lets say we have a list of array items
ex:- a,b,c,d
which needs to be removed from a file which is full of data , I am missing something can anyone please help me in achieving this , thanks in advance
public static void rmvFromXML(String strFilePath,
String strTmpFilePath) throws IOException {
String currentLine = "";
List<String> list = new ArrayList<String>();
list.add("a");
list.add("b");
list.add("c");
list.add("d");
BufferedReader reader = new BufferedReader(new FileReader(strFilePath));
BufferedWriter fileWriter = null;
fileWriter = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(strTmpFilePath)));
while ((currentLine = reader.readLine()) != null) {
String trimmedLine = currentLine.trim();
System.out.println("Trimmed Line :- " + trimmedLine);
for (String value : list) {
System.out.println("Array Value:- " + value);
if (trimmedLine.equals(value))
continue;
fileWriter.write(trimmedLine + System.getProperty("line.separator"));
}
}
fileWriter.close();
reader.close();
}
you can use regex. so that you wont have to iterate and check whether the
line contains your strings
while ((currentLine = reader.readLine()) != null) {
Pattern removeWords = Pattern.compile("\\b(?:a|b|c|d)\\b\\s*", Pattern.CASE_INSENSITIVE);
Matcher fix = removeWords.matcher(currentLine);
String fixedString = fix.replaceAll("");
}
try doing it with above approach
input :
abcdefg
output
efg
You need to replace provided substrings on each occurrence in lines from file, so replace it with empty spaces:
public static void rmvFromXML(String strFilePath,
String strTmpFilePath) throws IOException {
String currentLine = "";
List<String> list = new ArrayList<>();
list.add("a");
list.add("b");
list.add("c");
list.add("d");
BufferedReader reader = new BufferedReader(new FileReader(strFilePath));
BufferedWriter fileWriter = null;
fileWriter = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(strTmpFilePath)));
while ((currentLine = reader.readLine()) != null) {
String trimmedLine = currentLine.trim();
System.out.println("Trimmed Line :- " + trimmedLine);
for (String value : list) {
System.out.println("Array Value:- " + value);
trimmedLine = trimmedLine.replaceAll(value, "");
}
fileWriter.write(trimmedLine + System.getProperty("line.separator"));
}
fileWriter.close();
reader.close();
}
So now for input:
sdfsdf
sdfsdf
sfsdfs
fa
a
b
c
asdasdad
d
asdasd
We get output:
sfsf
sfsf
sfsfs
f
ss
ss
Replace:
for (String value : list) {
System.out.println("Array Value:- " + value);
if (trimmedLine.equals(value))
continue;
fileWriter.write(trimmedLine + System.getProperty("line.separator"));
}
by:
bool found=false:
for (String value : list) {
System.out.println("Array Value:- " + value);
if (trimmedLine.equals(value))
found=true;
}
if(!found)
fileWriter.write(trimmedLine + System.getProperty("line.separator"));
The fileWriter.write call should be outside of the "for" loop.
Related
I created the following code to read a CSV-file:
public void read(String csvFile) {
try {
File file = new File(csvFile);
FileReader fr = new FileReader(file);
BufferedReader br = new BufferedReader(fr);
String line = "";
String[] tempArr;
while((line = br.readLine()) != null) {
tempArr = line.split(ABSTAND);
anzahl++;
for(String tempStr : tempArr) {
System.out.print(tempStr + " ");
}
System.out.println();
}
br.close();
} catch(IOException ioe) {
ioe.printStackTrace();
}
}
I have a CSV with more than 300'000 lines that look like that:
{9149F314-862B-4DBC-B291-05A083658D69};Gebaeude;TLM_GEBAEUDE;;Schiessstand;{41C949A2-9F7B-41EE-93FD-631B76F2176D};Altdorf 300m;offiziell;Hochdeutsch inkl. Lokalsprachen;Einfacher Name;;684600;295930;400
How can I now only get the some parts out of that? I only need the bold/italic parts to work with.
Without further specifying what your requirements/input limitations are the following should work within your loop.
