很多人用java進行文檔操作時經常會遇到一個問題,就是如何獲得word,excel,pdf等文檔的內容?我研究了一下,在這裡總結一下抽取word,pdf的幾種方法。
1. 用jacob
其實jacob是一個bridage,串連java和com或者win32函數的一個中介軟體,jacob並不能直接抽取word,excel等檔案,需要自己寫dll哦,不過已經有為你寫好的了,就是jacob的作者一併提供了。
jacob jar與dll檔案下載: http://danadler.com/jacob/
下載了jacob並放到指定的路徑之後(dll放到path,jar檔案放到classpath),就可以寫你自己的抽取程式了,下面是一個簡單的例子:
import java.io.File; import com.jacob.com.*; import com.jacob.activeX.*; /** * Title: pdf extraction * Description: email:chris@matrix.org.cn * Copyright: Matrix Copyright (c) 2003 * Company: Matrix.org.cn * @author chris * @version 1.0,who use this example pls remain the declare */ public class FileExtracter{ public static void main(String[] args) { ActiveXComponent component = new ActiveXComponent("Word.Application"); String inFile = "c://test.doc"; String tpFile = "c://temp.htm"; String otFile = "c://temp.XML"; boolean flag = false; try { component.setProperty("Visible", new Variant(false)); Object wordacc = component.getProperty("document.").toDispatch(); Object wordfile = Dispatch.invoke(wordacc,"Open", Dispatch.Method, new Object[]{inFile,new Variant(false), new Variant(true)}, new int[1] ).toDispatch(); Dispatch.invoke(wordfile,"SaveAs", Dispatch.Method, new Object[]{ tpFile,new Variant(8)}, new int[1]); Variant f = new Variant(false); Dispatch.call(wordfile, "Close", f); flag = true; } catch (Exception e) { e.printStackTrace(); } finally { component.invoke("Quit", new Variant[] {}); } } } |
2. 用apache的poi來抽取word,excel
poi是apache的一個項目,不過就算用poi你可能都覺得很煩,不過不要緊,這裡提供了更加簡單的一個介面給你:
下載經過封裝後的poi包: http://jakarta.apache.org/poi/
下載之後,放到你的classpath就可以了,下面是如何使用它的一個例子:
import java.io.*; import org.textmining.text.extraction.WordExtractor; /** * Title: word extraction * Description: email:chris@matrix.org.cn * Copyright: Matrix Copyright (c) 2003 * Company: Matrix.org.cn * @author chris * @version 1.0,who use this example pls remain the declare */
public class PdfExtractor { public PdfExtractor() { } public static void main(String args[]) throws Exception { FileInputStream in = new FileInputStream ("c://a.doc"); WordExtractor extractor = new WordExtractor(); String str = extractor.extractText(in); System.out.println("the result length is"+str.length()); System.out.println("the result is"+str); } } public class PdfExtractor { public PdfExtractor() { } public static void main(String args[]) throws Exception { FileInputStream in = new FileInputStream ("c://a.doc"); WordExtractor extractor = new WordExtractor(); String str = extractor.extractText(in); System.out.println("the result length is"+str.length()); System.out.println("the result is"+str); } } |
3. pdfbox-用來抽取pdf檔案
但是pdfbox對中文支援還不好,先下載pdfbox: http://www.pdfbox.org/
下面是一個如何使用pdfbox抽取pdf檔案的例子:
import org.pdfbox.pdmodel.PDdocument. import org.pdfbox.pdfparser.PDFParser; import java.io.*; import org.pdfbox.util.PDFTextStripper; import java.util.Date; /** * Title: pdf extraction * Description: email:chris@matrix.org.cn * Copyright: Matrix Copyright (c) 2003 * Company: Matrix.org.cn * @author chris * @version 1.0,who use this example pls remain the declare */
public class PdfExtracter{
public PdfExtracter(){ } public String GetTextFromPdf(String filename) throws Exception { String temp=null; PDdocument.nbsppdfdocument.null; FileInputStream is=new FileInputStream(filename); PDFParser parser = new PDFParser( is ); parser.parse(); pdfdocument.nbsp= parser.getPDdocument.); ByteArrayOutputStream out = new ByteArrayOutputStream(); OutputStreamWriter writer = new OutputStreamWriter( out ); PDFTextStripper stripper = new PDFTextStripper(); stripper.writeText(pdfdocument.getdocument.), writer ); writer.close(); byte[] contents = out.toByteArray();
String ts=new String(contents); System.out.println("the string length is"+contents.length+"/n"); return ts; } public static void main(String args[]) { PdfExtracter pf=new PdfExtracter(); PDdocument.nbsppdfdocument.nbsp= null;
try{ String ts=pf.GetTextFromPdf("c://a.pdf"); System.out.println(ts); } catch(Exception e) { e.printStackTrace(); } }
} |
4. 抽取支援中文的pdf檔案-xpdf
xpdf是一個開源項目,我們可以調用他的本地方法來實現抽取中文pdf檔案。
下載xpdf函數包: http://www.foolabs.com/xpdf/
同時需要下載支援中文的補丁包,按照readme放好中文的patch,就可以開始寫調用本地方法的java程式了。
下面是一個如何調用的例子:
import java.io.*; /** * Title: pdf extraction * Description: email:chris@matrix.org.cn * Copyright: Matrix Copyright (c) 2003 * Company: Matrix.org.cn * @author chris * @version 1.0,who use this example pls remain the declare */
public class PdfWin { public PdfWin() { } public static void main(String args[]) throws Exception { String PATH_TO_XPDF="C://Program Files//xpdf//pdftotext.exe"; String filename="c://a.pdf"; String[] cmd = new String[] { PATH_TO_XPDF, "-enc", "UTF-8", "-q", filename, "-"}; Process p = Runtime.getRuntime().exec(cmd); BufferedInputStream bis = new BufferedInputStream(p.getInputStream()); InputStreamReader reader = new InputStreamReader(bis, "UTF-8"); StringWriter out = new StringWriter(); char [] buf = new char[10000]; int len; while((len = reader.read(buf))>= 0) { //out.write(buf, 0, len); System.out.println("the length is"+len); } reader.close(); String ts=new String(buf); System.out.println("the str is"+ts); } } |