我想用java将文本文件转换为TIF文件，我只能使用opensourec第3部分jar。 可以任何人建议任何可用的实用程序/罐？ 我已经看到Aspose有能力，但我正在寻找开源，我尝试了pdfbox，但没有多大帮助。
Aspose这样做：
// Read whole txt file into string.
string txt = File.ReadAllText("in.txt");
// Insert string into document.
DocumentBuilder builder = new DocumentBuilder();
builder.Write(txt);
// Save output.
builder.Document.Save("out.pdf");
builder.Document.Save("out.tiff");
答案 0 :(得分：1)
我可以这样做： 1.阅读.txt文件并使用pdfbox从中创建pdf 2.使用pdfbox将pdf转换为TIF图像。 下面是代码snipet
使用的jar; 1.pdfbox-APP-2.0.0.jar 2.xmpbox-1.8.9.jar 3.levigo-JBIG2-的ImageIO-1.6.1.jar 4.jai_imageio-1.1.jar 5.jai_core-1.1.3.jar 6.jai_codec-1.1.3.jar 7.commons-测井1.1.3.jar
private static final float A4_SIZE_UNIT=2.8346457f;
public static final int FAILURE = 2;
public static final int BLANK = 0;
public static final int NOTBLANK = 1;
// value where we can consider that this is a blank image
// can be much higher depending of the TIF source
// (ex. scanner or fax)
public static final int BLANK_THRESHOLD = 1000;
public static final int MAXIMUM_WIDTH = 500;
public static void convertTextToTif(String fileName) throws IOException {
String filenmewithoutExtn=fileName.substring(0, fileName.lastIndexOf("."));
BufferedReader br = null;
String sCurrentLine;
PdfConverter t=new PdfConverter();
PdfConverter.PageMetaData pmdata=t.new PageMetaData();
pmdata.setLineCount(0);
pmdata.setyCount(820);
PDDocument document = new PDDocument();
PDFont font = PDType1Font.HELVETICA;
//For Each Page:
PDRectangle a4Size=new PDRectangle(210*A4_SIZE_UNIT,297*A4_SIZE_UNIT);
PDPage page = new PDPage(a4Size);
PDPageContentStream contentStream = new PDPageContentStream(document, page);
contentStream.setFont(font, 10);
br = new BufferedReader(new FileReader(fileName));
while ((sCurrentLine = br.readLine()) != null ) {
System.out.println(sCurrentLine);
sCurrentLine=removeUnicode(sCurrentLine);
writeToPdf(sCurrentLine,contentStream,pmdata);
if ((pmdata.getLineCount()%52)==0){
pmdata.setLineCount(0);
pmdata.setyCount(820);
contentStream.close();
document.addPage(page);
page = new PDPage(a4Size);
contentStream = new PDPageContentStream(document, page);
contentStream.setFont(font, 10);
if(pmdata.getLine()!=null){
writeToPdf(pmdata.getLine(),contentStream,pmdata);
}
}
}
contentStream.close();
document.addPage(page);
//After All Content is written:
document.save(filenmewithoutExtn+".pdf");
document.close();
if (br != null)br.close();
convertPDFtoTiff(filenmewithoutExtn+".pdf");
File sFile = new File(filenmewithoutExtn+".pdf");
sFile.delete();
}
public static PdfConverter.PageMetaData writeToPdf(String line,PDPageContentStream contentStream,PdfConverter.PageMetaData pmdata) throws IOException{
if( pmdata.getLineCount()!=0 && (pmdata.getLineCount()%52)==0)
{
pmdata.setLine(line);
return pmdata;
}
if(line.length()>95){
String pageLenghthString=line.substring(0,95);
int lastSpaceIndex=pageLenghthString.lastIndexOf(" ");
String lineToPrint=null;
if(lastSpaceIndex>-1){
lineToPrint=line.substring(0, lastSpaceIndex);
}else{
lineToPrint=line;
}
contentStream.beginText();
contentStream.moveTextPositionByAmount(20, pmdata.getyCount());
contentStream.drawString(lineToPrint);
contentStream.endText();
pmdata.setLineCount(pmdata.getLineCount()+1);
pmdata.setyCount(pmdata.getyCount()-15);
if(lastSpaceIndex>-1){
writeToPdf(line.substring(lastSpaceIndex).trim(),contentStream,pmdata);
}else{
writeToPdf(line.substring(95).trim(),contentStream,pmdata);
}
}else{
pmdata.setLineCount(pmdata.getLineCount()+1);
contentStream.beginText();
contentStream.moveTextPositionByAmount(20, pmdata.getyCount());
pmdata.setyCount(pmdata.getyCount()-15);
contentStream.drawString(line);
contentStream.endText();
}
return pmdata;
}
public class PageMetaData{
private Integer lineCount;
private Integer yCount;
private String line;
public Integer getLineCount() {
return lineCount;
}
public void setLineCount(Integer lineCount) {
this.lineCount = lineCount;
}
public Integer getyCount() {
return yCount;
