Java语言中抽取word、pdf的四种方法
1、用jacob.
其实jacob是一个bridage,连接java和com或者win32函数的一个中间件,jacob并不能直接抽取word,excel等文件,需要自己写dll哦,不过已经有为你写好的了,就是jacob的作者一并提供了。
jacob下载:http://www.matrix.org.cn/down_view.asp?id=13
下载了jacob并放到指定的路径之后(dll放到path,jar文件放到classpath),就可以写你自己的抽取程序了,下面是一个例子:
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import java.io.File;import com.jacob.com.*;import com.jacob.activeX.*; public class FileExtracter{public static void main(String[] args) {ActiveXComponent app = new ActiveXComponent("Word.Application");String inFile = "c:\test.doc";String tpFile = "c:\temp.htm";String otFile = "c:\temp.xml";boolean flag = false;try {app.setProperty("Visible", new Variant(false));Object docs = app.getProperty("document.").toDispatch();Object doc = Dispatch.invoke(docs,"Open", Dispatch.Method, new Object[]{inFile,new Variant(false), new Variant(true)}, new int[1]).toDispatch();Dispatch.invoke(doc,"SaveAs", Dispatch.Method, new Object[]{tpFile,new Variant(8)}, new int[1]);Variant f = new Variant(false);Dispatch.call(doc, "Close", f);flag = true;} catch (Exception e) {e.printStackTrace();} finally {app.invoke("Quit", new Variant[] {});}}}
2、用apache的poi来抽取word,excel
poi是apache的一个项目,不过就算用poi你可能都觉得很烦,不过不要紧,这里提供了更加简单的一个接口给你:
下载经过封装后的poi包:http://www.matrix.org.cn/down_view.asp?id=14
下载之后,放到你的classpath就可以了,下面是如何使用它的一个例子:
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import java.io.*;import org.textmining.text.extraction.WordExtractor;/*** <p>Title: pdf extraction</p>* <p>Description: email:chris@matrix.org.cn</p>* <p>Copyright: Matrix Copyright (c) 2003</p>* <p>Company: Matrix.org.cn</p>* @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);}}
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3、pdfbox-用来抽取pdf文件
但是pdfbox对中文支持还不好,先下载pdfbox:http://www.matrix.org.cn/down_view.asp?id=12
下面是一个如何使用pdfbox抽取pdf文件的例子:
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import org.pdfbox.pdmodel.PDdocument.import org.pdfbox.pdfparser.PDFParser;import java.io.*;import org.pdfbox.util.PDFTextStripper;import java.util.Date;/*** <p>Title: pdf extraction</p>* <p>Description: email:chris@matrix.org.cn</p>* <p>Copyright: Matrix Copyright (c) 2003</p>* <p>Company: Matrix.org.cn</p>* @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+"");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();}}}
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4、抽取支持中文的pdf文件-xpdf
xpdf是一个开源项目,我们可以调用他的本地方法来实现抽取中文pdf文件。
下载xpdf函数包:http://www.matrix.org.cn/down_view.asp?id=15
同时需要下载支持中文的补丁包:http://www.matrix.org.cn/down_view.asp?id=16
按照readme放好中文的patch,就可以开始写调用本地方法的java程序了
下面是一个如何调用的例子:
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import java.io.*;/*** <p>Title: pdf extraction</p>* <p>Description: email:chris@matrix.org.cn</p>* <p>Copyright: Matrix Copyright (c) 2003</p>* <p>Company: Matrix.org.cn</p>* @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);}}
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