Comparing contents of two text files

I know that I can copy all contents of the two files into two strings, and then do str1.equals(str2). Any better way to do it?

What kind of comparison do you want to do?
- Exact - the files must have the same size, and have the same bytes, like "fc /b" in Windows
The exact comparison is very easy to do: open the files as FileInputStreams and read both using byte buffers. Compare the byte buffers.
If you can't open both files at the same time (for instance, one of the files is in a diskette and the other file is in another diskette, and you have only one diskette drive) you could try checking the digest of the files (java.security.MessageDigest). If the digest values match, probably the files are equal. If the digest values don't match, certainly the files are different.
- Textual - you want to find differences between the files, and pinpoint them, like the "diff" command in Unix, or the "fc" command in Windows.
Textual comparison is not easy to do (you'll need to keep lists of matching lines, and figure out if some sequence of lines was moved, changed etc.); but you can find the source code for it in several places.

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How to compare content of two text file using StreamTokenizer

hi....
i have two text files...containg field like(name,number,scheme) and(number,date,value)... i want to create a third file containg field like (name,number,date,scheme,value) by using these two table. how to create

I think this code can solve your problem.
private static final String DELIM = ",";
* Compile two files.
* @param file1 String the input file 1
* @param file2 String the input file 2
* @param file3 String the output file
* @throws IOException error in reading/writing
public void compileFiles(String file1, String file2, String file3) throws
        IOException {
        BufferedReader reader1 = new BufferedReader(new InputStreamReader(
            new FileInputStream(file1)));
        BufferedReader reader2 = new BufferedReader(new InputStreamReader(
            new FileInputStream(file2)));
        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(
            new FileOutputStream(file3)));
        String line1 = reader1.readLine();
        String line2 = reader2.readLine();
        while (line1 != null && line2 != null) {
            writer.write(compileLines(line1, line2));
            writer.newLine();
            line1 = reader1.readLine();
            line2 = reader2.readLine();
        reader1.close();
        reader2.close();
        writer.close();
    private String compileLines(String line1, String line2) {
        StringTokenizer tok1 = new StringTokenizer(line1, DELIM);
        StringTokenizer tok2 = new StringTokenizer(line2, DELIM);
        String name = tok1.nextToken();
        String number = tok1.nextToken();
        String scheme = tok1.nextToken();
        // ignore number
        tok2.nextToken();
        String date = tok2.nextToken();
        String value = tok2.nextToken();
        StringBuffer buffer = new StringBuffer();
        buffer.append(name);
        buffer.append(DELIM);
        buffer.append(number);
        buffer.append(DELIM);
        buffer.append(date);
        buffer.append(DELIM);
        buffer.append(scheme);
        buffer.append(DELIM);
        buffer.append(value);
        return buffer.toString();
    }

Compare two text files in Powershell and if a name is found in both files output content from file 2 to a 3rd text file

Is it possible using PowerShell to compare the contents of two text files line by line and if a line is found output that line to a third text file?
Lets say hypothetically someone asks us to search a text file named names1.txt and when a name is found in names1.txt we then pair that with the same name in the second text file called names2.txt
lets say the names shown below are in names1.txt
Bob
Mike
George
Lets say the names and contents shown below are in names2.txt
Lisa
Jordan
Mike 1112222
Bob 8675309
Don
Joe
Lets say we want names3.txt to contain the data shown below
Mike 1112222
Bob 8675309
In vbscript I used search and replace commands to get part of the way there like this
Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objFile = objFSO.OpenTextFile("testing.txt", ForReading)
strText = objFile.ReadAll
objFile.Close
strNewText = Replace(strText, "Mike ", "Mike 1112222")
Set objFile = objFSO.OpenTextFile("testing.txt", ForWriting)
objFile.WriteLine strNewText
objFile.Close
That script works great when you know the name you are looking for and the correct values. Lets say someone gives you a list of 1000 employees and says import these names into a list in the correct format and one sheet has the correct names only and
the other sheet has lots of extra names say 200000 and you only need the 1000 you are looking for in the format from names2.txt.

