InputStream与InputStreamReader(InputStream vs InputStreamReader)

 在InputStreamReader上使用InputStream有什么好处，反之亦然。 
 
 以下是InputStream一个示例： 
 
InputStream input = new FileInputStream("c:\\data\\input-text.txt");

int data = input.read();
while(data != -1) {
  //do something with data...
  doSomethingWithData(data);

  data = input.read();
}
input.close();
 
 这里是一个使用InputStreamReader的例子（显然在InputStream的帮助下）： 
 
InputStream inputStream = new FileInputStream("c:\\data\\input.txt");
Reader      reader      = new InputStreamReader(inputStream);

int data = reader.read();
while(data != -1){
    char theChar = (char) data;
    data = reader.read();
}

reader.close();  
 
 读者是否以特殊的方式处理数据？ 
 
 只是试图让我的头脑围绕Java中的整个i/o流数据方面。 

What's the benefit of using InputStream over InputStreamReader, or vice versa.
 
Here is an example of InputStream in action:
 
InputStream input = new FileInputStream("c:\\data\\input-text.txt");

int data = input.read();
while(data != -1) {
  //do something with data...
  doSomethingWithData(data);

  data = input.read();
}
input.close();
 
And here is an example of using InputStreamReader (obviously with the help of InputStream):
 
InputStream inputStream = new FileInputStream("c:\\data\\input.txt");
Reader      reader      = new InputStreamReader(inputStream);

int data = reader.read();
while(data != -1){
    char theChar = (char) data;
    data = reader.read();
}

reader.close();  
 
Does the Reader process the data in a special way?
 
Just trying to get my head around the whole i/o streaming data aspect in Java.

原文：https://stackoverflow.com/questions/3194918