java.lang.Object
- org.springframework.util.StreamUtils

```
public abstract class StreamUtils
extends Object
```
Simple utility methods for dealing with streams. The copy methods of this class are similar to those defined in FileCopyUtils except that all affected streams are left open when done. All copy methods use a block size of 4096 bytes.
Mainly for use within the framework, but also useful for application code.
从以下版本开始:
3.2.2
作者:
Juergen Hoeller, Phillip Webb, Brian Clozel
另请参阅:
FileCopyUtils

字段概要
字段
修饰符和类型字段说明
static int BUFFER_SIZE
The default buffer size used when copying bytes.

构造器概要
构造器
构造器说明
StreamUtils()

方法概要

所有方法静态方法具体方法
修饰符和类型	方法	说明
`static void`	`copy(byte[] in, OutputStream out)`	Copy the contents of the given byte array to the given OutputStream.
`static int`	`copy(InputStream in, OutputStream out)`	Copy the contents of the given InputStream to the given OutputStream.
`static void`	`copy(String in, Charset charset, OutputStream out)`	Copy the contents of the given String to the given OutputStream.
`static long`	`copyRange(InputStream in, OutputStream out, long start, long end)`	Copy a range of content of the given InputStream to the given OutputStream.
`static byte[]`	`copyToByteArray(InputStream in)`	Copy the contents of the given InputStream into a new byte array.
`static String`	`copyToString(ByteArrayOutputStream baos, Charset charset)`	Copy the contents of the given `ByteArrayOutputStream` into a `String`.
`static String`	`copyToString(InputStream in, Charset charset)`	Copy the contents of the given InputStream into a String.
`static int`	`drain(InputStream in)`	Drain the remaining content of the given InputStream.
`static InputStream`	`emptyInput()`	Return an efficient empty `InputStream`.
`static InputStream`	`nonClosing(InputStream in)`	Return a variant of the given `InputStream` where calling `close()` has no effect.
`static OutputStream`	`nonClosing(OutputStream out)`	Return a variant of the given `OutputStream` where calling `close()` has no effect.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - BUFFER_SIZE
```
public static final int BUFFER_SIZE
```
    The default buffer size used when copying bytes.
    另请参阅:
    常量字段值
- 构造器详细资料
  - StreamUtils
```
public StreamUtils()
```
- 方法详细资料
  - copyToByteArray
```
public static byte[] copyToByteArray(@Nullable
                                     InputStream in)
                              throws IOException
```
    Copy the contents of the given InputStream into a new byte array.
    Leaves the stream open when done.
    参数:
    in - the stream to copy from (may be null or empty)
    返回:
    the new byte array that has been copied to (possibly empty)
    抛出:
    IOException - in case of I/O errors
  - copyToString
```
public static String copyToString(@Nullable
                                  InputStream in,
                                  Charset charset)
                           throws IOException
```
    Copy the contents of the given InputStream into a String.
    Leaves the stream open when done.
    参数:
    in - the InputStream to copy from (may be null or empty)
    charset - the Charset to use to decode the bytes
    返回:
    the String that has been copied to (possibly empty)
    抛出:
    IOException - in case of I/O errors
  - copyToString
```
public static String copyToString(ByteArrayOutputStream baos,
                                  Charset charset)
```
    Copy the contents of the given ByteArrayOutputStream into a String.
    This is a more effective equivalent of new String(baos.toByteArray(), charset).
    参数:
    baos - the ByteArrayOutputStream to be copied into a String
    charset - the Charset to use to decode the bytes
    返回:
    the String that has been copied to (possibly empty)
    从以下版本开始:
    5.2.6
  - copy
```
public static void copy(byte[] in,
                        OutputStream out)
                 throws IOException
```
    Copy the contents of the given byte array to the given OutputStream.
    Leaves the stream open when done.
    参数:
    in - the byte array to copy from
    out - the OutputStream to copy to
    抛出:
    IOException - in case of I/O errors
  - copy
```
public static void copy(String in,
                        Charset charset,
                        OutputStream out)
                 throws IOException
```
    Copy the contents of the given String to the given OutputStream.
    Leaves the stream open when done.
    参数:
    in - the String to copy from
    charset - the Charset
    out - the OutputStream to copy to
    抛出:
    IOException - in case of I/O errors
  - copy
```
public static int copy(InputStream in,
                       OutputStream out)
                throws IOException
```
    Copy the contents of the given InputStream to the given OutputStream.
    Leaves both streams open when done.
    参数:
    in - the InputStream to copy from
    out - the OutputStream to copy to
    返回:
    the number of bytes copied
    抛出:
    IOException - in case of I/O errors
  - copyRange
```
public static long copyRange(InputStream in,
                             OutputStream out,
                             long start,
                             long end)
                      throws IOException
```
    Copy a range of content of the given InputStream to the given OutputStream.
    If the specified range exceeds the length of the InputStream, this copies up to the end of the stream and returns the actual number of copied bytes.
    Leaves both streams open when done.
    参数:
    in - the InputStream to copy from
    out - the OutputStream to copy to
    start - the position to start copying from
    end - the position to end copying
    返回:
    the number of bytes copied
    抛出:
    IOException - in case of I/O errors
    从以下版本开始:
    4.3
  - drain
```
public static int drain(InputStream in)
                 throws IOException
```
    Drain the remaining content of the given InputStream.
    Leaves the InputStream open when done.
    参数:
    in - the InputStream to drain
    返回:
    the number of bytes read
    抛出:
    IOException - in case of I/O errors
    从以下版本开始:
    4.3
  - emptyInput
```
public static InputStream emptyInput()
```
    Return an efficient empty InputStream.
    返回:
    a ByteArrayInputStream based on an empty byte array
    从以下版本开始:
    4.2.2
  - nonClosing
```
public static InputStream nonClosing(InputStream in)
```
    Return a variant of the given InputStream where calling close() has no effect.
    参数:
    in - the InputStream to decorate
    返回:
    a version of the InputStream that ignores calls to close
  - nonClosing
```
public static OutputStream nonClosing(OutputStream out)
```
    Return a variant of the given OutputStream where calling close() has no effect.
    参数:
    out - the OutputStream to decorate
    返回:
    a version of the OutputStream that ignores calls to close

类 StreamUtils

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

BUFFER_SIZE

构造器详细资料

StreamUtils

方法详细资料

copyToByteArray

copyToString

copyToString

copy

copy

copy

copyRange

drain

emptyInput

nonClosing

nonClosing