在java中使用Apache Tika从PDF文件中提取文本
try {
File file = new File("Example.pdf");
String content = new Tika().parseToString(file);
System.out.println("The Content: " + content);
} catch (Exception e) {
e.printStackTrace();
}
我已经导入java.io.File
和导入org.apache.tika.Tika
; 但在运行此代码我得到的错误是这样的:在java中使用Apache Tika从PDF文件中提取文本
Exception in thread "main" java.lang.NoSuchMethodError: org.slf4j.spi.LocationAwareLogger.log(Lorg/slf4j/Marker;Ljava/lang/String;ILjava/lang/String;Ljava/lang/Throwable;)V at org.apache.commons.logging.impl.SLF4JLocationAwareLog.warn(SLF4JLocationAwareLog.java:162) at org.apache.pdfbox.pdmodel.font.FileSystemFontProvider.loadDiskCache(FileSystemFontProvider.java:461) at org.apache.pdfbox.pdmodel.font.FileSystemFontProvider.(FileSystemFontProvider.java:217) at org.apache.pdfbox.pdmodel.font.FontMapperImpl$DefaultFontProvider.(FontMapperImpl.java:130) at org.apache.pdfbox.pdmodel.font.FontMapperImpl.getProvider(FontMapperImpl.java:149) at org.apache.pdfbox.pdmodel.font.FontMapperImpl.findFont(FontMapperImpl.java:413) at org.apache.pdfbox.pdmodel.font.FontMapperImpl.findFontBoxFont(FontMapperImpl.java:376) at org.apache.pdfbox.pdmodel.font.FontMapperImpl.getFontBoxFont(FontMapperImpl.java:350) at org.apache.pdfbox.pdmodel.font.PDType1Font.(PDType1Font.java:146) at org.apache.pdfbox.pdmodel.font.PDType1Font.(PDType1Font.java:79) at org.apache.pdfbox.pdmodel.font.PDFontFactory.createFont(PDFontFactory.java:62) at org.apache.pdfbox.pdmodel.PDResources.getFont(PDResources.java:143) at org.apache.pdfbox.contentstream.operator.text.SetFontAndSize.process(SetFontAndSize.java:60) at org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:838) at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:495) at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:469) at org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:150) at org.apache.pdfbox.text.LegacyPDFStreamEngine.processPage(LegacyPDFStreamEngine.java:139) at org.apache.pdfbox.text.PDFTextStripper.processPage(PDFTextStripper.java:391) at org.apache.tika.parser.pdf.PDF2XHTML.processPage(PDF2XHTML.java:147) at org.apache.pdfbox.text.PDFTextStripper.processPages(PDFTextStripper.java:319) at org.apache.pdfbox.text.PDFTextStripper.writeText(PDFTextStripper.java:266) at org.apache.tika.parser.pdf.PDF2XHTML.process(PDF2XHTML.java:117) at org.apache.tika.parser.pdf.PDFParser.parse(PDFParser.java:167) at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280) at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280) at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:135) at org.apache.tika.Tika.parseToString(Tika.java:527) at org.apache.tika.Tika.parseToString(Tika.java:642) at java_programs.PdfParse.main(PdfParse.java:22)
以下似乎为我工作。 我得到了我想要的字符串,但我也在控制台中打印了一些警告。
[在Windows上]我编译,这样运行:
javac -cp .;tika-app-1.16.jar Test.java
java -cp .;tika-app-1.16.jar Test
什么蒂卡罐子您使用的? 我添加了另一种方法(tikaPdfTest()
)来显示从PDF获取文本的不同方式,可能会对您有所帮助。
import java.io.File;
import org.apache.tika.Tika;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.parser.pdf.PDFParser;
import org.apache.tika.sax.BodyContentHandler;
import org.apache.tika.Tika;
import org.xml.sax.SAXException;
public class Test {
public static void main(final String[] args) {
//Your way
try {
File file = new File("Example.pdf");
String content = new Tika().parseToString(file);
System.out.println("The Content: " + content);
} catch (final Exception e) {
e.printStackTrace();
}
//Another way
try {
System.out.println("The contents:\t[" + Test.tikaPdfTest("Example.pdf") + "]");
} catch (final Exception e) {
e.printStackTrace();
}
}
public static String tikaPdfTest(final String fileName) throws IOException, SAXException, TikaException {
try(final FileInputStream inputstream = new FileInputStream(new File(fileName))) {
final BodyContentHandler handler = new BodyContentHandler();
new PDFParser().parse(inputstream, handler, new Metadata(), new ParseContext());
return handler.toString().trim();
}
}
}
谢谢你的答案。我正在使用tika-app-1.16.jar –
你能告诉我哪些罐子已经用过,这样我就可以去掉其他罐子,因为它在运行你的代码后仍然显示出同样的错误。 –
感谢它工作正常。我只是创建一个新的项目和一个新的Java文件。 –
您是如何将Apache Tika添加到您的项目中的?只有它看起来像你错误地得到了一个旧的slf4j罐子,而不是从Tika – Gagravarr