One web project I'm involved in requires generating a CSV to the user.
One field is notes and there can be multiple notes in the field, separated by a return (alt-enter in Excel), appearing as
A USER entered on 02/17/2023: Test note
A USER entered on 02/17/2023: This is another note
Is it possible to insert control codes into a Java string that Excel will pick up and format the cell properly?
For what it's worth, this was my attempt:
}else if (formType.equalsIgnoreCase("downloadCSV")) {
Date d = new Date();
String filename = "C:/temp/rtTmp" + d.getTime() + ".csv";
File f = new File(filename);
List<Contact> contactList = RetentionTrackDatabaseUtil.getContacts();
BufferedWriter bw = new BufferedWriter(new FileWriter(f));
bw.write("name,"
+ "gender,"
+ "age,"
+ "DOB,"
+ "DOH,"
+ "DOR,"
+ "DOS,"
+ "dateContact,"
+ "reason,"
+ "status,"
+ "empNum,"
+ "shift,"
+ "phone,note(s)\n");
for (Contact c : contactList) {
System.out.println(c.getAge());
bw.append("\"" + c.getName() + "\"" + ","
+ c.getGender() + ","
+ Integer.toString(c.getAge()) + ","
+ (c.getDOB()!=null?RetentionTrackUtil.sdf.format(c.getDOB()):"") + ","
+ (c.getDOH()!=null?RetentionTrackUtil.sdf.format(c.getDOH()):"") + ","
+ (c.getDOR()!=null?RetentionTrackUtil.sdf.format(c.getDOR()):"") + ","
+ (c.getDOS()!=null?RetentionTrackUtil.sdf.format(c.getDOS()):"") + ","
+ (c.getDateContact()!=null?RetentionTrackUtil.sdf.format(c.getDateContact()):"") + ","
+ c.getReason() + ","
+ c.getStatus() + ","
+ c.getEmpNum() + ","
+ c.getShift() + ","
+ c.getPhone() + ",");
for(Note n: c.getNoteList()){
bw.append("(" + n.getEnteredBy() + " on " + RetentionTrackUtil.sdf.format(n.getNoteDate()) + ")" + n.getNote() + "\\n");
}
bw.append("\n");
}
bw.close();
sendFile(response, filename);
}
How to get value https://example1.com/2147414277.mp4?md5=OFvyZ55egHb4A5hUZJvSEQ&time=1580513886&ip=176.9.117.35 in this script?
the first Link value https://example.com/2147414277.mp4?md5=OFvyZ55egHb4A5hUZJvSEQ&time=1580513886 just does not work.
String html ="<script>function getcookie(Name){\n" +
" var search=Name+\"=\";\n" +
" if(document.cookie.length>0){\n" +
" offset=document.cookie.indexOf(search)\n" +
" if(offset!=-1){\n" +
" offset+=search.length\n" +
" end=document.cookie.indexOf(\";\",offset)\n" +
" if(end==-1){end=document.cookie.length}\n" +
" return unescape(document.cookie.substring(offset, en))\n" +
" }\n" +
" }\n" +
"}\n" +
" var player = new Playerjs({\n" +
" \"id\":\"player\",\n" +
" \"poster\":\"https://media.example.com/img/2147414277.jpg\",\n" +
" \"file\":\"[SD (480p)]https://example.com/2147414277.mp4?md5=OFvyZ55egHb4A5hUZJvSEQ&time=1580513886 or https://example1.com/2147414277.mp4?md5=OFvyZ55egHb4A5hUZJvSEQ&time=1580513886&ip=176.9.117.35,[HD (720р)]https://example2.com/720/2147414277.mp4?md5=GXD4cKVnM5RVY363Uxn9ww&time=1580513886 or https://exampl3.com/720/2147414277.mp4?md5=GXD4cKVnM5RVY363Uxn9ww&time=1580513886&ip=190.9.117.35\",\n" +
" \"default_quality\":\"SD (480p)\"\n" +
" });\n" +
" function PlayerjsEvents(event,id,data){\n" +
" if(event==\"start\"){\n" +
" var xhttp = new XMLHttpRequest();\n" +
" xhttp.open(\"GET\", \"stat.php?id=2147414277\", true);\n" +
" xhttp.send();\n" +
" }\n" +
" if(event==\"end\"){\n" +
" \n" +
" }\n" +
" }</script>";
Pattern p = Pattern.compile("file\"",Pattern.DOTALL);
String url = "";
for (Element element : script) {
Matcher m = p.matcher(element.data());
if (m.find()){
url = m.group(1);
}
}
System.out.println(url);
I don’t really understand how the Java Regex Pattern works. I tried to find this URL many times but I'm failed.
