如何用Java的BufferedReader与InputStreamReader读取文件？

问题描述：

下面我有下面的代码来读取一个文件，并逐行通过它..这是使用java的BufferedReader类。我很好。如何用Java的BufferedReader与InputStreamReader读取文件？

String filename = "C:\\test.txt" 
String line = null; 

FileReader fileReader = new FileReader(filename); 
BufferedReader bufferedReader = new BufferedReader(fileReader); 

try { 
    while (((line = bufferedReader.readLine()) != null)) { 

    //do the following.... 

    } 

} catch (IOException) { 
    e.printStackTrace(); 
    }

但是我想现在开始在Spring/Java中使用InputStreamReader。我写了下面的代码，但我不确定如何逐行扫描我的文件。真的很困惑这部分。任何人有任何想法或知道如何做到这一点？

String filepath= "C:\\test.txt" 
File filename= new File(filepath); 

try { 
    InputStream fileInputStream = new BOMInputStream(new fileInputStream(filename)); 

// now want to step through the file, line by line.. 

} catch (IOException) { 
    e.printStackTrace(); 
    }

感谢

任何理由不只是使用'新的InputStreamReader（的FileInputStream）'？ – chrylis

[Convert InputStream to BufferedReader]的可能重复（http://stackoverflow.com/questions/5200187/convert-inputstream-to-bufferedreader） – Neil

备注：考虑使用NIO.2 File API。 – Puce

答

这是如何通过使用字节读取InputStreamReader的输入文件字节。

char[] chars = new char[100]; 
    try { 
     InputStream inputStream  = new FileInputStream("C:\\test.txt"); 
     InputStreamReader inputStreamReader = new InputStreamReader(inputStream,"UTF-8");   
     inputStreamReader.read(chars);   
     System.out.println(new String(chars).trim()); 
    } catch (IOException e) { 
     e.printStackTrace(); 
    }

答

检查了这一点 -

String filename = "C:\\test.txt" 
String line = null; 

FileInputStream fileInputStream = new FileInputStream(filename); 
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(fileInputStream)); 

try { 
    while (((line = bufferedReader.readLine()) != null)) { 

    //do the following.... 

    } 

} catch (IOException) { 
    e.printStackTrace(); 
}

答

public static void main(String[] args) { 
    try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream("c:\\test.txt")))) { 

     reader.lines().forEach(line -> { 
      // do what you want with the line 
     }); 

    } catch (IOException e) { 
     throw new RuntimeException(e); 
    } 

}

如何用Java的BufferedReader与InputStreamReader读取文件？

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