java 从 InputStream 读取文本
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Read text from InputStream
提问by jthg
If I start with a java.io.InputStream, what's the easiest way to read the entire stream out into a String (assuming utf-8)?
如果我从 java.io.InputStream 开始，将整个流读入字符串（假设为 utf-8）的最简单方法是什么？
This should be pretty easy but I'm mostly a C# person and google is failing me on this. Thanks.
这应该很容易，但我主要是一个 C# 人，谷歌在这方面让我失望。谢谢。
采纳答案by zznate
回答by erickson
Dospecify the character encoding. Do notwaste code, introduce bugs, and slow execution with a BufferedReader.
请指定字符编码。不要浪费代码、引入错误和使用BufferedReader.
Here is an example. You could parameterize it with a buffer size, encoding, etc.
这是一个例子。您可以使用缓冲区大小、编码等对其进行参数化。
static String readString(InputStream is) throws IOException {
char[] buf = new char[2048];
Reader r = new InputStreamReader(is, "UTF-8");
StringBuilder s = new StringBuilder();
while (true) {
int n = r.read(buf);
if (n < 0)
break;
s.append(buf, 0, n);
}
return s.toString();
}
回答by Peter Lawrey
Using Commons-IO is likely to be the best option. For your interest, another approach is to copy all the bytes and then convert it into a String.
使用 Commons-IO 可能是最好的选择。为了您的兴趣，另一种方法是复制所有字节，然后将其转换为字符串。
public static String readText(InputStream is, String charset) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] bytes = new byte[4096];
for(int len;(len = is.read(bytes))>0;)
baos.write(bytes, 0, len);
return new String(baos.toByteArray(), charset);
}
回答by thug-gamer
I've found a nice way in Java 8 with streams:
我在 Java 8 中找到了一种使用流的好方法：
public static String readString(InputStream is) {
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String content = br.lines().reduce("", String::concat);
return content;
}
As stated above you can swap new InputStreamReader(is) with new InputStreamReader(is, "UTF-8"), but I have no experience with this constructor.
如上所述，您可以将 new InputStreamReader(is) 与 new InputStreamReader(is, "UTF-8") 交换，但我对这个构造函数没有经验。
回答by Dónal
Reading/writing from streams is remarkably painful in Java.
在 Java 中从流中读取/写入非常痛苦。
public static String getStreamContents(InputStream stream) throws IOException {
StringBuilder content = new StringBuilder()
Reader reader = new BufferedReader(new InputStreamReader(stream, "UTF-8"))
String lineSeparator = System.getProperty("line.separator");
try {
String line
while ((line = reader.readLine()) != null) {
content.append(line + lineSeparator)
}
return content.toString()
} finally {
reader.close()
}
}
