Java微信公众平台开发（1） 接入微信公众平台

package com.cuiyongzhi.wechat.util; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.Arrays;  public class SignUtil {  // 与接口配置信息中的Token要一致  private static String token = "dapengniaowechat";    public static boolean checkSignature(String signature, String timestamp, String nonce) {  String[] arr = new String[] { token, timestamp, nonce };  // 将token、timestamp、nonce三个参数进行字典序排序  Arrays.sort(arr);  StringBuilder content = new StringBuilder();  for (int i = 0; i < arr.length; i++) {  content.append(arr[i]);  }  MessageDigest md = null;  String tmpStr = null;   try {  md = MessageDigest.getInstance("SHA-1");  // 将三个参数字符串拼接成一个字符串进行sha1加密  byte[] digest = md.digest(content.toString().getBytes());  tmpStr = byteToStr(digest);  } catch (NoSuchAlgorithmException e) {  e.printStackTrace();  }   content = null;  // 将sha1加密后的字符串可与signature对比，标识该请求来源于微信  return tmpStr != null ? tmpStr.equals(signature.toUpperCase()) : false;  }     private static String byteToStr(byte[] byteArray) {  String strDigest = "";  for (int i = 0; i < byteArray.length; i++) {  strDigest += byteToHexStr(byteArray[i]);  }  return strDigest;  }     private static String byteToHexStr(byte mByte) {  char[] Digit = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };  char[] tempArr = new char[2];  tempArr[0] = Digit[(mByte >>> 4) & 0X0F];  tempArr[1] = Digit[mByte & 0X0F];  String s = new String(tempArr);  return s;  } }