Java使用itextpdf實現(xiàn)Excel轉(zhuǎn)PDF
更新時間：2024年01月30日 10:27:16 作者：柚子攻城獅
這篇文章主要為大家詳細(xì)介紹了Java如何使用itextpdf實現(xiàn)Excel轉(zhuǎn)PDF,并且支持xlsx和xls兩種格,文中的示例代碼講解詳細(xì),希望對大家有所幫助
一、使用方式
1、本地轉(zhuǎn)換
- 導(dǎo)入依賴
- 創(chuàng)建工具方法
- 傳入輸入輸出流或文檔地址即可。
2、網(wǎng)絡(luò)下載
通過POI或者easyExcel生成或填充，再由后端轉(zhuǎn)換PDF響應(yīng)前端
思路：將網(wǎng)絡(luò)下載拆分為本地轉(zhuǎn)換，再響應(yīng)前端即可。
現(xiàn)在服務(wù)器創(chuàng)建臨時文件目錄（臨時目錄可在每次下載請求開始先進(jìn)行清空）；
將生成的Excel寫入本地臨時文件；
獲取Excel文件輸入流，獲取響應(yīng)的輸出流（response.getOutputStream();）;
調(diào)取公共方法傳入輸入輸出流即可。
二、pom依賴引入
<!-- pom相關(guān)依賴 -->
<poi.version>4.1.1</poi.version>
<itextpdf.version>5.5.13.2</itextpdf.version>
<!-- POI Excel-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>${poi.version}</version>
</dependency>
<!-- iText PDF -->
<dependency>
<groupId>com.itextpdf</groupId>
<artifactId>itextpdf</artifactId>
<version>${itextpdf.version}</version>
</dependency>
三、工具方法
package com.xxx.tool.util;
import cn.hutool.core.collection.CollUtil;
import com.itextpdf.text.*;
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.experimental.UtilityClass;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ooxml.POIXMLDocumentPart;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.xssf.usermodel.*;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Objects;
@UtilityClass
public class ExcelToPdfUtil {
public static void excelToPdf(String excelPath, String pdfPath, String excelSuffix) {
try (InputStream in = Files.newInputStream(Paths.get(excelPath));
OutputStream out = Files.newOutputStream(Paths.get(pdfPath))) {
ExcelToPdfUtil.excelToPdf(in, out, excelSuffix);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Excel轉(zhuǎn)PDF并寫入輸出流
*
* @param inStream Excel輸入流
* @param outStream PDF輸出流
* @param excelSuffix Excel類型 .xls 和 .xlsx
* @throws Exception 異常信息
*/
public static void excelToPdf(InputStream inStream, OutputStream outStream, String excelSuffix) throws Exception {
// 輸入流轉(zhuǎn)workbook，獲取sheet
Sheet sheet = getPoiSheetByFileStream(inStream, 0, excelSuffix);
// 獲取列寬度占比
float[] widths = getColWidth(sheet);
PdfPTable table = new PdfPTable(widths);
table.setWidthPercentage(100);
int colCount = widths.length;
//設(shè)置基本字體
BaseFont baseFont = BaseFont.createFont("C:\\Windows\\Fonts\\simsun.ttc,0", BaseFont.IDENTITY_H, BaseFont.EMBEDDED);
// 遍歷行
for (int rowIndex = sheet.getFirstRowNum(); rowIndex <= sheet.getLastRowNum(); rowIndex++) {
Row row = sheet.getRow(rowIndex);
if (Objects.isNull(row)) {
// 插入空對象
for (int i = 0; i < colCount; i++) {
table.addCell(createPdfPCell(null, 0, 13f, null));
}
} else {
// 遍歷單元格
for (int columnIndex = 0; (columnIndex < row.getLastCellNum() || columnIndex < colCount) && columnIndex > -1; columnIndex++) {
PdfPCell pCell = excelCellToPdfCell(sheet, row.getCell(columnIndex), baseFont);
// 是否合并單元格
if (isMergedRegion(sheet, rowIndex, columnIndex)) {
int[] span = getMergedSpan(sheet, rowIndex, columnIndex);
//忽略合并過的單元格
boolean mergedCell = span[0] == 1 && span[1] == 1;
if (mergedCell) {
continue;
}
pCell.setRowspan(span[0]);
pCell.setColspan(span[1]);
}
table.addCell(pCell);
}
}
}
// 初始化PDF文檔對象
createPdfTableAndWriteDocument(outStream, table);
}
/**
* 單元格轉(zhuǎn)換，poi cell 轉(zhuǎn)換為 itext cell
*
* @param sheet poi sheet頁
* @param excelCell poi 單元格
* @param baseFont 基礎(chǔ)字體
