java解析微信小程序的code,微信小程序 获取微信OpenId详解及实例代码

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

流程图如下

主要代码

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 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);

}

获取AuthToken(WXUtil.getAuthToken(code))代码

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

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

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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