GZIPInputStream reading line by line

Question

I have a file in  gz format  The java class for reading this file is GZIPInputStream   However  this class doesn t extend the BufferedReader class of java  As a result  I am not able to read the file line by line  I need something like this  reader    new MyGZInputStream  some constructor of GZInputStream   reader readLine        I though of creating my class which extends the Reader or BufferedReader class of java and use GZIPInputStream as one of its variable   import java io BufferedReader  import java io FileInputStream  import java io FileNotFoundException  import java io IOException  import java io Reader  import java util zip GZIPInputStream   public class MyGZFilReader extends Reader        private GZIPInputStream gzipInputStream   null      char   buf   new char 1024         Override     public void close   throws IOException           gzipInputStream close               public MyGZFilReader String filename                 throws FileNotFoundException  IOException           gzipInputStream   new GZIPInputStream new FileInputStream filename                Override     public int read char   cbuf  int off  int len  throws IOException              TODO Auto-generated method stub         return gzipInputStream read  byte   buf  off  len              But  this doesn t work when I use  BufferedReader in   new BufferedReader      new MyGZFilReader  F  gawiki-20090614-stub-meta-history xml gz     System out println in readLine       Can someone advice how to proceed

User · Answer

here is with one line   try  BufferedReader br   new BufferedReader          new InputStreamReader             new GZIPInputStream                new FileInputStream                    F  gawiki-20090614-stub-meta-history xml gz              br readLine

User · Answer

GZIPInputStream gzip   new GZIPInputStream new FileInputStream  F  gawiki-20090614-stub-meta-history xml gz     BufferedReader br   new BufferedReader new InputStreamReader gzip    br readLine

User · Answer

BufferedReader in   new BufferedReader new InputStreamReader          new GZIPInputStream new FileInputStream  F  gawiki-20090614-stub-meta-history xml gz        String content   while   content   in readLine       null      System out println content

User · Answer

You can use the following method in a util class  and use it whenever necessary     public static List lt String gt  readLinesFromGZ String filePath        List lt String gt  lines   new ArrayList lt  gt         File file   new File filePath        try  GZIPInputStream gzip   new GZIPInputStream new FileInputStream file                BufferedReader br   new BufferedReader new InputStreamReader gzip               String line   null          while   line   br readLine       null                lines add line                   catch  FileNotFoundException e            e printStackTrace System err         catch  IOException e            e printStackTrace System err             return lines

User · Answer

The basic setup of decorators is like this   InputStream fileStream   new FileInputStream filename   InputStream gzipStream   new GZIPInputStream fileStream   Reader decoder   new InputStreamReader gzipStream  encoding   BufferedReader buffered   new BufferedReader decoder     The key issue in this snippet is the value of encoding  This is the character encoding of the text in the file  Is it  US-ASCII    UTF-8    SHIFT-JIS    ISO-8859-9    hellip   there are hundreds of possibilities  and the correct choice usually cannot be determined from the file itself  It must be specified through some out-of-band channel    For example  maybe it s the platform default  In a networked environment  however  this is extremely fragile  The machine that wrote the file might sit in the neighboring cubicle  but have a different default file encoding   Most network protocols use a header or other metadata to explicitly note the character encoding    In this case  it appears from the file extension that the content is XML  XML includes the  encoding  attribute in the XML declaration for this purpose  Furthermore  XML should really be processed with an XML parser  not as text  Reading XML line-by-line seems like a fragile  special case   Failing to explicitly specify the encoding is against the second commandment  Use the default encoding at your peril

[java] GZIPInputStream reading line by line

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