Java抽取Word和PDF格式檔案的四種武器

來源:互聯網
上載者:User

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);
}
}

 

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