}
public void setyCount(Integer yCount) {
this.yCount = yCount;
}
public String getLine() {
return line;
}
public void setLine(String line) {
this.line = line;
}
public static void convertPDFtoTiff(String fileName) throws IOException{
System.out.println("Document convertion started");
String sourceDir = fileName; // Pdf files are read from this folder
String filenameWithoutExtn=fileName.substring(0, fileName.lastIndexOf("."));
String destinationDir = filenameWithoutExtn+".tif"; // converted images from pdf document are saved here
File logFile =null;
File destinationFile=null;
ImageOutputStream ios=null;
PDDocument document=null;
ImageWriter writer=null;
BufferedWriter fileWriter = null;
try{
File sourceFile =new File(sourceDir);
logFile = new File(sourceDir.substring(0, sourceDir.lastIndexOf("\\"))+"/javalog.txt");
fileWriter = new BufferedWriter(new FileWriter(logFile));
destinationFile = new File(destinationDir);
ios = ImageIO.createImageOutputStream(destinationFile);
writer = ImageIO.getImageWritersByFormatName("tif").next();
writer.setOutput(ios);
ImageWriteParam param = writer.getDefaultWriteParam();
param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
param.setCompressionType("JPEG");
param.setCompressionQuality(.5f);
document = PDDocument.load(sourceFile);
PDFRenderer renderer=new PDFRenderer(document);
int totalPages=document.getNumberOfPages();
//System.out.println("Total pages to be converted -> "+ totalPages);
fileWriter.write("Total pages to be converted -> "+ totalPages);
int pageNumber = 1;
for (int count=0;count<totalPages;count++) {
BufferedImage image = renderer.renderImageWithDPI(count, 300);
BufferedImage blackAndWhiteRotated=null;
BufferedImage blackAndWhite = new BufferedImage(
image.getHeight(null), image.getHeight(null),
BufferedImage.TYPE_BYTE_GRAY);
Graphics2D g2 = blackAndWhite.createGraphics();
//g2.translate(170, 0);
g2.rotate(90.0 * Math.PI / 180.0,
blackAndWhite.getWidth()/2.0 , blackAndWhite
.getHeight() /2.0);
g2.drawImage(image, 0, 0, null);
//g2.r
//g2.rotate(45);
AffineTransform identity = new AffineTransform();
IIOImage img = new IIOImage(blackAndWhite, null, null);
if(pageNumber==1){
writer.write(null, img, param);
}
else{
writer.writeInsert(-1, img, param);
}
image.flush();
g2.dispose();
pageNumber++;
}
fileWriter.write("Document converted successfully");
//System.out.println("Image Created -> "+ destinationFile.getName());
}
catch(Exception e){
fileWriter.write(e.toString());
e.printStackTrace();
}finally{
fileWriter.close();
document.close();
ios.flush();
ios.close();
writer.dispose();
}
//System.out.println("Converted Images are saved at -> "+ destinationFile.getAbsolutePath());
System.out.println("Document converted successfully");
}
/**
* Creates an Image from a byte array
* @param data
* @return Image
* @throws IOException
* @throws Exception
*/
public static Image load(byte[] data) throws IOException {
Image image = null;
SeekableStream stream;
String[] names =null;
ImageDecoder dec=null;
RenderedImage im=null;
try {
//Create data stream from byte array
stream = new ByteArraySeekableStream(data);
names = ImageCodec.getDecoderNames(stream);
//Create image decoder
if(names!=null){
dec =
ImageCodec.createImageDecoder(names[0], stream, null);
im = dec.decodeAsRenderedImage();
}else{
return null;
}
} catch (IOException e) {
throw e;
}
//create image
image = PlanarImage.wrapRenderedImage(im).getAsBufferedImage();
// scale-down the image , maximum width : 500 px
// to preserve memory
Image imageScaled =
image.getScaledInstance(MAXIMUM_WIDTH, -1, Image.SCALE_SMOOTH);
return imageScaled;
}
/**
* Converts an Image to a BufferedImage
* @param im une Image
* @return BufferedImage
*/
public static BufferedImage imageToBufferedImage(Image im) {
BufferedImage bi = new BufferedImage
(im.getWidth(null),im.getHeight(null),BufferedImage.TYPE_INT_RGB);
Graphics bg = bi.getGraphics();
bg.drawImage(im, 0, 0, null);
bg.dispose();
return bi;
}