Read and return the entire contents of the supplied File. : Text File « File « Java Tutorial






/*
 * JBoss DNA (http://www.jboss.org/dna)
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 * See the AUTHORS.txt file in the distribution for a full listing of 
 * individual contributors. 
 *
 * JBoss DNA is free software. Unless otherwise indicated, all code in JBoss DNA
 * is licensed to you under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * JBoss DNA is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;
/**
 * @author Randall Hauch
 */
public class Main {
  /**
   * Read and return the entire contents of the supplied {@link File}.
   * 
   * @param file the file containing the information to be read; may be null
   * @return the contents, or an empty string if the supplied reader is null
   * @throws IOException if there is an error reading the content
   */
  public static String read( File file ) throws IOException {
      if (file == null) return "";
      StringBuilder sb = new StringBuilder();
      boolean error = false;
      Reader reader = new FileReader(file);
      try {
          int numRead = 0;
          char[] buffer = new char[1024];
          while ((numRead = reader.read(buffer)) > -1) {
              sb.append(buffer, 0, numRead);
          }
      } catch (IOException e) {
          error = true; // this error should be thrown, even if there is an error closing reader
          throw e;
      } catch (RuntimeException e) {
          error = true; // this error should be thrown, even if there is an error closing reader
          throw e;
      } finally {
          try {
              reader.close();
          } catch (IOException e) {
              if (!error) throw e;
          }
      }
      return sb.toString();
  }
}








11.80.Text File
11.80.1.Read the contents of a file and place them in a string object.
11.80.2.Dump a String to a text file with encoding.
11.80.3.Load a text file contents as a String.
11.80.4.Read and return the entire contents of the supplied File.
11.80.5.Read ByteArrayInputStream to String
11.80.6.Load File As Text
11.80.7.Load file line by line
11.80.8.Load file content to List
11.80.9.Read string from InputStream and Reader
11.80.10.Gets the content from a File as String Array List
11.80.11.Searches case sensitively in a file
11.80.12.ReadLines: read file to list of strings