Android腾讯微博开发之随机字符串与签名实现

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Android腾讯微博开发之随机字符串与签名实现

2024-07-07 23:00:30 220人阅读

Android腾讯微博开发入门之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();

}

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Android腾讯微博开发之随机字符串与签名实现

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