目标：读文件

编程时，有很多时候需要读取本地文件，下面介绍一下读取方式：

读单行文件

 

1 package com; 2 import java.io.*; 3 import java.util.ArrayList; 4 import java.util.List; 5  6 import javax.print.DocFlavor.CHAR_ARRAY; 7  8 import com.google.common.primitives.Chars; 9 /*10 1、首先创建FileReader对象11 2、将FileReader传递给BufferedReader12 3、采用BufferedReader的readLine()方法和read()方法来读取文件内容13 4、最后一定要的finally语句中关闭BufferedReader15  */16 public class MathYsf3{17     public static void main(String[] args){18         BufferedReader br = null;19         BufferedReader br2 = null;20     try {21         br = new BufferedReader(new FileReader("C:\\Users\\91911\\Desktop\\test.txt"));22         // 第一种读取文件方式23         System.out.println("Reading the file using readLine() method: ");24         String contentLine ;25         List
     
       arr1 = new ArrayList<>();26         while ((contentLine = br.readLine()) != null) {27 //            contentLine = br.readLine();28             //读取每一行，并输出29             System.out.println(contentLine);30             //将每一行追加到arr131             arr1.add(contentLine);32             }33         //输出数组34         System.out.println(arr1);35         // 第二种读取文件方式36         br2 = new BufferedReader(new FileReader("C:\\Users\\91911\\Desktop\\test.txt"));37         System.out.println("Reading the file using read() method: ");38         int num = 0;39         char ch;40         while ((num = br2.read()) != -1) {41             ch = (char) num;42             System.out.print(ch);43             }44         } catch (FileNotFoundException e) { 45             e.printStackTrace();46             } catch (IOException e) {47                 e.printStackTrace();48                 } finally {49                     try {50                         if (br != null) {51                             br.close();52                             }53                         if (br2 != null) {54                             br2.close();55                             }56                         } catch (IOException e) {57                             System.out.println("Error in closing the BufferedReader");58                             }59             }  60         }    61     }
     

结果输出：

from：https://blog.csdn.net/huludan/article/details/54095751