微信接入验证
package weixin;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.weixin.common.SignUtil;
import com.weixin.process.WechatProcess;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
/**
* Servlet implementation class WechatServlet
*/
@WebServlet(“/WechatServlet”)
public class WechatServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public WechatServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding(“UTF-8”);
response.setCharacterEncoding(“UTF-8”);
// 微信加密签名
String signature = request.getParameter(“signature”);
// 时间戮
String timestamp = request.getParameter(“timestamp”);
// 随机数
String nonce = request.getParameter(“nonce”);
// 随机字符串
String echostr = request.getParameter(“echostr”);
/** 读取接收到的xml消息 */
StringBuffer sb = new StringBuffer();
InputStream is = request.getInputStream();
InputStreamReader isr = new InputStreamReader(is, “UTF-8”);
BufferedReader br = new BufferedReader(isr);
String s = “”;
while ((s = br.readLine()) != null) {
sb.append(s);
}
String xml = sb.toString(); //次即为接收到微信端发送过来的xml数据
String result = “”;
/** 判断是否是微信接入激活验证，只有首次接入验证时才会收到echostr参数，此时需要把它直接返回 */
if (SignUtil.checkSignature(signature, timestamp, nonce)) {
result = echostr;
} else {
//正常的微信处理流程
result = new WechatProcess().processWechatMag(xml);
}
try {
OutputStream os = response.getOutputStream();
os.write(result.getBytes(“UTF-8”));
os.flush();
os.close();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO 处理用户请求
}
}
验证帮助类
package com.weixin.common;
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，这里赋予什么值，在接口配置信息中的Token就要填写什么值，
* 两边保持一致即可
*/
private static String token = “weixintest”;
/**
* 验证签名
* @param signature
* @param timestamp
* @param nonce
* @return
*/
public static boolean checkSignature(String signature, String timestamp, String nonce){
String[] arr = new String[]{token, timestamp, nonce};
// 将 token, timestamp, nonce 三个参数进行字典排序
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 shal 加密
byte[] digest = md.digest(content.toString().getBytes());
tmpStr = byteToStr(digest);
} catch (NoSuchAlgorithmException e) {
// TODO Auto-generated catch block
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;
}
/**
* 将字节数组转换为十六进制字符串
* @param digest
* @return
*/
private static String byteToStr(byte[] digest) {
// TODO Auto-generated method stub
String strDigest = “”;
for(int i = 0; i < digest.length; i++){
strDigest += byteToHexStr(digest[i]);
}
return strDigest;
}
/**
* 将字节转换为十六进制字符串
* @param b
* @return
*/
private static String byteToHexStr(byte b) {
// TODO Auto-generated method stub
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[(b >>> 4) & 0X0F];
tempArr[1] = Digit[b & 0X0F];
String s = new String(tempArr);
return s;
}
}
