JAVA读取TXT文件

 1 package com.test.demo;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.File;
 5 import java.io.FileInputStream;
 6 import java.io.InputStreamReader;
 7 
 8 public class demo_one {
 9     /**
10      * 读取txt文件的内容
11      * @param file 想要读取的文件对象
12      * @return 返回文件内容
13      */
14     public static String txt2String(File file){
15         StringBuilder result = new StringBuilder();
16         try{
17             InputStreamReader isr = new InputStreamReader(new FileInputStream(file), "GBK");
18             BufferedReader br = new BufferedReader(isr);
19          //   BufferedReader br = new BufferedReader(new FileReader(file));//构造一个BufferedReader类来读取文件
20             String s = null;
21             while((s = br.readLine())!=null){//使用readLine方法，一次读一行
22                 result.append(System.lineSeparator()+s);
23             }
24             br.close();    
25         }catch(Exception e){
26             e.printStackTrace();
27         }
28         return result.toString();
29     }
30     
31     public static void main(String[] args){
32         File file = new File("D:/bankcode.txt");
33         System.out.println(txt2String(file));
34     }
35 }