獲取微信OpenId
先獲取code
再通過code獲取authtoken，從authtoken中取出openid給前臺
微信端一定不要忘記設定網頁賬號中的授權回調頁面域名
流程圖如下
主要代碼
頁面js代碼
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 | /* 寫cookie
*/function setCookie(name, value) { var Days = 30; var exp = new Date(); exp.setTime(exp.getTime() + Days * 24 * 60 * 60 *
1000); document.cookie = name + "=" + escape(value) +
";expires=" +
exp.toGMTString() + ";path=/";}/* 讀cookie
*/function getCookie(name) { var arr =
document.cookie.match(new RegExp("(^| )" + name + "=([^;]*)(;|$)")); if (arr != null) { return unescape(arr[2]); } return null;}/* 獲取URL參數
*/function getUrlParams(name) { var reg = new RegExp("(^|&)" + name +
"=([^&]*)(&|$)", "i"); var r =
window.location.search.substr(1).match(reg); if (r != null) { return unescape(r[2]); } return null;}/* 獲取openid
*/function getOpenId(url) { var openid =
getCookie("usropenid"); if (openid == null) { openid = getUrlParams('openid'); alert("openid="+openid); if (openid == null) { window.location.href =
"wxcode?url=" +
url; } else { setCookie("usropenid",
openid); } }} |
WxCodeServlet代碼
1 2 3 4 5 6 7 8 9 10 11 12 13 | //訪問微信獲取code@Overrideprotected void
doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String state = req.getParameter("url"); //WxOpenIdServlet的地址 redirect = URLEncoder.encode(redirect, "utf-8"); .append(Configure.APP_ID).append("&redirect_uri=").append(redirect) .append("&response_type=code&scope=snsapi_base&state=").append(state).append("#wechat_redirect"); resp.sendRedirect(url.toString());} |
WxOpenIdServlet代碼
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | //訪問微信獲取openid@Overrideprotected void
doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String code = req.getParameter("code"); String state = req.getParameter("state"); Result ret = new Result(); AuthToken token = WXUtil.getAuthToken(code); if(null !=
token.getOpenid()){ ret.setCode(0); log.info("====openid=="+token.getOpenid()); Map<String,String> map = new HashMap<String,String>(); map.put("openid", token.getOpenid()); map.put("state", state); ret.setData(map); }else{ ret.setCode(-1); ret.setMsg("登錄錯誤"); } String redUrl = state+"?openid="+token.getOpenid(); resp.sendRedirect(redUrl);} |
獲取AuthToken（WXUtil.getAuthToken(code)）代碼
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 | public static
AuthToken getAuthToken(String code){ AuthToken vo = null; try { StringBuffer url = new StringBuffer(uri); url.append("appid=").append(Configure.APP_ID); url.append("&secret=").append(Configure.APP_SECRET); url.append("&code=").append(code); url.append("&grant_type=").append("authorization_code"); HttpURLConnection conn =
HttpClientUtil.CreatePostHttpConnection(url.toString()); InputStream input = null; if (conn.getResponseCode() ==
200) { input =
conn.getInputStream(); } else { input =
conn.getErrorStream(); } vo = JSON.parseObject(new String(HttpClientUtil.readInputStream(input),"utf-8"),AuthToken.class); } catch (Exception e) { log.error("getAuthToken
error", e); } return vo;} |
HttpClientUtil類
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | package
com.huatek.shebao.util;import
java.io.ByteArrayOutputStream;import
java.io.DataOutputStream;import
java.io.IOException;import
java.io.InputStream;import
java.net.HttpURLConnection;import
java.net.MalformedURLException;import
java.net.ProtocolException;import
java.net.URL;public class
HttpClientUtil { // 設置body體 public static void setBodyParameter(String sb,
HttpURLConnection conn) throws IOException
{ DataOutputStream out = new DataOutputStream(conn.getOutputStream()); out.writeBytes(sb); out.flush(); out.close(); } // 添加簽名header public static HttpURLConnection CreatePostHttpConnection(String
uri) throws MalformedURLException, IOException,
ProtocolException { URL url = new URL(uri); HttpURLConnection conn = (HttpURLConnection)
url.openConnection(); conn.setUseCaches(false); conn.setDoInput(true); conn.setDoOutput(true); conn.setRequestMethod("POST"); conn.setInstanceFollowRedirects(true); conn.setConnectTimeout(30000); conn.setReadTimeout(30000); conn.setRequestProperty("Content-Type","application/json"); conn.setRequestProperty("Accept-Charset", "utf-8"); conn.setRequestProperty("contentType", "utf-8"); return conn; } public static byte[] readInputStream(InputStream inStream)
throws Exception { ByteArrayOutputStream outStream = new ByteArrayOutputStream(); byte[] buffer = new byte[1024]; int len = 0; while ((len =
inStream.read(buffer)) != -1) { outStream.write(buffer, 0,
len); } byte[] data = outStream.toByteArray(); outStream.close(); inStream.close(); return data; }} |
封裝AuthToken的VO類
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 | package
com.huatek.shebao.wxpay;public class
AuthToken { private String access_token; private Long expires_in; private String refresh_token; private String openid; private String scope; private String unionid; private Long errcode; private String errmsg; public String getAccess_token() { return access_token; } public void setAccess_token(String access_token) { this.access_token =
access_token; } public Long getExpires_in() { return expires_in; } public void setExpires_in(Long expires_in) { this.expires_in =
expires_in; } public String getRefresh_token() { return refresh_token; } public void setRefresh_token(String refresh_token)
{ this.refresh_token =
refresh_token; } public String getOpenid() { return openid; } public void setOpenid(String openid) { this.openid =
openid; } public String getScope() { return scope; } public void setScope(String scope) { this.scope =
scope; } public String getUnionid() { return unionid; } public void setUnionid(String unionid) { this.unionid =
unionid; } public Long getErrcode() { return errcode; } public void setErrcode(Long errcode) { this.errcode =
errcode; } public String getErrmsg() { return errmsg; } public void setErrmsg(String errmsg) { this.errmsg =
errmsg; }} |