使用Java实现文件转PDF的工具类，支持多种常见格式的转换。
根据自己的使用场景决定保留对应的方法。
1.将图片流保存到文件
2.将图片转换为PDF格式文件
3.将word文件转换为PDF格式文件
4.将excel文件转换为PDF格式文件
5.设置打印的sheet，自动拉伸比例
6.隐藏workbook中不需要的sheet页
7.将powerpoint文件转换为PDF格式文件
8.将txt文件转换为PDF格式文件
public class PDFConvertUtil {
/**
* 将图片流直接保存到文件
*
* @param inputStream 图片文件流
* @param savePath 保存路径
* @return 是否成功
*/
public static boolean saveImage(InputStream inputStream, String savePath) {
try (FileOutputStream outputStream = new FileOutputStream(savePath)) {
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
outputStream.write(buffer, 0, bytesRead);
}
return true;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
/**
* 将图片转换为PDF格式文件
*
* @param inputStream 图片文件流
* @param savePath PDF文件保存路径
* @return
*/
public static boolean imgToPDF(InputStream inputStream, String savePath) {
Document document = null;
try {
// 将文件流转换为字节流，便于格式转换
BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
byte[] bytes = new byte[1024];
int length = 0;
while (-1 != (length = bufferedInputStream.read(bytes))) {
byteArrayOutputStream.write(bytes, 0, length);
}
// 处理img图片
Image image = Image.getInstance(byteArrayOutputStream.toByteArray());
//图片的原始宽高
float height = image.getHeight();
float width = image.getWidth();
Rectangle pageSize = new Rectangle(width,height);
File file = new File(savePath);
FileOutputStream outputStream = new FileOutputStream(file);
// 创建文档,设置PDF页面的大小 A2-A9, 个人觉得A3最合适
document = new Document(pageSize, 0, 0, 0, 0);
// 新建pdf文档,具体逻辑看.getInstance方法
PdfWriter.getInstance(document, outputStream);
document.open();
document.newPage();
image.setAlignment(Image.MIDDLE);
//image.setRotationDegrees(90); //旋转
// 将图片放入文档中，完成pdf转换
document.add(image);
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
try {
if (document != null) {
document.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
return true;
}
/**
* 将word文件转换为PDF格式文件
*
* @param inputStream word文件流
* @param savePath PDF文件保存路径
* @return .
*/
public static boolean wordToPDF(InputStream inputStream, String savePath) {
// 验证License 若不验证则转化出的pdf文档会有水印产生
if (!getLicense("word")) {
return false;
}
File file = new File(savePath);
FileOutputStream outputStream = null;
try {
outputStream = new FileOutputStream(file);
// 将源文件保存在com.aspose.words.Document中，具体的转换格式依靠里面的save方法
com.aspose.words.Document doc = new com.aspose.words.Document(inputStream);
// 全面支持DOC, DOCX, OOXML, RTF HTML, OpenDocument, PDF,EPUB, XPS, SWF 相互转换
doc.save(outputStream, SaveFormat.PDF);
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
if (outputStream != null) {
try {
outputStream.flush();
outputStream.close();
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return true;
}
/**
* 将excel文件转换为PDF格式文件
*
* @param inputStream excel文件流
* @param savePath PDF文件保存路径
* @return
*/
public static boolean excelToPDF(InputStream inputStream, String savePath) {
// 验证License 若不验证则转化出的pdf文档会有水印产生
if (!getLicense("excel")) {
return false;
}
File file = new File(savePath);
FileOutputStream outputStream = null;
try {
outputStream = new FileOutputStream(file);
Workbook wb = new Workbook(inputStream);// 原始excel路径
PdfSaveOptions pdfSaveOptions = new PdfSaveOptions();
pdfSaveOptions.setOnePagePerSheet(true);
//开启以下注释的配置，则会将宽表格拆断并分页
//pdfSaveOptions.setOnePagePerSheet(false);
