Java simulates PHP's pack and unpack classes, packunpack_PHP tutorial

java simulates PHP's pack and unpack classes, packunpack

The example in this article shares with you the specific code for java to simulate PHP's pack and unpack classes for your reference. The specific content is as follows

package qghl.intp.util;
 
import java.io.IOException;
import java.io.InputStream;
 
public class PackUtil{
 
    /**
     * 打包字符串
     * 类似php中pack在java中的实现
     *
     * @param str
     * @return
     */
    public static byte[] pack(String str) {
      int nibbleshift = 4;
      int position = 0;
      int len = str.length() / 2 + str.length() % 2;
      byte[] output = new byte[len];
      for (char v : str.toCharArray()) {
        byte n = (byte) v;
        if (n >= '0' && n <= '9') {
          n -= '0';
        } else if (n >= 'A' && n <= 'F') {
          n -= ('A' - 10);
        } else if (n >= 'a' && n <= 'f') {
          n -= ('a' - 10);
        } else {
          continue;
        }
        output[position] |= (n << nibbleshift);
 
        if (nibbleshift == 0) {
          position++;
        }
        nibbleshift = (nibbleshift + 4) & 7;
      }
 
      return output;
    }
 
    /**
     * 16进制的字符解压 类php中unpack
     *
     * @param is
     * @param len
     * @return
     * @throws IOException
     */
    public static String unpack(InputStream is, int len) throws IOException {
      byte[] bytes = new byte[len];
      is.read(bytes);
      return unpack(bytes);
    }
 
    /***
     * 16进制的字符解压 类php中unpack
     * @param bytes
     * @return
     */
    public static String unpack(byte[] bytes) {
      StringBuilder stringBuilder = new StringBuilder("");
      if (bytes == null || bytes.length <= 0) {
        return null;
      }
      for (int i = 0; i < bytes.length; i++) {
        int v = bytes[i] & 0xFF;
        String hv = Integer.toHexString(v);
        if (hv.length() < 2) {
          stringBuilder.append(0);
        }
        stringBuilder.append(hv);
      }
      return stringBuilder.toString();
    }
  }

The above is the entire content of this article. I hope it will be helpful to everyone in learning java programming.

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http://www.bkjia.com/PHPjc/1119958.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/1119958.htmlTechArticlejava simulates PHP’s pack and unpack classes, packunpack This example shares with you java’s simulation of PHP’s pack and unpack classes The specific code is for your reference. The specific content is as follows package qghl.intp...