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

 package com;
 import java.io.*;
 import java.util.ArrayList;
 import java.util.List;

 import javax.print.DocFlavor.CHAR_ARRAY;

 import com.google.common.primitives.Chars;
 /*
 1、首先创建FileReader对象
 2、将FileReader传递给BufferedReader
 3、采用BufferedReader的readLine()方法和read()方法来读取文件内容
 4、最后一定要的finally语句中关闭BufferedReader  */
 public class MathYsf3{
     public static void main(String[] args){
         BufferedReader br = null;
         BufferedReader br2 = null;
     try {
         br = new BufferedReader(new FileReader("C:\\Users\\91911\\Desktop\\test.txt"));
         // 第一种读取文件方式
         System.out.println("Reading the file using readLine() method: ");
         String contentLine ;
         List<String> arr1 = new ArrayList<>();
         while ((contentLine = br.readLine()) != null) {
 //            contentLine = br.readLine();
             //读取每一行，并输出
             System.out.println(contentLine);
             //将每一行追加到arr1
             arr1.add(contentLine);
             }
         //输出数组
         System.out.println(arr1);
         // 第二种读取文件方式
         br2 = new BufferedReader(new FileReader("C:\\Users\\91911\\Desktop\\test.txt"));
         System.out.println("Reading the file using read() method: ");
         int num = 0;
         char ch;
         while ((num = br2.read()) != -1) {
             ch = (char) num;
             System.out.print(ch);
             }
         } catch (FileNotFoundException e) {
             e.printStackTrace();
             } catch (IOException e) {
                 e.printStackTrace();
                 } finally {
                     try {
                         if (br != null) {
                             br.close();
                             }
                         if (br2 != null) {
                             br2.close();
                             }
                         } catch (IOException e) {
                             System.out.println("Error in closing the BufferedReader");
                             }
             }
         }
     }

结果输出：

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