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There might be cases when the document is presented only as a stream (without a copy on the local disk). To avoid the overhead of saving documents to the disk, GroupDocs.Parser enables to extract data from streams directly.
The Parser constructor accepts a Java java.io.InputStream. The package provides the readDataFromStream helper that reads a Node.js readable stream (a file stream, an HTTP response, etc.) and passes its content to the callback as a Java input stream.
The following example shows how to load the document from a Node.js stream:
const fs = require('fs');
const groupdocs = require('@groupdocs/groupdocs.parser');
// Read the Node.js stream into a Java input stream
groupdocs.readDataFromStream(fs.createReadStream('sample.pdf'), (stream) => {
// Create an instance of Parser class with the stream
const parser = new groupdocs.Parser(stream);
try {
// Extract a text into the reader
const reader = parser.getText();
// If text extraction isn't supported, a reader is null
if (reader === null) {
console.log("Text extraction isn't supported");
} else {
try {
// Print a text from the document
console.log(reader.readToEnd());
} finally {
reader.close();
}
}
} finally {
parser.close();
stream.close();
}
process.exit(0);
});
readDataFromStream buffers the whole stream in memory. To read a file with a Java stream instead, create java.io.FileInputStream with the java module:
const java = require('java');
const groupdocs = require('@groupdocs/groupdocs.parser');
const FileInputStream = java.import('java.io.FileInputStream');
// Create the stream
const stream = new FileInputStream('sample.pdf');
try {
// Create an instance of Parser class with the stream
const parser = new groupdocs.Parser(stream);
try {
// Extract a text into the reader
const reader = parser.getText();
// If text extraction isn't supported, a reader is null
console.log(reader === null ? "Text extraction isn't supported" : reader.readToEnd());
if (reader !== null) {
reader.close();
}
} finally {
parser.close();
}
} finally {
stream.close();
}
process.exit(0);
Along with the full-featured library we provide simple but powerful free Apps.
You are welcome to parse documents and extract data from PDF, DOC, DOCX, PPT, PPTX, XLS, XLSX, Emails and more with our Free Online Document Parser App.
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