Java 字节流与字符流（字符输入流：Reader）

import java.io.File;
import java.io.FileReader;
import java.io.Reader;

public class Demo {
public static void main(String[] args) throws Exception {
File file = new File("e:" + File.separator + "Demo" + File.separator + "TEST.txt");
if (file.exists()) {
Reader in = new FileReader(file);
char[] data = new char[1024];
int len = in.read(data);
in.close();
System.out.println(new String(data, 0, len));
}
}
}