笔记75 | Java字节、十进制、十六进制、字符串之间的相互转换

项勇

发布于 2018-06-19 16:31:56

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发布于 2018-06-19 16:31:56

文章被收录于专栏：项勇

/*
* 字节转10进制
*/
public static int byte2Int(byte b){
int r = (int)b;
return r;
}
/*
* 10进制转字节
*/
public static byte int2Byte(int i){
byte r = (byte)i;
return r;
}
/*
* 字节数组转16进制字符串
*/
public static String bytes2HexString(byte[] b){
String r = " ";
for (int i = 0; i < b.length; i++) {
String hex = Integer.toHexString(b[i] & 0xFF);
if (hex.length() == 1) {
hex = "0"+hex;
}
r += hex.toUpperCase();
}
return r;
}
/*
* 10进制字符串转字节数组
*/
//字符转为字节
private static byte charToByte(char c){
return (byte)"0123456789ABCDEF".indexOf(c);
}
//16进制字符串转字节数组
public static byte[] hexString2Bytes(String hex){
if ((hex==null)||(hex.equals(""))) {
return null;
}else if (hex.length()%2 != 0) {
return null;
}else{
hex = hex.toUpperCase();
int len = hex.length()/2;
byte[] b = new byte[len];
char[] hc = hex.toCharArray();
for (int i = 0; i < len; i++) {
int p=2*i;
b[i] = (byte)(charToByte(hc[p])<<4 | charToByte(hc[p+1]));
}
return b;
}
}
/*
* 字节数组转字符串
*/
public static String bytes2String(byte[] b) throws UnsupportedEncodingException{
String r = null;
r = new String(b,"GBK");
return r;
}
/*
* 字符串转字节组
*/
public static byte[] string2Bytes(String s){
byte[] r = s.getBytes();
return r;
}
/*
* 16进组字符串转字符串
*/
public static String hex2String(String hex){
String r = bytes2HexString(hexString2Bytes(hex));
return r;
}
/*
* 字符串转16进组字符串
*/
public static String string2HexString(String s){
String r = bytes2HexString(string2Bytes(s));
return r;
}
private void LoandFragment(Fragment fragment){
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.fm, fragment);
ft.commitAllowingStateLoss();
}
private void initDate(){
byte b1 = (byte) 45;
Log.i("md", "1.字节转10进制:" + byte2Int(b1));
int i = 89;
Log.i("md", "2.10进制转字节:" + int2Byte(i));
byte[] b2 = new byte[]{(byte)0xFF, (byte)0x5F, (byte)0x6, (byte)0x5A};
Log.i("md", "3.字节数组转16进制字符串:" + bytes2HexString(b2));
String s1 = new String("1DA47C");
Log.i("md", "4.16进制字符串转字节数组:" + Arrays.toString(hexString2Bytes(s1)));
try {
Log.i("md", "5.字节数组转字符串:" + bytes2String(b2));
} catch (UnsupportedEncodingException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.i("md", "6.字符串转字节数组:" + Arrays.toString(string2Bytes(s1)));
Log.i("md", "7.16进制字符串转字符串:" + hex2String(s1));
String s2 = new String("Hello!");
Log.i("md", "8.字符串转16进制字符串:" + string2HexString(s2));
}

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原始发表：2018-05-24，如有侵权请联系 cloudcommunity@tencent.com 删除

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笔记75 | Java字节、十进制、十六进制、字符串之间的相互转换

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