String str = "{9149F314-862B-4DBC-B291-05A083658D69};Gebaeude;TLM_GEBAEUDE;;Schiessstand;{41C949A2-9F7B-41EE-93FD-631B76F2176D};Altdorf 300m;offiziell;Hochdeutsch inkl. Lokalsprachen;Einfacher Name;;684600;295930;400";
String[] arr = str.split("[; ]", -1);
int cnt=0;
// for (String a : arr)
// System.out.println(cnt++ + ": " + a);
System.out.println(arr[6] + ", " + arr[15] + ", " + arr[16]);
Note that this assumes your delimiters are either a semicolon or a space and that the fields desired are in the fix positions (6, 15, 16).
Result:
Altdorf, 684600, 295930
I am currently reading and writing to a text file and I cant figure out a way to sort. I thought I would be able to sort by pattern. I would like to sort a java string array by the pattern (0-9, A-Z, a-z). Basically I would like to ignore non-alphanumeric characters, sort with numbers preceding letters, and capital letters preceding lowercase letters (i.e., 0-9, A-Z, a-z). I would like to remove lines that only have non-alphanumeric characters.
File f1 = new File(fp);
FileReader fr = new FileReader(f1);
BufferedReader br = new BufferedReader(fr);
List<String> lines = new ArrayList<String>();
String line;
while ((line = br.readLine()) != null) {
count++;
// SORT GOES HERE
if (line.contains(sx)) {
line = line.replace(line, "");
}
if (yint > 0 && !line.isBlank()) {
line = line.substring(yint);
}
if(!line.isBlank()){
line = line.replace(line, count + " " + line + "\n");
lines.add(line);
} else {
lines.add(line);
}
}
fr.close();
br.close();
FileWriter fw = new FileWriter(f1);
BufferedWriter out = new BufferedWriter(fw);
for(String s : lines)
out.write(s);
out.flush();
out.close();
I would likely use something like Collections.sort() at the end and a simple check in the loop:
File f1 = new File(fp);
FileReader fr = new FileReader(f1);
BufferedReader br = new BufferedReader(fr);
List<String> lines = new ArrayList<String>();
String line;
while ((line = br.readLine()) != null) {
count++;
if (!line.matches("[a-zA-Z0-9]+")) {
continue;
}
if (line.contains(sx)) {
line = line.replace(line, "");
}
if (yint > 0 && !line.isBlank()) {
line = line.substring(yint);
}
if(!line.isBlank()){
line = line.replace(line, count + " " + line + "\n");
lines.add(line);
} else {
lines.add(line);
}
}
fr.close();
br.close();
Collections.sort(lines, (a, b) -> {
String aNum = a.replaceAll("[^a-zA-Z0-9]", "");
String bNum = b.replaceAll("[^a-zA-Z0-9]", "");
return a.compareTo(b);
});
FileWriter fw = new FileWriter(f1);
BufferedWriter out = new BufferedWriter(fw);
for(String s : lines)
out.write(s);
out.flush();
out.close();
EDIT: You can certainly make this work faster/better by quick-checking perhaps in the sort, etc - but generally this is the idea I think
You can't sort the file while you are reading it, in your case it needs to be done before:
// Sort the file
Path initialFile = Paths.get("myFile.txt");
List<String> sortedLines = Files.lines(initialFile)
.sorted()
.collect(Collectors.toList());
// Process the sorted lines
List<String> lines = new ArrayList<String>();
int count=0;
for(String line : sortedLines) {
System.out.println("l: "+line);
count++;
if (line.contains(sx)) {
line = line.replace(line, "");
}
if (yint > 0 && !line.isEmpty()) {
line = line.substring(yint);
}
if (!line.isEmpty()) {
System.out.println("line:"+line);
line = line.replace(line, count + " " + line + "\n");
System.out.println("new line:"+line);
lines.add(line);
} else {
System.out.println("add:"+line);
lines.add(line);
}
}
// Write output file
File f1 = new File("myFile.txt");
try(BufferedWriter out = new BufferedWriter( new FileWriter(f1))){
for (String s : lines)
out.write(s);
}
Try this.
