Java 如何将 Writer 转换为 String
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How to convert Writer to String
提问by Pandian
Writer writer = new Writer();
String data = writer.toString();/* the value is not casting and displaying null...*/
Is there any other way to convert a writer to string?
有没有其他方法可以将作家转换为字符串？
采纳答案by Grzegorz ?ur
I would use a specialized writer if I wanted to make a String out of it.
如果我想用它制作一个字符串，我会使用一个专门的作家。
Writer writer = new StringWriter();
String data = writer.toString(); // now it works fine
回答by CommonsWare
If you want a Writerimplementation that results in a String, use a StringWriter.
如果您想要一个Writer导致a 的实现String，请使用 aStringWriter。
回答by Alex Shesterov
Several answers suggest using StringWriter.
It's important to realize that StringWriteruses StringBufferinternally, meaning that it's thread-safeand has a significant synchronization overhead.
几个答案建议使用StringWriter. 重要的是要意识到在内部StringWriter使用StringBuffer，这意味着它是线程安全的并且具有显着的同步开销。
If you need thread-safety for the writer, then
StringWriteris the way to go.If you don't need a thread safe
Writer(i.e. the writer is only used as a local variable in a single method) and you care for performance — consider usingStringBuilderWriterfrom the commons-io library.
如果您需要作家的线程安全，那么
StringWriter就是要走的路。如果您不需要线程安全
Writer（即编写器仅用作单个方法中的局部变量）并且您关心性能 -考虑使用StringBuilderWriter来自commons-io 库。
StringBuilderWriteris almost the same as StringWriter, but uses StringBuilderinstead of StringBuffer.
StringBuilderWriter与 几乎相同StringWriter，但使用StringBuilder代替StringBuffer。
Sample usage:
示例用法：
Writer writer = new StringBuilderWriter();
String data = writer.toString();
Note — Log4j has its own StringBuilderWriter implementationwhich is almost identical to the commons-io version.
注意——Log4j 有自己的 StringBuilderWriter 实现，它几乎与 commons-io 版本相同。
