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January 28th, 2013, 09:52 AM
#1
How to replace a line in a file through jtextfield?
This is a program that allows the user to search for an item and then the program splits the items and stores them in 4 different textfields. However, below is a method for updating the retrieved items back to the file. The problem is whenever the user clicks on the update button, the line does update successfully, but the other lines in the file are deleted!
Iam using an arraylist to store the searched item and also temporary file to write the item and then renaming it.
Can someone help me please. Thanks in advance!
Code:
file.txt
ramal hotel1 10 uk
bren hotel2 20 france
gil hotel3 30 china
Code:
//Update to file
button9.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
try {
String stringSearch = textfield1.getText();
File filetemp = File.createTempFile("TempFileName", ".tmp", new File("/"));
BufferedWriter writer = new BufferedWriter(new FileWriter(filetemp));
File file = new File("file.txt");
BufferedReader bf = new BufferedReader(new FileReader(file));
int linecount = 0;
String line;
ArrayList<String> list = new ArrayList<String>();
while (( line = bf.readLine()) != null){
list.add(line);
linecount++;
int indexfound = line.indexOf(stringSearch);
if (indexfound > -1) {
String a = textfield1.getText();
String b = textfield2.getText();
String c = textfield3.getText();
String d = textfield4.getText();
String[] word = line.split("\t");
String firstword = word[0];
String secondword = word[1];
String thirdword = word[2];
String fourthword = word[3];
writer.write(line.replace("\t", "\t").replace(firstword, b).replace(secondword, c).replace(thirdword, d));
writer.flush();
}
writer.newLine();
}
writer.close();
bf.close();
filetemp.renameTo(file);
filetemp.deleteOnExit();
FileChannel src = new FileInputStream(filetemp).getChannel();
FileChannel dest = new FileOutputStream(file).getChannel();
dest.transferFrom(src, 0, src.size());
}catch (IOException e) {
System.out.println("IO Error Occurred: " + e.toString());
}
}
});
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January 29th, 2013, 05:30 PM
#2
Re: How to replace a line in a file through jtextfield?
Your program is only outputting the values in the text fields and so the rest of the file will be lost. You need to write out the values for the whole file.
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