java实现微信授权获取用户openid及授权用户相关信息

首先需要在微信公众平台申请账号并在微信公众平台->设置->公众号设置->功能设置中设置或者在平台下接口权限->网页权限->网页授权中设置授权域名。跳转到授权页面的url：https://open.weixin.qq.com/connect/oauth2/authorize?appid=APPID&redirect_uri=REDIRECT_URI&response_type=code&scope=SCOPE&state=STATE#wechat_redirect
需要问自己拼接url,其中redirect_url为授权域名下的连接地址，用于获取code并进行获取openid的后台实现，redirect地址需要进行urlecode，scope中参数：snsapi_base （不弹出授权页面，直接跳转，只能获取用户openid），snsapi_userinfo （弹出授权页面，可通过openid拿到昵称、性别、所在地。并且， 即使在未关注的情况下，只要用户授权，也能获取其信息 ）
跳转页面中的处理代码：

@Namespace("/weixinInfo")
@Results({@Result(name = "ok", location = "/index.jsp"),})
public class GetUserOpenAction extends OutInterfaceAction{
	private static final long serialVersionUID = 1L;
	
	@Action("getCode")
	public String getCode() throws ClientProtocolException, IOException{
	String code =	request.getParameter("code");
	System.out.println(code);
	if (code != null) {
		//获取openid和access_token的连接
		String getOpenIdUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?appid=APPID&secret=APPSECRET&code=CODE&grant_type=authorization_code";
		//获取返回的code
		String requestUrl = getOpenIdUrl.replace("CODE", code);
		HttpClient httpClient = new DefaultHttpClient();
		HttpGet httpGet = new HttpGet(requestUrl);
		ResponseHandler responseHandler = new BasicResponseHandler();
		//向微信发送请求并获取response
		String response = httpClient.execute(httpGet,responseHandler);
		System.out.println("=========================获取token===================");
		System.out.println(response);
		JsonParser parser = new JsonParser();
		JsonObject jsonObject = (JsonObject) parser.parse(response);
		String access_token = jsonObject.get("access_token").getAsString();
		String openId = jsonObject.get("openid").getAsString();
		System.out.println("=======================用户access_token==============");
		System.out.println(access_token);
		System.out.println(openId);
		//获取用户基本信息的连接
		String getUserInfo = "https://api.weixin.qq.com/sns/userinfo?  access_token=ACCESS_TOKEN&openid=OPENID&lang=zh_CN";
		String userInfoUrl = getUserInfo.replace("ACCESS_TOKEN", access_token).replace("OPENID", openId);
		HttpGet httpGetUserInfo = new HttpGet(userInfoUrl);
		String userInfo = httpClient.execute(httpGetUserInfo,responseHandler);
		//微信那边采用的编码方式为ISO8859-1所以需要转化
		String json = new String(userInfo.getBytes("ISO-8859-1"),"UTF-8");
		System.out.println("====================userInfo==============================");
		JsonObject jsonObject1 = (JsonObject) parser.parse(json);
		String nickname = jsonObject1.get("nickname").getAsString();
		String city = jsonObject1.get("city").getAsString();
		String province = jsonObject1.get("province").getAsString();
		String country = jsonObject1.get("country").getAsString();
		String headimgurl = jsonObject1.get("headimgurl").getAsString();
		//性别  1 男  2 女  0 未知
		Integer sex = jsonObject1.get("sex").getAsInt();
		System.out.println("昵称"+nickname);
		System.out.println("城市"+city);
		System.out.println("省"+province);
		System.out.println("国家"+country);
		System.out.println("头像"+headimgurl);
		System.out.println("性别"+sex);
		System.out.println(userInfo);
	}
		return "ok";
	}
	}

后台打印的结果：

由于是测试代码，没有对两次的返回参数进行封装，可以对参数封装进行相应的存储
微信官网的文档：https://mp.weixin.qq.com/wiki?t=resource/res_main&id=mp1421140842