I have a list of files in the directory C:\Users\Mahady\Desktop\Java 31122011\src\register\
they are like this....
100100545.txt
100545454.txt etc etc
in each file, file data are like this line by line:
Bob
1234
4834
London
9852
1
My question is, how do i read each files one by one in the directory and for each files read all lines except line 3. i would then like to merge this data in word and create letters. thanks
Detailed Answer....
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
public class FileRead {
public static void main(String[] args) {
FileReader fileReader = null;
BufferedReader bufferedReader = null;
try {
File folder = new File("C:/Users/Mahady/Desktop/Java 31122011/src/register/");
if (folder.isDirectory()) {
for (File file : folder.listFiles()) {
fileReader = new FileReader(file);
bufferedReader = new BufferedReader(fileReader);
String line = null;
int lineCount = 0;
while (null != (line = bufferedReader.readLine())) {
lineCount++;
if (3 != lineCount) {
System.out.println(line);
}
}
}
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (null != bufferedReader)
try {
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
Hope this would help you.
Try this:
File dir = new File("C:\\Users\\Mahady\\Desktop\\Java 31122011\\src\\register\\");
for (string fn : dir.list()) {
FileInputStream fstream = new FileInputStream(fn);
DataInputStream in = new DataInputStream(fstream);
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String strLine;
while ((strLine = br.readLine()) != null) {
System.out.println (strLine);
}
in.close();
}
Obviously, you will need to add exception handling code around this skeletal implementation.
Related
My Java project is located at C:\eclipse\workspace\cgw
Is it possible to read a text file located on C:\CGW\conexao\conexao.txt
File file = new File("C:\CGW\conexao\conexao.txt");
You can read a file anywhere on your computer, here is an example using Java BufferedReader
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
public class ReadFileExample1 {
private static final String FILENAME = "E:\\test\\filename.txt";
public static void main(String[] args) {
BufferedReader br = null;
FileReader fr = null;
try {
//br = new BufferedReader(new FileReader(FILENAME));
fr = new FileReader(FILENAME);
br = new BufferedReader(fr);
String sCurrentLine;
while ((sCurrentLine = br.readLine()) != null) {
System.out.println(sCurrentLine);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (br != null) br.close();
if (fr != null) fr.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
}
View tutorial useful to read from files.
I need to open and read a downloaded file using selenium and I'm not quite sure how to do it. I see answers that suggests to download the file in a selected location. Does my code really need to start from downloading the file to selected location or can it start directly after downloading?
After opening the file I must also read it. Can anyone give me an idea on how to do this? Thank you!
You can read file using following code :
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
public class ReadFileExample1 {
private static final String FILENAME = "E:\\test\\filename.txt";
public static void main(String[] args) {
BufferedReader br = null;
FileReader fr = null;
try {
fr = new FileReader(FILENAME);
br = new BufferedReader(fr);
String sCurrentLine;
br = new BufferedReader(new FileReader(FILENAME));
while ((sCurrentLine = br.readLine()) != null) {
System.out.println(sCurrentLine);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (br != null)
br.close();
if (fr != null)
fr.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
}
Hope it will help you.
You can use this line of code to handel download a file from chrome and forefox browser.
public static File waitForDownloadToComplete(File downloadPath, String fileName) throws Exception {
boolean isFileFound = false;
int waitCounter = 0;
while (!isFileFound) {
logger.info("Waiting For Download To Complete....");
for (File tempFile : downloadPath.listFiles()) {
if (tempFile.getName().contains(fileName)) {
String tempEx = FilenameUtils.getExtension(tempFile.getName());
// crdownload - For Chrome, part - For Firefox
if (tempEx.equalsIgnoreCase("crdownload") || tempEx.equalsIgnoreCase("part")) {
Thread.sleep(1000);
} else {
isFileFound = true;
logger.info("Download To Completed....");
return tempFile;
}
}
}
Thread.sleep(1000);
waitCounter++;
if (waitCounter > 25) {
isFileFound = true;
}
}
throw new Exception("File Not Downloaded");
}
}
I'm sort of new to Java and I'm learning about input validation methods but I'm struggling with an assignment that I'm trying to complete. Can someone help me? The following code is reading a file somewhere on your computer. I'm supposed to verify that the file path is correct with an input validation method. This is what I have so far:
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Scanner;
public class readFile {
public static void main(String[] args) {
Scanner scan = new Scanner(System.in);
System.out.print("Enter the name of your File: ");
String fileName = scan.nextLine();
File inputFile = new File(fileName);
BufferedReader reader = null;
try {
String sCurrentLine;
reader = new BufferedReader(new FileReader(inputFile));
while ((sCurrentLine = reader.readLine()) != null) {
System.out.println(sCurrentLine);
}
} catch (IOException e) {
e.printStackTrace();
System.out.print(e.getMessage());
} finally {
try {
if (reader != null)reader.close();
} catch (IOException ex) {
System.out.println(ex.getMessage());
ex.printStackTrace();
}
}
}
}
The easiest way to tell if the file path given is correct is to simply check if it exists:
if (inputFile.exists() && !inputFile.isDirectory()) {
// inputFile has a valid path.
