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 Tools and Libs > Google Guava > IO > Readline Processor

Readline Processor 

Google Guava is a java library with lot of utilities and reusable components. This requires the library guava-10.0.jar to be in classpath. The following example shows using Files.readLines() API.

File Name  :  abcd.txt

File Name  :  
com/bethecoder/tutorials/guava/io_tests/ReadLineProcessorTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.guava.io_tests;

import java.io.File;
import java.io.IOException;

import com.google.common.base.Charsets;
import com.google.common.io.Files;
import com.google.common.io.LineProcessor;

public class ReadLineProcessorTest {

  /**
   @param args
   @throws IOException 
   */
  public static void main(String[] argsthrows IOException {
    File file = new File("C:\\abcd.txt");
    String first4lines = Files.readLines(file, Charsets.UTF_8, new SimpleLineProcessor());
    System.out.println(first4lines);
  }
}

class SimpleLineProcessor implements LineProcessor<String> {

  StringBuilder lineBuf = new StringBuilder();
  private int lineCount = 0;
  
  @Override
  public String getResult() {
    return lineBuf.toString();
  }

  @Override
  public boolean processLine(String linethrows IOException {

    //read only first 2 lines
    //true to continue processing, false to stop
    if (lineCount ++ < 2) {
      lineBuf.append(line).append("\n");
      return true;
    }
    
    return false;
  }
  
}
   

It gives the following output,
ABCD
ABCD


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