I/O FileInputStream 字节类型文件输入输出流（汉字显示乱码）-优快云博客

本文介绍了使用Java进行文件读写的两种方式：一种是通过FileInputStream读取文本文件并将其内容转换为字符串输出；另一种是将一个图片文件复制到另一个位置。

package IOliu;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;

public class FileInputStreamTest {

    public static void main(String[] args) {
        //FileInputStream 字节类型的输入流
        FileInputStream fis = null;
        try {
            fis = new FileInputStream("D:\\2016.txt");
            int i = 0 ;
            //StringBuffer拼接文件内容
            StringBuffer sb = new StringBuffer();
            //输入流结尾默认为-1
            while((i = fis.read())!= -1){
                char ch = (char) i;
                sb.append(ch);
            }    //读取一个字节
            System.out.println(sb.toString());
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally{
            //fis.close()异常:空指针异常
            try {
                fis.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        
    }

}

输出流

package IOliu;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

public class FileInputStreamTest {

    public static void main(String[] args) {
        //FileInputStream 字节类型的输入流
        FileInputStream fis = null;
        FileOutputStream fos = null;
        try {
            fis = new FileInputStream("E:\\小霸王游戏机-珍藏84合1 模拟器+84款经典游戏\\1.gif");
            fos = new FileOutputStream("E:\\dogcopy.gif");
            //StringBuffer拼接文件内容
            //StringBuffer sb;
            int i = 0;
            //定义比特数组，用来拼接汉字，解决字节乱码问题
            //byte[] bArray;
            //bArray = new byte[1024];
            //sb = new StringBuffer();
            //输入流结尾默认为-1
            while((i = fis.read())!= -1){
                fos.write(i);
                //char ch = (char) i;
                //sb.append(bArray);
            }    //读取一个字节
            //System.out.println(sb.toString());
            //System.out.println(new String(bArray));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally{
            //fis.close()异常:空指针异常
            try {
                fis.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        
    }

}