字符串转换hex编码（一般手机发短信都会用到String转换为hex）

import java.io.ByteArrayOutputStream;

public class test {
 private static String hexString = "0123456789ABCDEFabcdef";
 //private static String hexString = "0123456789abcdefABCDEF";
 /**
  * @param args
  */
 public static void main(String[] args) {
  String msg= "亲，你好";
  byte[] bytes = msg.getBytes();
  StringBuilder sb = new StringBuilder(bytes.length * 2);
  //转换hex编码
  for (byte b : bytes) {
   sb.append(Integer.toHexString(b + 0x800).substring(1));
  }

//转换后的代码为c7d7a3acc4e3bac3
  msg = sb.toString();
  System.out.println(msg);

 //再次转换为string
  System.out.println(decode(msg));
  //System.out.println(msg);
 }

 

//把hex编码转换为string

 public static String decode(String bytes) {
  bytes = bytes.toUpperCase();
  ByteArrayOutputStream baos = new ByteArrayOutputStream(bytes.length() / 2);
  // 将每2位16进制整数组装成一个字节
  for (int i = 0; i < bytes.length(); i += 2)
   baos.write((hexString.indexOf(bytes.charAt(i)) << 4 | hexString.indexOf(bytes.charAt(i + 1))));
  return new String(baos.toByteArray());
 }
}