Java 将 ByteArrayInputStream 的内容转换为字符串
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/24059266/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Convert Contents Of A ByteArrayInputStream To String
提问by Mushy
I read this postbut I am not following. I have seen thisbut have not seen a proper example of converting a ByteArrayInputStreamto Stringusing a ByteArrayOutputStream.
我读了这篇文章，但我没有关注。我已经看到了这一点，但还没有看到将 a 转换ByteArrayInputStream为String使用 a的正确示例ByteArrayOutputStream。
To retrieve the contents of a ByteArrayInputStreamas a String, is using a ByteArrayOutputstreamrecommended or is there a more preferable way?
要将 a 的内容检索ByteArrayInputStream为 a String，是使用ByteArrayOutputstream推荐的还是有更可取的方法？
I was considering this exampleand extend ByteArrayInputStreamand utilize a Decoratorto increase functionality at run time. Any interest in this being a better solution to employing a ByteArrayOutputStream?
我正在考虑这个例子并扩展ByteArrayInputStream和利用装饰器来增加运行时的功能。对这是使用 的更好解决方案有兴趣ByteArrayOutputStream吗？
采纳答案by Joop Eggen
A ByteArrayOutputStreamcan read from any InputStreamand at the end yield a byte[].
AByteArrayOutputStream可以从任何读取，InputStream最后产生 a byte[]。
However with a ByteArrayInputStreamit is simpler:
然而，ByteArrayInputStream它更简单：
int n = in.available();
byte[] bytes = new byte[n];
in.read(bytes, 0, n);
String s = new String(bytes, StandardCharsets.UTF_8); // Or any encoding.
For a ByteArrayInputStreamavailable()yields the total number of bytes.
对于 aByteArrayInputStreamavailable()产生总字节数。
Answer to comment: using ByteArrayOutputStream
回答评论：使用 ByteArrayOutputStream
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buf = new byte[8192];
for (;;) {
int nread = in.read(buf, 0, buf.length);
if (nread <= 0) {
break;
}
baos.write(buf, 0, nread);
}
in.close();
baos.close();
byte[] bytes = baos.toByteArray();
Here in may be any InputStream.
这里可以是任何 InputStream。
回答by Mifmif
Use Scannerand pass to it's constructor the ByteArrayInputStreamthen read the data from your Scanner , check this example :
使用Scanner并传递给它的构造函数，ByteArrayInputStream然后从你的 Scanner 读取数据，检查这个例子：
ByteArrayInputStream arrayInputStream = new ByteArrayInputStream(new byte[] { 65, 80 });
Scanner scanner = new Scanner(arrayInputStream);
scanner.useDelimiter("\Z");//To read all scanner content in one String
String data = "";
if (scanner.hasNext())
data = scanner.next();
System.out.println(data);
回答by Bowser Jr.
Use Base64 encoding
使用 Base64 编码
Assuming you got your ByteArrayOutputStream :
假设你有你的 ByteArrayOutputStream ：
ByteArrayOutputStream baos =...
String s = new String(Base64.Encoder.encode(baos.toByteArray()));
See http://docs.oracle.com/javase/8/docs/api/java/util/Base64.Encoder.html
请参阅http://docs.oracle.com/javase/8/docs/api/java/util/Base64.Encoder.html
回答by Cherry
Why nobody mentioned org.apache.commons.io.IOUtils?
为什么没人提org.apache.commons.io.IOUtils？
import java.nio.charset.StandardCharsets;
import org.apache.commons.io.IOUtils;
String result = IOUtils.toString(in, StandardCharsets.UTF_8);
Just one line of code.
只需一行代码。
回答by ZhekaKozlov
Java 9+ solution:
Java 9+ 解决方案：
new String(inputStream.readAllBytes(), StandardCharsets.UTF_8);
