使用流api获取字符串

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

public class StreamExample {
    public static void main(String[] args) {
        try {
            // 创建输入流对象
            InputStream inputStream = new FileInputStream("example.txt");
            
            // 创建缓冲区
            byte[] buffer = new byte[1024];
            
            // 读取数据并存储到缓冲区
            int bytesRead;
            StringBuilder stringBuilder = new StringBuilder();
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                stringBuilder.append(new String(buffer, 0, bytesRead));
            }
            
            // 将缓冲区中的数据转换为字符串
            String content = stringBuilder.toString();
            
            // 输出字符串
            System.out.println(content);
            
            // 关闭输入流
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}