://www.jianshu.com/p/eac50d5f4c75
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注意：本文归作者所有，未经作者允许，不得转载
