I am writing a small java method that needs to read test data from a file on my win10 laptop.
The test data has not been formed yet but it will be text based.
I need to write a method that reads the data and analyses it character by character.
My questions are:
what is the simplest format to create and read the file....I was looking at JSON, something that does not look particularly complex but is it the best for a very simple application?
My second question (and I am a novice). If the file is in a text file on my laptop.....how do I tell my java code where to find it....how do I ask java to navigate the win10 operating system?
As for the format the text file needs to take, you should elaborate a bit on the kind of data. So I can't say much there.
But to navigate the file system, you just need to write the path a bit different:
then you should be set.
So for example...
C:\users\johndoe\documents\projectfiles\mydatafile.txt
becomes
c/users/johndoe/documents/projectfiles/mydatafile.txt
With this path, you can use all the IO classes for file manipulation.
Regarding your first question, I can't say much, without knowing anything about the data you like to write/read.
For your second question, you would normally do something like this:
String pathToFile = "C:/Users/SomeUser/Documents/testdata.txt";
InputStream in = new FileInputStream(pathToFile);
As your data gains more complexity you should probably think about using a defined format, if that is possible, something like JSON, YAML or similar for example.
Hope this helps a bit. Good luck with your project.
You can also map the text file into java objects (It depends on your text file).
For example, we have a text file that contains person name and family line by line like:
Foo,bar
John,doe
So for parse above text file and map it into a java object we can :
1- Create a Person Object
2- Read and parse the file (line by line)
public class Person {
private String name;
private String family;
//setters and getters
}
public static void main(String[] args) throws IOException {
//Read file
//Parse line by line
//Map into person object
List<Person> personList = Files
.lines(Paths
.get("D:\\Project\\Code\\src\\main\\resources\\person.txt"))
.map(line -> {
//Get lines of test and split by ","
//It split words of the line and push them into an array of string. Like "John,Doe" -> [John,Doe]
List<String> nameAndFamily = Splitter.on(",").trimResults().omitEmptyStrings().splitToList(line);
//Create a new Person and get above words
Person person = new Person();
person.setName(nameAndFamily.get(0));
person.setFamily(nameAndFamily.get(1));
return person;
}
).collect(Collectors.toList());
//Process the person list
personList.forEach(person -> {
//You can whatever you want to the each person
//Print
System.out.println(person.getName());
System.out.println(person.getFamily());
});
}
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