Sure,
Here's a simple one:
$names1 = "C:\names1.txt"
$names2 = "C:\names2.txt"
$names3 = "C:\names3.txt"
Get-Content $names1 | ForEach-Object {
$names1_Line = $_
Get-Content $names2 | Where-Object {$_.Contains($names1_Line)} | Out-File -FilePath $names3 -Append
This basically just reads $names1 file, line by line, and then read $names2 file line by line as well.
If the line being evaluated from $names2 file contains the line being evaluated from $names1 file, then the line from $names2 file gets output to $names3 file, appending to what's already there.
This might need a few more tinkering to get it to perform faster etc depending on your requirements. For example:
- If either $names1 or $names2 contain a lot of entries (in the region of hundreds) then it will be faster to load the whole content of $names2 into memory rather than opening the file, reading line by line, closing and then doing the same for every single
line in $names1 (which is how it is currently works)
- Make sure that your comparison is behaving as expected. The .Contains method always does a case sensitive comparison, this might not be what you are after.
- You might want to put a condition to ignore blank lines or lines with spaces, else they'll also be brought over to $names3
Hopefully this will get you started though and ask if you have further questions.
Fausto

Compare two text file

i am comparing two text file by checking occurance of a line in file 1 by comparing it with each line in file 2(not line by line)
i have to print in 3rd text file as difference
please see my progrm and tell me modification required
package comp.vnet.comparator;
import java.io.*;
import comp.vnet.comparator.NewFile;
class FileComparator {
     public static void main(String[] args) throws IOException{
          String file1,file2,String1,String2;
          BufferedReader br1,br2;
          int fileCount1=0;
          int fileCount2=0;
          br1= new BufferedReader(new InputStreamReader (System.in));
          // File file = new File ("output.txt");
          FileWriter fstream = new FileWriter("out.txt");
          // FileOutputStream fo = new FileOutputStream("E:/Filecomparator/FileComparator/output.txt");
          System.out.println("Enter First file name");
          file1="b.txt";
          //file1=br1.readLine();
          System.out.println("Enter Second file name");
          file2="a.txt";
          //file2=br2.readLine();
          NewFile nf= new NewFile();
          br1=nf.creatingFile(file1);
          br2=nf.creatingFile(file2);
while ((String1= br1.readLine()) != null) {
     fileCount1++;
while ((String2= br2.readLine()) != null) {
     fileCount2++;
System.out.println("fileCount1+ : " + fileCount1);
System.out.println("fileCount2+ : " + fileCount1);
br1=nf.creatingFile(file1);
BufferedWriter out = new BufferedWriter(fstream);
for(int i=0;i<=fileCount1;i++)
     br2=nf.creatingFile(file2);
     String1=br1.readLine();
     for(int j=0;j<fileCount2;j++)
               String2=br2.readLine();
                    if ( String1.equals (String2) ) {
                         System.out.println("the line is equal");
                    else{
                    out.write(String1);
                         System.out.println(String1);
out.close();
br1.close();
br2.close();
          }

