我正在使用metadata extractor API从图像中提取元数据。然后我使用Java创建一个包含所有数据的.txt文件。但是,当我运行该文件时,我有nullpointexception。创建文本文件时出错Java
我知道某些内容正在输出,因为它在NetBeans中提供的输出框中打印出来。
类创建文件:
private void metadataImageButtonMouseClicked(java.awt.event.MouseEvent evt) {
System.out.println(MetaData.getTags());
try {
File report;
report = new File("report.txt");
report.createNewFile();
FileWriter kmlStream = new FileWriter("report.txt");
try (BufferedWriter out = new BufferedWriter(kmlStream)) {
out.write(MetaData.allTags);
statusUpdateMessage.setText("Report file created");
System.out.println("New file \"Report.txt\" has been created to the current directory");
}
} catch (IOException ex) {
Logger.getLogger(MetaDataExtractor.class.getName()).log(Level.SEVERE, null, ex);
}
检索所有元数据
Metadata metadata = ImageMetadataReader.readMetadata(jpegFile);
for (Directory directory : metadata.getDirectories()) {
for (Tag allTags : directory.getTags()) {
System.out.println(allTags);
}
}
} catch (ImageProcessingException ex) {
Logger.getLogger(MetaData.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(MetaData.class.getName()).log(Level.SEVERE, null, ex);
}
return allTags;
我首先想到的是有返回类型为字符串,但它不会让我做。欢迎任何建议,因为我对Java不够强大。 Here are the errors
在此先感谢。