I would be grateful if someone will help with that or at least give me a link guide of java regex for a newbie. thx
It seems to me you are trying to extract URLs from JS code using java.
There are many regex playgrounds on the web you can try such as:
http://buildregex.com
https://regex101.com
and of course Google
Search.
For your specific case :
import java.util.*;
import java.util.regex.*;
import java.net.*;
public class HelloWorld{
public static void main(String []args){
System.out.println("Hello World");
String jsCode ="<script>function getcookie(Name){\n" +
" var search=Name+\"=\";\n" +
" if(document.cookie.length>0){\n" +
" offset=document.cookie.indexOf(search)\n" +
" if(offset!=-1){\n" +
" offset+=search.length\n" +
" end=document.cookie.indexOf(\";\",offset)\n" +
" if(end==-1){end=document.cookie.length}\n" +
" return unescape(document.cookie.substring(offset, en))\n" +
" }\n" +
" }\n" +
"}\n" +
" var player = new Playerjs({\n" +
" \"id\":\"player\",\n" +
" \"poster\":\"https://media.example.com/img/2147414277.jpg\",\n" +
" \"file\":\"[SD (480p)]https://example.com/2147414277.mp4?md5=OFvyZ55egHb4A5hUZJvSEQ&time=1580513886 or https://example1.com/2147414277.mp4?md5=OFvyZ55egHb4A5hUZJvSEQ&time=1580513886&ip=176.9.117.35,[HD (720р)]https://example2.com/720/2147414277.mp4?md5=GXD4cKVnM5RVY363Uxn9ww&time=1580513886 or https://exampl3.com/720/2147414277.mp4?md5=GXD4cKVnM5RVY363Uxn9ww&time=1580513886&ip=190.9.117.35\",\n" +
" \"default_quality\":\"SD (480p)\"\n" +
" });\n" +
" function PlayerjsEvents(event,id,data){\n" +
" if(event==\"start\"){\n" +
" var xhttp = new XMLHttpRequest();\n" +
" xhttp.open(\"GET\", \"stat.php?id=2147414277\", true);\n" +
" xhttp.send();\n" +
" }\n" +
" if(event==\"end\"){\n" +
" \n" +
" }\n" +
" }</script>";
List<String> urls = new ArrayList<String>();
String myUrlPattern = "((https?|file):((//)|(\\\\))+[\\w\\d:##%/;$()~_?\\+-=\\\\\\.&]*)";
Pattern p = Pattern.compile(myUrlPattern);
Matcher m = p.matcher(jsCode);
while (m.find()) {
urls.add(m.group());
}
for(String s: urls)
System.out.println(s);
}
}
Gives out:
https://media.example.com/img/2147414277.jpg
https://example.com/2147414277.mp4?md5=OFvyZ55egHb4A5hUZJvSEQ&time=1580513886
https://example1.com/2147414277.mp4?md5=OFvyZ55egHb4A5hUZJvSEQ&time=1580513886&ip=176.9.117.35,
https://example2.com/720/2147414277.mp4?md5=GXD4cKVnM5RVY363Uxn9ww&time=1580513886
https://exampl3.com/720/2147414277.mp4?md5=GXD4cKVnM5RVY363Uxn9ww&time=1580513886&ip=190.9.117.35
Hope this helps!
