主要代码：
import java.io.File;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;public class Application {public static void main(String[] args) throws IOException {String content = "";StringBuilder builder = new StringBuilder();File file = new File("E:\\hello.txt");InputStreamReader streamReader = new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8);BufferedReader bufferedReader = new BufferedReader(streamReader);while ((content = bufferedReader.readLine()) != null) builder.append(content);System.out.println(builder.toString());}
}
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