java利用pdfbox處理pdf

剛開始以為java讀取pdf向讀取txt文件一樣簡單，圖樣圖森普！亂碼問題！

Game Starts

參考文檔

　　1） http://pdfbox.apache.org/cookbook/documentcreation.html

依賴jar包

　　1）pdfbox-app-1.8.6.jar http://pdfbox.apache.org/downloads.html#recent

What's Up

Lucene怎么對pdf做索引呢？轉成txt嗎？

Lucene Integration

Document luceneDocument = LucenePDFDocument.getDocument( ... );

Alway Be Coding

Create a blank PDF

This small sample shows how to create a new PDF document using PDFBox.

// Create a new empty document
PDDocument document = new PDDocument();

// Create a new blank page and add it to the document
PDPage blankPage = new PDPage();
document.addPage( blankPage );

// Save the newly created document
document.save("BlankPage.pdf");

// finally make sure that the document is properly
// closed.
document.close();

Hello World using a PDF base font

This small sample shows how to create a new document and print the text "Hello World" using one of the PDF base fonts.

// Create a document and add a page to it
PDDocument document = new PDDocument();
PDPage page = new PDPage();
document.addPage( page );

// Create a new font object selecting one of the PDF base fonts
PDFont font = PDType1Font.HELVETICA_BOLD;

// Start a new content stream which will "hold" the to be created content
PDPageContentStream contentStream = new PDPageContentStream(document, page);

// Define a text content stream using the selected font, moving the cursor and drawing the text "Hello World"
contentStream.beginText();
contentStream.setFont( font, 12 );
contentStream.moveTextPositionByAmount( 100, 700 );//注意這個坐標，(0,0)為本頁的左下角
contentStream.drawString( "Hello World" );
contentStream.endText();

// Make sure that the content stream is closed:
contentStream.close();

// Save the results and ensure that the document is properly closed:
document.save( "Hello World.pdf");
document.close();

Read PDF

下面是我參考網上的代碼自己嘗試的，官網沒有具體例子介紹
其實整個過程就是 加載Document(pdf文檔) 利用IO流寫入到TXT文件

package tools;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileWriter;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.util.PDFTextStripper;

public class PDFHandler {
    public static void readPDF(String pdfFile) {
        String txtFile = null;
        PDDocument doc = null;
        FileWriter writer = null;
        URL url = null;
        try {
            url = new URL(pdfFile); 
        } catch (MalformedURLException e) {
            //有異常說明無法轉成url，以文件系統處理
            url = null;
        }
        
        if(url != null) {//url處理
            try {
                doc = PDDocument.load(url);//加載文檔
                String fileName = url.getFile();
                if(fileName.endsWith(".pdf")) { //得到新文件的文件名
                    File outFile = new File(fileName.replace(".pdf", ".txt"));
                    txtFile = outFile.getName(); 
                } else {
                    return;
                }
            } catch (IOException e) {
                e.printStackTrace();
                return;
            }
        } else {//文件系統處理
            try {
                doc = PDDocument.load(pdfFile);
                if(pdfFile.endsWith(".pdf")) {
                    txtFile = pdfFile.replace(".pdf", ".txt");
                } else {
                    return;
                }
            } catch (IOException e) {
                e.printStackTrace();
                return;
            }
        }
        try {
            writer = new FileWriter(txtFile);
            PDFTextStripper textStripper = new PDFTextStripper();//讀取PDF到TXT中的操作類
            textStripper.setSortByPosition(false);//這個看了下官方說明，不是很確定是什么意思，但是為了提高效率最好設為false,缺省為false
            textStripper.setStartPage(1);//起始頁，缺省為第一頁
            textStripper.setEndPage(2);//結束頁，缺省為最后一頁
            textStripper.writeText(doc, writer);//最重要的一步，寫入到txt
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if(doc != null) {
                try {
                    doc.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if(writer!= null) {
                try {
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    public static void main(String[] args) {
        readPDF("resource/正則表達式.pdf");
    }
}

 TO BE CONTINUED……