java读取PDF的方法

很多人问到如何抽取word,excel,pdf阿。这里我总结一下抽取word,pdf的
几种方法。
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.java-cn.com/technology/tech_downs/1880_001.zip
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:
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: est.doc";
String tpFile = "c: emp.htm";
String otFile = "c: emp.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.java-cn.com/technology/tech_downs/1880_002.zip
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:
import java.io.*;
import org.textmining.text.extraction.WordExtractor;
/**
*

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 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-用来抽取pdf文件
但是pdfbox对中文支持还不好,先下载pdfbox:
http://www.java-cn.com/technology/tech_downs/1880_003.zip
下面是一个如何使用pdfbox抽取pdf文件的例子:
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+" ");
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.java-cn.com/technology/tech_downs/1880_004.zip
同时需要下载支持中文的补丁包:
http://www.java-cn.com/technology/tech_downs/1880_005.zip
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:
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 Filesxpdfpdftotext.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);
}
}

2. jpedal

你可能感兴趣的