//int[] autoDrawSheets = {3};
//当excel中对应的sheet页宽度太大时，在PDF中会拆断并分页。此处等比缩放。
//autoDraw(wb, autoDrawSheets);
int[] showSheets = {0};
//隐藏workbook中不需要的sheet页。
printSheetPage(wb, showSheets);
wb.save(outputStream, pdfSaveOptions);
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
if (outputStream != null) {
try {
outputStream.flush();
outputStream.close();
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return true;
}
/**
* 设置打印的sheet 自动拉伸比例
*
* @param wb
* @param page 自动拉伸的页的sheet数组
*/
private static void autoDraw(Workbook wb, int[] page) {
if (null != page && page.length > 0) {
for (int i = 0; i < page.length; i++) {
wb.getWorksheets().get(i).getHorizontalPageBreaks().clear();
wb.getWorksheets().get(i).getVerticalPageBreaks().clear();
}
}
}
/**
* 隐藏workbook中不需要的sheet页。
*
* @param wb
* @param page 显示页的sheet数组
*/
private static void printSheetPage(Workbook wb, int[] page) {
for (int i = 1; i < wb.getWorksheets().getCount(); i++) {
wb.getWorksheets().get(i).setVisible(false);
}
if (null == page || page.length == 0) {
wb.getWorksheets().get(0).setVisible(true);
} else {
for (int i = 0; i < page.length; i++) {
wb.getWorksheets().get(i).setVisible(true);
}
}
}
/**
* 将powerpoint文件转换为PDF格式文件
*
* @param inputStream powerpoint文件流
* @param savePath PDF文件保存路径
* @return
*/
public static boolean powerpointToPDF(InputStream inputStream, String savePath) {
// 验证License
if (!getLicense("ppt")) {
return false;
}
try {
//输入ppt文件流
Presentation pres = new Presentation(inputStream);
pres.save(savePath, com.aspose.slides.SaveFormat.Pdf);
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
try {
inputStream.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
private static boolean getLicense(String type) {
boolean result = false;
try {
String s = "<License><Data><Products><Product>Aspose.Total for Java</Product><Product>Aspose.Words for Java</Product></Products><EditionType>Enterprise</EditionType><SubscriptionExpiry>20991231</SubscriptionExpiry><LicenseExpiry>20991231</LicenseExpiry><SerialNumber>8bfe198c-7f0c-4ef8-8ff0-acc3237bf0d7</SerialNumber></Data><Signature>sNLLKGMUdF0r8O1kKilWAGdgfs2BvJb/2Xp8p5iuDVfZXmhppo+d0Ran1P9TKdjV4ABwAgKXxJ3jcQTqE/2IRfqwnPf8itN8aFZlV3TJPYeD3yWE7IT55Gz6EijUpC7aKeoohTb4w2fpox58wWoF3SNp6sK6jDfiAUGEHYJ9pjU=</Signature></License>";
ByteArrayInputStream is = new ByteArrayInputStream(s.getBytes());
switch (type) {
case "word":
com.aspose.words.License aposeLicWord = new com.aspose.words.License();
aposeLicWord.setLicense(is);
break;
case "excel":
com.aspose.cells.License aposeLicExcel = new com.aspose.cells.License();
aposeLicExcel.setLicense(is);
break;
case "ppt":
case "pptx":
com.aspose.slides.License aposeLicPowerPoint = new com.aspose.slides.License();
aposeLicPowerPoint.setLicense(is);
break;
}
result = true;
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* 将txt文件转换为PDF格式文件
*
* @param inputStream txt文件流
* @param savePath PDF文件保存路径
* @return
*/
public static boolean txtToPDF(InputStream inputStream, String savePath) {
File tempDir = new File(SystemCache.txtTempDir);
if (!tempDir.exists()) {
tempDir.mkdirs();
}
String tempPath = SystemCache.txtTempDir + savePath.substring(savePath.lastIndexOf(File.separator), savePath.lastIndexOf(".")) + ".txt";
