加密工具类

加密工具类，包含MD5,BASE64,SHA,CRC32的加密与解密方法。
源码如下：(点击下载 - 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  * 加密工具类，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，默认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,默认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,默认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,默认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      *            字符编码
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字节校验
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字符串校验
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字符串校验,默认UTF-8编码读取
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流校验
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文件唯一校验
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文件唯一校验
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 }