Question

我正在使用Pdfbox使用Java生成PDF文件。问题是当我在文档中添加长文本内容时，它无法正确显示。只显示其中的一部分。这也是一行。

我希望文字分为多行。

我的代码如下：

PDPageContentStream pdfContent=new PDPageContentStream(pdfDocument, pdfPage, true, true);

pdfContent.beginText();
pdfContent.setFont(pdfFont, 11);
pdfContent.moveTextPositionByAmount(30,750);            
pdfContent.drawString("I am trying to create a PDF file with a lot of text contents in the document. I am using PDFBox");
pdfContent.endText();

我的输出：

This is my output file

Answer 1

添加到Mark的答案您可能想知道在哪里拆分长字符串。您可以使用PDFont方法getStringWidth。

将所有内容组合在一起就可以获得类似的内容（根据PDFBox版本的不同而略有不同）：

PDFBox 1.8.x

PDDocument doc = null;
try
{
    doc = new PDDocument();
    PDPage page = new PDPage();
    doc.addPage(page);
    PDPageContentStream contentStream = new PDPageContentStream(doc, page);

    PDFont pdfFont = PDType1Font.HELVETICA;
    float fontSize = 25;
    float leading = 1.5f * fontSize;

    PDRectangle mediabox = page.findMediaBox();
    float margin = 72;
    float width = mediabox.getWidth() - 2*margin;
    float startX = mediabox.getLowerLeftX() + margin;
    float startY = mediabox.getUpperRightY() - margin;

    String text = "I am trying to create a PDF file with a lot of text contents in the document. I am using PDFBox"; 
    List<String> lines = new ArrayList<String>();
    int lastSpace = -1;
    while (text.length() > 0)
    {
        int spaceIndex = text.indexOf(' ', lastSpace + 1);
        if (spaceIndex < 0)
            spaceIndex = text.length();
        String subString = text.substring(0, spaceIndex);
        float size = fontSize * pdfFont.getStringWidth(subString) / 1000;
        System.out.printf("'%s' - %f of %f\n", subString, size, width);
        if (size > width)
        {
            if (lastSpace < 0)
                lastSpace = spaceIndex;
            subString = text.substring(0, lastSpace);
            lines.add(subString);
            text = text.substring(lastSpace).trim();
            System.out.printf("'%s' is line\n", subString);
            lastSpace = -1;
        }
        else if (spaceIndex == text.length())
        {
            lines.add(text);
            System.out.printf("'%s' is line\n", text);
            text = "";
        }
        else
        {
            lastSpace = spaceIndex;
        }
    }

    contentStream.beginText();
    contentStream.setFont(pdfFont, fontSize);
    contentStream.moveTextPositionByAmount(startX, startY);            
    for (String line: lines)
    {
        contentStream.drawString(line);
        contentStream.moveTextPositionByAmount(0, -leading);
    }
    contentStream.endText(); 
    contentStream.close();

    doc.save("break-long-string.pdf");
}
finally
{
    if (doc != null)
    {
        doc.close();
    }
}

（对于PDFBox 1.8.x，BreakLongString.java测试testBreakString）

PDFBox 2.0.x

PDDocument doc = null;
try
{
    doc = new PDDocument();
    PDPage page = new PDPage();
    doc.addPage(page);
    PDPageContentStream contentStream = new PDPageContentStream(doc, page);

    PDFont pdfFont = PDType1Font.HELVETICA;
    float fontSize = 25;
    float leading = 1.5f * fontSize;

    PDRectangle mediabox = page.getMediaBox();
    float margin = 72;
    float width = mediabox.getWidth() - 2*margin;
    float startX = mediabox.getLowerLeftX() + margin;
    float startY = mediabox.getUpperRightY() - margin;

    String text = "I am trying to create a PDF file with a lot of text contents in the document. I am using PDFBox"; 
    List<String> lines = new ArrayList<String>();
    int lastSpace = -1;
    while (text.length() > 0)
    {
        int spaceIndex = text.indexOf(' ', lastSpace + 1);
        if (spaceIndex < 0)
            spaceIndex = text.length();
        String subString = text.substring(0, spaceIndex);
        float size = fontSize * pdfFont.getStringWidth(subString) / 1000;
        System.out.printf("'%s' - %f of %f\n", subString, size, width);
        if (size > width)
        {
            if (lastSpace < 0)
                lastSpace = spaceIndex;
            subString = text.substring(0, lastSpace);
            lines.add(subString);
            text = text.substring(lastSpace).trim();
            System.out.printf("'%s' is line\n", subString);
            lastSpace = -1;
        }
        else if (spaceIndex == text.length())
        {
            lines.add(text);
            System.out.printf("'%s' is line\n", text);
            text = "";
        }
        else
        {
            lastSpace = spaceIndex;
        }
    }

    contentStream.beginText();
    contentStream.setFont(pdfFont, fontSize);
    contentStream.newLineAtOffset(startX, startY);
    for (String line: lines)
    {
        contentStream.showText(line);
        contentStream.newLineAtOffset(0, -leading);
    }
    contentStream.endText(); 
    contentStream.close();

    doc.save(new File(RESULT_FOLDER, "break-long-string.pdf"));
}
finally
{
    if (doc != null)
    {
        doc.close();
    }
}