* @return com.itextpdf.text.pdf.PdfPCell
*/
private static PdfPCell excelCellToPdfCell(Sheet sheet, Cell excelCell, BaseFont baseFont) throws Exception {
if (Objects.isNull(excelCell)) {
return createPdfPCell(null, 0, 13f, null);
}
int rowIndex = excelCell.getRowIndex();
int columnIndex = excelCell.getColumnIndex();
// 圖片信息
List<PicturesInfo> infos = getAllPictureInfos(sheet, rowIndex, rowIndex, columnIndex, columnIndex, false);
PdfPCell pCell;
if (CollUtil.isNotEmpty(infos)) {
pCell = new PdfPCell(Image.getInstance(infos.get(0).getPictureData()));
} else {
Font excelFont = getExcelFont(sheet, excelCell);
//設(shè)置單元格字體
com.itextpdf.text.Font pdFont = new com.itextpdf.text.Font(baseFont, excelFont.getFontHeightInPoints(), excelFont.getBold() ? 1 : 0, BaseColor.BLACK);
Integer border = hasBorder(excelCell) ? null : 0;
String excelCellValue = getExcelCellValue(excelCell);
pCell = createPdfPCell(excelCellValue, border, excelCell.getRow().getHeightInPoints(), pdFont);
}
// 水平居中
pCell.setHorizontalAlignment(getHorAlign(excelCell.getCellStyle().getAlignment().getCode()));
// 垂直對齊
pCell.setVerticalAlignment(getVerAlign(excelCell.getCellStyle().getVerticalAlignment().getCode()));
return pCell;
}
/**
* 創(chuàng)建pdf文檔，并添加表格
*
* @param outStream 輸出流，目標(biāo)文檔
* @param table 表格
* @throws DocumentException 異常信息
*/
private static void createPdfTableAndWriteDocument(OutputStream outStream, PdfPTable table) throws DocumentException {
//設(shè)置pdf紙張大小 PageSize.A4 A4橫向
Document document = new Document(new RectangleReadOnly(842.0F, 595.0F));
PdfWriter.getInstance(document, outStream);
//設(shè)置頁邊距 寬
document.setMargins(10, 10, 10, 10);
document.open();
document.add(table);
document.close();
}
/**
* Excel文檔輸入流轉(zhuǎn)換為對應(yīng)的workbook及獲取對應(yīng)的sheet
*
* @param inputStream Excel文檔輸入流
* @param sheetNo sheet編號，默認(rèn)0 第一個sheet
* @param excelSuffix 文件類型 .xls和.xlsx
* @return poi sheet
* @throws IOException 異常
*/
public static Sheet getPoiSheetByFileStream(InputStream inputStream, int sheetNo, String excelSuffix) throws IOException {
Workbook workbook;
if (excelSuffix.endsWith(".xlsx")) {
workbook = new XSSFWorkbook(inputStream);
} else {
workbook = new HSSFWorkbook(inputStream);
}
return workbook.getSheetAt(sheetNo);
}
/**
* 創(chuàng)建itext pdf 單元格
*
* @param content 單元格內(nèi)容
* @param border 邊框
* @param minimumHeight 高度
* @param pdFont 字體
* @return pdf cell
*/
private static PdfPCell createPdfPCell(String content, Integer border, Float minimumHeight, com.itextpdf.text.Font pdFont) {
String contentValue = content == null ? "" : content;
com.itextpdf.text.Font pdFontNew = pdFont == null ? new com.itextpdf.text.Font() : pdFont;
PdfPCell pCell = new PdfPCell(new Phrase(contentValue, pdFontNew));
if (Objects.nonNull(border)) {
pCell.setBorder(border);
}
if (Objects.nonNull(minimumHeight)) {
pCell.setMinimumHeight(minimumHeight);
}
return pCell;
}
/**
* excel垂直對齊方式映射到pdf對齊方式
*/
private static int getVerAlign(int align) {
switch (align) {
case 2:
return com.itextpdf.text.Element.ALIGN_BOTTOM;
case 3:
return com.itextpdf.text.Element.ALIGN_TOP;
default:
return com.itextpdf.text.Element.ALIGN_MIDDLE;
}
}
/**
* excel水平對齊方式映射到pdf水平對齊方式
*/
private static int getHorAlign(int align) {
switch (align) {
case 1:
return com.itextpdf.text.Element.ALIGN_LEFT;
case 3:
