如何从字符串中删除结尾字符

Question

I have a file which contains a data structure. The data is stored as bytes. I want to display a data (name of person) to screen. Size of the name is about 12 characters long. But data may be less than or equal to 12 characters. I converted the byte array to string and display data. when tried to display data using system.out.println method, it shows data plus unwanted characters. How to show only wanted data.

i tried with below code

// here Name is a byte array
title = new String( Name );
System.out.println("Title = " + title);

output i received is

    Title = area1����������

i want only 'area1'. please provide a solution to resolve it

Answer 1

    String title = new String( Name ,"UTF-8" );
    System.out.println("Title = " + title);

Answer 2

System.out.println("Title = area1����������".replaceAll("([^A-Za-z0-9 ])", ""));

give : Title area1 , you can also add .replaceAll("\\ \\ "," ")); or tune the regex as you like

Answer 3

你有没有尝试过？

String decoded = new String(Name, "UTF-8"); 

Answer 4

from How to determine whether a character is a letter in Java?

string.matches("\\p{L}"); // Unicode letter
string.matches("\\p{Lu}"); // Unicode upper-case letter

You can also do this with Character class:

Character.isLetter(character);

but that is less convenient if you need to check more than one letter.

Answer 5

Using the StringBuilder class, build up the string by appending each character that is read from input file stream, until the end of file is reached. Once end of file is reached, then immediately return back the string via the toString() method of the StringBuilder class.

StringBuilder sb = new StringBuilder();
FileInputStream fis = new FileInputStream(file);
InputStreamReader isr = new InputStreamReader(fis, "UTF-8");//
int c = 0;
while ((c = isr.read()) != -1) {
    sb.append((char) c);
}
String fixedString = sb.toString();

Answer 6

find the updated code here:

        // here Name is a byte array
    String title = new String( "area1����������");
    System.out.println("Title = " + title);

    StringBuilder sb = new StringBuilder(title);
    StringBuilder sb2 = new StringBuilder();
    for(int i=0;i<sb.length();i++)
    {
        if(Character.isLetterOrDigit(sb.charAt(i)))
        {
            sb2.append(sb.charAt(i));
        }
    }

    title = sb2.toString();
    System.out.println("Title = " + title);