From 8f31c94ed8c72e5aa93a0d154e10dd72d84a13a5 Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Sat, 21 Mar 2026 13:19:28 +0800
Subject: [PATCH] =?UTF-8?q?=E8=BF=9B=E9=98=B6day09-=E7=94=A8=E5=AD=97?=
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---
 .../src/com/inmind/inputstream02/Demo07.java  | 53 +++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 javaSE-day09/src/com/inmind/inputstream02/Demo07.java

diff --git a/javaSE-day09/src/com/inmind/inputstream02/Demo07.java b/javaSE-day09/src/com/inmind/inputstream02/Demo07.java
new file mode 100644
index 0000000..a20d8d7
--- /dev/null
+++ b/javaSE-day09/src/com/inmind/inputstream02/Demo07.java
@@ -0,0 +1,53 @@
+package com.inmind.inputstream02;
+
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+
+/*
+用字节输入流一次读取一个字节数组
+FileInputStream(String name) 通过打开与实际文件的连接来创建一个 FileInputStream ，该文件由文件系统中的路径名 name命名。
+      int read(byte[] b) 从字节输入流中将字节数据读取到参数b数组中，返回的值读取的字节个数
+ */
+public class Demo07 {
+    public static void main(String[] args) throws IOException {
+        FileInputStream fis = new FileInputStream("a.txt");
+
+
+        /*byte[] bytes = new byte[2];//用来保存字节输入流读取的多个字节数据（暂且是2个）
+        int len ; //用来保存读取到字节数据的个数
+        len = fis.read(bytes);
+        System.out.println(len);
+        System.out.println(new String(bytes,0,len));
+
+        len = fis.read(bytes);
+        System.out.println(len);
+        System.out.println(new String(bytes,0,len));
+
+        len = fis.read(bytes);
+        System.out.println(len);
+        System.out.println(new String(bytes,0,len));
+
+        len = fis.read(bytes);
+        System.out.println(len);*/
+
+        //int read(byte[] b)  一次读一个字节数组
+        byte[] bytes = new byte[1024];//用来保存读取字节数据的数组
+        int len;//保存读取到字节的个数（判断读几个字节，是否是末尾）
+        /*
+        循环条件：
+        (len = fis.read(bytes))!=-1
+            1.fis.read(bytes):将字节输入流中的字节数据读取到bytes数组中
+            2.len = fis.read(bytes):将读取到的字节数据的长度赋值给len
+            3.(len = fis.read(bytes))!=-1:判断read的返回值是否是-1,就是在判断是否有更多的数据
+
+         */
+        while ((len = fis.read(bytes)) != -1) {
+            System.out.println(len);
+            System.out.println(new String(bytes,0,len));//读取多少个字节，就获取多少个
+        }
+
+        fis.close();
+        System.out.println("程序结束");
+    }
+}