如何在Java中读取/转换InputStream为String？ [英] How to read / convert an InputStream into a String in Java?

问题描述

如果您有 java.io.InputStream 对象，您应该如何处理该对象并生成 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 ，我想将它转换为 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 ？

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

推荐答案

这是一个很好的方法正在使用 Apache commons IOUtils 复制 InputStream 进入 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，你可以使用 ByteArrayOutputStream 如果你不想混合你的Streams和Writers

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

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