缓冲流，转换流

使用字节缓冲流和数组来复制一个东西

import java.io.*;

public class test1 {
    public static void main(String[] args) throws Exception {

        long start = System.currentTimeMillis();
        String path1 = "/Users/mima000000/Desktop/1.jpeg";
        String path2 = "/Users/mima000000/Desktop/2.jpeg";
        BufferedInputStream bufferedInputStream = new BufferedInputStream(new FileInputStream(path1));
        BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(new FileOutputStream(path2));
        int len;
        byte[] bytes = new byte[1024];
        while ((len=bufferedInputStream.read(bytes))!=-1){
            bufferedOutputStream.write(bytes,0,len);
        }
        bufferedOutputStream.close();
        bufferedInputStream.close();

    }
}

转换流

InputStreamReader指定GBK来读取

import com.sun.xml.internal.fastinfoset.util.ValueArrayResourceException;
import sun.nio.cs.ext.GBK;

import java.io.*;

public class test1 {
    public static void main(String[] args) throws Exception {
        String path = "/Users/mima000000/Desktop/1.txt";
        InputStreamReader inputStreamReader = new InputStreamReader(new FileInputStream(path), "GBK");
        int read;
        while ((read=inputStreamReader.read())!=-1){
            System.out.println((char)read);
        }
        inputStreamReader.close();

    }
}

转换文件的编码，读取一个gbk 文件，保存为utf-8

import com.sun.xml.internal.fastinfoset.util.ValueArrayResourceException;
import sun.nio.cs.ext.GBK;

import java.io.*;

public class test1 {
    public static void main(String[] args) throws Exception {
        String path = "/Users/mima000000/Desktop/1.txt";
        String path2 = "/Users/mima000000/Desktop/2.txt";
        InputStreamReader inputStreamReader = new InputStreamReader(new FileInputStream(path), "GBK");
        OutputStreamWriter outputStreamWriter = new OutputStreamWriter(new FileOutputStream(path2) ,"UTF-8");
        int len;
        char[] temp = new char[1024];
        while ((len=inputStreamReader.read(temp))!=-1){
            outputStreamWriter.write(temp,0,len);
        }
        outputStreamWriter.close();
        inputStreamReader.close();

    }
}