java读取文本文件

Seamanm 2021-09-07 原文

下面的代码是读取文本文件的例子，程序会读取text.txt文件，并将它的内容显示出来。


 1 import java.io.BufferedReader;
 2  import java.io.File;
 3  import java.io.FileReader;
 4  import java.io.FileNotFoundException;
 5  import java.io.IOException;
 6  
 7 public class ReadTextFileExample
 8 {
 9     public static void main(String[] args)
10     {
11         File file = new File("test.txt");
12         StringBuffer contents = new StringBuffer();
13         BufferedReader reader = null;
14  
15         try
16         {
17             reader = new BufferedReader(new FileReader(file));
18             String text = null;
19  
20             // repeat until all lines is read
21             while ((text = reader.readLine()) != null)
22             {
23                 contents.append(text)
24                     .append(System.getProperty(
25                         "line.separator"));
26             }
27         } catch (FileNotFoundException e)
28         {
29             e.printStackTrace();
30         } catch (IOException e)
31         {
32             e.printStackTrace();
33         } finally
34         {
35             try
36             {
37                 if (reader != null)
38                 {
39                     reader.close();
40                 }
41             } catch (IOException e)
42             {
43                 e.printStackTrace();
44             }
45         }
46          
47         // show file contents here
48         System.out.println(contents.toString());
49     }
50 }