outputstreamreader
时间: 2023-04-25 17:00:34 浏览: 55
OutputStreamReader是Java中的一个类,它是一个字符流,用于将字节流转换为字符流。它可以将字节流转换为指定的字符编码格式,例如UTF-8、GBK等。它通常用于读取网络数据或文件数据,并将其转换为字符流进行处理。
相关问题
outputstreamREADER
The InputStreamReader class is a class in the Java API that is used to adapt an InputStream object to a Reader object. This class reads characters from an InputStream object and converts them into Unicode characters.
The constructors of the InputStreamReader class take as input an InputStream object and an optional character encoding type. The default character encoding type is based on the platform's default encoding, but can be specified by passing in an encoding type as a string to the constructor.
An InputStreamReader object can be used wherever a Reader object is needed, such as when reading text data from a file or network connection. The InputStreamReader class provides a convenient way to read text data from sources that return bytes of data, such as network sockets or input streams.
Example code:
```
InputStream inputStream = new FileInputStream("myFile.txt");
InputStreamReader inputStreamReader = new InputStreamReader(inputStream, StandardCharsets.UTF_8);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
String line;
while ((line = bufferedReader.readLine()) != null) {
System.out.println(line);
}
bufferedReader.close();
```
In this example, an InputStream object is created from a file named "myFile.txt". An InputStreamReader object is then created by passing in the input stream object and specifying the character encoding type as UTF-8. Finally, a BufferedReader object is created from the InputStreamReader object, and used to read each line of text from the input file.
outputstream 逐行读取
Outputstream 是用于写入数据的,而不是读取数据。如果你想逐行读取数据,应该使用 InputStream。以下是一个使用 BufferedReader 逐行读取 InputStream 的例子:
```java
InputStream inputStream = new FileInputStream("file.txt");
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
// 处理每一行数据
}
reader.close();
```
在这个例子中,我们打开一个名为 "file.txt" 的文件作为输入流,使用 InputStreamReader 将字节流转换为字符流,然后构造一个 BufferedReader 对象来逐行读取数据。在 while 循环中,我们读取每一行数据并进行处理,直到读取到了文件末尾。最后,我们关闭 BufferedReader 对象以及底层的 InputStream。
相关推荐
![application/x-zip](https://img-home.csdnimg.cn/images/20210720083736.png)
![](https://img-home.csdnimg.cn/images/20210720083646.png)
![rar](https://img-home.csdnimg.cn/images/20210720083606.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://csdnimg.cn/download_wenku/file_type_ask_c1.png)
![](https://img-home.csdnimg.cn/images/20210720083646.png)