Saving an integer array into a .txt file
hii, im only a beginner in java, so this is the only code i've learned so far for saving array elements into a file
public static void saveNames(String [] name) throws IOException
FileWriter file = new FileWriter("Example\\names.txt");
BufferedWriter out = new BufferedWriter(file);
int i = 0;
while (i < name.length)
if (name[i] != null)
out.write(name);
out.newLine();
i++;
out.flush();
out.close();
However, this is only used for string arrays; and i can't call the same method for an integer array (because it's not compatible with null)
I don't really understand this code either... since my teacher actually just gave us the code to use, and didn't really explain how it works
I have the same problem for my reading a file code as well --> it's only compatible with string
public static String [] readNames (String [] name) throws IOException
int x = 0;
int counter = 0;
String temp = "asdf";
name = new String [100];
FileReader file = new FileReader("Example\\names.txt");
BufferedReader in = new BufferedReader(file);
int i = 0;
while (i < array.length && temp != null) // while the end of file is not reached
temp = in.readLine();
if (temp != null)
name[i] = temp; // saves temp into the array
else
name[i] = "";
i++;
in.close(); // close the file
return name;
Could someone suggest a way to save elements from an integer array to a file, and read integer elements of that file?
Or if it's possible, replace null with a similar variable (function?), that is suitable for the integer array (i can't use temp != 0 because some of my elements might be 0)
Thanks so much!!!!!
because it's not compatible with nullI think it should be okay to just remove the null condition check since there are no null elements in a primitive array when writing.
Use Integer.parseInt() [http://java.sun.com/javase/6/docs/api/java/lang/Integer.html] to convert the String into an Integer when you read it back and use Integer.toString() to be able to write it as a String.
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import java.io.File;
import java.io.FileWriter;
import java.awt.image.*;
import java.io.*;
import java.util.*;
import javax.imageio.*;
import javax.imageio.stream.*;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
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protected int width,height;
// 'samples' stores the image pixel values.
protected int[][] samples;
// Constructor: Reads the image from the
// specified file name.
public Image(String filename)
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public int getHeight() { return height; }
// Reads the image from the specified file
// name into the 'samples' array. Throws an
// exception if the image is stored in an
// unsupported file format (currently only
// .GIF, .JPG, and .PNG are supported by Sun).
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throws Exception {
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getImageReadersBySuffix(ext);
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imageReader = (ImageReader)
imageReaders.next();
// If we get here we cannot decode the image.
else throw new IIOException
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// Create a file input stream object to
// read the image date.
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new FileImageInputStream(fileImage);
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imageReader.setInput(imageInputStream);
// Get the width and height of the image.
width = imageReader.getWidth(0);
height = imageReader.getHeight(0);
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imageReader.read(0);
imageInputStream.close();
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// pixel data from the BufferedImage.
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throws Exception {
// Extract the file name suffix.
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(filename.indexOf('.')+1);
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// Get a list of ImageWriters that claim to
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// image file format based on the file name
// suffix.
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getImageWritersBySuffix(ext);
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if (imageWriters.hasNext())
imageWriter = (ImageWriter)
imageWriters.next();
// If we get here we cannot encode the image.
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// write the image data.
FileImageOutputStream imageOutputStream
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(fileImage);
// Tell the ImageWriter to use our file
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imageWriter.setOutput
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// The ImageWriter.write() method expects a
// BufferedImage. Convert our 'samples' array
// into a BufferedImage.
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createBufferedImage();
// Encode the image to the output file.
imageWriter.write(bufImage);
imageOutputStream.close();
// Draws the image stored in the 'samples'
// array on the specified graphics context.
public void draw(Graphics gc,int x,int y){
BufferedImage bufImage =
createBufferedImage();
gc.drawImage(bufImage,x,y,null);
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private BufferedImage
createBufferedImage() {
// Create a monochrome BufferedImage object.
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BufferedImage(width,height,
BufferedImage.TYPE_BYTE_GRAY);
// Create a WriteableRaster object so we can
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bufImage.getRaster();
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for (int row = 0; row < height; row++)
for (int col = 0; col < width; col++)
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return bufImage;
} // End of Class Image
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public static void main(String args[])
throws Exception {
// Create a frame to display the image.