thanks alot for that reply
but there is some error
pleasse send me a nice reply

Comparing two text files in a UNIX using shell programming

Hi All,
Sorry for posting a UNIX shell query on Database forums.
I want to compare two text files using shell programming. The two text files are actually Business Objects output extracted in a text format. The two output files are not in a tabular format and are no way similar in looking. I want to take one file e.g. file1 as an input file and compare each line of file1 with the other file e.g. file2. During comparison I want to extract the differences found in another file and if possible the similar data as well.
Below is how the files will look like
File 1:
BILL1000000 1111251 122222
RMG1A2 023425100000000010001 11135 102650111100
UHL1 *6999999* *454540001* Weekly *000*
0544424556895PS DATA 01MPS100000/03 MR A A PERTH UTL1234567893106923455053106900000010000005
File 2:
AUTO
APPLICATION=STARTPOINT
START
PROCESSING DATE=01012011
1598301270320099TEST C E 00000031615 123456
7854301276140499TES P 00000062943 234567
UHL1 *6999999* *454540001* Weekly *000*
5569931233333499/123456789 00000013396 345678
4471931233333499ER K J 00000031835123456789012456789
33652931233333499E J L 00000034729123456789012567890
45783123333349921/123456789 00000039080 678901
1452931233333499T R 00000040678123456789012789012
59689312333334994/987654321 00000048614 890123
4112931233333499/987654321 00000060631 901234
1236931217836899 K S 00000043704 012345
END
As you can see above the file are not at all matching except for one record UHL1, but its just an example. As an output I would like to have a third file containing all these records, highlighting the differences, and a fourth file where in only the matched records should get populated.
Please post any useful scripts related to the above scenario.
Many Thanks.
Edited by: 848265 on 06-Apr-2011 04:13

Hi;
For your issue i suggest close your thread here as changing thread status to answere and move it to Forum Home » Linux which you can get more quick response
Regard
Helios

How do i split content from the text file using tab and spaces...?

Hi.. Just want to ask help to all the experts. Im new in java and i have this problem on how to split the contents of the text file. ill show you the contents in order to let you see what i mean.
FileName: COL.txt
AcctNo AcctName Primary Secondary Status Opendate
121244 IPI Company Noel Jose Active 12/05/2007
As you can see the content i want to split it per column.. Please help me

Jose_Noel wrote:
Hi prometheuzz,
What do you mean by one thread...?You created two threads* with the same question in it. That way, people might end up giving you an answer that has already been posted in your other thread: thus wasting that person's time.
Just don't create multiple threads with the same question please.
* a thread is a post here at the forum

How to read the content of a text file (by character)?

Guys,
Good day!
I'm back just need again your help. Is there anyone knows how to read the content of a text file not by line but by character.
Please help me. Thank you so much in advance.
Jojo

http://java.sun.com/javase/6/docs/api/index.html
package java.io
InputStream.read(): int
Reads the next byte of data from the input stream.
Implementation:
InputStreamReader
An InputStreamReader is a bridge from byte streams to character streams: It reads bytes and decodes them into characters using a specified charset. The charset that it uses may be specified by name or may be given explicitly, or the platform's default charset may be accepted.

How to store the contents of a text file directly in to a clob field

Hi All,
Could anyone help me to store the contents of a text file (*.txt,*.xml etc)directly in to a clob field.
Thanks in advance
Jayaram.

One way is to use sqlloader. Three files are used. A control file, an xml data file, and a file with the path of the xml data file. Here's the control file. It reads load.file, which is the file with the path of the xml data file. It names the path ext_path, and inserts the xml into field xml_field.
CONTENTS OF CONTROL FILE:
load DATA
INFILE 'load.file'
APPEND
INTO TABLE xml_table
( ext_path FILLER CHAR(13),
"XML_FIELD" LOBFILE(ext_fname) TERMINATED BY EOF
CONTENTS OF FILE LOAD.FILE:
/tmp/load.dat
The xml is in the file /tmp/load.dat.
null

How to modify the contents of a text file stored along with a midlet

Hi,
I have been developing a application in j2me wherein i need to first read the contents of the text file stored along with the midlet and later erase the existing content and update it with some text.
I was able to read the file in the following manner
InputStream is = getClass().getResourceAsStream("myfile.txt");
Now i need to erase the contents and then update it the new content, how do i do it. Kinldy please help me out. It is very urgent.
Thanks

Didn't you hear me the first time?
http://forum.java.sun.com/thread.jspa?threadID=701360&messageID=4068435#4068435

How to read two text files using the Read from spreadsheet.vi and then plot it

I need to read two text files using the read from spreadsheet function and then plot these files over time.
The file with the .res extention is the RMS values (dt and df) and the second file contains the amplitude of a frequency spectrum.
I really appreciate any help..thanks
Attachments:
RMS.txt ‏1 KB
FREQUENCY.txt ‏1 KB

