我们可以使用Java的BufferedReader类读取文件中的字符。请参阅下面的示例-
在类路径中请看以下文本文件。
test.txt
This is Line 1 This is Line 2 This is Line 3 This is Line 4 This is Line 5 This is Line 6 This is Line 7 This is Line 8 This is Line 9 This is Line 10
测试器
import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException; import java.io.InputStreamReader; public class Tester { private static final String FILE_PATH = "data.txt"; public static void main(String args[]) throws IOException { FileUtil fileUtil = new FileUtil(FILE_PATH); System.out.println("No. of characters in file: " + fileUtil.getCharCount()); } } class FileUtil { static BufferedReader reader = null; public FileUtil(String filePath) throws FileNotFoundException { File file = new File(filePath); FileInputStream fileStream = new FileInputStream(file); InputStreamReader input = new InputStreamReader(fileStream); reader = new BufferedReader(input); } public static int getCharCount() throws IOException { int charCount = 0; String data; while((data = reader.readLine()) != null) { charCount += data.length(); } return charCount; } }
这将产生以下结果-
输出结果
No. of characters in file: 141