I want the user to enter which row and which column in order to read the data in it
for example if the user enter row = 6 column = 0, it will print out Pw1
static String fullChessBoard[][] = {
{"Rb1", "Kb1", "Bb1", "Qb1", "Ab1", "Bb2", "Kb2", "Rb2"},
{"Pb1", "Pb2", "Pb3", "Pb4", "Pb5", "Pb6", "Pb7", "Pb8"},
{" ", " ", " ", " ", " ", " ", " ", " "},
{" ", " ", " ", " ", " ", " ", " ", " "},
{" ", " ", " ", " ", " ", " ", " ", " "},
{" ", " ", " ", " ", " ", " ", " ", " "},
{"Pw1", "Pw2", "Pw3", "Pw4", "Pw5", "Pw6", "Pw7", "Pw8"},
{"Rw1", "Kw1", "Bw1", "Qw1", "Aw1", "Bw2", "Kw2", "Rw2"},
};
System.out.println(Player1W + ", please make a move");
int row = scan.nextInt();
int column = scan.nextInt();
Try this code
import java.util.Scanner;
public class HelloChess{
static String fullChessBoard[][] = {
{"Rb1", "Kb1", "Bb1", "Qb1", "Ab1", "Bb2", "Kb2", "Rb2"},
{"Pb1", "Pb2", "Pb3", "Pb4", "Pb5", "Pb6", "Pb7", "Pb8"},
{" ", " ", " ", " ", " ", " ", " ", " "},
{" ", " ", " ", " ", " ", " ", " ", " "},
{" ", " ", " ", " ", " ", " ", " ", " "},
{" ", " ", " ", " ", " ", " ", " ", " "},
{"Pw1", "Pw2", "Pw3", "Pw4", "Pw5", "Pw6", "Pw7", "Pw8"},
{"Rw1", "Kw1", "Bw1", "Qw1", "Aw1", "Bw2", "Kw2", "Rw2"},
};
public static void main(String []args){
Scanner scan = new Scanner(System.in);
System.out.print("Enter Row: ");
int row = scan.nextInt();
System.out.print("Enter Column: ");
int column = scan.nextInt();
System.out.println("Result : "+fullChessBoard[row][column]);
scan.close();
}
}
I'm assuming this program you are writing is a command line program, where the user puts information into the command prompt and your program responds. If it's not, please let me know, as my answer operates under that assumption.
There's more than one way to get input from the command line in Java. The following link has a few great examples:
[https://www.geeksforgeeks.org/ways-to-read-input-from-console-in-java/][1]
Here's a quick example I chalked up that outputs the first repeated letter from a string the user enters, it uses the BufferedReader class set to get input from the System.in object wrapped by an InputStreamReader. I'm sure that sounds complicated, but the code explains it better:
import java.io.BufferedReader;
import java.io.Console;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Set;
import java.util.TreeSet;
public class FirstRecurringCharacter {
/**
* #param args the command line arguments
*/
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter your string: ");
String toAnalyze = reader.readLine();
returnFirstRecurring(toAnalyze);
}
private static Character returnFirstRecurring(String toAnalyze) {
String toSearch = toAnalyze;
Set<Character> seenCharacters = new TreeSet<>();
for (int i = 0; i < toSearch.length(); i++) {
if (seenCharacters.contains(toSearch.charAt(i))) {
System.out.println(toSearch.charAt(i));
return toSearch.charAt(i);
} else {
seenCharacters.add(toSearch.charAt(i));
}
}
System.out.println("No repeating characters.");
return null;
}
}
The .readLine() method gets the users input after they hit enter on the console. Try it yourself!
With your program, you might want to prompt them, one at a time, to insert a row index, then a column index, you can cast their input to integers if needed, and then use them in the remainder of the program. I hope this helps!
I am trying to output arrays on a new line through a basic client, server application. However, to accomplish this I have had to use substring to find the # after each word to signal the end of the line. However I want to remove this function and have each section on a new line.
