获取 java.lang.NoClassDefFoundError: org/pdfbox/pdfparser/ [英] Getting java.lang.NoClassDefFoundError: org/pdfbox/pdfparser/
本文介绍了获取 java.lang.NoClassDefFoundError: org/pdfbox/pdfparser/的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
以下是我正在使用的代码，我提供了一个 pdf 文件和一个文本文件作为命令行的输入.
Below is the code that I am using, I've provided one pdf file and one text file as an input to command line.
import org.pdfbox.cos.COSDocument;
import org.pdfbox.pdfparser.PDFParser;
import org.pdfbox.pdmodel.PDDocument;
import org.pdfbox.pdmodel.PDDocumentInformation;
import org.pdfbox.util.PDFTextStripper;
import java.io.File;
import java.io.FileInputStream;
import java.io.PrintWriter;
public class PDFTextParser {
PDFParser parser;
String parsedText;
PDFTextStripper pdfStripper;
PDDocument pdDoc;
COSDocument cosDoc;
PDDocumentInformation pdDocInfo;
// PDFTextParser Constructor
public PDFTextParser() {
}
// Extract text from PDF Document
String pdftoText(String fileName) {
System.out.println("Parsing text from PDF file " + fileName + "....");
File f = new File(fileName);
if (!f.isFile()) {
System.out.println("File " + fileName + " does not exist.");
return null;
}
try {
parser = new PDFParser(new FileInputStream(f));
} catch (Exception e) {
System.out.println("Unable to open PDF Parser.");
return null;
}
try {
parser.parse();
cosDoc = parser.getDocument();
pdfStripper = new PDFTextStripper();
pdDoc = new PDDocument(cosDoc);
parsedText = pdfStripper.getText(pdDoc);
} catch (Exception e) {
System.out.println("An exception occured in parsing the PDF Document.");
e.printStackTrace();
try {
if (cosDoc != null) cosDoc.close();
if (pdDoc != null) pdDoc.close();
} catch (Exception e1) {
e.printStackTrace();
}
return null;
}
System.out.println("Done.");
return parsedText;
}
// Write the parsed text from PDF to a file
void writeTexttoFile(String pdfText, String fileName) {
System.out.println("\nWriting PDF text to output text file " + fileName + "....");
try {
PrintWriter pw = new PrintWriter(fileName);
pw.print(pdfText);
pw.close();
} catch (Exception e) {
System.out.println("An exception occured in writing the pdf text to file.");
e.printStackTrace();
}
System.out.println("Done.");
}
//Extracts text from a PDF Document and writes it to a text file
public static void main(String args[]) {
if (args.length != 2) {
System.out.println("Usage: java PDFTextParser ");
System.exit(1);
}
PDFTextParser pdfTextParserObj = new PDFTextParser();
String pdfToText = pdfTextParserObj.pdftoText(args[0]);
if (pdfToText == null) {
System.out.println("PDF to Text Conversion failed.");
}
else {
System.out.println("\nThe text parsed from the PDF Document....\n" + pdfToText);
pdfTextParserObj.writeTexttoFile(pdfToText, args[1]);
}
}
}
通过命令行运行此代码并输入 2 个 pdf 文件名和另一个文本文件名后，我收到 noClassDefFound 异常.下面是堆栈跟踪.
After Running this code via command line with 2 inputs one pdf file name and another text file name I am getting noClassDefFound exception. Below is the stack trace.
Exception in thread "main" java.lang.NoClassDefFoundError: org/pdfbox/pdfparser/
PDFParser
at PDFTextParser.pdftoText(PDFTextParser.java:42)
at PDFTextParser.main(PDFTextParser.java:93)
Caused by: java.lang.ClassNotFoundException: org.pdfbox.pdfparser.PDFParser
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 2 more
添加类路径后，我得到以下异常
After adding class path I am getting below Exceptions
Exception in thread "main" java.lang.NoClassDefFoundError: org/fontbox/afm/AFMParser
at org.pdfbox.pdmodel.font.PDFont.getAFM(PDFont.java:350)
at org.pdfbox.pdmodel.font.PDFont.getAverageFontWidthFromAFMFile(PDFont.java:313)
at org.pdfbox.pdmodel.font.PDSimpleFont.getAverageFontWidth(PDSimpleFont.java:231)
at org.pdfbox.util.PDFStreamEngine.showString(PDFStreamEngine.java:276)
at org.pdfbox.util.operator.ShowTextGlyph.process(ShowTextGlyph.java:80)
at org.pdfbox.util.PDFStreamEngine.processOperator(PDFStreamEngine.java:452)
at org.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:215)
at org.pdfbox.util.PDFStreamEngine.processStream(PDFStreamEngine.java:174)
at org.pdfbox.util.PDFTextStripper.processPage(PDFTextStripper.java:336)
at org.pdfbox.util.PDFTextStripper.processPages(PDFTextStripper.java:259)
at org.pdfbox.util.PDFTextStripper.writeText(PDFTextStripper.java:216)
at org.pdfbox.util.PDFTextStripper.getText(PDFTextStripper.java:149)
at PDFTextParser.pdftoText(PDFTextParser.java:53)
at PDFTextParser.main(PDFTextParser.java:93)
Caused by: java.lang.ClassNotFoundException: org.fontbox.afm.AFMParser
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 14 more
推荐答案
在 Java 中运行具有外部依赖项(在您的情况下为 PDF 解析器)的程序时，您必须将适当的 JAR 文件包含到您的 CLASSPATH 中.
When running a program with external dependencies (PDF parser in your case) in Java you have to include the appropriate JAR files to your CLASSPATH.
我搜索了在 jarfinder.com 上找不到的类，结果发现您需要(至少)包含两个不同的 JAR 文件 - 字体框 和 pdf box JARs.
I have searched for the classes that cannot be found at jarfinder.com and it turns out you need to include (at least) two different JAR files - the font box and the pdf box JARs.
这篇关于获取 java.lang.NoClassDefFoundError: org/pdfbox/pdfparser/的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
