>" type. Please let me know how it can be " name="description">

Reading Text file and storing in map

Ads
 

Reading Text file and storing in map

Hi I have multiple text files. I want to read thoses files and store those records in map. Map will be of "LinkedHashMap<String, Map<String, String>>" type. Please let me know how it can be done?

View Answers

February 17, 2011 at 11:46 AM

Java read text files and store the value in a MAP

import java.io.*;
import java.util.*;
class OnlyExt implements FilenameFilter{
  String ext;
  public OnlyExt(String ext){
  this.ext="." + ext;
  }
  public boolean accept(File dir,String name){
  return name.endsWith(ext);
  }
}
class MapExample{
    public static void main(String[] args)throws Exception{
        FilenameFilter ff = new OnlyExt("txt");
        File folder = new File("c:/");
        File[] files = folder.listFiles(ff);
        Map<String,String> map=new LinkedHashMap<String,String>();
        for(int i=0;i<files.length;i++){
        FileReader fr = new FileReader(files[i].getPath());
            BufferedReader reader = new BufferedReader(fr);
            String st = "",str=" ";
            while((st = reader.readLine()) != null) {
        str+=st;
        }
        map.put(files[i].getName(),str);
        }
        Set set = map.entrySet();
        Iterator i = set.iterator();
        while(i.hasNext()){
        Map.Entry me = (Map.Entry)i.next();
        System.out.println(me.getKey() + " \t:\t " + me.getValue());
    }
  }
}

February 17, 2011 at 2:39 PM

thanks for the answer... i am having 10 records in each file and i have 4 files. all 10 records from file 1 are inserted at first index. it behaves similarly for all. can you suggest me another option?

Ads









Related Tutorials/Questions & Answers:
Reading Text file and storing in map
Reading Text file and storing in map  Hi I have multiple text files. I want to read thoses files and store those records in map. Map will be of "LinkedHashMap<String, Map<String, String>>" type. Please let me know
Reading a text file in java
Reading a text file in java  What is the code for Reading a text file... in java.io.* package for reading and writing to a file in Java. To learn more about reading text file in Java see the tutorial Read File in Java. Thanks
Advertisements
reading the records from a .xlsx file and storing those records in database table
reading the records from a .xlsx file and storing those records in database... file and store that records in database table. I tried like this public class...(); } } } } Here the problem is after reading
Map words to line number in text file and show occurence
Map words to line number in text file and show occurence  hi i want to Map words to line number in text file and show occurrence of word in java coding
Storing and Reading data
Storing and Reading data   Hello, I'm developing a GUI application as part of an assignment but stuck on how my program stores and reads the data the user entered into the GUI table I created. I also wanted to apply a java code
Reading big file in Java
Reading big file in Java  How to read a big text file in Java program?   Hi, Read the complete tutorial at How to read big file line by line in java? Thanks
Best way to reading file in java
Best way to reading file in java  Hi, As a beginner I want to learn about Java programming and make a program for reading a text file in java. What is the best way for reading file in Java? Thanks
Remote file storing in mobile
Remote file storing in mobile  Hai.. i want to do my semester project..i have selected a topic "Remote file storing in mobile"..it is in the form like any Java enabled GPRS based mobile phone users can store their images,video
Remote file storing in mobile
Remote file storing in mobile  Hai.. i want to do my semester project..i have selected a topic "Remote file storing in mobile"..it is in the form like any Java enabled GPRS based mobile phone users can store their images,video
Reading a big file effeciently
Reading a big file effeciently  How to read a large text file quickly without memory error in Java? What is the best method to read a big file very efficiently? Thanks   Hi, Kindly check the program Java Read File
Video Tutorial of reading file in Java
the source code of reading a text file in Java. This source code can be run in Eclipse... performance. Video tutorial for reading a text file line by line in Java using...Java Video Tutorial: Learn how you can read a big text file in Java? Java
External file reading in jsp
External file reading in jsp  i have written a jsp page(ReadExt.jsp) in my application which reads a text file content from a system... file. It uses BufferedReader class to read that particular file. <%@ page
External file reading in jsp
External file reading in jsp  i have written a jsp page(ReadExt.jsp) in my application which reads a text file content from a system...; The given code reads the given file. It uses BufferedReader class to read
Line by Line reading from a file using Scanner Class
In this section, you will get to know about reading line by line a text file using java.util.Scanner class
Thread for reading txt file
Thread for reading txt file  how to use 3 thread to read 3 txt file? To create three threads for reading the file and three threads for getting the strings out of the queue and printing them. thanks
Problem reading word file
Problem reading word file  Deepak you provide me code for extarcting equation from a word file and also to write in a word file.But when I again want to read preveously created word file(created by your code) it gives an error
Reading an excel file into array
Reading an excel file into array  Hi, I'm trying to read in an excel file, search a column for containing key words (entered by a user) and then displaying the matching rows in a table. I'm fairly new to JavaScript. Can anyone
Reading file into bytearrayoutputstream
input stream and byte output stream. This is and good example of reading file... we have used the class InputStream for reading the file content into byte...*; /** * Example of Reading file into byte array and then write byte array into a file
reading a csv file from a particular row
reading a csv file from a particular row  how to read a csv file from a particular row and storing data to sql server by using jsp servlet
Writing and Reading A File
and reading data from file for our assignment, but just stuck on how to proceed... into the text file. import java.io.*; import java.util.*; import javax.swing.*; import...;To extract the data from text file and save it to jtable, visit the following links
Storing content from file path to an array
Storing content from file path to an array  Hi, I have a path... would like to access the "Animation.txt" file from this path and store the contents in this text file to an array. I am using jsp. I can access my path but how
Stoting file name in Map
Stoting file name in Map  how to store id and file name in map
Reading .doc file using swing
Reading .doc file using swing  Sir, Could U Please Tell me the Way To Read .doc file in java using swing,with code
xml file reading using java
xml file reading using java  hi deepak I want to read some data from xml file and send that output to particular email address using java  ... n.getNodeName().equals("#text"); } public static void main(String[]args
Sorting text file
Sorting text file  Hello friends, i'm writing search page for my local website. i'm storing all file list in text file. And also adding a value... according to begin value. Text File having list like this: 5| 3| can anyone
Reading and querying an Excel file in JavaScript
Reading and querying an Excel file in JavaScript  Hi, I'm trying to read in an excel file, search a column for containing key words (entered by a user) and then displaying the matching rows in a table. I'm fairly new
reading and displaying svg file through java
reading and displaying svg file through java  sample program for reading a svg file
reading dropdown values from properties file in jsp
reading dropdown values from properties file in jsp  reading dropdown values from properties file in jsp
Reading a file from Jar JAVA
Reading a file from Jar JAVA  I have added one excel sheet into a jar file. can anybody tell me how i can read that file. actually when i am running code from eclipse i able to read it but when i am adding that jar file
Reading a file from Jar JAVA
Reading a file from Jar JAVA  I have added one excel sheet into a jar file. can anybody tell me how i can read that file. actually when i am running code from eclipse i able to read it but when i am adding that jar file
problem while reading .csv file
problem while reading .csv file  I have a problem here..... i am reading a .csv extention file which has some value....but the problem is der is an amount column which contains , in between (eg) 3,899.00 which inturns creates

Ads