}
Use following code checking.
File f = new File(filePathString);
if(f.exists() && !f.isDirectory()) {
// do something
}
I am noob in Java trying to to build a scraper in a Java which could do the following things.
Ability to read data from a CSV file.
Use the URIs in that file and scrape the complete App info from the Google Playstore.
Export the scraped data and other meta data from the CSV file into an XML file
Can any one guide me in this how to go from here ?
Till now I have made the following three classes
main.java (This is the main method where I call other two classes)
import java.io.IOException;
public class main {
public static void main(String[] args) throws IOException {
ReadCVS obj = new ReadCVS();
obj.run();
AppInfo obj1 = new AppInfo();
obj1.readFile();
}
}
ReadCVS.java (This file reads the CSV file and give the output in a txt file)
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.PrintStream;
public class ReadCVS {
public void run() {
// Replace the file path to the appropriate path.
String csvFile = "\\Desktop\\https---play_google_com-store-apps-details-id=.csv";
BufferedReader br = null;
String line = "";
String cvsSplitBy = ";";
try {
File file = new File("\\Desktop\\output.txt");
FileOutputStream fos = new FileOutputStream(file);
PrintStream ps = new PrintStream(fos);
System.setOut(ps);
br = new BufferedReader(new FileReader(csvFile));
while ((line = br.readLine()) != null) {
// use comma as separator
String[] country = line.split(cvsSplitBy);
System.out.println("URL = " + country[0] + " "
);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (br != null) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
System.out.println("Done");
}
}
AppInfo.java (This file reads the input from the saved output.txt and tries to out put in the console. But it is not currently working)
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
public class AppInfo {
public void readFile(){
String fileName = "\\Desktop\\output.txt";
//read file into stream, try-with-resources
try (BufferedReader br = new BufferedReader(new FileReader(fileName))) {
String line;
while ((line = br.readLine()) != null) {
System.out.println(line);
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
The problem is that whenever I try to run this code the program get hanged and does not terminate.
Can any one help me with my problem ?
I'm making a project where using java I / O
I have a file with the following data:
170631|0645| |002014 | 0713056699|000000278500
155414|0606| |002014 | 0913042385|000001220000
000002|0000|0000|00000000000|0000000000000000|000000299512
and the output I want is as follows:
170631
0645
002014
file so that the data will be decreased down
and this is my source code:
public class Tes {
public static void main(String[] args) throws IOException{
File file;
BufferedReader br =null;
FileOutputStream fop = null;
try {
String content = "";
String s;
file = new File("E:/split/OUT/Berhasil.RPT");
fop = new FileOutputStream(file);
br = new BufferedReader(new FileReader("E:/split/11072014/01434.RPT"));
if (!file.exists()) {
file.createNewFile();
}
while ((s = br.readLine()) != null ) {
for (String retVal : s.split("\\|")) {
String data = content.concat(retVal);
System.out.println(data.trim());
byte[] buffer = data.getBytes();
fop.write(buffer);
fop.flush();
fop.close();
}
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
I want is to generate output as above from the data that has been entered
File Input -> Split -> File Output
thanks :)
I think you forgot to mention what problem are you facing. Just by looking at the code it seems like you are closing the fop(FileOutputStream) every time you are looping while writing the split line. The outputStream should be closed once you have written everything, outside the while loop.
import java.io.*;
public class FileReadWrite {
public static void main(String[] args) {
try {
FileReader inputFileReader = new FileReader(new File("E:/split/11072014/01434.RPT"));
FileWriter outputFileWriter = new FileWriter(new File("E:/split/11072014/Berhasil.RPT"));
BufferedReader bufferedReader = new BufferedReader(inputFileReader);
BufferedWriter bufferedWriter = new BufferedWriter(outputFileWriter);
String line;
while ((line = bufferedReader.readLine()) != null) {
for (String splitItem : line.split("|")) {
bufferedWriter.write(splitItem + "\n");
}
}
bufferedWriter.flush();
bufferedWriter.close();
bufferedReader.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}