具体处理流程如下图：

此处源码包括：微信企业号的接入及消息的简单处理，在此基础上添加OAuth2的验证实例。
源码下载地址：http://download.csdn.net/detail/rzg813/8015527

具体实现代码：

创建拦截器：OAuth2Interceptor

package org.oms.qiye.interceptor;

import java.io.UnsupportedEncodingException;
import java.lang.reflect.Method;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.web.method.HandlerMethod;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class OAuth2Interceptor implements HandlerInterceptor {

	/**
	 * 在DispatcherServlet完全处理完请求后被调用
	 * 当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion()
	 */
	@Override
	public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
		System.out.println("**执行顺序: 3、afterCompletion**");

	}

	/**
	 * 在业务处理器处理请求执行完成后,生成视图之前执行的动作
	 */
	@Override
	public void postHandle(HttpServletRequest request, HttpServletResponse response, Object arg2, ModelAndView modelAndView) throws Exception {
		System.out.println("**执行顺序: 2、postHandle**");

	}

	/**
	 * 在业务处理器处理请求之前被调用 如果返回false 从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链
	 * 如果返回true 执行下一个拦截器,直到所有的拦截器都执行完毕 再执行被拦截的Controller 然后进入拦截器链,
	 * 从最后一个拦截器往回执行所有的postHandle() 接着再从最后一个拦截器往回执行所有的afterCompletion()
	 */
	@Override
	public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
		System.out.println("**执行顺序: 1、preHandle**");
		String url = request.getRequestURL().toString();

		HttpSession session = request.getSession();
		// 先判断是否有注解

		HandlerMethod handlerMethod = (HandlerMethod) handler;
		Method method = handlerMethod.getMethod();
		OAuthRequired annotation = method.getAnnotation(OAuthRequired.class);
		if (annotation != null) {
			System.out.println("OAuthRequired：你的访问需要获取登录信息！");
			Object objUid = session.getAttribute("UserId");
			if (objUid == null) {
				String resultUrl = request.getRequestURL().toString();
				String param=request.getQueryString();
				if(param!=null){
					resultUrl+= "?" + param;
				}
				System.out.println("resultUrl="+resultUrl);
				try {
					resultUrl = java.net.URLEncoder.encode(resultUrl, "utf-8");
				} catch (UnsupportedEncodingException e) {
					e.printStackTrace();
				}
				//请求的路径
		        String contextPath=request.getContextPath();
				response.sendRedirect(contextPath + "/oauth2.do?resultUrl=" + resultUrl);
				return false;
			}

		}
		return true;
	}

}

package org.oms.qiye.interceptor;

import java.lang.annotation.*;
/**
 * 验证OAuth2注解
 * @author Sunlight
 *
 */
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface OAuthRequired {
	
}

package org.oms.qiye.util;

public class Constants {
	/**
	 * 常量说明：
	 * 此处定义的常量需要持久化，可以保存在数据库中，在需要的地方读取。
	 * 在多企业号中，最好以每个应用来定义。
	 */
	public static final int AGENTID = 1;
	public static final String TOKEN = "sunlight";
	public static final String CORPID = "你的企业号ID";
	public static final String ACCESS_TOKEN = "你的企业号_ACCESS_TOKEN";
	public static final String encodingAESKey = "s8vFF4f6AWay3uAdJh79WD6imaam4BV6Kl4eL4UzgfM";
}

package org.oms.qiye.web;

import java.io.UnsupportedEncodingException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.oms.qiye.pojo.AccessToken;
import org.oms.qiye.util.Constants;
import org.oms.qiye.util.QiYeUtil;
import org.oms.qiye.util.Result;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
/**
 * OAuth2 处理控制器
 * @author Sunlight
 *
 */
@Controller
public class OAuth2Controller {
	/**
	 * 构造参数并将请求重定向到微信API获取登录信息
	 * 
	 * @param index
	 * @return
	 */
	@RequestMapping(value = { "/oauth2.do", "/oauth2" })
	public String Oauth2API(HttpServletRequest request, @RequestParam String resultUrl) {
		// 此处可以添加获取持久化的数据，如企业号id等相关信息
		String CropId = Constants.CORPID;
		String redirectUrl = "";
		if (resultUrl != null) {
			String reqUrl =request.getLocalAddr();
			String backUrl ="http://" + reqUrl + "/oauth2url.do?oauth2url=" + resultUrl;
			System.out.println("backUrl="+backUrl);
			redirectUrl = oAuth2Url(CropId, backUrl);
		}
		return "redirect:" + redirectUrl;
	}

