java 微信公众号登陆

可以用下面的工具类，现在weixin4j更方便 

String appId = "";
String appSecret = "";
Map access_token_map = GetWxToken.instance().getWxWebToken(appId, appSecret, code);
// 获取微信用户openId
String openid = CommUtil.null2String(access_token_map.get("openid"));
System.out.println("OpenId" + openid);

// 微信网页授权SCOPE分为snsapi_base、snsapi_userinfo，前者是用户无感知的静默授权只能拿到openid；而后者需要用户确认,能拿到更多的用户信息。
String scope = CommUtil.null2String(access_token_map.get("scope"));
System.out.println("scope===================================>" + scope);
// 微信token
String access_token = CommUtil.null2String(access_token_map.get("access_token"));
// 判断用户授予权限
if (scope.equals("snsapi_userinfo")) {
	System.out.println("进入判断用户授权");
	Map params = new HashMap();
	params.put("openid", openid);
	System.out.println("============================================================新增用户");
	Map wxUserInfo = GetWxToken.instance().getWxUserInfo(access_token, openid);//微信用户信息
	//完成之后页面跳转

}

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;

import org.nutz.json.Json;
import org.springframework.stereotype.Component;

@Component
public class GetWxToken {
	private static GetWxToken getAccessToken = new GetWxToken();// 创建单例
	private static String accessToken = "";// 存放token
	private static String jsapi_ticket = "";// 存放jsapi_ticket
	private static Date date = null;// 超时时间
	// 以下为微信商城获取的token信息。
	private static String wx_accessToken = "";// 存放token
	private static Map wx_map;//网页授权map
	private static Map wx_user;//授权微信用户
	private static Date wx_date = null;// 超时时间
	private static Map wx_unionid;//授权微信unionid

	// 获取单例
	public static GetWxToken instance() {
		return getAccessToken;
	}

	public static int null2Int(Object s) {
		int v = 0;
		if (s != null)
			try {
				v = Integer.parseInt(s.toString());
			} catch (Exception e) {
			}
		return v;
	}
	public static Map cal_time_space(Date begin, Date end) {
		SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
		long l = end.getTime() - begin.getTime();
		long day = l / (24 * 60 * 60 * 1000);
		long hour = (l / (60 * 60 * 1000) - day * 24);
		long min = ((l / (60 * 1000)) - day * 24 * 60 - hour * 60);
		long second = (l / 1000 - day * 24 * 60 * 60 - hour * 60 * 60 - min * 60);
		Map map = new HashMap();
		map.put("day", day);
		map.put("hour", hour);
		map.put("min", min);
		map.put("second", second);
		return map;
	}
	public static String null2String(Object s) {
		return s == null ? "" : s.toString().trim();
	}
	
	// 获取微商城accessToken
	public String getWxToken(String appId,String appSecret,HttpServletRequest request) {
		String url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="
				+ appId + "&secret=" + appSecret;
		ServletContext serc = request.getSession().getServletContext();
		
		if(serc.getAttribute("access_token") != null && serc.getAttribute("access_token") !=""){
			if(serc.getAttribute("access_token_date") != null && serc.getAttribute("access_token_date") !=""){
				Date date = (Date) serc.getAttribute("access_token_date");
				Map time_space = cal_time_space(date,new Date());
				
				int a = null2Int(time_space.get("day"))*86400+
			    		null2Int(time_space.get("hour"))*3600+
			    		null2Int(time_space.get("min"))*60+
			    		null2Int(time_space.get("second"));
				if(a > 7200){
					getWxAccessToken(url,request);
				}else{
					this.accessToken = serc.getAttribute("access_token").toString();
				}
			}else{
				getWxAccessToken(url,request);
			}
		}else{
			getWxAccessToken(url,request);
		}
		System.out.println("wx_accessToken----》"+this.accessToken);
		return this.accessToken;
	}
	
	public void getWxAccessToken(String url,HttpServletRequest request){
		ServletContext serc = request.getSession().getServletContext();
		try {
			URL urlGet = new URL(url);
			HttpURLConnection http = (HttpURLConnection) urlGet
					.openConnection();
			http.setRequestMethod("GET"); // 必须是get方式请求
			http.setRequestProperty("Content-Type",
					"application/x-www-form-urlencoded");
			http.setDoOutput(true);
			http.setDoInput(true);
			System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
			System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
			System.setProperty("jsse.enableSNIExtension", "false");
			http.connect();
			InputStream is = http.getInputStream();
			int size = is.available();
			byte[] jsonBytes = new byte[size];
			is.read(jsonBytes);
			String message = new String(jsonBytes, "UTF-8");
			Map map = Json.fromJson(HashMap.class, message);
			String token = null2String(map.get("access_token"));
			is.close();
			if (token != null && !token.equals("")) {
				this.accessToken = token;
				// 设置20分钟后重新获取token
				Calendar cal = Calendar.getInstance();
				//cal.set(Calendar.MINUTE, cal.get(Calendar.MINUTE) + 20);
				this.wx_date = cal.getTime();
			}
			serc.setAttribute("access_token",this.accessToken);
			serc.setAttribute("access_token_date",this.wx_date);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	// 获取微商城网页授权accessToken
	public Map getWxWebToken(String appId,String appSecret,String code) {
		String url = "https://api.weixin.qq.com/sns/oauth2/access_token?"
				+"appid="+appId+"&secret="+appSecret+"&code="+code+"&grant_type=authorization_code";
		try {
			URL urlGet = new URL(url);
			HttpURLConnection http = (HttpURLConnection) urlGet
					.openConnection();
			http.setRequestMethod("GET"); // 必须是get方式请求
			http.setRequestProperty("Content-Type",
					"application/x-www-form-urlencoded");
			http.setDoOutput(true);
			http.setDoInput(true);
			System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
			System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
			System.setProperty("jsse.enableSNIExtension", "false");
			http.connect();
			InputStream is = http.getInputStream();
			int size = is.available();
			byte[] jsonBytes = new byte[size];
			is.read(jsonBytes);
			String message = new String(jsonBytes, "UTF-8");
			this.wx_map = Json.fromJson(HashMap.class, message);
			String token = null2String(this.wx_map.get("access_token"));
			is.close();
			if (token != null && !token.equals("")) {
				this.wx_accessToken = token;
				// 设置20分钟后重新获取token
				Calendar cal = Calendar.getInstance();
				cal.set(Calendar.MINUTE, cal.get(Calendar.MINUTE) + 20);
				this.wx_date = cal.getTime();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return wx_map;
	}
	
