牛人的工具包

牛人的工具包

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();
}
}