java工具包

技术2022-05-11 71

import javax.crypto.SecretKey;import javax.crypto.spec.SecretKeySpec;import java.net.URL;import java.net.HttpURLConnection;import java.io.PrintWriter;import java.io.BufferedReader;import java.io.InputStreamReader;

/** * Created by IntelliJ IDEA. * User: zhengzhg * Mail: snake_country@sina.com * Date: 2004-10-13 * Time: 15:30:28 * To change this template use File | Settings | File Templates. * 常用工具包。包括生成各种密码随机串，加密解密，编码解码，执行url等 */

public class CryptTool { /** * 生成密码. * @param count 密码位数 * @param letters 是否包含字符 * @param numbers 是否包含数字 * @return String password */ public static String getPassword(int count, boolean letters, boolean numbers) { return org.apache.commons.lang.RandomStringUtils.random(count, letters, numbers); }

/** * 生成字符数字混合的密码. * @param count 密码位数 * @return String password */ private static String getPassword(int count) { return getPassword(count, true, true); }

/** * 生成纯数字密码. * @param count 密码位数 * @return String password */ public static String getPasswordOfNumber(int count) { return getPassword(count, false, true); }

/** * 生成纯字符密码. * @param count 密码位数 * @return String password */ public static String getPasswordOfCharacter(int count) { return getPassword(count, true, false); }

/** * 生成3DES密钥. * @param key_byte seed key * @throws Exception * @return javax.crypto.SecretKey Generated DES key */ public static javax.crypto.SecretKey genDESKey(byte[] key_byte) throws Exception { SecretKey k = new SecretKeySpec(key_byte, "DESede");

return k; }

/** * 3DES 解密(byte[]). * @param key SecretKey * @param crypt byte[] * @throws Exception * @return byte[] */ public static byte[] desDecrypt(javax.crypto.SecretKey key, byte[] crypt) throws Exception { javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance("DESede"); cipher.init(javax.crypto.Cipher.DECRYPT_MODE, key);

return cipher.doFinal(crypt); }

/** * 3DES 解密(String). * @param key SecretKey * @param crypt byte[] * @throws Exception * @return byte[] */ public static String desDecrypt(javax.crypto.SecretKey key, String crypt) throws Exception { return new String(desDecrypt(key, crypt.getBytes())); }

/** * 3DES加密(byte[]). * @param key SecretKey * @param src byte[] * @throws Exception * @return byte[] */ public static byte[] desEncrypt(javax.crypto.SecretKey key, byte[] src) throws Exception { javax.crypto.Cipher cipher = javax.crypto.Cipher.getInstance("DESede"); cipher.init(javax.crypto.Cipher.ENCRYPT_MODE, key);

return cipher.doFinal(src); }

/** * 3DES加密(String). * @param key SecretKey * @param src byte[] * @throws Exception * @return byte[] */ public static String desEncrypt(javax.crypto.SecretKey key, String src) throws Exception { return new String(desEncrypt(key, src.getBytes())); }

/** * MD5 摘要计算(byte[]). * @param src byte[] * @throws Exception * @return byte[] 16 bit digest */ public static byte[] md5Digest(byte[] src) throws Exception { java.security.MessageDigest alg = java.security.MessageDigest.getInstance("MD5"); // MD5 is 16 bit message digest

return alg.digest(src); }

/** * MD5 摘要计算(String). * @param src String * @throws Exception * @return String */ public static String md5Digest(String src) throws Exception { return new String(md5Digest(src.getBytes())); }

/** * BASE64 编码. * @param src String inputed string * @return String returned string */ public static String base64Encode(String src) { sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();

return encoder.encode(src.getBytes()); }

/** * BASE64 编码(byte[]). * @param src byte[] inputed string * @return String returned string */ public static String base64Encode(byte[] src) { sun.misc.BASE64Encoder encoder = new sun.misc.BASE64Encoder();

return encoder.encode(src); }

/** * BASE64 解码. * @param src String inputed string * @return String returned string */ public static String base64Decode(String src) { sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();

try { return new String(decoder.decodeBuffer(src)); } catch (Exception ex) { return null; } }

/** * BASE64 解码(to byte[]). * @param src String inputed string * @return String returned string */ public static byte[] base64DecodeToBytes(String src) { sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();

try { return decoder.decodeBuffer(src); } catch (Exception ex) { return null; } }

/** * 对给定字符进行 URL 编码GB2312. * @param src String * @return String */ public static String urlEncode(String src) { return urlEncode(src, "GB2312"); }

/** * 对给定字符进行 URL 解码GB2312 * @param value 解码前的字符串 * @return 解码后的字符串 */ public static String urlDecode(String value) { return urlDecode(value, "GB2312"); }

/** * 对给定字符进行 URL 编码. * @param src String * @param coder 字符编码格式（GB2312/GBK） * @return String */ public static String urlEncode(String src, String coder) { try { src = java.net.URLEncoder.encode(src, coder);

return src; } catch (Exception ex) { ex.printStackTrace(); }

return src; }

/** * 对给定字符进行 URL 解码 * @param value 解码前的字符串 * @param coder 字符编码格式（GB2312/GBK） * @return 解码后的字符串 */ public static String urlDecode(String value, String coder) { try { return java.net.URLDecoder.decode(value, coder); } catch (Exception ex) { ex.printStackTrace(); }

return value; }

/** * 执行给定url * @param urlString 给定的url * @return 返回值 */ public static String executeURL(String urlString) throws Exception { StringBuffer document = new StringBuffer(); URL url = new URL(urlString); URLConnection conn = url.openConnection(); BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));

String line = null; while ((line = reader.readLine()) != null) document.append(line + "/n");

reader.close(); return document.toString(); }}

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