Java NIO之字符集Charset代码实例

相关Java NIO详解： Java NIO详解

代码实例

import org.junit.Test;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.util.Map;
import java.util.Set;

/**
 * 字符集（Charset）
 * 编码：字符串-->字节数组
 * 解码：字节数组-->字符串
 */

public class CharsetDemo {

    @Test
    public void charSetEncoderAndDecoder() throws CharacterCodingException {
        Charset charset=Charset.forName("UTF-8");
        //1.获取编码器
        CharsetEncoder charsetEncoder=charset.newEncoder();
        //2.获取解码器
        CharsetDecoder charsetDecoder=charset.newDecoder();

        //3.获取需要解码编码的数据
        CharBuffer charBuffer=CharBuffer.allocate(1024);
        charBuffer.put("字符集编码解码");
        charBuffer.flip();

        //4.编码
        ByteBuffer byteBuffer=charsetEncoder.encode(charBuffer);
        System.out.println("编码后：");
        for (int i=0;i<byteBuffer.limit();i++) {
            System.out.println(byteBuffer.get());
        }
        //5.解码
        byteBuffer.flip();
        CharBuffer charBuffer1=charsetDecoder.decode(byteBuffer);
        System.out.println("解码后：");
        System.out.println(charBuffer1.toString());
        System.out.println("指定其他格式解码:");
        Charset charset1=Charset.forName("GBK");
        byteBuffer.flip();
        CharBuffer charBuffer2 =charset1.decode(byteBuffer);
        System.out.println(charBuffer2.toString());
        //6.获取Charset所支持的字符编码
         Map<String ,Charset> map= Charset.availableCharsets();
         Set<Map.Entry<String,Charset>>  set=map.entrySet();
        for (Map.Entry<String,Charset> entry: set
             ) {
            System.out.println(entry.getKey()+"="+entry.getValue().toString());
        }
    }



}