java读取文本文件内容并获取文件大小：
import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileReader; import java.io.IOException; public class FileContent { private String path = "F:\\下载说明.txt"; public FileContent() throws IOException { File f = new File(path); FileReader fileReader = new FileReader(f); BufferedReader br = new BufferedReader(fileReader); String str; while((str = br.readLine() ) != null) { System.out.println(str); } System.out.println(new FileInputStream(new File(path)).available() / 1024 / 1024 +"M"); } public static void main(String[] args) { try { new FileContent(); } catch (IOException e) { e.printStackTrace(); } } }