import java.io.UnsupportedEncodingException;
import java.util.Random;

/**
 * @Description
 * 参考  https://blog.csdn.net/glizhewen/article/details/124869501
 */
public class ChineseCharactersUtils {
    public static void main(String[] args) {
        ChineseCharactersUtils t = new ChineseCharactersUtils();
        t.test();
        t.test2();
        String randomChar = t.randomChar(500);
        System.out.println(randomChar);
    }
    public void test(){
        String str = "";
        int highPos;
        int lowPos;
        Random random = new Random();

        highPos = (176 + Math.abs(random.nextInt(39)));
        lowPos = (161 + Math.abs(random.nextInt(93)));

        byte[] b = new byte[2];
        b[0] = (Integer.valueOf(highPos)).byteValue();
        b[1] = (Integer.valueOf(lowPos)).byteValue();

        try {
            str = new String(b, "GBK");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        char result = str.charAt(0);
        System.out.println("result : " + result);
    }
    public void test2(){
        char result = (char) (0x4e00 + (int) (Math.random() * (0x9fa5 - 0x4e00 + 1)));
        System.out.println("result : " + result);
    }

    public String randomCharAt(Integer len){
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < len; i++) {
            char result = (char) (0x4e00 + (int) (Math.random() * (0x9fa5 - 0x4e00 + 1)));
            sb.append(result);
        }
        return sb.toString();
    }
    public String randomChar(Integer len){
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i < len; i++) {
            int highPos;
            int lowPos;
            Random random = new Random();

            highPos = (176 + Math.abs(random.nextInt(39)));
            lowPos = (161 + Math.abs(random.nextInt(93)));

            byte[] b = new byte[2];
            b[0] = (Integer.valueOf(highPos)).byteValue();
            b[1] = (Integer.valueOf(lowPos)).byteValue();

            try {
                sb.append(new String(b, "GBK"));
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
}