NIO 中文乱码自我解决的简单DEMO

Posted 2020-11-02 jpfss

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.channels.FileChannel;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;

import org.apache.commons.lang.time.DurationFormatUtils;


public class NIOTest {
    
    public static final int SIZE = 102400;
    public static final String PATH = "D:\\\\test\\\\test.txt";
    
    public static void main(String args[]) {
        
        //方法一测试通过
        /*
         try {//写数据
            FileChannel fileOutChannel = new FileOutputStream(PATH,true).getChannel();
            fileOutChannel.write(ByteBuffer.wrap("这是用FileOutpuStream调用NIO的Channel写出的内容".getBytes()));
            System.out.println("写出成功！");
            fileOutChannel.close();
            //读数据
            FileChannel fileInChannel = new FileInputStream(PATH).getChannel();
            ByteBuffer byteBuffer = ByteBuffer.allocate(SIZE);
            fileInChannel.read(byteBuffer);
            byteBuffer.flip();
            Charset charset = Charset.forName("UTF-8");
            while (byteBuffer.hasRemaining()) {
                CharsetDecoder charsetDecoder = charset.newDecoder();
                CharBuffer charBuffer = charsetDecoder.decode(byteBuffer);
                System.out.print(charBuffer);                   
            }
            System.out.println();
            System.out.println("读入完成！");
            fileInChannel.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        */
        
        //方法二未经测试
        try {
            FileChannel fileChannel = new RandomAccessFile(PATH, "rw").getChannel();
            //写数据
            fileChannel.write(ByteBuffer.wrap("这是用RandomAccessFile调用NIO的Channel写出的内容".getBytes()));
            System.out.println("写出成功！");
            //读数据
            ByteBuffer byteBuffer = ByteBuffer.allocate(SIZE);
            fileChannel.read(byteBuffer);
            byteBuffer.flip();
            Charset charset = Charset.forName("UTF-8");
            while (byteBuffer.hasRemaining()) {
                CharsetDecoder charsetDecoder = charset.newDecoder();
                CharBuffer charBuffer = charsetDecoder.decode(byteBuffer);
                System.out.print(charBuffer);               
            }
            System.out.println();
            System.out.println("读入成功！");
            fileChannel.close();
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO: handle exception
        }
        
    }
    
    
    

}

查看方法一运行效果：