public ClientHandler(Socket socket,Users newUser, int newClientUser)
throws IOException
{
client = socket;
input = new Scanner(client.getInputStream());
output = new PrintWriter(
client.getOutputStream(),true);
user = newUser;
clientUser = newClientUser;
String[] itemName = {user.getItemName(1), user.getItemName(2)};
String[] description = {user.getItemDescription(1), user.getItemDescription(2)};
String[] itemtime = {user.getItemTime(1), user.getItemTime(2)};
output.println(itemName[0] + "#" + itemName[1]
+ "#" + "Welcome To The Auction User:" + clientUser
+ itemName[0] +": "+ description[0] +
"#"+ itemName[1] +": "+description[1]+
"#"+ "Deadline For " + itemName[0] + ": "
+ itemtime[0] + "#" +"Deadline For " +
itemName[1] + ": " + itemtime[1]+"#");
}
private synchronized void getMessage(String response)
{
String message="";
for(int i= count; !response.substring(i, i+1).equals("#"); i++)
{
count = i;
}
}
output.println(itemName[0] + "\n" + itemName[1]
+ "\n" + "Welcome To The Auction User:" + clientUser
+ itemName[0] +": "+ description[0] +
"\n"+ itemName[1] +": "+description[1]+
"\n"+ "Deadline For " + itemName[0] + ": "
+ itemtime[0] + "\n" +"Deadline For " +
itemName[1] + ": " + itemtime[1]+"\n");
Instead of having a "#" signify a new line, you can use "\n". Java will read that from your string as a new line.
Basically, I have code that uses the same few lines in different scenarios, and it makes the code a bit messy (especially since I probably overcomplicated what I made, but that's another issue). What I wanted to do is store that piece of code as another function and calling it in the longer one. WHich should work as far as I know, except, the longer function has variables that aren't set in the shorter one, and if they were, I'm pretty sure it would change the final result of the function.
Here is the longer code:
public static void combat(Character a,Character b){
int battleturn = 1;
int maxTurns=20;
int draw1 = 0;
//stop after 20 turns, or stop when one player has 0 HP.
while (a.health > 0 && b.health > 0 && maxTurns > 0){
/* run a round of combat*/
if (b.health < 0.25 * b.maxHealth){
if (b.getFlee(a)){
System.out.println(">>>>>>>>>>The enemy has fled successfully<<<<<<<<<<");
break;
}else{
System.out.println("Battle turn " + battleturn + ", <attack> or <flee>?");
Scanner input = new
Scanner(System.in);
String move = input.next();
while(!move.equals("attack") && !move.equals("flee")){
System.out.println("Error: Please input <attack> or <flee>.");
input = new Scanner(System.in);
move = input.next();
}
if (move.equals("attack")){
System.out.println(a.name + " dealt " + a.combatRound(b) + " damage to " + b.name + "." + " Enemy has "
+ b.getHealth() + "/" + b.getMaxHealth() + " health.");
System.out.println(b.name + " dealt " + b.combatRound(a) + " damage to " + a.name + "." + " You have " +
a.getHealth() + "/" + a.getMaxHealth() + " health");
maxTurns--;
battleturn++;
}else if(move.equals("flee")){
if (a.getFlee(b)){
draw1++;
System.out.println(">>>>>>>>>>You have fled!<<<<<<<<<<");
break;
}else{
System.out.println(a.name + " dealt " + a.combatRound(b) + " damage to " + b.name + "." + " Enemy has " +
b.getHealth() + "/" + b.getMaxHealth() + " health.");
System.out.println(b.name + " dealt " + b.combatRound(a) + " damage to " + a.name + "." + " You have " +
a.getHealth() + "/" + a.getMaxHealth() + " health");
maxTurns--;
battleturn++;
}
}
}
}else{
System.out.println("Battle turn " + battleturn + ", <attack> or <flee>?");
Scanner input = new
Scanner(System.in);
String move = input.next();
while(!move.equals("attack") && !move.equals("flee")){
System.out.println("Error: Please input <attack> or <flee>.");
input = new Scanner(System.in);
move = input.next();
}
if (move.equals("attack")){
System.out.println(a.name + " dealt " + a.combatRound(b) + " damage to " + b.name+ "." + " Enemy has " +
b.getHealth() + "/" + b.getMaxHealth() + "health.");
System.out.println(b.name + " dealt " + b.combatRound(a) + " damage to " + a.name + "." + " You have " +
a.getHealth() + "/" + a.getMaxHealth() + " health");
maxTurns--;
battleturn++;
}else if(move.equals("flee")){
if (a.getFlee(b)){
draw1++;
System.out.println(">>>>>>>>>>You have fled!<<<<<<<<<<");
break;
}else{
System.out.println(a.name + " dealt " + a.combatRound(b) + " damage to " + b.name+ "." + " Enemy has " +
b.getHealth() + "/" + b.getMaxHealth() + " health.");
System.out.println(b.name + " dealt " + b.combatRound(a) + " damage to " + a.name + "." + " You have " +
a.getHealth() + "/" + a.getMaxHealth() + " health");
maxTurns--;
battleturn++;
}
}
}
}
}
As you can see there is a part of code that is repeated, and that is.
