如何在Java中将InputStream读取/转换为String? [英] How do I read / convert an InputStream into a String in Java?

问题描述

如果有一个java.io.InputStream对象，应该如何处理该对象并产生一个String?

If you have a java.io.InputStream object, how should you process that object and produce a String?

假设我有一个包含文本数据的InputStream，并且我想将其转换为String，例如，我可以将其写入日志文件.

Suppose I have an InputStream that contains text data, and I want to convert it to a String, so for example I can write that to a log file.

获取InputStream并将其转换为String的最简单方法是什么?

What is the easiest way to take the InputStream and convert it to a String?

public String convertStreamToString(InputStream is) {
    // ???
}

推荐答案

一个很好的方法是使用 Apache commons IOUtils将InputStream复制到StringWriter ...类似

A nice way to do this is using Apache commons IOUtils to copy the InputStream into a StringWriter... something like

StringWriter writer = new StringWriter();
IOUtils.copy(inputStream, writer, encoding);
String theString = writer.toString();

甚至

// NB: does not close inputStream, you'll have to use try-with-resources for that
String theString = IOUtils.toString(inputStream, encoding); 

或者，如果您不想混合使用Streams和Writers，则可以使用ByteArrayOutputStream

Alternatively, you could use ByteArrayOutputStream if you don't want to mix your Streams and Writers

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