JAVA 字节顺序转换

我会带着你远行 2022-08-06 20:29 271阅读 0赞

Java代码 ![收藏代码][icon_star.png]

1.  /\*\*
2.  \* 通信格式转换
3.  \*
4.  \* Java和一些windows编程语言如c、c++、delphi所写的网络程序进行通讯时，需要进行相应的转换
5.  \* 高、低字节之间的转换
6.  \* windows的字节序为低字节开头
7.  \* linux,unix的字节序为高字节开头
8.  \* java则无论平台变化，都是高字节开头
9.   \*/
10. 
11. **public** **class** FormatTransfer \{ 
12. /\*\*
13.  \* 将int转为低字节在前，高字节在后的byte数组
14.  \* @param n int
15.  \* @return byte\[\]
16.  \*/
17. **public** **static** **byte**\[\] toLH(**int** n) \{ 
18. **byte**\[\] b = **new** **byte**\[4\]; 
19.  b\[0\] = (**byte**) (n & 0xff); 
20.  b\[1\] = (**byte**) (n >> 8 & 0xff); 
21.  b\[2\] = (**byte**) (n >> 16 & 0xff); 
22.  b\[3\] = (**byte**) (n >> 24 & 0xff); 
23. **return** b; 
24. \} 
25. 
26. /\*\*
27.  \* 将int转为高字节在前，低字节在后的byte数组
28.  \* @param n int
29.  \* @return byte\[\]
30.  \*/
31. **public** **static** **byte**\[\] toHH(**int** n) \{ 
32. **byte**\[\] b = **new** **byte**\[4\]; 
33.  b\[3\] = (**byte**) (n & 0xff); 
34.  b\[2\] = (**byte**) (n >> 8 & 0xff); 
35.  b\[1\] = (**byte**) (n >> 16 & 0xff); 
36.  b\[0\] = (**byte**) (n >> 24 & 0xff); 
37. **return** b; 
38. \} 
39. 
40. /\*\*
41.  \* 将short转为低字节在前，高字节在后的byte数组
42.  \* @param n short
43.  \* @return byte\[\]
44.  \*/
45. **public** **static** **byte**\[\] toLH(**short** n) \{ 
46. **byte**\[\] b = **new** **byte**\[2\]; 
47.  b\[0\] = (**byte**) (n & 0xff); 
48.  b\[1\] = (**byte**) (n >> 8 & 0xff); 
49. **return** b; 
50. \} 
51. 
52. /\*\*
53.  \* 将short转为高字节在前，低字节在后的byte数组
54.  \* @param n short
55.  \* @return byte\[\]
56.  \*/
57. **public** **static** **byte**\[\] toHH(**short** n) \{ 
58. **byte**\[\] b = **new** **byte**\[2\]; 
59.  b\[1\] = (**byte**) (n & 0xff); 
60.  b\[0\] = (**byte**) (n >> 8 & 0xff); 
61. **return** b; 
62. \} 
63. 
64. 
65. 
66. /\*\*
67.  \* 将将int转为高字节在前，低字节在后的byte数组 
68. 
69. public static byte\[\] toHH(int number) \{ 
70.  int temp = number;
71.  byte\[\] b = new byte\[4\];
72.  for (int i = b.length - 1; i > -1; i--) \{ 
73.  b = new Integer(temp & 0xff).byteValue();
74.  temp = temp >> 8;
75.  \}
76.  return b;
77. \} 
78. 
79. public static byte\[\] IntToByteArray(int i) \{ 
80.  byte\[\] abyte0 = new byte\[4\];
81.  abyte0\[3\] = (byte) (0xff & i);
82.  abyte0\[2\] = (byte) ((0xff00 & i) >> 8);
83.  abyte0\[1\] = (byte) ((0xff0000 & i) >> 16);
84.  abyte0\[0\] = (byte) ((0xff000000 & i) >> 24);
85.  return abyte0;
86. \} 
87. 
88. 
89. \*/
90. 
91. /\*\*
92.  \* 将float转为低字节在前，高字节在后的byte数组
93.  \*/
94. **public** **static** **byte**\[\] toLH(**float** f) \{ 
95. **return** toLH(Float.floatToRawIntBits(f)); 
96. \} 
97. 
98. /\*\*
99.  \* 将float转为高字节在前，低字节在后的byte数组
100.  \*/
101. **public** **static** **byte**\[\] toHH(**float** f) \{ 
102. **return** toHH(Float.floatToRawIntBits(f)); 
103. \} 
104. 
105. /\*\*
106.  \* 将String转为byte数组
107.  \*/
108. **public** **static** **byte**\[\] stringToBytes(String s, **int** length) \{ 
109. **while** (s.getBytes().length < length) \{ 
110.  s += " "; 
111.  \} 
112. **return** s.getBytes(); 
113. \} 
114. 
115. 
116. /\*\*
117.  \* 将字节数组转换为String
118.  \* @param b byte\[\]
119.  \* @return String
120.  \*/
121. **public** **static** String bytesToString(**byte**\[\] b) \{ 
122.  StringBuffer result = **new** StringBuffer(""); 
123. **int** length = b.length; 
124. **for** (**int** i=0; i<length; i++) \{ 
125.  result.append((**char**)(b & 0xff)); 
126.  \} 
127. **return** result.toString(); 
128. \} 
129. 
130. /\*\*
131.  \* 将字符串转换为byte数组
132.  \* @param s String
133.  \* @return byte\[\]
134.  \*/
135. **public** **static** **byte**\[\] stringToBytes(String s) \{ 
136. **return** s.getBytes(); 
137. \} 
138. 
139. /\*\*
140.  \* 将高字节数组转换为int
141.  \* @param b byte\[\]
142.  \* @return int
143.  \*/
144. **public** **static** **int** hBytesToInt(**byte**\[\] b) \{ 
145. **int** s = 0; 
146. **for** (**int** i = 0; i < 3; i++) \{ 
147. **if** (b >= 0) \{ 
148.  s = s + b; 
149.  \} **else** \{ 
150.  s = s + 256 \+ b; 
151.  \} 
152.  s = s \* 256; 
153.  \} 
154. **if** (b\[3\] >= 0) \{ 
155.  s = s + b\[3\]; 
156.  \} **else** \{ 
