package com.cuiyongzhi.wechat.util;
 
import java.security.MessageDigest; 
import java.security.NoSuchAlgorithmException; 
import java.util.Arrays; 
 
/**
 * ClassName: SignUtil
 * @Description: 請求校驗工具類 
 * @author dapengniao
 * @date 2016年3月4日 下午6:25:41
 */
public class SignUtil { 
 // 與接口配置信息中的Token要一致 
 private static String token = "dapengniaowechat"; 
 /** 
 * 驗證簽名 
 * @param signature 
 * @param timestamp 
 * @param nonce 
 * @return 
 */ 
 public static boolean checkSignature(String signature, String timestamp, String nonce) { 
 String[] arr = new String[] { token, timestamp, nonce }; 
 // 將token、timestamp、nonce三個參數進行字典序排序 
 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"); 
 // 將三個參數字符串拼接成一個字符串進行sha1加密 
 byte[] digest = md.digest(content.toString().getBytes()); 
 tmpStr = byteToStr(digest); 
 } catch (NoSuchAlgorithmException e) { 
 e.printStackTrace(); 
 } 
 
 content = null; 
 // 將sha1加密后的字符串可與signature對比，標識該請求來源于微信 
 return tmpStr != null ? tmpStr.equals(signature.toUpperCase()) : false; 
 } 
 
 /** 
 * 將字節數組轉換為十六進制字符串 
 * @param byteArray 
 * @return 
 */ 
 private static String byteToStr(byte[] byteArray) { 
 String strDigest = ""; 
 for (int i = 0; i < byteArray.length; i++) { 
 strDigest += byteToHexStr(byteArray[i]); 
 } 
 return strDigest; 
 } 
 
 /** 
 * 將字節轉換為十六進制字符串 
 * @param mByte 
 * @return 
 */ 
 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; 
 } 
}

package com.cuiyongzhi.wechat.controller;
 
import java.io.PrintWriter;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
 
import com.cuiyongzhi.wechat.util.SignUtil;
 
@Controller
@RequestMapping("/wechat")
public class WechatSecurity {
 private static Logger logger = Logger.getLogger(WechatSecurity.class);
 
 /**
 * 
 * @Description: 用于接收get參數，返回驗證參數
 * @param @param request
 * @param @param response
 * @param @param signature
 * @param @param timestamp
 * @param @param nonce
 * @param @param echostr
 * @author dapengniao
 * @date 2016年3月4日 下午6:20:00
 */
 @RequestMapping(value = "security", method = RequestMethod.GET)
 public void doGet(
 HttpServletRequest request,
 HttpServletResponse response,
 @RequestParam(value = "signature", required = true) String signature,
 @RequestParam(value = "timestamp", required = true) String timestamp,
 @RequestParam(value = "nonce", required = true) String nonce,
 @RequestParam(value = "echostr", required = true) String echostr) {
 try {
 if (SignUtil.checkSignature(signature, timestamp, nonce)) {
 PrintWriter out = response.getWriter();
 out.print(echostr);
 out.close();
 } else {
 logger.info("這里存在非法請求！");
 }
 } catch (Exception e) {
 logger.error(e, e);
 }
 }
 
 @RequestMapping(value = "security", method = RequestMethod.POST)
 // post方法用于接收微信服務端消息
 public void DoPost() {
 System.out.println("這是post方法！");
 }
}