return com.itextpdf.text.Element.ALIGN_RIGHT;
default:
return com.itextpdf.text.Element.ALIGN_CENTER;
}
}
/*============================================== POI獲取圖片及文本內(nèi)容工具方法 ==============================================*/
/**
* 獲取字體
*
* @param sheet excel 轉(zhuǎn)換的sheet頁
* @param cell 單元格
* @return 字體
*/
private static Font getExcelFont(Sheet sheet, Cell cell) {
// xls
if (sheet instanceof HSSFSheet) {
Workbook workbook = sheet.getWorkbook();
return ((HSSFCell) cell).getCellStyle().getFont(workbook);
}
// xlsx
return ((XSSFCell) cell).getCellStyle().getFont();
}
/**
* 判斷excel單元格是否有邊框
*/
private static boolean hasBorder(Cell excelCell) {
short top = excelCell.getCellStyle().getBorderTop().getCode();
short bottom = excelCell.getCellStyle().getBorderBottom().getCode();
short left = excelCell.getCellStyle().getBorderLeft().getCode();
short right = excelCell.getCellStyle().getBorderRight().getCode();
return top + bottom + left + right > 2;
}
/**
* 判斷單元格是否是合并單元格
*/
private static boolean isMergedRegion(Sheet sheet, int row, int column) {
int sheetMergeCount = sheet.getNumMergedRegions();
for (int i = 0; i < sheetMergeCount; i++) {
CellRangeAddress range = sheet.getMergedRegion(i);
int firstColumn = range.getFirstColumn();
int lastColumn = range.getLastColumn();
int firstRow = range.getFirstRow();
int lastRow = range.getLastRow();
if (row >= firstRow && row <= lastRow) {
if (column >= firstColumn && column <= lastColumn) {
return true;
}
}
}
return false;
}
/**
* 計算合并單元格合并的跨行跨列數(shù)
*/
private static int[] getMergedSpan(Sheet sheet, int row, int column) {
int sheetMergeCount = sheet.getNumMergedRegions();
int[] span = {1, 1};
for (int i = 0; i < sheetMergeCount; i++) {
CellRangeAddress range = sheet.getMergedRegion(i);
int firstColumn = range.getFirstColumn();
int lastColumn = range.getLastColumn();
int firstRow = range.getFirstRow();
int lastRow = range.getLastRow();
if (firstColumn == column && firstRow == row) {
span[0] = lastRow - firstRow + 1;
span[1] = lastColumn - firstColumn + 1;
break;
}
}
return span;
}
/**
* 獲取excel中每列寬度的占比
*/
private static float[] getColWidth(Sheet sheet) {
int rowNum = getMaxColRowNum(sheet);
Row row = sheet.getRow(rowNum);
int cellCount = row.getPhysicalNumberOfCells();
int[] colWidths = new int[cellCount];
int sum = 0;
for (int i = row.getFirstCellNum(); i < cellCount; i++) {
Cell cell = row.getCell(i);
if (cell != null) {
colWidths[i] = sheet.getColumnWidth(i);
sum += sheet.getColumnWidth(i);
}
}
float[] colWidthPer = new float[cellCount];
for (int i = row.getFirstCellNum(); i < cellCount; i++) {
colWidthPer[i] = (float) colWidths[i] / sum * 100;
}
return colWidthPer;
}
/**
* 獲取excel中列數(shù)最多的行號
*/
private static int getMaxColRowNum(Sheet sheet) {
int rowNum = 0;
int maxCol = 0;
for (int r = sheet.getFirstRowNum(); r < sheet.getPhysicalNumberOfRows(); r++) {
Row row = sheet.getRow(r);
if (row != null && maxCol < row.getPhysicalNumberOfCells()) {
maxCol = row.getPhysicalNumberOfCells();
rowNum = r;
}
}
return rowNum;
}
/**
* poi 根據(jù)單元格類型獲取單元格內(nèi)容
*
* @param excelCell poi單元格
* @return 單元格內(nèi)容文本
*/
public static String getExcelCellValue(Cell excelCell) {
if (excelCell == null) {
return "";
}
// 判斷數(shù)據(jù)的類型
CellType cellType = excelCell.getCellType();
if (cellType == CellType.STRING) {
