Java：PrintStream 到字符串？
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Java: PrintStream to String?
提问by Nick Heiner
I have a function that takes an object of a certain type, and a PrintStreamto which to print, and outputs a representation of that object. How can I capture this function's output in a String? Specifically, I want to use it as in a toStringmethod.
我有一个函数，它接受某种类型的对象和一个PrintStream要打印的对象，并输出该对象的表示。如何在字符串中捕获此函数的输出？具体来说，我想在toString方法中使用它。
采纳答案by ChssPly76
Use a ByteArrayOutputStreamas a buffer:
使用 aByteArrayOutputStream作为缓冲区：
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.nio.charset.StandardCharsets;
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final String utf8 = StandardCharsets.UTF_8.name();
try (PrintStream ps = new PrintStream(baos, true, utf8)) {
yourFunction(object, ps);
}
String data = baos.toString(utf8);
回答by Asaph
You can construct a PrintStream with a ByteArrayOutputStream passed into the constructor which you can later use to grab the text written to the PrintStream.
您可以使用传递给构造函数的 ByteArrayOutputStream 构造 PrintStream，稍后您可以使用它来获取写入 PrintStream 的文本。
ByteArrayOutputStream os = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(os);
...
String output = os.toString("UTF8");
回答by Kamil Szot
Maybe this question might help you: Get an OutputStream into a String
也许这个问题可能对你有帮助： Get an OutputStream into a String
Subclass OutputStream and wrap it in PrintStream
子类 OutputStream 并将其包装在 PrintStream 中
回答by user7805633
Define and initialize a Scanner variable named inSS that creates an input string stream using the String variable myStrLine.
定义并初始化名为 inSS 的 Scanner 变量，该变量使用 String 变量 myStrLine 创建输入字符串流。
Ans: Scanner inSS = new Scanner(myStrLine);
Ans: Scanner inSS = new Scanner(myStrLine);
回答by Kaelan Dawnstar
A unification of previous answers, this answer works with Java 1.7 and after. Also, I added code to close the Streams.
先前答案的统一，此答案适用于 Java 1.7 及更高版本。此外，我添加了代码来关闭流。
final Charset charset = StandardCharsets.UTF_8;
ByteArrayOutputStream baos = new ByteArrayOutputStream();
PrintStream ps = new PrintStream(baos, true, charset.name());
yourFunction(object, ps);
String content = new String(baos.toByteArray(), charset);
ps.close();
baos.close();