（对于PDFBox 2.0.x，BreakLongString.java测试testBreakString）

结果

Screenshot of the result PDF displayed in Acrobat Reader

这看起来像预期的那样。

当然，有许多改进，但这应该说明如何做。

添加无条件换行符

在评论中，aleskv问道：

如果字符串中有\ n，你可以添加换行符吗？

通过首先将字符串拆分为'\ n'字符，然后迭代拆分结果，可以轻松地将解决方案扩展为无条件中断换行符。

E.g。如果不是上面的长字符串

String text = "I am trying to create a PDF file with a lot of text contents in the document. I am using PDFBox";

您希望使用嵌入的新行字符来处理更长的字符串

String textNL = "I am trying to create a PDF file with a lot of text contents in the document. I am using PDFBox.\nFurthermore, I have added some newline characters to the string at which lines also shall be broken.\nIt should work alright like this...";

你可以简单地替换

String text = "I am trying to create a PDF file with a lot of text contents in the document. I am using PDFBox"; 
List<String> lines = new ArrayList<String>();
int lastSpace = -1;
while (text.length() > 0)
{
    [...]
}

在上面的解决方案中

String textNL = "I am trying to create a PDF file with a lot of text contents in the document. I am using PDFBox.\nFurthermore, I have added some newline characters to the string at which lines also shall be broken.\nIt should work alright like this..."; 
List<String> lines = new ArrayList<String>();
for (String text : textNL.split("\n"))
{
    int lastSpace = -1;
    while (text.length() > 0)
    {
        [...]
    }
}

（来自BreakLongString.java测试testBreakStringNL）

结果：

Answer 2

我知道这有点晚了，但我对mkl的解决方案有点问题。如果最后一行只包含一个单词，则算法会将其写入前一行。

例如：“Lorem ipsum dolor sit amet”是你的文字，它应该在“坐”后添加换行符。

Lorem ipsum dolor sit
amet

但它确实如此：

Lorem ipsum dolor sit amet

我提出了自己想要与你分享的解决方案。

/**
 * @param text The text to write on the page.
 * @param x The position on the x-axis.
 * @param y The position on the y-axis.
 * @param allowedWidth The maximum allowed width of the whole text (e.g. the width of the page - a defined margin).
 * @param page The page for the text.
 * @param contentStream The content stream to set the text properties and write the text.
 * @param font The font used to write the text.
 * @param fontSize The font size used to write the text.
 * @param lineHeight The line height of the font (typically 1.2 * fontSize or 1.5 * fontSize).
 * @throws IOException
 */
private void drawMultiLineText(String text, int x, int y, int allowedWidth, PDPage page, PDPageContentStream contentStream, PDFont font, int fontSize, int lineHeight) throws IOException {

    List<String> lines = new ArrayList<String>();

    String myLine = "";

    // get all words from the text
    // keep in mind that words are separated by spaces -> "Lorem ipsum!!!!:)" -> words are "Lorem" and "ipsum!!!!:)"
    String[] words = text.split(" ");
    for(String word : words) {

        if(!myLine.isEmpty()) {
            myLine += " ";
        }

        // test the width of the current line + the current word
        int size = (int) (fontSize * font.getStringWidth(myLine + word) / 1000);
        if(size > allowedWidth) {
            // if the line would be too long with the current word, add the line without the current word
            lines.add(myLine);

            // and start a new line with the current word
            myLine = word;
        } else {
            // if the current line + the current word would fit, add the current word to the line
            myLine += word;
        }
    }
    // add the rest to lines
    lines.add(myLine);

    for(String line : lines) {
        contentStream.beginText();
        contentStream.setFont(font, fontSize);
        contentStream.moveTextPositionByAmount(x, y);
        contentStream.drawString(line);
        contentStream.endText();

        y -= lineHeight;
    }

}

Answer 3

///// FOR PDBOX 2.0.X
//  FOR ADDING DYNAMIC PAGE ACCORDING THE LENGTH OF THE CONTENT

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;

public class Document_Creation {

   public static void main (String args[]) throws IOException {

       PDDocument doc = null;
       try
       {
           doc = new PDDocument();
           PDPage page = new PDPage();
           doc.addPage(page);
           PDPageContentStream contentStream = new PDPageContentStream(doc, page);

           PDFont pdfFont = PDType1Font.HELVETICA;
           float fontSize = 25;
           float leading = 1.5f * fontSize;

