加密工具类
加密工具類，包含MD5,BASE64,SHA,CRC32的加密與解密方法。
源碼如下：(點擊下載 -CryptoUtils.java、commons-io-2.4.jar、commons-codec-1.9.jar)
1 import java.io.BufferedInputStream;
2 import java.io.File;
3 import java.io.FileInputStream;
4 import java.io.FileNotFoundException;
5 import java.io.IOException;
6 import java.io.InputStream;
7 import java.io.UnsupportedEncodingException;
8 import java.net.URL;
9 import java.util.zip.CRC32;
10 import java.util.zip.CheckedInputStream;
11 import org.apache.commons.codec.binary.Base64;
12 import org.apache.commons.codec.digest.DigestUtils;
13 import org.apache.commons.io.IOUtils;
14
15 /**
16 * 加密工具類，包含MD5,BASE64,SHA,CRC32
17 *
18 */
19 public class CryptoUtils {
20
21 private static final String DEFAULT_CHARSET = "UTF-8";
22
23 /**
24 * MD5加密
25 *
26 * @param bytes
27 * an array of byte.
28 * @return a {@link java.lang.String} object.
29 */
30 public static String encodeMD5(final byte[] bytes) {
31 return DigestUtils.md5Hex(bytes);
32 }
33
34 /**
35 * MD5加密，默認UTF-8
36 *
37 * @param str
38 * a {@link java.lang.String} object.
39 * @return a {@link java.lang.String} object.
40 */
41 public static String encodeMD5(final String str) {
42 return encodeMD5(str, DEFAULT_CHARSET);
43 }
44
45 /**
46 * MD5加密
47 *
48 * @param str
49 * a {@link java.lang.String} object.
50 * @param charset
51 * a {@link java.lang.String} object.
52 * @return a {@link java.lang.String} object.
53 */
54 public static String encodeMD5(final String str, final String charset) {
55 if (str == null) {
56 return null;
57 }
58 try {
59 byte[] bytes = str.getBytes(charset);
60 return encodeMD5(bytes);
61 } catch (UnsupportedEncodingException e) {
62 throw new RuntimeException(e);
63 }
64 }
65
66 /**
67 * SHA加密
68 *
69 * @param bytes
70 * an array of byte.
71 * @return a {@link java.lang.String} object.
72 */
73 public static String encodeSHA(final byte[] bytes) {
74 return DigestUtils.sha512Hex(bytes);
75 }
76
77 /**
78 * SHA加密
79 *
80 * @param str
81 * a {@link java.lang.String} object.
82 * @param charset
83 * a {@link java.lang.String} object.
84 * @return a {@link java.lang.String} object.
85 */
86 public static String encodeSHA(final String str, final String charset) {
87 if (str == null) {
88 return null;
89 }
90 try {
91 byte[] bytes = str.getBytes(charset);
92 return encodeSHA(bytes);
93 } catch (UnsupportedEncodingException e) {
94 throw new RuntimeException(e);
95 }
96 }
97
98 /**
99 * SHA加密,默認utf-8
100 *
101 * @param str
102 * a {@link java.lang.String} object.
103 * @return a {@link java.lang.String} object.
104 */
105 public static String encodeSHA(final String str) {
106 return encodeSHA(str, DEFAULT_CHARSET);
107 }
108
109 /**
110 * BASE64加密
111 *
112 * @param bytes
113 * an array of byte.
114 * @return a {@link java.lang.String} object.
115 */
116 public static String encodeBASE64(final byte[] bytes) {
117 return new String(Base64.encodeBase64String(bytes));
118 }
119
120 /**
121 * BASE64加密
122 *
123 * @param str
124 * a {@link java.lang.String} object.
125 * @param charset
126 * a {@link java.lang.String} object.
127 * @return a {@link java.lang.String} object.
128 */
129 public static String encodeBASE64(final String str, String charset) {
130 if (str == null) {
131 return null;
132 }
133 try {
134 byte[] bytes = str.getBytes(charset);
135 return encodeBASE64(bytes);
136 } catch (UnsupportedEncodingException e) {
137 throw new RuntimeException(e);
138 }
139 }
140
141 /**
142 * BASE64加密,默認UTF-8
143 *
144 * @param str
145 * a {@link java.lang.String} object.
