Java FileInputStream 问题(额外空格)

Question

当我使用 FileInputStream 从 spawn.txt 文件输入基于图 block 的 map 的文本时，它会在每行之间添加额外的空格。

package mapInit;

import java.io.FileInputStream;

public class SpawnMap {

    static char[][] spawnWorld = new char[30][30];

    public static void main(String[] args) {
        try {
            FileInputStream spawn = new FileInputStream("Resources/Map/spawn.txt");
            int i = 0;
            int h = 0;
            int k = 0;
            while((i=spawn.read())!=-1){
                if(h == 30) {
                    h = 0;
                    k++;
                }
                spawnWorld[k][h] = (char)i;
                h++;
            }       
            spawn.close();
        } catch (Exception e) {
        }
        for (int i=0; i<30; i++) { 
            for (int j=0;j<30;j++) { 
                System.out.println(spawnWorld[i][j]); 
            } 
        }
    }

}

这是输出循环的结果: 这是文本文件的图片:

GitHub 链接:https://github.com/WeaponGod243/Machlandia

Answer 1

我认为 Scanner 类更适合您的任务

Scanner class in Java is found in the java.util package. Java provides various ways to read input from the keyboard, the java.util.Scanner class is one of them.

The Java Scanner class breaks the input into tokens using a delimiter which is whitespace by default. It provides many methods to read and parse various primitive values.

The Java Scanner class is widely used to parse text for strings and primitive types using a regular expression. It is the simplest way to get input in Java. By the help of Scanner in Java, we can get input from the user in primitive types such as int, long, double, byte, float, short, etc.

The Java Scanner class extends Object class and implements Iterator and Closeable interfaces.

The Java Scanner class provides nextXXX() methods to return the type of value such as nextInt(), nextByte(), nextShort(), next(), nextLine(), nextDouble(), nextFloat(), nextBoolean(), etc. To get a single character from the scanner, you can call next().charAt(0) method which returns a single character. Source

Scanner Java Doc

public static void main(String arg[]) {

    try (Scanner sc = new Scanner(new File("Resources/Map/spawn.txt"))) {
        // Checking if sc has another token in the file
        while(sc.hasNext()) {
            // Print line
            System.out.println(sc.next());
        }

    } catch (Exception ex) {
        // Use a Logger to log exceptions in real projects
        ex.printStackTrace();
    }
}

您也可以使用 Apache Commons IO 库

      <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.5</version>
      </dependency>


    import org.apache.commons.io.FileUtils;
    import java.io.File;
    import java.io.IOException;
    import java.util.List;

    public class ReadTextFile {

        public static void main(String[] args) throws IOException {

            try {       
                File f = new File("Resources/Map/spawn.txt");

                List<String> lines = FileUtils.readLines(f, "UTF-8");

                for (String line : lines) {
                    System.out.println(line);
                }

            } catch (IOException e) {
                // Use a Logger to log exceptions in real projects
                e.printStackTrace();
            }

        }        
    }