157.  s = s + 256 \+ b\[3\]; 
158.  \} 
159. **return** s; 
160. \} 
161. 
162. /\*\*
163.  \* 将低字节数组转换为int
164.  \* @param b byte\[\]
165.  \* @return int
166.  \*/
167. **public** **static** **int** lBytesToInt(**byte**\[\] b) \{ 
168. **int** s = 0; 
169. **for** (**int** i = 0; i < 3; i++) \{ 
170. **if** (b\[3\-i\] >= 0) \{ 
171.  s = s + b\[3\-i\]; 
172.  \} **else** \{ 
173.  s = s + 256 \+ b\[3\-i\]; 
174.  \} 
175.  s = s \* 256; 
176.  \} 
177. **if** (b\[0\] >= 0) \{ 
178.  s = s + b\[0\]; 
179.  \} **else** \{ 
180.  s = s + 256 \+ b\[0\]; 
181.  \} 
182. **return** s; 
183. \} 
184. 
185. 
186. /\*\*
187.  \* 高字节数组到short的转换
188.  \* @param b byte\[\]
189.  \* @return short
190.  \*/
191. **public** **static** **short** hBytesToShort(**byte**\[\] b) \{ 
192. **int** s = 0; 
193. **if** (b\[0\] >= 0) \{ 
194.  s = s + b\[0\]; 
195.  \} **else** \{ 
196.  s = s + 256 \+ b\[0\]; 
197.  \} 
198.  s = s \* 256; 
199. **if** (b\[1\] >= 0) \{ 
200.  s = s + b\[1\]; 
201.  \} **else** \{ 
202.  s = s + 256 \+ b\[1\]; 
203.  \} 
204. **short** result = (**short**)s; 
205. **return** result; 
206. \} 
207. 
208. /\*\*
209.  \* 低字节数组到short的转换
210.  \* @param b byte\[\]
211.  \* @return short
212.  \*/
213. **public** **static** **short** lBytesToShort(**byte**\[\] b) \{ 
214. **int** s = 0; 
215. **if** (b\[1\] >= 0) \{ 
216.  s = s + b\[1\]; 
217.  \} **else** \{ 
218.  s = s + 256 \+ b\[1\]; 
219.  \} 
220.  s = s \* 256; 
221. **if** (b\[0\] >= 0) \{ 
222.  s = s + b\[0\]; 
223.  \} **else** \{ 
224.  s = s + 256 \+ b\[0\]; 
225.  \} 
226. **short** result = (**short**)s; 
227. **return** result; 
228. \} 
229. 
230. /\*\*
231.  \* 高字节数组转换为float
232.  \* @param b byte\[\]
233.  \* @return float
234.  \*/
235. **public** **static** **float** hBytesToFloat(**byte**\[\] b) \{ 
236. **int** i = 0; 
237.  Float F = **new** Float(0.0); 
238.  i = ((((b\[0\]&0xff)<<8 | (b\[1\]&0xff))<<8) | (b\[2\]&0xff))<<8 | (b\[3\]&0xff); 
239. **return** F.intBitsToFloat(i); 
240. \} 
241. 
242. /\*\*
243.  \* 低字节数组转换为float
244.  \* @param b byte\[\]
245.  \* @return float
246.  \*/
247. **public** **static** **float** lBytesToFloat(**byte**\[\] b) \{ 
248. **int** i = 0; 
249.  Float F = **new** Float(0.0); 
250.  i = ((((b\[3\]&0xff)<<8 | (b\[2\]&0xff))<<8) | (b\[1\]&0xff))<<8 | (b\[0\]&0xff); 
251. **return** F.intBitsToFloat(i); 
252. \} 
253. 
254. /\*\*
255.  \* 将byte数组中的元素倒序排列
256.  \*/
257. **public** **static** **byte**\[\] bytesReverseOrder(**byte**\[\] b) \{ 
258. **int** length = b.length; 
259. **byte**\[\] result = **new** **byte**\[length\]; 
260. **for**(**int** i=0; i<length; i++) \{ 
261.  result\[length-i-1\] = b; 
262.  \} 
263. **return** result; 
264. \} 
265. 
266. /\*\*
267.  \* 打印byte数组
268.  \*/
269. **public** **static** **void** printBytes(**byte**\[\] bb) \{ 
270. **int** length = bb.length; 
271. **for** (**int** i=0; i<length; i++) \{ 
272.  System.out.print(bb + " "); 
273.  \} 
274.  System.out.println(""); 
275. \} 
276. 
277. **public** **static** **void** logBytes(**byte**\[\] bb) \{ 
278. **int** length = bb.length; 
279.  String out = ""; 
280. **for** (**int** i=0; i<length; i++) \{ 
281.  out = out + bb + " "; 
282.  \} 
283. 
284. \} 
285. 
286. /\*\*
287.  \* 将int类型的值转换为字节序颠倒过来对应的int值
288.  \* @param i int
289.  \* @return int
290.  \*/
291. **public** **static** **int** reverseInt(**int** i) \{ 
292. **int** result = FormatTransfer.hBytesToInt(FormatTransfer.toLH(i)); 
293. **return** result; 
294. \} 
295. 
296. /\*\*
297.  \* 将short类型的值转换为字节序颠倒过来对应的short值
298.  \* @param s short
299.  \* @return short
300.  \*/
301. **public** **static** **short** reverseShort(**short** s) \{ 
302. **short** result = FormatTransfer.hBytesToShort(FormatTransfer.toLH(s)); 
303. **return** result; 
304. \} 
305. 
306. /\*\*
307.  \* 将float类型的值转换为字节序颠倒过来对应的float值
308.  \* @param f float
309.  \* @return float
310.  \*/
311. **public** **static** **float** reverseFloat(**float** f) \{ 
312. **float** result = FormatTransfer.hBytesToFloat(FormatTransfer.toLH(f)); 
313. **return** result; 
314. \}