return excelCell.getStringCellValue();
}
if (cellType == CellType.BOOLEAN) {
return String.valueOf(excelCell.getBooleanCellValue());
}
if (cellType == CellType.FORMULA) {
return excelCell.getCellFormula();
}
if (cellType == CellType.NUMERIC) {
//short s = excelCell.getCellStyle().getDataFormat();
if (DateUtil.isCellDateFormatted(excelCell)) {// 處理日期格式、時間格式
SimpleDateFormat sdf;
// 驗證short值
if (excelCell.getCellStyle().getDataFormat() == 14) {
sdf = new SimpleDateFormat("yyyy/MM/dd");
} else if (excelCell.getCellStyle().getDataFormat() == 21) {
sdf = new SimpleDateFormat("HH:mm:ss");
} else if (excelCell.getCellStyle().getDataFormat() == 22) {
sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
} else {
throw new RuntimeException("日期格式錯誤!!!");
}
Date date = excelCell.getDateCellValue();
return sdf.format(date);
} else if (excelCell.getCellStyle().getDataFormat() == 0) {
//處理數(shù)值格式
DataFormatter formatter = new DataFormatter();
return formatter.formatCellValue(excelCell);
}
}
if (cellType == CellType.ERROR) {
return "非法字符";
}
return "";
}
/**
* 獲取sheet內(nèi)的所有圖片信息
*
* @param sheet sheet表
* @param onlyInternal 單元格內(nèi)部
* @return 照片集合
* @throws Exception 異常
*/
public static List<PicturesInfo> getAllPictureInfos(Sheet sheet, boolean onlyInternal) throws Exception {
return getAllPictureInfos(sheet, null, null, null, null, onlyInternal);
}
/**
* 根據(jù)sheet和單元格信息獲取圖片
*
* @param sheet sheet表
* @param minRow 最小行
* @param maxRow 最大行
* @param minCol 最小列
* @param maxCol 最大列
* @param onlyInternal 是否內(nèi)部
* @return 圖片集合
* @throws Exception 異常
*/
public static List<PicturesInfo> getAllPictureInfos(Sheet sheet, Integer minRow, Integer maxRow, Integer minCol,
Integer maxCol, boolean onlyInternal) throws Exception {
if (sheet instanceof HSSFSheet) {
return getXLSAllPictureInfos((HSSFSheet) sheet, minRow, maxRow, minCol, maxCol, onlyInternal);
} else if (sheet instanceof XSSFSheet) {
return getXLSXAllPictureInfos((XSSFSheet) sheet, minRow, maxRow, minCol, maxCol, onlyInternal);
} else {
throw new Exception("未處理類型，沒有為該類型添加：GetAllPicturesInfos()擴(kuò)展方法！");
}
}
private static List<PicturesInfo> getXLSAllPictureInfos(HSSFSheet sheet, Integer minRow, Integer maxRow,
Integer minCol, Integer maxCol, Boolean onlyInternal) {
List<PicturesInfo> picturesInfoList = new ArrayList<>();
HSSFShapeContainer shapeContainer = sheet.getDrawingPatriarch();
if (shapeContainer == null) {
return picturesInfoList;
}
List<HSSFShape> shapeList = shapeContainer.getChildren();
for (HSSFShape shape : shapeList) {
if (shape instanceof HSSFPicture && shape.getAnchor() instanceof HSSFClientAnchor) {
HSSFPicture picture = (HSSFPicture) shape;
HSSFClientAnchor anchor = (HSSFClientAnchor) shape.getAnchor();
if (isInternalOrIntersect(minRow, maxRow, minCol, maxCol, anchor.getRow1(), anchor.getRow2(),
anchor.getCol1(), anchor.getCol2(), onlyInternal)) {
HSSFPictureData pictureData = picture.getPictureData();
picturesInfoList.add(new PicturesInfo()
.setMinRow(anchor.getRow1())
.setMaxRow(anchor.getRow2())
.setMinCol(anchor.getCol1())
.setMaxCol(anchor.getCol2())
.setPictureData(pictureData.getData())
.setExt(pictureData.getMimeType()));
}
}
}
return picturesInfoList;
}
private static List<PicturesInfo> getXLSXAllPictureInfos(XSSFSheet sheet, Integer minRow, Integer maxRow,
