把文件里的数据(文本文件)读成字符串

代码如下：

//这个是用Scanner读文件，但是会有异常

import java.io.*;
import java.util.*;

public class Test {
    public static void main(String[] args) throws Exception {
        File file = new File("Test.java");
        Scanner scanner = new Scanner(file);
        String line = null;
       
        while (scanner.hasNextLine()) {
            line = scanner.nextLine();
            System.out.println(line);
        }
        scanner.close();
    }
}
 

//这个是用reader的，这个不会出现异常

import java.io.*;
import java.util.*;

public class Test {
    public static void main(String[] args) throws Exception {
        File file = new File("Test.java");
        BufferedReader reader = new BufferedReader(new FileReader(file));
        String line = null;
       
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
        }
        reader.close();
    }
}