Java reads local file instances

To read files in java, we need to use java. io. file, java. io. fileInputStream, java. io. inputStreamReader has waited for the library file. Now I have found two examples for java to read local files.

Example 1

Read the local example and find the corresponding jar package if an error occurs!

The Code is as follows:

Copy code

Package loginQQ;   Import java. io. BufferedReader; Import java. io. File; Import java. io. FileInputStream; Import java. io. InputStreamReader;   Public class LoadingRead {   /** * Read the configuration file */ Public static void main (String [] args ){ String endcode = "GBK "; File file = new File ("D:/Java/YT/src/com/YT/auto/word. ini "); InputStreamReader in = null; StringBuffer pzFile = new StringBuffer (); Try { If (file. isFile () & file. exists () {// checks whether a file exists. // Avoid Chinese character encoding Problems In = new InputStreamReader (new FileInputStream (file), endcode ); BufferedReader buffer = new BufferedReader (in ); String lineText = null; While (lineText = buffer. readLine ())! = Null ){ PzFile. append (lineText ); } System. out. println (pzFile ); } Else { System. out. println ("sorry, The INI file is not found "); } } Catch (Exception e ){ E. printStackTrace (); } } }

Example 2

The Code is as follows:

Copy code

Package my. test; Import java. io. IOException; Import org. apache. hadoop. conf. Configuration;   Import org. apache. hadoop. fs. FSDataInputStream; Import org. apache. hadoop. fs. FSDataOutputStream; Import org. apache. hadoop. fs. FileStatus; Import org. apache. hadoop. fs. FileSystem; Import org. apache. hadoop. fs. Path; /** * * @ Author zhouhh * @ Date 2013.3.14 * Merge files to hdfs */ Public class testhdfspaths { Public static void main (String [] args) throws IOException { String sourceFile = ""; String targetFile = ""; If (args. length <2 ){ SourceFile = "/home/zhouhh/test "; TargetFile = "hdfs: // hadoop48: 54310/user/zhouhh "; } Else { SourceFile = args [0]; TargetFile = args [1]; } Configuration conf = new Configuration (); FileSystem hdfs = FileSystem. get (conf ); FileSystem local = FileSystem. getLocal (conf );   Try { VisitPath (local, sourceFile ); VisitPath (hdfs, targetFile ); } Catch (IOException e ){ E. printStackTrace (); }   }   Public static void visitPath (FileSystem fs, String path) throws IOException { Path inputDir = new Path (path ); FileStatus [] inputFiles = fs. listStatus (inputDir ); If (inputFiles = null) { Throw new IOException ("the path is not correct:" + path ); }   System. out. println ("---------------- path:" + path + "----------------"); For (int I = 0; I <inputFiles. length; I ++ ){       If (inputFiles [I]. isDir ()) { System. out. println (inputFiles [I]. getPath (). getName () + "-dir -"); VisitPath (fs, inputFiles [I]. getPath (). toString ()); } Else { System. out. println (inputFiles [I]. getPath (). getName () + ", len:" + inputFiles [I]. getLen ()); }   }   }   } Output: ---------------- Path:/home/zhouhh/test ---------------- HelloWorldApp. class, len: 432 A. scm, len: 99 Jar-dir- ---------------- Path: file:/home/zhouhh/test/jar ---------------- Test. jar, len: 1040 Name.txt, len: 389211 Jdk-6u38-linux-amd64.rpm, len: 58727459. Hbase_thrift.tar.gz, len: 770987 Src-dir- ... ---------------- Path: hdfs: // hadoop48: 54310/user/zhouhh ---------------- README.txt and len: 1399 A, len: 0 Fsimage, len: 9358. Gz-dir- ---------------- Path: hdfs: // hadoop48: 54310/user/zhouhh/gz ---------------- Abs.gz, len: 309589 Mytest.txt, len: 20 Output-dir-