如何将字符串从文本文件复制到Java字符串？

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class CopyStringFromFile {
    public static void main(String[] args) {
        String filePath = "path/to/text/file.txt"; // 替换为实际的文件路径

        try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
            StringBuilder stringBuilder = new StringBuilder();
            String line;

            while ((line = reader.readLine()) != null) {
                stringBuilder.append(line);
                stringBuilder.append(System.lineSeparator()); // 如果需要保留换行符，可以添加该行代码
            }

            String fileContent = stringBuilder.toString();
            System.out.println("从文本文件复制到Java字符串成功！");
            System.out.println("文件内容：");
            System.out.println(fileContent);
        } catch (IOException e) {
            System.out.println("读取文本文件失败：" + e.getMessage());
        }
    }
}