3个read方法的区别
read()读取1个字节
read(byte[] b)将文本中的所有数据读取到b这个字节数组中
read(byte[] b, int off, int len)从流的第off个字节开始，读入长度为len的字节的数据
*****************read（）*****************
package com.xuzhiwen.io1; import java.io.File; import java.io.FileInputStream; public class InputStreamTest { public static void main(String[] args) throws Exception { String s = File.separator; File file = new File("E:"+s+"filetest"+s+"11.txt"); FileInputStream in = new FileInputStream(file); int i; while((i=in.read()) != -1){ System.out.println((char)i); } } }
11.TXT文件内容：
运行程序输出结果为：
*****************read(byte[] b)*****************
返回值为：实际读取的字节数
package com.xuzhiwen.io1; import java.io.File; import java.io.FileInputStream; public class InputStreamTest { public static void main(String[] args) throws Exception { String s = File.separator; File file = new File("E:"+s+"filetest"+s+"11.txt"); FileInputStream in = new FileInputStream(file); int len; byte b[] = new byte[1024]; while((len = in.read(b)) != -1){ System.out.println(new String(b)); } } }
运行结果如下：
*****************？*****************
