Java利用Easyexcel导出excel表格的示例代码
目录
1.导入 EasyExcel Maven包
2.配置
3.输出Excel到前端
1.导入 EasyExcel Maven包<!--easyexcel 导出excel依赖-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>2.2.7</version>
</dependency>
2.配置
配置表格表头样式，以及内容的写入方式
import com.alibaba.excel.write.handler.SheetWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteWorkbookHolder;
import org.apache.poi.ss.usermodel.*;
import java.util.List;
public class EasyExcelWriteHandler implements SheetWriteHandler {
/**
* 表头数据
*/
private final List<String> headsDatas;
/**
* 内容数据
*/
private final List<List<String>> bodyDatas;
/**
* 表头样式
*/
private CellStyle cellStyle;
/**
* 内容样式
*/
private CellStyle cellStyleHeader;
public EasyExcelWriteHandler(List<String> headsDatas, List<List<String>> bodyDatas) {
this.headsDatas = headsDatas;
this.bodyDatas = bodyDatas;
}
@Override
public void beforeSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
}
@Override
public void afterSheetCreate(WriteWorkbookHolder writeWorkbookHolder, WriteSheetHolder writeSheetHolder) {
Workbook workbook = writeWorkbookHolder.getWorkbook();
Sheet sheet = workbook.getSheetAt(0);
// 表头样式
if (cellStyleHeader == null) {
cellStyleHeader = workbook.createCellStyle();
cellStyleHeader.setAlignment(HorizontalAlignment.CENTER);
cellStyleHeader.setVerticalAlignment(VerticalAlignment.CENTER);
cellStyleHeader.setFillForegroundColor(IndexedColors.WHITE.getIndex());
Font font = workbook.createFont();
// 字体大小
font.setFontHeightInPoints((short) 16);
// 字体
font.setFontName("微软雅黑");
//加粗
font.setBold(true);
cellStyleHeader.setFont(font);
}
// 内容样式
if (cellStyle == null) {
cellStyle = workbook.createCellStyle();
cellStyle.setAlignment(HorizontalAlignment.CENTER);
cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
cellStyle.setFillForegroundColor(IndexedColors.WHITE.getIndex());
Font font = workbook.createFont();
font.setFontName("微软雅黑");
font.setFontHeightInPoints((short) 12);
cellStyle.setFont(font);
}
//表头内容
Row row = sheet.getRow(0);
if (row == null) {
row = sheet.createRow(0);
}
//遍历写入表头
for (int rowInt = 0; rowInt < headsDatas.size(); rowInt++) {
//获取列内容
String cellValue = headsDatas.get(rowInt);
//根据表头内容设置表头列宽（自适应表头宽度）
sheet.setColumnWidth(rowInt, cellValue.length() * 875);
Cell cell = row.getCell(rowInt);
if (cell == null) {
cell = row.createCell(rowInt);
}
cell.setCellStyle(cellStyleHeader);
cell.setCellValue(cellValue);
//遍历写入内容
if (rowInt < bodyDatas.size()) {
for (int bodyRowInt = 0; bodyRowInt < bodyDatas.get(rowInt).size(); bodyRowInt++) {
Row row0 = sheet.getRow(bodyRowInt + 1);
if (row0 == null) {
row0 = sheet.createRow(bodyRowInt + 1);
}
Cell cell0 = row0.getCell(rowInt);
if (cell0 == null) {
cell0 = row0.createCell(rowInt);
}
cell0.setCellStyle(cellStyle);
cell0.setCellValue(bodyDatas.get(rowInt).get(bodyRowInt));
}
}
}
}
}
3.输出Excel到前端
public static void easyUtil1(ExcelBody excelBody) throws IOException {
//转换内容数据
List<List<String>> list2 = new ArrayList<>();
for (List<Object> objects : excelBody.getBodyDatas()) {
List<String> strs = new ArrayList<>();
for (Object object : objects) {
strs.add(String.valueOf(object));
}
list2.add(strs);
}
//设置表名
String simpleDateFormat = new String((new SimpleDateFormat("yyyyMMddHHmmss").format(new Date())).getBytes(), "UTF-8");
//设置字符编码
response.setCharacterEncoding("utf-8");
//设置内容类型
response.setContentType("application/vnd.ms-excel");
//设置标题
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(excelBody.getFileName() + simpleDateFormat + ".xlsx", "utf-8"));
//核心代码
//方式一：
//EasyExcel.write(response.getOutputStream()).head(list2).sheet("sheet1").doWrite(list2);
//方式二：
ExcelWriterBuilder writerBuilder = EasyExcel.write(response.getOutputStream());
writerBuilder.registerWriteHandler(new EasyExcelWriteHandler(excelBody.getHeads(), list2));
ExcelWriter excelWriter = writerBuilder.build();
ExcelWriterSheetBuilder writerSheetBuilder = EasyExcel.writerSheet("Sheet1");
excelWriter.write(new ArrayList<>(), writerSheetBuilder.build());
excelWriter.finish();
}
@Data
public class ExcelBody {
/**
* 文件名
*/
private String fileName;
/**
* 表头
*/
private List<String> heads;
/**
* 数据体
*/
private List<List<Object>> bodyDatas;
}
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