Décoder l'archive ZIP encodée en Base64 (GZIP)

Question

J'ai besoin de décoder une chaîne d'archive ZIP codée Base64 (GZIP) en Java.

String = "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" 

Answer 1

import com.sun.org.apache.xml.internal.security.exceptions.Base64DecodingException; 
import com.sun.org.apache.xml.internal.security.utils.Base64; 
import java.io.BufferedReader; 
import java.io.ByteArrayInputStream; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.nio.charset.StandardCharsets; 
import java.util.zip.GZIPInputStream; 

public class GzipUtil { 


    public static void unzip() throws Base64DecodingException { 
     String encoded = "PUT BASE 64ENCODED GZIPPED STRING HERE"; 
     byte[] compressed = Base64.decode(encoded); 
     String data = new String(compressed); 
     //System.out.println(data);AAAA"; 

     if ((compressed == null) || (compressed.length == 0)) { 
      throw new IllegalArgumentException("Cannot unzip null or empty bytes"); 
     } 
     if (!isZipped(compressed)) { 
      System.out.println(compressed); 
     } 

     try (ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(compressed)) { 
      try (GZIPInputStream gzipInputStream = new GZIPInputStream(byteArrayInputStream)) { 
       try (InputStreamReader inputStreamReader = new InputStreamReader(gzipInputStream, StandardCharsets.UTF_8)) { 
        try (BufferedReader bufferedReader = new BufferedReader(inputStreamReader)) { 
         StringBuilder output = new StringBuilder(); 
         String line; 
         while((line = bufferedReader.readLine()) != null){ 
          output.append(line); 

         System.out.println(output.toString()); 

         } 

        } 
       } 
      } 
     } catch(IOException e) { 
      throw new RuntimeException("Failed to unzip content", e); 
     } 
    } 
    public static boolean isZipped(final byte[] compressed) { 
     return (compressed[0] == (byte) (GZIPInputStream.GZIP_MAGIC)) && (compressed[1] == (byte) (GZIPInputStream.GZIP_MAGIC >> 8)); 
    } 



} 



}