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 {@Resourceprivate 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