Android腾讯微博开放平台入门（二）随机字符串与签名实现

直接上代码

1、Utils类，包括签名和随机字符串

import java.util.Random;import javax.crypto.Mac;import javax.crypto.spec.SecretKeySpec;/** *  * @author mrlixirong * * 2011-11-16 */public class Utils {//签名public static String getSignature(String baseString,String key){String returnStr="";Mac mac = null;byte[] byteHMAC = null;try {mac = Mac.getInstance("HmacSHA1");SecretKeySpec spec = new SecretKeySpec(key.getBytes(), "HmacSHA1");mac.init(spec);byteHMAC = mac.doFinal(baseString.getBytes());returnStr = Base64Encoder.encode(byteHMAC);//returnStr=URLEncoder.encode(returnStr,ENCODING);} catch (Exception e1) {returnStr="error";e1.printStackTrace();}return returnStr;}/* * 获取随机字符串 * 实现方法很多，也很简单，但是对这种简单的东西，开发者有时候就是不想去敲键盘 * 但是不敲就做不下去，本来在此愿意成全和我一样有此烦恼的开发者 */public static String getRandomString(int len){String returnStr="";char[] ch=new char[len];Random rd=new Random();for(int i=0;i<len;i++){ch[i]=(char)(rd.nextInt(9)+97);}returnStr=new String(ch);return returnStr;}}

2、Base64Encoder

public class Base64Encoder {    private static final char last2byte = (char) Integer.parseInt("00000011", 2);    private static final char last4byte = (char) Integer.parseInt("00001111", 2);    private static final char last6byte = (char) Integer.parseInt("00111111", 2);    private static final char lead6byte = (char) Integer.parseInt("11111100", 2);    private static final char lead4byte = (char) Integer.parseInt("11110000", 2);    private static final char lead2byte = (char) Integer.parseInt("11000000", 2);    private static final char[] encodeTable = new char[]{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};    public static String encode(byte[] from) {        StringBuffer to = new StringBuffer((int) (from.length * 1.34) + 3);        int num = 0;        char currentByte = 0;        for (int i = 0; i < from.length; i++) {            num = num % 8;            while (num < 8) {                switch (num) {                    case 0:                        currentByte = (char) (from[i] & lead6byte);                        currentByte = (char) (currentByte >>> 2);                        break;                    case 2:                        currentByte = (char) (from[i] & last6byte);                        break;                    case 4:                        currentByte = (char) (from[i] & last4byte);                        currentByte = (char) (currentByte << 2);                        if ((i + 1) < from.length) {                            currentByte |= (from[i + 1] & lead2byte) >>> 6;                        }                        break;                    case 6:                        currentByte = (char) (from[i] & last2byte);                        currentByte = (char) (currentByte << 4);                        if ((i + 1) < from.length) {                            currentByte |= (from[i + 1] & lead4byte) >>> 4;                        }                        break;                }                to.append(encodeTable[currentByte]);                num += 6;            }        }        if (to.length() % 4 != 0) {            for (int i = 4 - to.length() % 4; i > 0; i--) {                to.append("=");            }        }        return to.toString();    }}

项目源代码：http://download.csdn.net/detail/mrlixirong/3804385

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