/**
     * 微信获取openId
     */
    @RequestMapping(value="/weiXin", method=RequestMethod.GET)
    public String weiXin(HttpServletRequest request)
    {
        //获取用户openId
        String openId = "";
        
        //用户同意授权，获取返回值code和state
        String code = request.getParameter("code");
        //如果code为空则（请自己实现判断，这里是简写）
        if(code == null){
            return "index";
        }
        
        //获取openid的地址
        String getOpenidUri = "https://api.weixin.qq.com/sns/oauth2/access_token"
                + "?appid=" + AppID
                + "&secret=" + AppSecret
                + "&code=" + code
                + "&grant_type=authorization_code";
        try{
             //发送请求获取返回参数，使用java原生实现，可以使用httpclient或者第三方库实现
               URL getOpenidUrl = new URL(getOpenidUri);
             HttpURLConnection openidConnection = (HttpURLConnection) getOpenidUrl.openConnection(); 
             openidConnection.connect();
             
             BufferedReader openidReader = new BufferedReader(new InputStreamReader(openidConnection.getInputStream())); 
             StringBuffer openidStringBuffer = new StringBuffer();
             String openidLines; 
             while ((openidLines = openidReader.readLine()) != null) { 
                 openidStringBuffer.append(openidLines);
             } 
             openidReader.close(); 
             openidConnection.disconnect(); 
             
             //返回的参数是json格式
               JSONObject openidJson = JSONObject.parseObject(openidStringBuffer.toString());
             if(openidJson.containsKey("openid")){
                 openId = openidJson.getString("openid");
             }
        }catch(Exception e){
            //连接异常，请求异常，或者json返回值异常均需要处理
        }
        
        //需要对openId判空，请自行处理
         System.out.println(openId);
        return "index";
    }

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

//工具类，之后会被调用
public class CheckoutUtil {
    // 与接口配置信息中的Token要一致
    private static String token = "xxxxxxxxxxx";

    /**
     * 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三个参数进行字典序排序
        // Arrays.sort(arr);
        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;
    }

    /**
     * 将字节数组转换为十六进制字符串
     * 
     * @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;
    }

    /**
     * 将字节转换为十六进制字符串
     * 
     * @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;
    }
    public static void sort(String a[]) {
        for (int i = 0; i < a.length - 1; i++) {
            for (int j = i + 1; j < a.length; j++) {
                if (a[j].compareTo(a[i]) < 0) {
                    String temp = a[i];
                    a[i] = a[j];
                    a[j] = temp;
                }
            }
        }
    }
}

@RequestMapping(value="/weixinTest")
    public void weixinTest(HttpServletRequest request) throws Exception{
        boolean isGet = request.getMethod().toLowerCase().equals("get");
        PrintWriter print;
        if (isGet) {
            // 微信加密签名
            String signature = request.getParameter("signature");
            // 时间戳
            String timestamp = request.getParameter("timestamp");
            // 随机数
            String nonce = request.getParameter("nonce");
            // 随机字符串
            String echostr = request.getParameter("echostr");
            // 通过检验signature对请求进行校验，若校验成功则原样返回echostr，表示接入成功，否则接入失败
            if (signature != null && CheckoutUtil.checkSignature(signature, timestamp, nonce)) {
                try {
                    print = response.getWriter();
                    print.write(echostr);
                    print.flush();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

import java.io.InputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class MessageUtil {
    public static Map parseXml(HttpServletRequest request) throws Exception {
        // 将解析结果存储在HashMap中
        Map map = new HashMap();
 
        // 从request中取得输入流
        InputStream inputStream = request.getInputStream();
        
        // 读取输入流
        SAXReader reader = new SAXReader();
        Document document = reader.read(inputStream);
        // 得到xml根元素
        Element root = document.getRootElement();
        // 得到根元素的所有子节点
        List<Element> elementList = root.elements();
 
        // 遍历所有子节点
        for (Element e : elementList)
            map.put(e.getName(), e.getText());
 
        // 释放资源
        inputStream.close();
        inputStream = null;
 
        return map;
    }
}

@RequestMapping(value="/weixinTest")
    public void weixinTest(HttpServletRequest request) throws Exception{
        // 调用parseXml方法解析请求消息
        Map<String, String> requestMap = MessageUtil.parseXml(request);
        // 发送方帐号
        String fromUserName = requestMap.get("FromUserName");
        log.error("----------------------------------------------" + fromUserName);
        // 开发者微信号
        String toUserName = requestMap.get("ToUserName");
        // 消息类型
        String msgType = requestMap.get("MsgType");
        
        if ("event".equals(msgType)){
            log.error("----------------------------------------------" +msgType);
            String Latitude = requestMap.get("Latitude");
            log.error("----------------------------------------------" +Latitude);
            String Longitude = requestMap.get("Longitude");
            log.error("----------------------------------------------" +Longitude);
            
        }
}