如何将StringReader转换为String？ [英] How do I convert a StringReader to a String?

问题描述

我正在尝试将 StringReader 转换回常规字符串，如下所示：

I'm trying to convert my StringReader back to a regular String, as shown:

String string = reader.toString();

但是当我尝试读出这个字符串时，就像这样：

But when I try to read this string out, like this:

System.out.println("string: "+string);

我得到的只是一个指针值，如下所示：

All I get is a pointer value, like this:

java.io.StringReader@2c552c55

我在读回字符串时做错了吗？

Am I doing something wrong in reading the string back?

推荐答案

StringReader 的 toString 方法不返回 StringReader 内部缓冲区。

The StringReader's toString method does not return the StringReader internal buffers.

你需要阅读 StringReader 才能得到这个。

You'll need to read from the StringReader to get this.

我建议使用接受字符数组的read重载。批量读取比单个字符读取更快。

I recommend using the overload of read which accepts a character array. Bulk reads are faster than single character reads.

ie。

//use string builder to avoid unnecessary string creation.
StringBuilder builder = new StringBuilder();
int charsRead = -1;
char[] chars = new char[100];
do{
    charsRead = reader.read(chars,0,chars.length);
    //if we have valid chars, append them to end of string.
    if(charsRead>0)
        builder.append(chars,0,charsRead);
}while(charsRead>0);
String stringReadFromReader = builder.toString();
System.out.println("String read = "+stringReadFromReader);

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