System.out.println("Battle turn " + battleturn + ", <attack> or <flee>?");
Scanner input = new
Scanner(System.in);
String move = input.next();
while(!move.equals("attack") && !move.equals("flee")){
System.out.println("Error: Please input <attack> or <flee>.");
input = new Scanner(System.in);
move = input.next();
}
if (move.equals("attack")){
System.out.println(a.name + " dealt " + a.combatRound(b) + " damage to " + b.name + "." + " Enemy has "
+ b.getHealth() + "/" + b.getMaxHealth() + " health.");
System.out.println(b.name + " dealt " + b.combatRound(a) + " damage to " + a.name + "." + " You have " +
a.getHealth() + "/" + a.getMaxHealth() + " health");
maxTurns--;
battleturn++;
}else if(move.equals("flee")){
if (a.getFlee(b)){
draw1++;
System.out.println(">>>>>>>>>>You have fled!<<<<<<<<<<");
break;
}else{
System.out.println(a.name + " dealt " + a.combatRound(b) + " damage to " + b.name + "." + " Enemy has " +
b.getHealth() + "/" + b.getMaxHealth() + " health.");
System.out.println(b.name + " dealt " + b.combatRound(a) + " damage to " + a.name + "." + " You have " +
a.getHealth() + "/" + a.getMaxHealth() + " health");
maxTurns--;
battleturn++;
}
}
}
It won't compile if I set that chunk of code as a method, because it doesn't have the variables battleturn, maxturns, draw1, but if I put them in there, the amount of battle turns messes up.
Any ideas?
Java applications should be modular: each class fulfilling its own function, each method generally performing a single operation.
In a method you can use either class variables or its own local variables.
If you need several methods work with the same data, it should either be part of a class (instance and/or static variables) or passed to each method as parameters.
Make sure that you do not define class variables in a method. This will create local variables that will shadow class variables.
This might help you accomplish what you're trying to do.
private static void reportDamage(Character a,
Character b) {
System.out.println(a.name + " dealt "
+ a.combatRound(b) + " damage to " + b.name
+ "." + " Enemy has " + b.getHealth() + "/"
+ b.getMaxHealth() + " health.");
}
I suggest changing your combat method like this.
int battleturn = 0;
int maxTurns = 20;
// stop after 20 turns, or stop when one player has 0
// HP.
Scanner input = new Scanner(System.in);
try {
while (a.health > 0 && b.health > 0
&& battleturn < maxturn) {
battleturn++;
/* run a round of combat */
if (b.getFlee(a)) {
System.out.println(">>>>>>>>>>"
+ "The enemy has fled successfully"
+ "<<<<<<<<<<");
break;
} else {
System.out.println("Battle turn "
+ battleturn + ", <attack> or <flee>?");
boolean isFlee = false;
boolean isAttack = false;
String move = input.next();
for (;;) {
isAttack = "attack".equalsIgnoreCase(move);
isFlee = "flee".equalsIgnoreCase(move);
if (isFlee || isAttack) {
break;
}
System.out.println("Error: "
+ "Please input <attack> or <flee>.");
move = input.next();
}
if (isAttack) {
reportDamage(a, b);
reportDamage(b, a);
} else { // isFlee
if (a.getFlee(b)) {
System.out.println(">>>>>>>>>>"
+ "You have fled successfully"
+ "<<<<<<<<<<");
break;
} else {
// b is fleeing.
// reportDamage(a, b);
reportDamage(b, a);
}
}
}
}
} finally {
input.close();
}