Java编程的IO操作

package com.ietree.io;

import java.io.FileInputStream;

public class IODemos {
    public static void main(String[] args) throws Exception {
        FileInputStream fis = new FileInputStream(\"D:\\\\test.txt\");
        // 方法一：读取单个字节，每次调用将后移一位，返回读取到的字节，如果读到文件末尾返回-1；
        // 缺点是每读一次循环一次，效率比较低    
        int data;
        while((data = fis.read()) != -1) {
            System.out.println((char)data);
        }
        fis.close();        
    }
}

package com.ietree.io;

import java.io.FileInputStream;

public class IODemos {
    public static void main(String[] args) throws Exception {
        FileInputStream fis = new FileInputStream(\"D:\\\\test.txt\");
// 方法二：批量读取多个字节到字节数组，返回读取到的字节个数，如果读到文件末尾，返回-1
        byte[] buf = new byte[5];
        int len;
        while((len = fis.read(buf)) != -1) {
            System.out.print(new String(buf, 0, len));
        }
        fis.close();       
    }
}