java中token的生成和验证

package com.zjn.token;
/**
 * token编码工具类
 * @author ouyangjun
 */
public class TokenEncryptUtils {
	// 编码密码,可自定义
		private static final String ENCODED_PASSWORD = "ouyangjun";

		/**
		 * 编码
		 * @param str
		 * @return
		 */
		public static String encoded(String str) {
			return strToHex(encodedString(str, ENCODED_PASSWORD));
		}

		/**
		 * 转换
		 * @param str
		 * @param password
		 * @return
		 */
		private static String encodedString(String str, String password) {
			char[] pwd = password.toCharArray();
			int pwdLen = pwd.length;

	        char[] strArray = str.toCharArray();
	        for (int i=0; i<strArray.length; i++) {
	        	strArray[i] = (char)(strArray[i] ^ pwd[i%pwdLen] ^ pwdLen);
	        }
	        return new String(strArray);
		}

		private static String strToHex(String s) {
			return bytesToHexStr(s.getBytes());
		}

		private static String bytesToHexStr(byte[] bytesArray) {
			StringBuilder builder = new StringBuilder();
			String hexStr;
			for (byte bt : bytesArray) {
				hexStr = Integer.toHexString(bt & 0xFF);
				if (hexStr.length() == 1) {
					builder.append("0");
					builder.append(hexStr);
				}else{
					builder.append(hexStr);
				}
			}
			return builder.toString();
		}

		/**
		 * 解码
		 * @param str
		 * @return
		 */
		public static String decoded(String str) {
			String hexStr = null;
			try {
				hexStr = hexStrToStr(str);
			} catch (Exception e) {
				e.printStackTrace();
			}
			if (hexStr != null) {
				hexStr = encodedString(hexStr, ENCODED_PASSWORD);
			}
			return hexStr;
		}

		private static String hexStrToStr(String hexStr) {
			return new String(hexStrToBytes(hexStr));
		}

		private static byte[] hexStrToBytes(String hexStr) {
			String hex;
			int val;
			byte[] btHexStr = new byte[hexStr.length()/2];
			for (int i=0; i<btHexStr.length; i++) {
				hex = hexStr.substring(2*i, 2*i+2);
				val = Integer.valueOf(hex, 16);
				btHexStr[i] = (byte) val;
			}
			return btHexStr;
		}

}

　　

package com.zjn.token;

import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

/**
 * token生成和校验
 * @author ouyangjun
 */
public class TokenUtilsmm {
	private static Map<String,String> MAP_TOKENS = new HashMap<String,String>();
	private static final int VALID_TIME = 60*60*2; // token有效期(秒)
	public static final String TOKEN_ERROR = "F"; // 非法
	public static final String TOKEN_OVERDUE = "G"; // 过期
	public static final String TOKEN_FAILURE = "S"; // 失效

	/**
	 * 生成token,该token长度不一致,如需一致,可自行MD5或者其它方式加密一下
	 * 该方式的token只存在磁盘上,如果项目是分布式,最好用redis存储
	 * @param str: 该字符串可自定义,在校验token时要保持一致
	 * @return
	 */
	public static String getToken(String str) {
		String token = TokenEncryptUtils.encoded(getCurrentTime()+","+str);
		MAP_TOKENS.put(str, token);
		return token;
	}

	/**
	 * 校验token的有效性
	 * @param token
	 * @return
	 */
	public static String checkToken(String token) {
		if (token == null) {
			return TOKEN_ERROR;
		}
		try{
			String[] tArr = TokenEncryptUtils.decoded(token).split(",");
			if (tArr.length != 2) {
				return TOKEN_ERROR;
			}
			// token生成时间戳
			int tokenTime = Integer.parseInt(tArr[0]);
			// 当前时间戳
			int currentTime = getCurrentTime();
			if (currentTime-tokenTime < VALID_TIME) {
				String tokenStr = tArr[1];
				String mToken = MAP_TOKENS.get(tokenStr);
				if (mToken == null) {
					return TOKEN_OVERDUE;
				} else if(!mToken.equals(token)) {
					return TOKEN_FAILURE;
				}
				return tokenStr;
			} else {
				return TOKEN_OVERDUE;
			}
		}catch (Exception e) {
			e.printStackTrace();
		}
		return TOKEN_ERROR;
	}

	/**获取当前时间戳（10位整数）*/
	public static int getCurrentTime() {
		return (int)(System.currentTimeMillis()/1000);
	}

	/**
	 * 移除过期的token
	 */
	public static void removeInvalidToken() {
		int currentTime = getCurrentTime();
		for (Entry<String,String> entry : MAP_TOKENS.entrySet()) {
			String[] tArr = TokenEncryptUtils.decoded(entry.getValue()).split(",");
			int tokenTime = Integer.parseInt(tArr[0]);
			if(currentTime-tokenTime > VALID_TIME){
				MAP_TOKENS.remove(entry.getKey());
			}
		}
	}

	/**
	 * 测试
	 * @param args
	 */
	public static void main(String[] args) {
		String str = "username_and_password";

		// 获取token
		String token = TokenUtilsmm.getToken(str);
		System.out.println("token Result: " + token);

		// 校验token
		String checkToken = TokenUtilsmm.checkToken(token);
		System.out.println("checkToken Result: " + checkToken);
		if(str.equals(checkToken)) {
			System.out.println("==>token verification succeeded!");
		}

	}

}