Frame frame = new Frame("Test Image");
frame.setSize(1024,768);
frame.setVisible(true);
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int height=img.getHeight();
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//�my_problem_to_be_resolved.�
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int k = 0;
for(int i = 0; i <= width; i++) {
for(int j = 0; j <= height; j++) {
intPixels1[k] = img.samples[i][j];
int_image_object_arry_stream.writeInt((int) intPixels1[k]);
// System.out.println(intPixels1[k]);
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import java.awt.*;
import java.io.File;
import java.io.FileWriter;
import java.awt.image.*;
import java.io.*;
import java.util.*;
import javax.imageio.*;
import javax.imageio.stream.*;
import java.awt.image.Raster;
import java.awt.image.WritableRaster;
class Image {
protected int width,height;
// 'samples' stores the image pixel values.
protected int[][] samples;
// Constructor: Reads the image from the
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public Image(String filename)
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public int getWidth() { return width; }
// Returns the pixel height of the image.
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throws Exception {
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String ext = filename.substring
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// to be able to decode this image file
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// Get a list of ImageWriters that claim to
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getImageWritersBySuffix(ext);
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// Grab the first ImageWriter in the list.
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imageWriters.next();
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// Create a file output stream object to
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FileImageOutputStream imageOutputStream
= new FileImageOutputStream
(fileImage);
// Tell the ImageWriter to use our file
// output stream object.
imageWriter.setOutput
(imageOutputStream);
// The ImageWriter.write() method expects a
// BufferedImage. Convert our 'samples' array
// into a BufferedImage.
BufferedImage bufImage =
createBufferedImage();
// Encode the image to the output file.
imageWriter.write(bufImage);
imageOutputStream.close();
// Draws the image stored in the 'samples'
// array on the specified graphics context.
public void draw(Graphics gc,int x,int y){
BufferedImage bufImage =
createBufferedImage();
gc.drawImage(bufImage,x,y,null);
// Converts the 'samples' array into a
// BufferedImage object. Students do not have
// to understand how this works.
private BufferedImage
createBufferedImage() {
// Create a monochrome BufferedImage object.
BufferedImage bufImage = new
BufferedImage(width,height,
BufferedImage.TYPE_BYTE_GRAY);
// Create a WriteableRaster object so we can
// put sample data into the BufferedImage
// object's raster.
WritableRaster wRaster =
bufImage.getRaster();
// Copy the 'samples' data into the
// BufferedImage object's raster.
for (int row = 0; row < height; row++)
for (int col = 0; col < width; col++)
wRaster.setSample
(col,row,0,samples[row][col]);
// Return the newly created BufferedImage.
return bufImage;
} // End of Class Image
/*class TestImage {
public static void main(String args[])
throws Exception {
// Create a frame to display the image.
Frame frame = new Frame("Test Image");
frame.setSize(1024,768);
frame.setVisible(true);
Graphics gc = frame.getGraphics();
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System.out.println
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public static void main(String args[])
throws Exception {
// Create a frame to display the image.
Frame frame = new Frame("Test Image");
frame.setSize(1024,768);
frame.setVisible(true);
Graphics gc = frame.getGraphics();
try {
// Read the image from the file.
Image img = new Image("C:/lilies.jpg");
int height=img.getHeight();
int width =img.getWidth();
File image_object_arry=new File("C:/Image_array.txt");
FileOutputStream image_object_arry_stream=new FileOutputStream(image_object_arry);
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//Conversion of two dimensional pixel arrry into one dimensional array
int intPixels1[] = new int [height * width];
int k = 0;
for(int i = 0; i <= width; i++) {
for(int j = 0; j <= height; j++) {
intPixels1[k] = img.samples[i][j];
int_image_object_arry_stream.writeInt((int) intPixels1[k]);
// System.out.println(intPixels1[k]);
k = k+1;
catch (Exception e) {
System.out.println("Exception in main() "+e.toString());
catch (Exception e) {
System.out.println("Exception in main() "+e.toString());
}My Friend, you need to put your code within CODE tags
And I suspect if anyone would go through your code this way.
Assuming your problem is to write pixel values to a file you may use this,
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hope it helps
Regards
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way to link to a Javascript (.js) that would be in the same folder
as the .exe? Or would there be a way to incorporate the Javascript
right into the .exe?
Let me know if any of you have a solution for that.
Thanks!
http://livedocs.adobe.com/flash/9.0/main/wwhelp/wwhimpl/common/html/wwhelp.htm?context=Liv eDocs_Parts&file=00000342.html#wp126566 -
How can I convert an array into a .wav file?
