1.把整型轉(zhuǎn)換成指定長度的數(shù)組字節(jié)流

public static byte[] int2bytes(int integer, int len) {

//?? if (integer < 0) { throw new IllegalArgumentException("Can not cast negative to bytes : " + integer); }

ByteArrayOutputStream bo = new ByteArrayOutputStream();

for (int i = 0; i < len; i++) {

bo.write(integer);

integer = integer >> 8;

}

byte[] res=reversEndian(bo.toByteArray(),len);

return res;

}

private static byte[] reversEndian(byte str[],int len) {

byte b;

byte res[]=new byte[len];

for(int i=0;i

{

b=str[i];

res[len-i-1]=b;

}

return res;

}

2.把整型轉(zhuǎn)換成TLV方式的字節(jié)數(shù)組流

public static byte[] int2TLVbytes(int tag,int value,int len) throws IOException{

byte[] tag1=int2bytes(tag,4);

byte[] length1=int2bytes(len,4);

byte[] value1=int2bytes(value,len);

byte[] buff=pack(tag1,length1,value1);

return buff;

}

3.把UTF-8的string轉(zhuǎn)換成指定長度的字節(jié)數(shù)組流，不足部分補(bǔ)0x00

public static byte[] UTF8string2bytes(String source, int length,byte fillByte) {

byte[] dst = new byte[length];

if (source == null) {

for (int i = 0; i < length; i++) {

dst[i] = fillByte;

}

return dst;

}

try {

byte[] b = source.getBytes("UTF-8");

if (b.length > length) {

System.arraycopy(b, 0, dst, 0, length);

} else {

System.arraycopy(b, 0, dst, 0, b.length);

for (int i = dst.length; i < length; i++) {

dst[i] = fillByte;

}

}

} catch (Exception e) {

for (int i = 0; i < length; i++) {

dst[i] = fillByte;

}

}

return dst;

}

4.把string轉(zhuǎn)換成TLV編碼方式的字節(jié)數(shù)組流

public static byte[] UTF8string2TLVbytes(int tag,String value){

int length=value.length();

byte[] tag1=int2bytes(tag,4);

byte[] length1=int2bytes(length,4);

byte[] value1 = null;

try {

value1 = UTF8string2bytes(value,value.getBytes("UTF-8").length,(byte)0x00);

} catch (UnsupportedEncodingException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

byte[] buff=pack(tag1,length1,value1);

return buff;

}

5.把字節(jié)流轉(zhuǎn)換成UTF-8字符串

public static String bytes2UTF8string(byte source[]) {

String dst = "";

try {

dst = (new String(source, "UTF-8"));

} catch (UnsupportedEncodingException e) {

dst = "";

}

return dst;

}

6.將字節(jié)流中的指定字節(jié)段轉(zhuǎn)換成UTF-8字符型

public static String bytes2UTF8string2(byte b[],int offset,int len){

byte[] a=new byte[len];

for (int i=0;i

a[i]=b[offset];

offset++;

}

return bytes2UTF8string(a);

}

7.字節(jié)流數(shù)據(jù)轉(zhuǎn)換成整型

public static int bytes2int(byte b[]) {

int s = 0;

for (int i = 0; i < b.length; i++) {

s = s | ((b[i] & 0xff) << ((b.length - i - 1) * 8));

}

return s;

}

8.將字節(jié)流中的指定字節(jié)段轉(zhuǎn)換成整型

public static int bytes2int2(byte b[],int offset,int len){

byte[] respcode=new byte[len];

for (int i=0;i

respcode[i]=b[offset];

offset++;

}

return bytes2int(respcode);

}

其中部分引用Java中Byte字節(jié)流處理的自定義方法庫1中設(shè)計(jì)的方法。

總結(jié)

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