From NI Example Finder:
Write to Text File.vi
Read from Text File.vi
Jean-Marc
LV2009 and LV2013
Free PDF Report with iTextSharp

Function module for comparing contents of two internal tables

Hi All,
Is there any function module to compare contents of two internal tables of same structure?
If yes please let me know.
Thanks in advance.
Amol

Hi
call SE16 with table TFTIT in order to get a full list (it will be long...)
A list of FMs with parameters can be found in table FUNCT.
Finally go to sm37rsdf4
that will give you all the function modules with description
Here is the list:
http://www.erpgenie.com/abap/functions.htm
hope this helps...
Regards
CSM Reddy

Merging of two text files

HI All,,
I have a text file A with four fields and text file B with two fields. I wanted to club these two text files to a single text file with certain condition and that to be uploaded to a standard table through BDC.
am I clear??
Please suggest me how can I proceed for this.
thanks,
anil.

Hi
If you want to do this using a program
Then use Function Module
GUI_UPLOAD
to load the two text files into two internal tables
say itab1 for one with 4 fields
and itab2 for the one with 2 fields
Then you can join the two tables based on a key between the two into a final internal table with six fields
use the function module GUI_DOWNLOAD to download the internal tab with six fields and you have the final file which you would need to upload for the BDC.
Here also you can use GUI_UPLOAD to load the text file for the BDC program

Displaying contents of a text file in a text box

As the topic describes, I need to display the contents of a
text file in a text box. How would one go about doing this? Thanks
in advance.

// setting up the text format options
var FileFormat:TextFormat = new TextFormat ();
FileFormat.font = "Verdana";
FileFormat.size = 12;
FileFormat.align = "left";
FileFormat.color = 0xFFFFFF;
/// load in text from folder load_in , filename is text.txt
var my_lv:LoadVars = new LoadVars();
my_lv.onLoad = function (success:Boolean):Void{
if (success){
textfield.text = this.txtVarLoaded;
textfield.setTextFormat ( FileFormat );
} else {
trace ("error");
my_lv.load ("load_in/text.txt"); // load in text.txt
peace ;o)

Want to display the contents of a text file in a jsp

hi
i am new to jsp, i want to display the contents of a text file in a jsp file ,whenever jsp file is loaded from browser.
-thanx

i had come up with the code

<%@ page import="java.io.*, java.lang.*" %>
<%@ page language="java" %>
<html>
<head>
<title>Display</title>
</head>
<body>
<%
String sample[100];
String line;
%>
<%! int i=0; %>
<%!File f1 = new File("c:\\file.txt"); %>
<% try { %>
<%!FileReader fi = new FileReader(f1); %>
<% } catch(FileNotFoundException io) { } %>
<%!BufferedReader in = new BufferedReader(fi); %>
<%
while((line=in.readLine())!= null)
sample= line;
i++;
in.close();
%>
i will display sample here
</body>
</html>
but i am getting error
display_jsp.java:16: unreported exception java.io.FileNotFoundException;
must be caught or declared to be thrown
FileReader fi = new FileReader(f1);
^
plz help
-thanx

How to convert content of a Text file to String?

Hi,
I need to read the content of a text file and convert it into String and display it on to a JSP file.
But the codings below don't work. Please advise me on how can i display the text file content.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
File adCheck = new File("list.txt");
fis = new FileInputStream(adCheck);
int Length = adCheck.length();
byte arr[] = new byte[Length];
int dataRead = 0;
int totalData = 0;
while(totalData <Length)
dataRead = fis.read(arr,totalData,Length);
totalData += dataRead;
String Content = new String(arr);//byte array converted to String
arr = null;

Take a BufferReader:
BufferedReader read = new BufferedReader(new FileReader("c:\test.txt");
String temp = read.readln();
You can make loops etc. Adding new Strings to an ArrayList,
adding Strings etc....

Comparing contents of two text files

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