【Excel & PDF 系列】EasyExcel + iText 库实现 Excel 转换 PDF
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.metadata.data.ReadCellData;
import com.alibaba.excel.util.ConverterUtils;
import com.itextpdf.text.*;
import com.itextpdf.text.Font;
import com.itextpdf.text.pdf.BaseFont;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;
import lombok.extern.slf4j.Slf4j;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@Slf4j
public class NoModelDataListener extends AnalysisEventListener<Map<Integer, String>> {
// 存储读取到 excel 的每一行
private List<Map<Integer, String>> cachedDataList = new ArrayList<>();
// 存储读取到 excel 的列头
private Map<Integer, String> cachedHead = new HashMap<>();
//自定义返回结果类，也就是与传递给controller的实体类
ExcelDataVo excelDataVo;
//重点:通过构造器把 excelDataVo 对象传递过来
public NoModelDataListener(ExcelDataVo excelDataVo) {
this.excelDataVo = excelDataVo;
}
@Override
public void invoke(Map<Integer, String> data, AnalysisContext context) {
cachedDataList.add(data);
}
@Override
public void invokeHead(Map<Integer, ReadCellData<?>> headMap, AnalysisContext context) {
cachedHead = ConverterUtils.convertToStringMap(headMap, context);
}
@Override
public void doAfterAllAnalysed(AnalysisContext context) {
String pdfFilePath = "D:\\对账明细报告.pdf";
try (FileOutputStream fos = new FileOutputStream(pdfFilePath)) {
// 创建PDF文档对象
Document document = new Document(PageSize.A2, 50, 50, 50, 50);
// 创建PDF输出流
PdfWriter writer = PdfWriter.getInstance(document, fos);
// 打开PDF文档
document.open();
// 创建PDF表格对象
PdfPTable table = new PdfPTable(cachedDataList.get(0).size());
table.setHeaderRows(1);
//table.setWidths(new float[] {1, 2, 2, 2});
// 设置表格宽度
table.setWidthPercentage(100);
// 设置表格标题
//String sheetName = context.readSheetHolder().getSheetName();
String sheetName = excelDataVo.getTitle();
Paragraph title = new Paragraph(sheetName, new Font(BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED), 16, Font.BOLD));
title.setAlignment(Element.ALIGN_CENTER);
document.add(title);
// 添加表格标题
for (Map.Entry<Integer, String> entry : cachedHead.entrySet()) {
String value = entry.getValue();
PdfPCell pdfCell = new PdfPCell(new Paragraph(value, new Font(BaseFont.createFont("STSong-Light", "UniGB-UCS2-H", BaseFont.NOT_EMBEDDED), 12)));
pdfCell.setBorderWidth(1f);
pdfCell.setBorderColor(BaseColor.BLACK);
pdfCell.setPadding(5f);
pdfCell.setBackgroundColor(BaseColor.LIGHT_GRAY);
table.addCell(pdfCell);
}
// 添加表格内容
for (Map<Integer, String> map : cachedDataList) {
for (Map.Entry<Integer, String> entry : map.entrySet()) {
PdfPCell pdfCell = new PdfPCell(new Paragraph(entry.getValue()));
pdfCell.setBorderWidth(1f);
pdfCell.setBorderColor(BaseColor.BLACK);
pdfCell.setPadding(5f);
table.addCell(pdfCell);
}
}
// 添加表格到PDF文档
table.setSpacingBefore(20f);
table.setSpacingAfter(20f);
table.setKeepTogether(true);
document.add(table);
// 关闭PDF文档
document.close();
} catch (IOException | DocumentException e) {
e.printStackTrace();
}
excelDataVo.setPdfFilePath(pdfFilePath);
log.info("所有数据解析完成！");
}
}