Java Encode file to Base64 string To match with other encoded string
Solution 1
You already using apache commons-codec so I recommend adding commons-io for reading the file. That way you can remove your loadFile() method and just have:
private static String encodeFileToBase64Binary(String fileName) throws IOException {
File file = new File(fileName);
byte[] encoded = Base64.encodeBase64(FileUtils.readFileToByteArray(file));
return new String(encoded, StandardCharsets.US_ASCII);
}
Solution 2
Here is a solution without any required dependencies (Apacha et al.) requiring only JDK 8+:
import java.util.Base64;
import java.nio.file.Files;
private static String encodeFileToBase64(File file) {
try {
byte[] fileContent = Files.readAllBytes(file.toPath());
return Base64.getEncoder().encodeToString(fileContent);
} catch (IOException e) {
throw new IllegalStateException("could not read file " + file, e);
}
}
Solution 3
Since Java 8 you can use the class java.util.Base64
and the corresponding inner classes:
java.util.Base64.Encoder
java.util.Base64.Decoder
See JavaDoc: Base64-Doc
And a sample for the use: Example from Oracle
Solution 4
This example worked great for me: https://grokonez.com/java/java-advanced/java-8-encode-decode-an-image-base64
public static String encoder(String filePath) {
String base64File = "";
File file = new File(filePath);
try (FileInputStream imageInFile = new FileInputStream(file)) {
// Reading a file from file system
byte fileData[] = new byte[(int) file.length()];
imageInFile.read(fileData);
base64File = Base64.getEncoder().encodeToString(fileData);
} catch (FileNotFoundException e) {
System.out.println("File not found" + e);
} catch (IOException ioe) {
System.out.println("Exception while reading the file " + ioe);
}
return base64File;
}
Sanket Sawant
Updated on November 18, 2020Comments
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Sanket Sawant over 3 years
private static String encodeFileToBase64Binary(String fileName) throws IOException { File file = new File(fileName); byte[] bytes = loadFile(file); byte[] encoded = Base64.encodeBase64(bytes); String encodedString = new String(encoded,StandardCharsets.US_ASCII); return encodedString; } private static byte[] loadFile(File file) throws IOException { InputStream is = new FileInputStream(file); long length = file.length(); if (length > Integer.MAX_VALUE) { // File is too large } byte[] bytes = new byte[(int)length]; int offset = 0; int numRead = 0; while (offset < bytes.length && (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) { offset += numRead; } if (offset < bytes.length) { throw new IOException("Could not completely read file "+file.getName()); } is.close(); return bytes; }
// to get encode string
String encoded=encodeFileToBase64Binary("file.fmr");
// encoded string is :
Rk1SACAyMAAAAAFiAAABQAHgAMUAxQEAAABGNkDZADP/SEC8AD6CSECqAEcGSED+AFJtO0CgAGCKZEC6AGuFZEDgAHz1ZECzAI6HZEENAJluNEBWAJ4ZZEB1AKkTZEECALbuZEA/ALqfSECCALySSECxAMP/ZECIAMURVUAXAN2jGkCnAOD8ZEAoAOWlZEBnAOyhLkCyAP/tZECHAQMSGkD8AQTdZECfASKFGkCHASUaGkA1ASy6ZEDAAS3JZEDPAS7NZEAnATG4ZEDxATzOZEBOAUPLZEBzAVbuGkCAAWF8NEDTAWsxLkDnAXa0LkC/AX2nLkC0AYojIEBMAYvkSEDJAa0fT0CsAbwVIIDqANTsZIDIAPfnZICbAQKHO4D5AR/XZIBlASS7IIEoASbYO4CsAUetLoDvAVXSZIDaAVvDO4EHAWrLZICsAX2fNIDnAYEwNIDQAZKnT4BfAZxtZAAA
//encoded string from file using some other source.
Rk1SACAyMAAAAAFiAAABQAHgAMUAxQEAAABGNkCLACELSEDAADYDZEEYAGFxO0DGAGJ9SEC1AGkCSEA6AHWYVUDJAHp5ZEBEAHwVZECVAJgIZEEaALHrZEB4ALuOZEELAMFqZEEzAM/sNEDRANvwZEBkAN0VZECcAOIAZEEwAOjnLkEvAPXlO0CnAP71ZEB7AQYRNEBdAQ0eZED8ARDhZEDXASXcZECZAS3uGkBoAT4eO0AUAUMxSEA7AUYqZEDxAUnSZECmAVNDO0EIAXDHSEDYAXW7ZEEUAXXKSEEGAYY8IEEhAYrDNEDfAZ81ZEDQAcGqLoEBAC/7O4EGAE7zVYB+AP2QSICEARuLZIBnATUfO4D/ATXaZIDEATjSZIDRATrVZICnATvSNIBTATwnZIARAV1LGoB1AV2oO4CrAV68SIDnAWHGZIB+AWauNICVAX0ySICNAYytO4CJAZorSAAA
When i am trying to match both the encoded string , i am getting a missmatch. please suggest method for encode file to base64 to match encoded string found from other source. i have tried with
StandardCharsets.UTF_8
andStandardCharsets.US_ASCII
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Sanket Sawant almost 8 yearsThank you for your response. but i am getting same result in encoding.
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gfelisberto almost 8 yearsI tested this with several files and an external Base64 encoder. Can you provide an example file?
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Lutaaya Huzaifah Idris almost 7 yearsfacing a problem , Base64.encodeBase64(); cannot be resolved why?
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Cristian A. Rodríguez Enríquez over 6 years@LutaayaHuzaifahIdris you need import org.apache.commons.codec.binary.Base64; in order to use Base64.encodeBase64() you get the JAR from commons.apache.org/proper/commons-codec