	// 获取微信jsapi_ticket
	public String getJsapiToken(String access_token,HttpServletRequest request) {
		String url = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token="+access_token+"&type=jsapi";
		ServletContext serc = request.getSession().getServletContext();
		if(serc.getAttribute("jsapi_ticket") != null && serc.getAttribute("jsapi_ticket") !=""){
			if(serc.getAttribute("jsapi_ticket_date") != null && serc.getAttribute("jsapi_ticket_date") !=""){
				Date date = (Date) serc.getAttribute("jsapi_ticket_date");
				Map time_space =cal_time_space(date,new Date());
				int a = null2Int(time_space.get("day"))*86400+
						null2Int(time_space.get("hour"))*3600+
						null2Int(time_space.get("min"))*60+
						null2Int(time_space.get("second"));
				if(a > 7200){
					getWxJsapiTicket(url,request);
				}else{
					this.jsapi_ticket = serc.getAttribute("jsapi_ticket").toString();
				}
			}else{
				getWxJsapiTicket(url,request);
			}
		}else{
			getWxJsapiTicket(url,request);
		}
		System.out.println("jsapi_ticket----》"+this.jsapi_ticket);
		return this.jsapi_ticket;
	}
	
	public void getWxJsapiTicket(String url,HttpServletRequest request){
		ServletContext serc = request.getSession().getServletContext();
		try {
			URL urlGet = new URL(url);
			HttpURLConnection http = (HttpURLConnection) urlGet
					.openConnection();
			http.setRequestMethod("GET"); // 必须是get方式请求
			http.setRequestProperty("Content-Type",
					"application/x-www-form-urlencoded");
			http.setDoOutput(true);
			http.setDoInput(true);
			System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
			System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
			System.setProperty("jsse.enableSNIExtension", "false");
			http.connect();
			InputStream is = http.getInputStream();
			int size = is.available();
			byte[] jsonBytes = new byte[size];
			is.read(jsonBytes);
			String message = new String(jsonBytes, "UTF-8");
			Map map = Json.fromJson(HashMap.class, message);
			String jsapi_ticket = null2String(map.get("ticket"));
			is.close();
			if (jsapi_ticket != null && !jsapi_ticket.equals("")) {
				this.jsapi_ticket = jsapi_ticket;
				// 设置20分钟后重新获取token
				Calendar cal = Calendar.getInstance();
				cal.set(Calendar.MINUTE, cal.get(Calendar.MINUTE) + 20);
				this.wx_date = cal.getTime();
			}
			serc.setAttribute("jsapi_ticket",this.jsapi_ticket);
			serc.setAttribute("jsapi_ticket_date",this.wx_date);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	// 拉取用户信息
	public Map getWxUserInfo(String access_token,String openid) {
		String url = "https://api.weixin.qq.com/sns/userinfo?"
				+"access_token="+access_token+"&openid="+openid+"&lang=zh_CN";
		try {
			URL urlGet = new URL(url);
			HttpURLConnection http = (HttpURLConnection) urlGet
					.openConnection();
			http.setRequestMethod("GET"); // 必须是get方式请求
			http.setRequestProperty("Content-Type",
					"application/x-www-form-urlencoded");
			http.setDoOutput(true);
			http.setDoInput(true);
			System.setProperty("sun.net.client.defaultConnectTimeout", "30000");// 连接超时30秒
			System.setProperty("sun.net.client.defaultReadTimeout", "30000"); // 读取超时30秒
			System.setProperty("jsse.enableSNIExtension", "false");
			http.connect();
			InputStream is = http.getInputStream();
			int size = is.available();
			byte[] jsonBytes = new byte[size];
			is.read(jsonBytes);
			String message = new String(jsonBytes, "UTF-8");
			this.wx_user = Json.fromJson(HashMap.class, message);
			is.close();
			
		} catch (Exception e) {
			e.printStackTrace();
		}
		return wx_user;
	}
}