/ 获取URL参数 /
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;
}

/ 获取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);
}
}
}

获取code @Override protected void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException { String state = req.getParameter("url"); //WxOpenIdServlet的地址 String redirect ="http://"+Configure.SITE+"/wxopenid"; redirect = URLEncoder.encode(redirect,"utf-8"); StringBuffer url = new StringBuffer("https://open.weixin.qq.com/connect/oauth2/authorize?appid=") .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()); }

获取openid @Override protected void doPost(HttpServletRequest req,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 map = new HashMap(); map.put("openid",token.getOpenid()); map.put("state",state); ret.setData(map); }else{ ret.setCode(-1); ret.setMsg("登录错误"); } String redUrl = state+"?openid="+token.getOpenid(); resp.sendRedirect(redUrl); }

SEObject(new String(HttpClientUtil.readInputStream(input),"utf-8"),AuthToken.class); } catch (Exception e) { log.error("getAuthToken error",e); } return vo; }

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 {

// 设置body体
public static void setBodyParameter(String sb,HttpURLConnection conn)
throws IOException {
DataOutputStream out = new DataOutputStream(conn.getOutputStream());
out.writeBytes(sb);
out.flush();
out.close();
}

// 添加签名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,len);
}
byte[] data = outStream.toByteArray();
outStream.close();
inStream.close();
return data;
}

}

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;
}
}