I have an array of points that I need converted and written into a .wav file. Any help?
Indeed there is!
Look at the attached vi....that's about all there is to it!
Good Luck..
Eric
Eric P. Nichols
P.O. Box 56235
North Pole, AK 99705
Attachments:
ARRAY_TO_WAVE.vi 17 KB -
Saving a CSV report output as TXT file
Hi,
We are generating reports on the web using Intenet Explorer. The report is a CSV report, i.e. the data displayed is comma separated. After generating the report, we need to save it as TXT file.
If the length of a line is long (let us say more than 80 chars) while saving it as TXT file, it is saving as 2 lines. If the length of a line is less, then it is saving in a single line.
How can I avoid this 2 line problem?
I am not facing this problem if I generate report with Netscape browser and save as TXT file.
We are using Reports 6i.
Thanks in Advance,
SrinivasHello,
I had the same problem. And I think what I did to fix it is I made the mode=charcter, batch=yes, and background=yes. Hope this helps.
Martin -
hi every1, any1 can help plz, how to write bytes from an audio file (which is stored in an array) back into a wave file thanx
Hi,
it is something like this:
byte[] myByteArray; //your bytearray
AudioFormat myAudioFormat; //neccessary to interpret the bytes in the right manner
long mySampleFrameLength; //how long your audiodata is
AudioInputStream ais = new AudioInputStream(new ByteArrayInputStream(myByteArray), myAudioFormat, mySampleFrameLength);
AudioSystem.write(ais, AudioFileFormat.Type.WAVE, new File("myWaveFile.wav")); -
How to write records from a resultset into a txt file ???
Hi, I am a newbie in java servlet technology. Currently, I am having a problem regarding how to write all my records from within a resultset into a text file.
First, I put all my records into a string variable and then append the string into a stringbuffer. After that, I create a bufferoutputstream and used the write method to write into a text file. Below are the code I used in my program.
Connection connection = null;
Statement statement = null;
ResultSet resultset = null;
// Connect to database
connection = getConnection();
StringBuffer str_buf = new StringBuffer();
statement = connection.createStatement();
resultset = statement.executeQuery("SELECT * FROM STUDENT");
String data_row = "";
str_buf.append("STUDENT_ID,NAME,PHONE,ADDRESS,RESULT");
while (resultset.next()) {
data_row = "\n";
data_row += resultset.getLong("STUDENT_ID");
data_row += ",\"" + resultset.getString("NAME").trim() + "\"";
data_row += ",\"" + resultset.getString("PHONE").trim() + "\"";
data_row += ",\"" + resultset.getString("ADDRESS").trim() + "\"";
data_row += ",\"" + resultset.getString("RESULT").trim() + "\"";
str_buf.append(data_row);
BufferedOutputStream buf_out = null;
// Create a folder and write all records into info.txt
String fileName = "student/info.txt";
buf_out = new BufferedOutputStream(new FileOutputStream(fileName));
int str_len = str_buf.length();
for (int i = 0; i < str_len; i++) {
buf_out.write(str_buf.charAt(i));
}So. is this a proper way to write information into a text file ?
The total records are around 150 000. Now, I get an exception which is "XServletError : System.lang.outofmemory". It happen if the total records are more than 60 000, within a while loop when I try to append a string into a stringbuffer.
How should I deal with this kind of situation?
Thanks in advanced and any advice is appreciated. Example is even better to improve understanding.
ThanksConnection connection = null;
Statement statement = null;
ResultSet resultset = null;
// Connect to database
connection = getConnection();
StringBuffer str_buf = new StringBuffer();
String fileName = "student/info.txt";
FileWriter fw = new FileWriter(fileName);
statement = connection.createStatement();
resultset = statement.executeQuery("SELECT * FROM
STUDENT");
String data_row = "";
fw.write("STUDENT_ID,NAME,PHONE,ADDRESS,RESULT");
while (resultset.next()) {
data_row = "\n";
data_row += resultset.getLong("STUDENT_ID");
data_row += ",\"" + resultset.getString("NAME").trim()
+ "\"";
data_row += ",\"" +
resultset.getString("PHONE").trim() + "\"";
data_row += ",\"" +
resultset.getString("ADDRESS").trim() + "\"";
data_row += ",\"" +
resultset.getString("RESULT").trim() + "\"";
fw.write(data_row);
fw.close();
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