英文:
How do I get the file size of a given string?
问题
如果我们有一个字符串，并且我们将该字符串放入一个文本文件中... 那个文本文件将会有一个大小。是否有某种公式，我们可以用来计算这个大小？我真的需要这样做，因为将字符串转换为文本文件，获取大小，然后删除文件并不起作用。
英文:
If we had a string and we put that string into a text file... that text file would have a size. Is there some sort of formula that we could use to calculate the size? I really need to do this because turning the string into a text file and getting the size then deleting the file is not working.
答案1
得分: 3
使用java.nio.Files的示例：
public static long getStringSize(String str) throws IOException {
Path file = Path.of("niofiles.txt");
Files.writeString(file, str, StandardOpenOption.CREATE_NEW);
long size = Files.size(file);
Files.deleteIfExists(file); // cleanup
return size;
}
使用java.io.File的示例：
public static long getStringSizeFile(String str) throws IOException {
File file = new File("iofile.txt");
try (BufferedWriter bw = new BufferedWriter(new FileWriter(file))) {
bw.write(str);
}
long size = file.length();
file.delete(); // cleanup
return size;
}
更简单的示例，使用字节数组的长度：
public static int stringSize(String str) {
return str.getBytes().length;
}
英文:
Example using java.nio.Files:
public static long getStringSize(String str) throws IOException {
Path file = Path.of("niofiles.txt");
Files.writeString(file, str, StandardOpenOption.CREATE_NEW);
long size = Files.size(file);
Files.deleteIfExists(file); // cleanup
return size;
}
Example using java.io.File:
public static long getStringSizeFile(String str) throws IOException {
File file = new File("iofile.txt");
try (BufferedWriter bw = new BufferedWriter(new FileWriter(file))) {
bw.write(str);
}
long size = file.length();
file.delete(); // cleanup
return size;
}
Even simpler example to use length of the byte array:
public static int stringSize(String str) {
return str.getBytes().length;
}
答案2
得分: 0
以下是翻译好的内容：
你只需要计算存储字符串所需的“字节”数量，因为一个字符可能会占用多个字节。
当你写入 n 个字节到文件时，该文件将恰好有这么多字节。请使用 String.getBytes() 来计算它。
public static void main(String... args) {
String str = "endereço";
System.out.println(str.length()); // 8
System.out.println(str.getBytes(StandardCharsets.UTF_8)); // 9
}
英文:
All you need is to count bytes required to store you string, because one character could take more than one byte.
When you write n bytes to the file, this file is going to have exactly this amount of bytes. Do use String.getBytes() to calculate it.
public static void main(String... args) {
String str = "endereço";
System.out.println(str.length()); // 8
System.out.println(str.getBytes(StandardCharsets.UTF_8)); // 9
}
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