功能需求：获取用户openid ,实现微信公众号自动登录.
实现思路：用户访问公众号链接,获取到co
一 获取用户openid
1.调用微信授权接口获取co
weixin_co
appid：公众号基本配置里 开发者ID (AppID)，
redirect_uri：项目接收co
代码如下：
@RequestMapping(value="/loginPhone" )
public String loginPhone(HttpServletRequest request,HttpServletResponse response,
String co
Map<String,Object> open = new HashMap<String,Object>();
try {
String openID= null; //取微信openID
if(request.getSession().getAttribute("openID")== null){
openID = MicroLetterController.queryOpenID(co
}else{
openID = (String) request.getSession().getAttribute("openID");
}
open.put("openID", openID);
UserInfoVO user = null;
user= userInfoService.queryOpenID(open); //通过微信ID查询是否已经绑定
if(user!=null){
//保存用户信息
httpSession.setAttribute(SessionConstants.LOGIN_SESSION_ID, user);
//重定向到查询菜单权限
String WEBPATH = "http://" + request.getHeader("Host") + "" + "/FussenFinanceLoanWeb";
return "redirect:"+WEBPATH+"/menuRole/queryMenuRole";
}
model.addAttribute("openID", openID);
httpSession.setAttribute("openID", openID); //微信ID
} catch (Exception e) {
e.printStackTrace();
}
return "phone/optloan/login/login_phone"; //跳转到登录页面
}
2.用co
weixin_openid.url=https://api.weixin.qq.com/sns/oauth2/access_token?appid=wx039fa5e93cf51b8e&secret=e2fa4c2a05ce99575e6c139a5c37de1c&grant_type=authorization_co
appid：公众号基本配置里 开发者ID (AppID)，
secret：公众号基本配置里 开发者密码 (AppSecret),
co
代码如下：
/**
* 调用微信接口取openID
* @param token
* @param co
* @return
* @throws ParseException
* @throws IOException
* @throws InterruptedException
*/
public static String queryOpenID(String co
String openiD = null;
String url ;
url = PropertiesHandler.getConfigValue("weixin_openid.url").toString();
url =url+co
JSONObject jsonObject = doGetStr(url);
if(jsonObject != null){
if(null!=jsonObject.getString("openid")){
openiD = jsonObject.getString("openid");
}
}
return openiD;
}
get和post方法
/**
* get请求
* @param url
* @return
* @throws ParseException
* @throws IOException
*/
public static JSONObject doGetStr(String url) throws ParseException, IOException{
DefaultHttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
JSONObject jsonObject = null;
HttpResponse httpResponse = client.execute(httpGet);
HttpEntity entity = httpResponse.getEntity();
if(entity != null){
String result = EntityUtils.toString(entity,"UTF-8");
jsonObject = JSONObject.fromObject(result);
}
return jsonObject;
}
/**
* POST请求
* @param url
* @param outStr
* @return
* @throws ParseException
* @throws IOException
*/
public static JSONObject doPostStr(String url,String outStr) throws ParseException, IOException{
DefaultHttpClient client = new DefaultHttpClient();
HttpPost httpost = new HttpPost(url);
JSONObject jsonObject = null;
httpost.setEntity(new StringEntity(outStr,"UTF-8"));
HttpResponse response = client.execute(httpost);
String result = EntityUtils.toString(response.getEntity(),"UTF-8");
jsonObject = JSONObject.fromObject(result);
return jsonObject;
}
到此获取openid结束！！！！！！
流程图 
