今天，问以前的同事，他们写接口按什么编码，怎么看到有\u的一些看不懂的内容，一问，原来是信息隐藏，防止信息泄漏。
然后在网上查了Java如何把中文转换成unicode编码，转自：http://blog.csdn.net/sunmenggmail/article/details/27539023
1 package mobi.chenwei.wing.util;
2
3 public class CharacterSetToolkit {
4
5 /**
6 * @param args
7 */
8 public static void main(String[] args) {
9 // TODO Auto-generated method stub
10 String s = "天津";
11 System.out.println("Original:\t\t" + s);
12
13 s = toEncodedUnicode(s, true);
14 System.out.println("to unicode:\t\t" + s);
15
16
17 s = fromEncodedUnicode(s.toCharArray(), 0, s.length());
18 System.out.println("from unicode:\t" + s);
19
20
21 }
22 private static final char[] hexDigit = { ‘0‘, ‘1‘, ‘2‘, ‘3‘, ‘4‘, ‘5‘, ‘6‘, ‘7‘, ‘8‘, ‘9‘, ‘A‘,
23 ‘B‘, ‘C‘, ‘D‘, ‘E‘, ‘F‘ };
24
25 private static char toHex(int nibble) {
26 return hexDigit[(nibble & 0xF)];
27 }
28 /**
29 * 将字符串编码成 Unicode 形式的字符串. 如 "黄" to "\u9EC4"
30 * Converts unicodes to encoded \\uxxxx and escapes
31 * special characters with a preceding slash
32 *
33 * @param theString
34 * 待转换成Unicode编码的字符串。
35 * @param escapeSpace
36 * 是否忽略空格，为true时在空格后面是否加个反斜杠。
37 * @return 返回转换后Unicode编码的字符串。
38 */
39 public static String toEncodedUnicode(String theString, boolean escapeSpace) {
40 int len = theString.length();
41 int bufLen = len * 2;
42 if (bufLen < 0) {
43 bufLen = Integer.MAX_VALUE;
44 }
45 StringBuffer outBuffer = new StringBuffer(bufLen);
46
47 for (int x = 0; x < len; x++) {
48 char aChar = theString.charAt(x);
49 // Handle common case first, selecting largest block that
50 // avoids the specials below
51 if ((aChar > 61) && (aChar < 127)) {
52 if (aChar == ‘\\‘) {
53 outBuffer.append(‘\\‘);
54 outBuffer.append(‘\\‘);
55 continue;
56 }
57 outBuffer.append(aChar);
58 continue;
59 }
60
61 switch (aChar) {
62 case ‘ ‘:
63 if (x == 0 || escapeSpace) outBuffer.append(‘\\‘);
64 outBuffer.append(‘ ‘);
65 break;
66 case ‘\t‘:
67 outBuffer.append(‘\\‘);
68 outBuffer.append(‘t‘);
69 break;
70 case ‘\n‘:
71 outBuffer.append(‘\\‘);
72 outBuffer.append(‘n‘);
73 break;
74 case ‘\r‘:
75 outBuffer.append(‘\\‘);
76 outBuffer.append(‘r‘);
77 break;
78 case ‘\f‘:
79 outBuffer.append(‘\\‘);
80 outBuffer.append(‘f‘);
81 break;
82 case ‘=‘: // Fall through
83 case ‘:‘: // Fall through
84 case ‘#‘: // Fall through
85 case ‘!‘:
86 outBuffer.append(‘\\‘);
87 outBuffer.append(aChar);
88 break;
89 default:
90 if ((aChar < 0x0020) || (aChar > 0x007e)) {
91 // 每个unicode有16位，每四位对应的16进制从高位保存到低位
92 outBuffer.append(‘\\‘);
93 outBuffer.append(‘u‘);
94 outBuffer.append(toHex((aChar >> 12) & 0xF));
95 outBuffer.append(toHex((aChar >> 8) & 0xF));
96 outBuffer.append(toHex((aChar >> 4) & 0xF));
97 outBuffer.append(toHex(aChar & 0xF));
98 } else {
99 outBuffer.append(aChar);
100 }
101 }
102 }
103 return outBuffer.toString();
104 }
105
106 /**
107 * 从 Unicode 形式的字符串转换成对应的编码的特殊字符串。 如 "\u9EC4" to "黄".
108 * Converts encoded \\uxxxx to unicode chars
109 * and changes special saved chars to their original forms
110 *
111 * @param in
112 * Unicode编码的字符数组。
113 * @param off
114 * 转换的起始偏移量。
115 * @param len
116 * 转换的字符长度。
117 * @param convtBuf
118 * 转换的缓存字符数组。
119 * @return 完成转换，返回编码前的特殊字符串。
120 */
121 public static String fromEncodedUnicode(char[] in, int off, int len) {
122 char aChar;
123 char[] out = new char[len]; // 只短不长
124 int outLen = 0;
125 int end = off + len;
126
127 while (off < end) {
128 aChar = in[off++];
129 if (aChar == ‘\\‘) {
130 aChar = in[off++];
131 if (aChar == ‘u‘) {
132 // Read the xxxx
133 int value = 0;
134 for (int i = 0; i < 4; i++) {
135 aChar = in[off++];
136 switch (aChar) {
137 case ‘0‘:
138 case ‘1‘:
139 case ‘2‘:
140 case ‘3‘:
141 case ‘4‘:
142 case ‘5‘:
143 case ‘6‘:
144 case ‘7‘:
145 case ‘8‘:
146 case ‘9‘:
147 value = (value << 4) + aChar - ‘0‘;
148 break;
149 case ‘a‘:
150 case ‘b‘:
151 case ‘c‘:
152 case ‘d‘:
153 case ‘e‘:
154 case ‘f‘:
155 value = (value << 4) + 10 + aChar - ‘a‘;
156 break;
157 case ‘A‘:
158 case ‘B‘:
159 case ‘C‘:
160 case ‘D‘:
161 case ‘E‘:
162 case ‘F‘:
163 value = (value << 4) + 10 + aChar - ‘A‘;
164 break;
165 default:
166 throw new IllegalArgumentException("Malformed \\uxxxx encoding.");
167 }
168 }
169 out[outLen++] = (char) value;
170 } else {
171 if (aChar == ‘t‘) {
172 aChar = ‘\t‘;
173 } else if (aChar == ‘r‘) {
174 aChar = ‘\r‘;
175 } else if (aChar == ‘n‘) {
176 aChar = ‘\n‘;
177 } else if (aChar == ‘f‘) {
178 aChar = ‘\f‘;
179 }
180 out[outLen++] = aChar;
181 }
182 } else {
183 out[outLen++] = (char) aChar;
184 }
185 }
186 return new String(out, 0, outLen);
187 }
188 }
运行结果：
Original: 天津
to unicode: \u5929\u6D25
from unicode: 天津
这时候，我们在写接口时，希望把中文进入这个方法中进行隐藏。
人生总是有许多事情是徒劳的，但是不要因为徒劳，而不去做这件事情，挖掘自己的潜力。
时间： 2024-08-07 14:25:14