	/**
	 * 根据code获取Userid后跳转到需要带用户信息的最终页面
	 * 
	 * @param request
	 * @param code
	 *            获取微信重定向到自己设置的URL中code参数
	 * @param oauth2url
	 *            跳转到最终页面的地址
	 * @return
	 */
	@RequestMapping(value = { "/oauth2url.do" })
	public String Oauth2MeUrl(HttpServletRequest request, @RequestParam String code, @RequestParam String oauth2url) {
		AccessToken accessToken = QiYeUtil.getAccessToken(Constants.CORPID, Constants.ACCESS_TOKEN);
		HttpSession session = request.getSession();
		if (accessToken != null && accessToken.getToken() != null) {
			String Userid = getMemberGuidByCode(accessToken.getToken(), code, Constants.AGENTID);
			if (Userid != null) {
				session.setAttribute("UserId", Userid);
			}
		}
		// 这里简单处理,存储到session中
		return "redirect:" + oauth2url;
	}

	/**
	 * 构造带员工身份信息的URL
	 * 
	 * @param corpid
	 *            企业id
	 * @param redirect_uri
	 *            授权后重定向的回调链接地址，请使用urlencode对链接进行处理
	 * @param state
	 *            重定向后会带上state参数，企业可以填写a-zA-Z0-9的参数值
	 * @return
	 */
	private String oAuth2Url(String corpid, String redirect_uri) {
		try {
			redirect_uri = java.net.URLEncoder.encode(redirect_uri, "utf-8");
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		String oauth2Url = "https://open.weixin.qq.com/connect/oauth2/authorize?appid=" + corpid + "&redirect_uri=" + redirect_uri
				+ "&response_type=code&scope=snsapi_base&state=sunlight#wechat_redirect";
		System.out.println("oauth2Url=" + oauth2Url);
		return oauth2Url;
	}

	/**
	 * 调用接口获取用户信息
	 * 
	 * @param token
	 * @param code
	 * @param agentId
	 * @return
	 * @throws SQLException
	 * @throws RemoteException
	 */
	public String getMemberGuidByCode(String token, String code, int agentId) {
		System.out.println("code==" + code + "\ntoken=" + token + "\nagentid=" + agentId);
		Result<String> result = QiYeUtil.oAuth2GetUserByCode(token, code, agentId);
		System.out.println("result=" + result);
		if (result.getErrcode() == "0") {
			if (result.getObj() != null) {
				// 此处可以通过微信授权用code还钱的Userid查询自己本地服务器中的数据
				return result.getObj();
			}
		}
		return "";
	}

}

package org.oms.qiye.web;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.oms.qiye.interceptor.OAuthRequired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
/**
 * 需要验证OAuth2控制器
 * @author Sunlight
 *
 */
@Controller
public class UserController {
	/**
	 * 加载个人信息，此处添加了@OAuthRequired注解
	 * @param model
	 * @return
	 */
	@RequestMapping(value={"/userInfo.do"})
	@OAuthRequired
	public String load(HttpServletRequest request,Model model){
		System.out.println("Load a User!");
		HttpSession session = request.getSession();
		model.addAttribute("Userid", session.getAttribute("Userid"));
		return "user";
	}
}

微信企业号调用类 {"errcode":0,"errmsg":"ok"} 此结果表示调用方法成功返回QiYeUtil.class

返回结果处理类Result.class

枚举EnumMethod.class

以上类不在列出，在其他文章已存在！

处理页面user.jsp：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Model And List</title>
</head>
<body>
	<h1>Welcome To SpringMVC! This is OAuth2 UserInfo</h1>
	<h3>获取到的Userid是:${UserId}</h3>
</body>
</html>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xsi:schemaLocation="http://www.springframework.org/schema/beans 
	http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
	http://www.springframework.org/schema/tx 
	http://www.springframework.org/schema/tx/spring-tx-3.2.xsd
	http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.2.xsd
	http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">

	<context:component-scan base-package="org.oms.qiye.web"></context:component-scan>
	<mvc:annotation-driven />

	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/jsp/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>

	<!-- 静态文件处理 -->
	<mvc:resources mapping="/images/**" location="/images/" />
	<mvc:resources mapping="/js/**" location="/js/" />
	<mvc:resources mapping="/css/**" location="/css/" />

	<!-- OAuth2拦截器 -->
	<mvc:interceptors>
		<mvc:interceptor>
			<!-- 对所有的请求拦截使用/** ,对某个模块下的请求拦截使用：/myPath/* -->
			<mvc:mapping path="/**" />
			<ref bean="oauth2Interceptor" />
		</mvc:interceptor>
	</mvc:interceptors>
	<bean id="oauth2Interceptor" class="org.oms.qiye.interceptor.OAuth2Interceptor">
	</bean>
</beans>

服务器测试结果图：


手机微信客户端测试结果图：

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微信企业号OAuth2验证接口实例(使用SpringMVC)