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微信小程序获取openid

2017-02-24 00:00 381 查看
摘要: 获取微信OpenId

先获取code
再通过code获取authtoken，从authtoken中取出openid给前台
微信端一定不要忘记设定网页账号中的授权回调页面域名



页面js代码

/* 写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=/"
;


}


/* 读cookie */


function
 
getCookie(name) {


var
 
arr = document.cookie.match(
new
 
RegExp(
"(^| )"
 
+ name +
"=([^;]*)(;|$)"
));


if
 
(arr !=
null
) {


return
 
unescape(arr[2]);


}


return
 
null
;


}


/* 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);


}


}


}


WxCodeServlet代码

//访问微信获取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());
}

WxOpenIdServlet代码

//访问微信获取openid


@Override


protected 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(
"登录错误"
);


}


String redUrl = state+
"?openid="
+token.getOpenid();


resp.sendRedirect(redUrl);


}


获取AuthToken（WXUtil.getAuthToken(code)）代码

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public static AuthToken getAuthToken(String code){

AuthToken vo =
null
;

try
 
{

String uri =
"https://api.weixin.qq.com/sns/oauth2/access_token?"
;

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类

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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 {


// 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,0,len);

}

byte[] data = outStream.toByteArray();

outStream.close();

inStream.close();

return
 
data;

}


}

封装AuthToken的VO类

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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;

}

}


                                            

                                        

                        
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                         标签： 
                                                微信小程序
                                                openId
                                                

                        

                    


                

            


            

                
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