package inputstream.cn;import java.io.File;import java.io.FileInputStream;import java.io.InputStream;/* * 第五种读取方式:文件读到末尾了,会返回-1 * 得到len的值,还给b数组赋值 * int temp; int len = 0; while ((temp = is.read())!=-1) { b[len] = (byte)temp; len++; } * */public class InputStreamDemo5 { public static void main(String[] args) throws Exception { //使用file 找到一个文件 File f = new File("d:"+File.separator+"test.txt"); //通过子类实例化父类 InputStream is =new FileInputStream(f); //开辟一个1024的字节数组,把所有的类容读到此数组中 byte[] b = new byte[1024]; int temp; int len = 0; while ((temp = is.read())!=-1) { b[len] = (byte)temp; len++; } //关闭输入流 is.close(); //打印读的数据,将byte类型转换为string类型输出 System.out.println(new String(b,0,len)); }}