146 * @return a {@link java.lang.String} object.
147 */
148 public static String encodeBASE64(final String str) {
149 return encodeBASE64(str, DEFAULT_CHARSET);
150 }
151
152 /**
153 * BASE64解密,默認UTF-8
154 *
155 * @param str
156 * a {@link java.lang.String} object.
157 * @return a {@link java.lang.String} object.
158 */
159 public static String decodeBASE64(String str) {
160 return decodeBASE64(str, DEFAULT_CHARSET);
161 }
162
163 /**
164 * BASE64解密
165 *
166 * @param str
167 * a {@link java.lang.String} object.
168 * @param charset
169 * 字符編碼
170 * @return a {@link java.lang.String} object.
171 */
172 public static String decodeBASE64(String str, String charset) {
173 try {
174 byte[] bytes = str.getBytes(charset);
175 return new String(Base64.decodeBase64(bytes));
176 } catch (UnsupportedEncodingException e) {
177 throw new RuntimeException(e);
178 }
179 }
180
181 /**
182 * CRC32字節(jié)校驗
183 *
184 * @param bytes
185 * an array of byte.
186 * @return a {@link java.lang.String} object.
187 */
188 public static String crc32(byte[] bytes) {
189 CRC32 crc32 = new CRC32();
190 crc32.update(bytes);
191 return Long.toHexString(crc32.getValue());
192 }
193
194 /**
195 * CRC32字符串校驗
196 *
197 * @param str
198 * a {@link java.lang.String} object.
199 * @param charset
200 * a {@link java.lang.String} object.
201 * @return a {@link java.lang.String} object.
202 */
203 public static String crc32(final String str, String charset) {
204 try {
205 byte[] bytes = str.getBytes(charset);
206 return crc32(bytes);
207 } catch (UnsupportedEncodingException e) {
208 throw new RuntimeException(e);
209 }
210 }
211
212 /**
213 * CRC32字符串校驗,默認UTF-8編碼讀取
214 *
215 * @param str
216 * a {@link java.lang.String} object.
217 * @return a {@link java.lang.String} object.
218 */
219 public static String crc32(final String str) {
220 return crc32(str, DEFAULT_CHARSET);
221 }
222
223 /**
224 * CRC32流校驗
225 *
226 * @param input
227 * a {@link java.io.InputStream} object.
228 * @return a {@link java.lang.String} object.
229 */
230 public static String crc32(InputStream input) {
231 CRC32 crc32 = new CRC32();
232 CheckedInputStream checkInputStream = null;
233 int test = 0;
234 try {
235 checkInputStream = new CheckedInputStream(input, crc32);
236 do {
237 test = checkInputStream.read();
238 } while (test != -1);
239 return Long.toHexString(crc32.getValue());
240 } catch (IOException e) {
241 e.printStackTrace();
242 throw new RuntimeException(e);
243 }
244 }
245
246 /**
247 * CRC32文件唯一校驗
248 *
249 * @param file
250 * a {@link java.io.File} object.
251 * @return a {@link java.lang.String} object.
252 */
253 public static String crc32(File file) {
254 InputStream input = null;
255 try {
256 input = new BufferedInputStream(new FileInputStream(file));
257 return crc32(input);
258 } catch (FileNotFoundException e) {
259 e.printStackTrace();
260 throw new RuntimeException(e);
261 } finally {
262 IOUtils.closeQuietly(input);
263 }
264 }
265
266 /**
267 * CRC32文件唯一校驗
268 *
269 * @param url
270 * a {@link java.net.URL} object.
271 * @return a {@link java.lang.String} object.
272 */
273 public static String crc32(URL url) {
274 InputStream input = null;
275 try {
276 input = url.openStream();
277 return crc32(input);
278 } catch (IOException e) {
279 e.printStackTrace();
280 throw new RuntimeException(e);
281 } finally {
282 IOUtils.closeQuietly(input);
283 }
284 }
285 }
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