# 如何在 Java 中将`InputStream`转换为字符串 > 原文： [https://beginnersbook.com/2013/12/how-to-convert-inputstream-to-string-in-java/](https://beginnersbook.com/2013/12/how-to-convert-inputstream-to-string-in-java/) 以下是如何读取`InputStream`并将其转换为`String`的完整示例。涉及的步骤是： 1）我使用[`getBytes()`方法](https://beginnersbook.com/2013/12/java-string-getbytes-method-example/) 将文件内容转换为字节之后，使用包含内部缓冲区的`ByteArrayInputStream`初始化`InputStream`，缓冲区包含可以从流中读取的字节。 2）使用`InputStreamReader`读取`InputStream` 。 3）使用`BufferedReader`读取`InputStreamReader`。 4）将`BufferedReader`读取的每一行附加到`StringBuilder`对象上。 5）最后使用`toString()`方法将`StringBuilder`转换为`String`。 ```java import java.io.BufferedReader; import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; public class Example { public static void main(String[] args) throws IOException { InputStreamReader isr = null; BufferedReader br = null; InputStream is = new ByteArrayInputStream("This is the content of my file".getBytes()); StringBuilder sb = new StringBuilder(); String content; try { isr = new InputStreamReader(is); br = new BufferedReader(isr); while ((content = br.readLine()) != null) { sb.append(content); } } catch (IOException ioe) { System.out.println("IO Exception occurred"); ioe.printStackTrace(); } finally { isr.close(); br.close(); } String mystring = sb.toString(); System.out.println(mystring); } } ``` 输出： ```java This is the content of my file ``` #### 参考： * [`BufferedReader`](https://docs.oracle.com/javase/7/docs/api/java/io/BufferedReader.html) * [`ByteArrayInputStream`](https://docs.oracle.com/javase/7/docs/api/java/io/ByteArrayInputStream.html) * [`InputStream`](https://docs.oracle.com/javase/7/docs/api/java/io/InputStream.html) * [`InputStreamReader`](https://docs.oracle.com/javase/7/docs/api/java/io/InputStreamReader.html)