字符串编码的例子

import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.Arrays;
public class Test {
    public static void main(String[] args) throws UnsupportedEncodingException {
        char x = '编';  // char 占用两个字节 也就是16bit.
        // 获取JVM 默认字符集
        System.out.println(Charset.defaultCharset());  //UTF-8
        System.out.println(System.getProperty("file.encoding"));//UTF-8
        String str = "编";
        System.out.println("##字符串转换成byte数组");
        byte[] defaultByteArray = str.getBytes();
        byte[] gbkByteArray = str.getBytes("GBK");
        byte[] utfByteArray = str.getBytes("UTF-8");
        System.out.println("defaultByteArray:" + Arrays.toString(defaultByteArray)); //defaultByteArray:[-25, -68, -106]
        System.out.println("gbkByteArray:" + Arrays.toString(gbkByteArray)); //gbkByteArray:[-79, -32]
        System.out.println("utfByteArray:" + Arrays.toString(utfByteArray)); //utfByteArray:[-25, -68, -106]
        System.out.println("##byte数组转换成字符串");
        String defaultStr = new String(defaultByteArray); // utf-8 到 utf-8 没有问题
        String gbkStr = new String(defaultByteArray, "GBK"); // utf-8 到 gbk  即： [-25, -68, -106] 到 [-79, -32]
        String utfStr = new String(defaultByteArray, "UTF-8"); // utf-8 到 utf-8 没有问题
        System.out.println("defaultStr:" + defaultStr); // defaultStr:编
        System.out.println("gbkStr:" + gbkStr); // gbkStr:缂�    这里乱码的原因是gbk是两个字节表示
        System.out.println("utfStr:" + utfStr);  // utfStr:编
        byte[] bytes = {-25, -68};
        System.out.println(new String(bytes, "GBK") );  // 缂
    }
}