Integer minCol, Integer maxCol, Boolean onlyInternal) {
List<PicturesInfo> picturesInfoList = new ArrayList<>();
List<POIXMLDocumentPart> documentPartList = sheet.getRelations();
for (POIXMLDocumentPart documentPart : documentPartList) {
if (documentPart instanceof XSSFDrawing) {
XSSFDrawing drawing = (XSSFDrawing) documentPart;
List<XSSFShape> shapes = drawing.getShapes();
for (XSSFShape shape : shapes) {
if (shape instanceof XSSFPicture) {
XSSFPicture picture = (XSSFPicture) shape;
XSSFClientAnchor anchor = picture.getPreferredSize();
if (isInternalOrIntersect(minRow, maxRow, minCol, maxCol, anchor.getRow1(), anchor.getRow2(),
anchor.getCol1(), anchor.getCol2(), onlyInternal)) {
XSSFPictureData pictureData = picture.getPictureData();
picturesInfoList.add(new PicturesInfo()
.setMinRow(anchor.getRow1())
.setMaxRow(anchor.getRow2())
.setMinCol(anchor.getCol1())
.setMaxCol(anchor.getCol2())
.setPictureData(pictureData.getData())
.setExt(pictureData.getMimeType()));
}
}
}
}
}
return picturesInfoList;
}
private static boolean isInternalOrIntersect(Integer rangeMinRow, Integer rangeMaxRow, Integer rangeMinCol,
Integer rangeMaxCol, int pictureMinRow, int pictureMaxRow, int pictureMinCol, int pictureMaxCol,
Boolean onlyInternal) {
int _rangeMinRow = rangeMinRow == null ? pictureMinRow : rangeMinRow;
int _rangeMaxRow = rangeMaxRow == null ? pictureMaxRow : rangeMaxRow;
int _rangeMinCol = rangeMinCol == null ? pictureMinCol : rangeMinCol;
int _rangeMaxCol = rangeMaxCol == null ? pictureMaxCol : rangeMaxCol;
if (onlyInternal) {
return (_rangeMinRow <= pictureMinRow && _rangeMaxRow >= pictureMaxRow && _rangeMinCol <= pictureMinCol
&& _rangeMaxCol >= pictureMaxCol);
} else {
return ((Math.abs(_rangeMaxRow - _rangeMinRow) + Math.abs(pictureMaxRow - pictureMinRow) >= Math
.abs(_rangeMaxRow + _rangeMinRow - pictureMaxRow - pictureMinRow))
&& (Math.abs(_rangeMaxCol - _rangeMinCol) + Math.abs(pictureMaxCol - pictureMinCol) >= Math
.abs(_rangeMaxCol + _rangeMinCol - pictureMaxCol - pictureMinCol)));
}
}
/**
* 圖片基本信息
*/
private class PicturesInfo {
private int minRow;
private int maxRow;
private int minCol;
private int maxCol;
private String ext;
private byte[] pictureData;
public PicturesInfo() {
}
public byte[] getPictureData() {
return pictureData;
}
public PicturesInfo setPictureData(byte[] pictureData) {
this.pictureData = pictureData;
return this;
}
public int getMinRow() {
return minRow;
}
public PicturesInfo setMinRow(int minRow) {
this.minRow = minRow;
return this;
}
public int getMaxRow() {
return maxRow;
}
public PicturesInfo setMaxRow(int maxRow) {
this.maxRow = maxRow;
return this;
}
public int getMinCol() {
return minCol;
}
public PicturesInfo setMinCol(int minCol) {
this.minCol = minCol;
return this;
}
public int getMaxCol() {
return maxCol;
}
public PicturesInfo setMaxCol(int maxCol) {
this.maxCol = maxCol;
return this;
}
public String getExt() {
return ext;
}
public PicturesInfo setExt(String ext) {
this.ext = ext;
return this;
}
}
}四、引文
java高效實現(xiàn)excel轉(zhuǎn)pdf，支持excel中帶有圖片的轉(zhuǎn)換（支持.xls和.xlsx兩種格式）
Java Poi 讀取excel 對所有類型進(jìn)行處理
以上就是Java使用itextpdf實現(xiàn)Excel轉(zhuǎn)PDF的詳細(xì)內(nèi)容，更多關(guān)于Java Excel轉(zhuǎn)PDF的資料請關(guān)注腳本之家其它相關(guān)文章！
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