Java中byte[]、String、Hex字符串等转换的方法

代码如下所示：

/*输入一个byte和byte[]合并为byte[]*/ 
public byte[] bytemerger(byte byte_1, byte[] byte_2) { 
 byte[] byte_3 = new byte[1 + byte_2.length]; 
 byte_3[0] = byte_1; 
 system.arraycopy(byte_2, 0, byte_3, 1, byte_2.length); 
 return byte_3; 
 } 
/*输入一个byte[]和byte[]合并为byte[]*/ 
public byte[] bytemerger(byte[] byte_1, byte[] byte_2) { 
 byte[] byte_3 = new byte[1 + byte_2.length]; 
 byte_3[0] = byte_1; 
 system.arraycopy(byte_2, 0, byte_3, byte_1.length, byte_2.length); 
 return byte_3; 
 } 
/*输入一个string（16进制的字符hex eg：ff）输出为16进制的byte[]，注意输入为小写的hex字符串*/ 
public byte[] hexstringtobyte(string hex) { 
 int len = (hex.length() / 2); 
 byte[] result = new byte[len]; 
 char[] achar = hex.tochararray(); 
 for (int i = 0; i < len; i++) { 
  int pos = i * 2; 
  result[i] = (byte) (chartobyte(achar[pos]) << 4 | chartobyte(achar[pos + 1])); 
 } 
 //system.out.println(arrays.tostring(result)); 
 return result; 
 } 
 private byte chartobyte(char c) { 
 //return (byte) "0123456789abcdef".indexof(c); 
 return (byte) "0123456789abcdef".indexof(c); 
 } 
/*输入10进制数字字符串，输出hex字符串（2位,eg: f 则输出 0f）*/ 
string value= "100"; 
int parseint = integer.parseint(value, 10); 
string hexstring = integer.tohexstring(parseint); 
  if (hexstring.length() < 2) { 
  hexstring = '0' + hexstring; 
  } 
  header = header + hexstring; 
 } 
/*输入16进制byte[]输出16进制字符串*/ 
 public static string bytearraytohexstr(byte[] bytearray) { 
 if (bytearray == null) { 
  return null; 
 } 
 char[] hexarray = "0123456789abcdef".tochararray(); 
 char[] hexchars = new char[bytearray.length * 2]; 
 for (int j = 0; j < bytearray.length; j++) { 
  int v = bytearray[j] & 0xff; 
  hexchars[j * 2] = hexarray[v >>> 4]; 
  hexchars[j * 2 + 1] = hexarray[v & 0x0f]; 
 } 
 return new string(hexchars); 
 } 

ps：下面看下js对url中特殊字符的转换

let str = "http%3a%2f%2fxxxxxxxx%2findex.php%2fxxxxxxx%2fmember%2fregister%3frecommend_id%3d11442%26id%3d87"; 
function replacestr(str){ 
 str = str.replace(/%3a/g, ":"); 
 str = str.replace(/%2f/g, "/"); 
 str = str.replace(/%3f/g, "?"); 
 str = str.replace(/%3d/g, "="); 
 str = str.replace(/%26/g, "&"); 
 str = str.replace(/%2b/g, "+"); 
 str = str.replace(/%20/g, " "); 
 str = str.replace(/%23/g, "#"); 
 return str; 
} 
console.log(replacestr(str)); 

总结

以上所述是小编给大家介绍的java中byte[]、string、hex字符串等转换的方法，希望对大家有所帮助