InputStream中3个read方法的区别

 

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：

 

*****************？*****************

 

转载于:https://www.cnblogs.com/beibidewomen/p/7357778.html

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