File tempFile = new File(tempPath);
try {
FileUtils.copyInputStreamToFile(inputStream, tempFile);
String charset = getCharset(tempFile);
return txt2PDF(tempPath, savePath, charset);
} catch (IOException e) {
e.printStackTrace();
return false;
} finally {
try {
FileUtils.delete(tempFile);
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static String getCharset(File file) {
String charset = "GBK";
byte[] first3Bytes = new byte[3];
try {
boolean checked = false;
InputStream is = new FileInputStream(file);
int read = is.read(first3Bytes, 0, 3);
if (read == -1)
return charset;
if (first3Bytes[0] == (byte) 0xFF && first3Bytes[1] == (byte) 0xFE) {
charset = "UTF-16LE";
checked = true;
} else if (first3Bytes[0] == (byte) 0xFE
&& first3Bytes[1] == (byte) 0xFF) {
charset = "UTF-16BE";
checked = true;
} else if (first3Bytes[0] == (byte) 0xEF
&& first3Bytes[1] == (byte) 0xBB
&& first3Bytes[2] == (byte) 0xBF) {
charset = "UTF-8";
checked = true;
} else if (first3Bytes[0] == (byte) 0xA
&& first3Bytes[1] == (byte) 0x5B
&& first3Bytes[2] == (byte) 0x30) {
charset = "UTF-8";
checked = true;
} else if (first3Bytes[0] == (byte) 0xD
&& first3Bytes[1] == (byte) 0xA
&& first3Bytes[2] == (byte) 0x5B) {
charset = "GBK";
checked = true;
} else if (first3Bytes[0] == (byte) 0x5B
&& first3Bytes[1] == (byte) 0x54
&& first3Bytes[2] == (byte) 0x49) {
charset = "windows-1251";
checked = true;
}
InputStream istmp = new FileInputStream(file);
if (!checked) {
int loc = 0;
while ((read = istmp.read()) != -1) {
loc++;
if (read >= 0xF0)
break;
if (0x80 <= read && read <= 0xBF)
break;
if (0xC0 <= read && read <= 0xDF) {
read = istmp.read();
if (0x80 <= read && read <= 0xBF)
continue;
else
break;
} else if (0xE0 <= read && read <= 0xEF) {
read = istmp.read();
if (0x80 <= read && read <= 0xBF) {
read = istmp.read();
if (0x80 <= read && read <= 0xBF) {
charset = "UTF-8";
break;
} else
break;
} else
break;
}
}
}
is.close();
istmp.close();
} catch (Exception e) {
e.printStackTrace();
}
return charset;
}
/**
* 将txt文件转换为PDF格式文件
*
* @param sourcePath txt文件路径
* @param savePath PDF文件保存路径
* @param charset txt文件编码格式
* @return
*/
public static boolean txt2PDF(String sourcePath, String savePath, String charset) {
Document document = null;
PdfWriter writer = null;
try {
FontFactoryImp fontFactoryImp = new FontFactoryImp();
fontFactoryImp.registerDirectories();
com.itextpdf.text.Font font = fontFactoryImp.getFont("宋体", BaseFont.IDENTITY_H, BaseFont.EMBEDDED, 16, Font.UNDEFINED, null);
File file = new File(savePath);
FileOutputStream outputStream = new FileOutputStream(file);
com.itextpdf.text.Rectangle rectangle = new com.itextpdf.text.Rectangle(PageSize.A4.rotate());
document = new Document(rectangle);
writer = PdfWriter.getInstance(document, outputStream);
document.open();
Paragraph paragraph = new Paragraph();
paragraph.setFont(font);
String fileToString = FileUtils.readFileToString(new File(sourcePath), charset);
paragraph.add(fileToString);
document.add(paragraph);
document.close();
} catch (Exception e) {
e.printStackTrace();
return false;
} finally {
if (document != null) {
document.close();
}
if (writer != null) {
writer.close();
}
}
return true;
}
}
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