扩展：

1.  /\*\*
2.   \* 将double转为低字节在前，高字节在后的byte数组
3.   \* @param n double
4.   \* @return byte\[\]
5.   \*/

1.  public static byte\[\] toLH(double n) \{  
    long raw = Double.doubleToRawLongBits(n);  
    int h = (int)(raw >> 32);  
    int l = (int)(raw & 0x00000000FFFFFFFF);  
      
    byte\[\] hb = toLH(h);  
    byte\[\] lb = toLH(l);  
      
    byte\[\] res = new byte\[8\];  
    System.arraycopy(hb, 0, res, 4, 4);  
    System.arraycopy(lb, 0, res, 0, 4);  
      
    return res;  
    \}

[byte\[\]数组转为][byte]Double

1.  static double ArryToDouble(byte\[\] Array,int Pos)  
    \{  
    long accum = 0;  
    accum = Array\[Pos+0\] & 0xFF;  
    accum |= (long)(Array\[Pos+1\] & 0xFF)<<8;  
    accum |= (long)(Array\[Pos+2\] & 0xFF)<<16;  
    accum |= (long)(Array\[Pos+3\] & 0xFF)<<24;  
    accum |= (long)(Array\[Pos+4\] & 0xFF)<<32;  
    accum |= (long)(Array\[Pos+5\] & 0xFF)<<40;  
    accum |= (long)(Array\[Pos+6\] & 0xFF)<<48;  
    accum |= (long)(Array\[Pos+7\] & 0xFF)<<56;  
    return Double.longBitsToDouble(accum);

1.  \}

1.  byte\[\]转为float

1.  static float ArryToFloat(byte\[\] Array,int Pos)  
    \{  
    int accum = 0;  
    accum = Array\[Pos+0\] & 0xFF;  
    accum |= (long)(Array\[Pos+1\] & 0xFF)<<8;  
    accum |= (long)(Array\[Pos+2\] & 0xFF)<<16;  
    accum |= (long)(Array\[Pos+3\] & 0xFF)<<24;  
    return Float.intBitsToFloat(accum);  
    \}

1.  public static int bytesToInt(byte\[\] src, int offset) \{  
     int value;  
     value = (int) ((src\[offset\] & 0xFF)  
     | ((src\[offset+1\] & 0xFF)<<8)  
     | ((src\[offset+2\] & 0xFF)<<16)  
     | ((src\[offset+3\] & 0xFF)<<24));  
     return value;  
    \}

1.  float转换为byte\[\]

1.  static byte\[\] FloatToArray(float Value)  
    \{  
    int accum = Float.floatToRawIntBits(Value);  
    byte\[\] byteRet = new byte\[4\];  
    byteRet\[0\] = (byte)(accum & 0xFF);  
    byteRet\[1\] = (byte)((accum>>8) & 0xFF);  
    byteRet\[2\] = (byte)((accum>>16) & 0xFF);  
    byteRet\[3\] = (byte)((accum>>24) & 0xFF);  
    return byteRet;  
    \}

转自：http://origin100.iteye.com/blog/267165

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