outputstream转byte数组、

inputstream转byte数组、byte数组转inputstream、multipartfile转byte数组、byte数组转multipartfile以及string转byte数组的方法。

将outputstream转为byte数组的方法是将outputstream对象转为bytearrayoutputstream对象，然后调用toByteArray()方法即可获得byte数组。例如：

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
// 向outputStream写入数据
byte[] byteArray = outputStream.toByteArray();

将inputstream转为byte数组的方法是创建一个ByteArrayOutputStream对象，然后使用BufferedInputStream从inputstream中读取数据，并通过write方法写入bytearrayoutputstream对象中，最后调用toByteArray()方法即可获得byte数组。例如：

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
InputStream inputStream = new FileInputStream(file);
BufferedInputStream bufferedInputStream = new BufferedInputStream(inputStream);
byte[] buffer = new byte<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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