static void sortByAlphaNumeric(String inFile, String outFile) throws IOException {
List<String> lines = Files.readAllLines(Paths.get(inFile)).stream()
.map(line -> new Object() {
String sortKey = line.replaceAll("[^0-9A-Za-z]", "");
String originalLine = line;
})
.filter(obj -> !obj.sortKey.equals(""))
.sorted(Comparator.comparing(obj -> obj.sortKey))
.map(obj -> obj.originalLine)
.collect(Collectors.toList());
Files.write(Paths.get(outFile), lines);
}
protected synchronized static void getRandomProxy(String srcFile) throws FileNotFoundException {
List<String> words = new ArrayList<>();
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader(srcFile));
String line;
while ((line = reader.readLine()) != null) {
words.add(line);
System.out.println(line);
}
int k = 0;
for (int i = 0; i < words.size(); i++) {
k++;
String[] splitted = words.get(i).split(":");
String ip = splitted[0];
String port = splitted[splitted.length - 1];
// System.out.println(k + " " + ip + " * " + port);
}
} catch (IOException iOException) {
} finally {
try {
reader.close();
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
I want to get output printed without empty lines .
These are kind of results am getting Like :
result 1.
result 2.
result 3.
i want output like :
result 1.
result 2.
result 3.
without blank lines.
Don't add the String to the list if it's empty :
if(!line.trim().isEmpty()) {
words.add(line);
System.out.println(line);
}
If you still want to add the blank lines to the list but don't display them, just move the condition :
words.add(line);
if(!line.trim().isEmpty())
System.out.println(line);
Doc
Use System.out.print. Note that the file contains a newline char at the end of each line.
If srcFile is created with Notepad, try removing first the carriage return char System.out.print(line.replaceAll("\\r",""))
ArrayList<String> words = new ArrayList<>();
BufferedReader reader = null;
try {
reader = new BufferedReader(new FileReader(srcFile));
String line;
while ((line = reader.readLine()) != null) {
line = line.trim(); // remove leading and trailing whitespace
if (!line.isEmpty() && !line.equals("")) {
words.add(line);
System.out.println(line);
}
}
I have a text file like this:
Emma,F,20355
Olivia,F,19553
Sophia,F,17327
Ava,F,16286
Isabella,F,15504
Mia,F,14820
Abigail,F,12311
Emily,F,11727
I am trying to remove words after , and also put two lines in one line for every two lines.
For example:
Emma Olivia
Sophia Ava
Isabella Mia
Abigail Emily
The program can do the first part, but I don't know how the program can do the second part. I can split the words and numbers after first ,, but I got stuck how I can can arrange lines.
Here is the code:
BufferedReader reader = new BufferedReader(new FileReader(inputFile));
BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile));
String currentLine;
String[] a;
String res;
while ((currentLine = reader.readLine()) != null) {
a = currentLine.split(",");
res = a[0] + "\n";
writer.write(res);
}
writer.close();
reader.close();
I think I need to create a for loop inside while loop, but I am not sure what to write to count even or odd lines.
Change to to something like this :
int count = 1;
while ((currentLine = reader.readLine()) != null) {
a = currentLine.split(",");
res = a[0] + count % 2 == 0 ? "\n" : " ";
count++;
writer.write(res);
}
try (
BufferedReader reader = new BufferedReader(new FileReader(inputFile));
BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile))
) {
while (true) {
String line1 = reader.readLine();
if (line1 == null) {
break;
}
writer.write(line1.split(",", 2)[0]);
String line2 = reader.readLine();
if (line2 == null) {
writer.newLine();
break;
}
writer.write(" " + line2.split(",", 2)[0]);
writer.newLine();
}
}
int newLine = 1;
while ((currentLine = reader.readLine()) != null) {
a = currentLine.split(",");
if (newLine % 2 == 0)
res += a[0] + "\n";
else
res += a[0] + " ";
newLine++;
}
writer.write(res);
Try reading two lines in at the same time if there is a second line left in the reader.