           PDRectangle mediabox = page.getMediaBox();
           float margin = 72;
           float width = mediabox.getWidth() - 2*margin;
           float startX = mediabox.getLowerLeftX() + margin;
           float startY = mediabox.getUpperRightY() - margin;

           String text = "I am trying to create a PDF file with a lot of text contents in the document. I am using PDFBox.An essay is, generally, a piece of writing that gives the author's own argument — but the definition is vague, overlapping with those of an article, a pamphlet, and a short story. Essays have traditionally been sub-classified as formal and informal. Formal essays are characterized by serious purpose, dignity, logical organization, length,whereas the informal essay is characterized by the personal element (self-revelation, individual tastes and experiences, confidential manner), humor, graceful style, rambling structure, unconventionality or novelty of theme.Lastly, one of the most attractive features of cats as housepets is their ease of care. Cats do not have to be walked. They get plenty of exercise in the house as they play, and they do their business in the litter box. Cleaning a litter box is a quick, painless procedure. Cats also take care of their own grooming. Bathing a cat is almost never necessary because under ordinary circumstances cats clean themselves. Cats are more particular about personal cleanliness than people are. In addition, cats can be left home alone for a few hours without fear. Unlike some pets, most cats will not destroy the furnishings when left alone. They are content to go about their usual activities until their owners return."; 
           List<String> lines = new ArrayList<String>();
           int lastSpace = -1;
           while (text.length() > 0)
           {
               int spaceIndex = text.indexOf(' ', lastSpace + 1);
               if (spaceIndex < 0)
                   spaceIndex = text.length();
               String subString = text.substring(0, spaceIndex);
               float size = fontSize * pdfFont.getStringWidth(subString) / 1000;
               System.out.printf("'%s' - %f of %f\n", subString, size, width);
               if (size > width)
               {
                   if (lastSpace < 0)
                       lastSpace = spaceIndex;
                   subString = text.substring(0, lastSpace);
                   lines.add(subString);
                   text = text.substring(lastSpace).trim();
                   System.out.printf("'%s' is line\n", subString);
                   lastSpace = -1;
               }
               else if (spaceIndex == text.length())
               {
                   lines.add(text);
                   System.out.printf("'%s' is line\n", text);
                   text = "";
               }
               else
               {
                   lastSpace = spaceIndex;
               }
           }

           contentStream.beginText();
           contentStream.setFont(pdfFont, fontSize);
           contentStream.newLineAtOffset(startX, startY);
           float currentY=startY;
           for (String line: lines)
           {
               currentY -=leading;

               if(currentY<=margin)
               {

                   contentStream.endText(); 
                   contentStream.close();
                   PDPage new_Page = new PDPage();
                   doc.addPage(new_Page);
                   contentStream = new PDPageContentStream(doc, new_Page);
                   contentStream.beginText();
                   contentStream.setFont(pdfFont, fontSize);
                   contentStream.newLineAtOffset(startX, startY);
                   currentY=startY;
               }
               contentStream.showText(line);
               contentStream.newLineAtOffset(0, -leading);
           }
           contentStream.endText(); 
           contentStream.close();

           doc.save("C:/Users/VINAYAK/Desktop/docccc/break-long-string.pdf");
       }
       finally
       {
           if (doc != null)
           {
               doc.close();
           }
       }

   }  
}

Answer 4

只需在下面的位置绘制字符串，通常在循环内完成：

float textx = margin+cellMargin;
float texty = y-15;
for(int i = 0; i < content.length; i++){
    for(int j = 0 ; j < content[i].length; j++){
        String text = content[i][j];
        contentStream.beginText();
        contentStream.moveTextPositionByAmount(textx,texty);
        contentStream.drawString(text);
        contentStream.endText();
        textx += colWidth;
    }
    texty-=rowHeight;
    textx = margin+cellMargin;
}

这些是重要的路线：

contentStream.beginText();
contentStream.moveTextPositionByAmount(textx,texty);
contentStream.drawString(text);
contentStream.endText();

只需在新位置绘制新字符串即可。有关使用表格的示例，请参见此处： http://fahdshariff.blogspot.ca/2010/10/creating-tables-with-pdfbox.html

Answer 5

contentStream.moveTextPositionByAmount（textx，texty）是关键点。

例如，如果您使用的是A4尺寸，则意味着580,800的宽度和高度相对应（大约）。因此，您可以根据文档大小的位置移动文本。

PDFBox支持不同的页面格式。因此，不同页面格式的高度和宽度会有所不同

Answer 6

Pdfbox-layout提取出管理布局的所有繁琐细节。作为完整的Kotlin示例，下面是如何在不担心换行和分页的情况下将文本文件转换为pdf的方法。

android-elevation: 0;

如何使用Apache pdfbox在PDF中生成多行

6 个答案:

PDFBox 1.8.x

PDFBox 2.0.x

结果

添加无条件换行符