java 讀取本地檔案執行個體

例1

讀取本地例子，出現錯誤自己去尋找相應的jar包！

代碼如下

複製代碼

package loginQQ;   import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.InputStreamReader;   public class LoadingRead {   /** * 讀取設定檔 */ 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()){//判斷是否有檔案 //避免漢字編碼問題 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("抱歉哦，沒有找到ini檔案"); } }catch (Exception e) { e.printStackTrace(); } } }

例2

代碼如下

複製代碼

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());    }     }    }   } 輸出： ----------------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,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-