Something like this:
BufferedReader reader = new BufferedReader(new FileReader(inputFile));
BufferedWriter writer = new BufferedWriter(new FileWriter(tempFile));
String currentLine;
String[] a;
String[] b;
String res;
while ((currentLine = reader.readLine()) != null) {
a = currentLine.split(",");
if (reader.hasNext()) {
b = reader.readLine().split(",");
res = a[0] + " " + b[0] + "\n";
} else {
res = a[0]+"\n";
}
writer.write(res);
}
writer.close();
reader.close();
As mentioned above, read in two lines at a time. Combine them, then split based on the delimiter (comma) - Should then be easy to write out new format to a text file (Maybe pop the results in a list, then iterate over the list to write it out.
This is not a complete solution, but should be enough for you to get the idea.
// Read two lines at a time
String currentLine = reader.readLine(); //Emma,F,20355
String nextLine = reader.readLine(); //Olivia,F,19553
String combinedLine = currentLine + "," + nextLine;
// split into separate elements
String[] elements = combinedLine.split(",");
List<String> newLines = new ArrayList<>();
newLines.add(elements[0] + " " + elements[3]);
for (final String line : newLines) {
// write to file
writer.write(res);
}
I want to write small java program to read data file first field and add seqcution number
Input file:
robert,190 vikign,...
robert,2401 windy,...
robert,1555 oakbrook,...
michell,2524 sprint,...
michell,1245 oakbrrok,...
xyz,2455 xyz drive,....
Output file should be:
robert,190 vikign,...,0
robert,2401 windy,...,1
robert,1555 oakbrook,...,2
michell,2524 sprint,...,0
michell,1245 oakbrrok,...,1
xyz,2455 xyz drive,....,0
Check first field when value change sequction number start back to 0 otherwise add sequction number by 1
here is my code:
public static void createseq(String str) {
try {
BufferedReader br = null;
BufferedWriter bfAllBWP = null;
File folderall = new File("Sort_Data_File_Out");
File[] BFFileall = folderall.listFiles();
for (File file : BFFileall) {
br = new BufferedReader(new FileReader(file));
String bwp = "FinalDataFileOut\\" + str;
bfAllBWP = new BufferedWriter(new FileWriter(bwp));
String line;
line = br.readLine();
String[] actionID = line.split("\\|");
String fullname = actionID[0].trim();
int seq = 0;
String fullnameb;
while ((line = br.readLine()) != null) {
actionID = line.split("\\|");
fullnameb = actionID[0].trim();
if(fullname.equals(fullnameb)) {
seq++;
}
else {
System.out.println(line + "======" + seq + "\n");
seq = 0;
fullname = fullnameb;
}
System.out.println("dshgfsdj "+line + "======" + seq + "\n");
}
}
}
catch(Exception letterproof) {
letterproof.printStackTrace();
}
}
The below code will fix the issue.I have updated the code if you face any pblm plz let me know :
Input :
robert,190 vikign,...
robert,2401 windy,...
robert,1555 oakbrook,...
michell,2524 sprint,...
michell,1245 oakbrrok,...
xyz,2455 xyz drive,....
Code :
public static void createseq() {
try {
File file = new File("d:\\words.txt"); //Hardcoded file for testing locally
BufferedReader br = new BufferedReader(new FileReader(file));
HashMap<String,Integer> counter = new HashMap<String, Integer>();
String line;
while((line = br.readLine())!= null)
{
String[] actionID = line.split(",");
String firstName = actionID[0];
if(counter.containsKey(firstName))
{
counter.put(firstName, counter.get(firstName) + 1);
}
else
{
counter.put(firstName,0);
}
System.out.println(line+" "+counter.get(firstName));
}
br.close();
} catch(Exception letterproof) {
letterproof.printStackTrace();
}
}
Ouput Come :
robert,190 vikign,... 0
robert,2401 windy,... 1
robert,1555 oakbrook,... 2
michell,2524 sprint,... 0
michell,1245 oakbrrok,... 1
xyz,2455 xyz drive,.... 0