Java中使用BufferedReader的readLine()方法和read()方法来读取文件内容

 

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BufferedReader
12 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arr1
31             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