Java 微信公众号网页授权

写这篇文章之前简单说下，本人之前也没做过微信这方面的开发，也是属于第一次接触微信公众号开发，写下这篇博客也是为了记录自己的开发内容，也算是给微信公共号开发小白一些借鉴，不喜勿喷。好了 废话不多说 

首先登录微信公众号----点击左侧列表接口权限----网页服务----网页授权（网页授权获取用户基本信息）-----网页授权域名（这个域名一定是备案过的）

上面的操作完成之后

看一下微信网页授权的API 地址为https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140842&token=&lang=zh_CN

仔细看下上面图片中的参数说明

https://open.weixin.qq.com/connect/oauth2/authorize?appid=appid&redirect_uri=回调地址&response_type=code&scope=snsapi_userinfo&state=STATE#wechat_redirect

这个回调的地址就是你的域名/项目名称/你的服务/方法

例如楼主的redirect_uri为http://域名/MountainTourism/wechat/getOpenid （切记这个上面一定要加http://  不能单独写域名 楼主在这吃亏了）

好了以上就是需要设置的地方，因为楼主的业务是需要网页授权之后返回openid,接下来直接上代码

WeChatController.java

/**
 * 
 */
package com.htht.tourism.action;

import java.io.IOException;

import javax.annotation.Resource;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import me.chanjar.weixin.mp.bean.result.WxMpOAuth2AccessToken;
import me.chanjar.weixin.mp.bean.result.WxMpUser;

import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

import com.htht.tourism.domain.Response;
import com.htht.tourism.domain.User;
import com.htht.tourism.domain.link.UserParam;
import com.htht.tourism.intf.TUserService;
import com.htht.tourism.utils.ValidatorResultHandler;
import com.htht.tourism.utils.WeixinHelper;

/**
 * @author wuqiwei
 *
 */
@Controller
@ResponseBody
@RequestMapping("/wechat")
public class WeChatController {
	@Resource
	private TUserService tUserService;
	/**
	 * 获取openid
	 * @author:wuqiwei
	 * @param @param param
	 * @param @param result
	 * @param @return
	 * @throws IOException 
	 * @throws ServletException 
	 * @date:2017年3月27日下午2:35:13
	 */
	@RequestMapping(value = "/getOpenid", method = RequestMethod.GET)
	public ModelAndView add(ModelAndView model,final HttpServletRequest request,final HttpServletResponse response) throws ServletException, IOException {
		WxMpUser wxMpUser =  null;
		try {
			System.out.println(request.getParameter("code"));
			WxMpOAuth2AccessToken wxMpOAuth2AccessToken = WeixinHelper.getWxMpService().oauth2getAccessToken(request.getParameter("code"));
			wxMpUser =  WeixinHelper.getWxMpService().oauth2getUserInfo(wxMpOAuth2AccessToken, null);
		} catch (Exception e) {
			e.printStackTrace();
		}
		//先判断wxMpUser是否为null
//		if (wxMpUser != null) {
////			request.getRequestDispatcher("index.jsp").forward(request,response); //请求转发
////			return Response.getInstance().success("1");
//		}
		ModelAndView mav = new ModelAndView("index");
		mav.addObject("openid", wxMpUser.getOpenId());
		return mav;
	}
}

WeixinHelper.java

package com.htht.tourism.utils;

import java.util.HashMap;
import java.util.Map;

import me.chanjar.weixin.common.bean.WxJsapiSignature;
import me.chanjar.weixin.common.exception.WxErrorException;
import me.chanjar.weixin.mp.api.WxMpInMemoryConfigStorage;
import me.chanjar.weixin.mp.api.WxMpService;
import me.chanjar.weixin.mp.api.impl.WxMpServiceImpl;

/**
 * WeixinHelper
 */
public final class WeixinHelper {
    private WeixinHelper() {
        throw new Error("工具类不能实例化！");
    }

//    private static final String CONFIG_URL = "application.properties";
    public static final String APPID = ConfigUtil.getProperty("WeChat","appid"); // appid
    public static final String APPSECRET =  ConfigUtil.getProperty("WeChat","appsecret"); // appsecret
    public static final String PATERNER_KEY =ConfigUtil.getProperty("WeChat","paternerKey"); // 商户支付密钥
    public static final String MCHI_ID = ConfigUtil.getProperty("WeChat","mch_id"); // 商户号
    public static final String NOTIFY_URL = ConfigUtil.getProperty("WeChat","notify_url");; // 回调地址
    public static final String TRADE_TYPE_JS = ConfigUtil.getProperty("WeChat","trade_type_js"); // 交易类型
    public static final String WEIXIN_OAUTH2 = ConfigUtil.getProperty("WeChat","WEIXIN_OAUTH2"); // 回调地址
    private static WxMpService wxMpService = null;

    /**
     * 获取WxMpService
     */
    public static WxMpService getWxMpService() {
        if (wxMpService == null) {
            WxMpInMemoryConfigStorage config = new WxMpInMemoryConfigStorage();
            config.setAppId(APPID); // 设置微信公众号的appid
            config.setSecret(APPSECRET); // 设置微信公众号的app corpSecret
            // config.setToken("..."); // 设置微信公众号的token
            // config.setAesKey("..."); // 设置微信公众号的EncodingAESKey
            config.setOauth2redirectUri(WEIXIN_OAUTH2);
            wxMpService = new WxMpServiceImpl();
            wxMpService.setWxMpConfigStorage(config);
        }
        return wxMpService;
    }

    /**
     * getShortUrl
     */
    public static String getShortUrl(final String url) {
        String shortUrl = url;
        try {
            shortUrl = getWxMpService().shortUrl(url);
        } catch (WxErrorException e) {
            e.printStackTrace();
        }
        return shortUrl;
    }

    /**
     * getJsapiTicket
     */
    public static String getJsapiTicket() throws WxErrorException {
        return getWxMpService().getJsapiTicket();
    }

    /**
     * createJsapiSignature
     */
    public static WxJsapiSignature createJsapiSignature(final String url) throws WxErrorException {
        return getWxMpService().createJsapiSignature(url);
    }

    /**
     * getJSSDKPayInfo
     */
//    public Map<String, String> getJSSDKPayInfo(final String body, final String totalFee) throws Exception {
//        String outTradeNum = System.currentTimeMillis() + ""; // 商户订单号
//        Map<String, String> paramMap = new HashMap<String, String>();
//        paramMap.put("paternerKey", PATERNER_KEY); //
//        paramMap.put("mch_id", MCHI_ID); //
//        paramMap.put("body", body); // 商品描述
//        paramMap.put("out_trade_no", outTradeNum); // 商户端对应订单号
//        paramMap.put("total_fee", totalFee + "");
//        paramMap.put("spbill_create_ip", SystemHelper.getCurrentUserIp());
//        paramMap.put("notify_url", NOTIFY_URL);
//        paramMap.put("trade_type", TRADE_TYPE_JS);
//        Map<String, String> payInfo = WeixinHelper.getWxMpService().getJSSDKPayInfo(paramMap);
//        return payInfo;
//    }
}

这样就可以获取到openid了 返回到前台
以上就是网页授权获取openid的方法 由于是第一次写这种博客 写的不是很好 请见谅