必须的参数：appid和appSecret
①获取code
接口链接示例：
https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxbafc7fdf3664b600&redirect_uri=http%3a%2f%2f0708.pinzhi365.com%2findex_tb.html&response_type=code&scope=snsapi_userinfo&state=STATE&connect_redirect=1#wechat_redirect
参数说明：
appid 服务号自带的值，为固定值
redirect_uri 回调的链接，在经过接口获取到了code之后，页面会跳转到此参数对应的链接上，且域名一定要对应服务号所配置的域 名
且该链接必须要经过urlencode
response_type 固定值
scope 固定值：snsapi_userinfo或snsapi_base(不弹出授权页面，只能获取用户openid)
state 重定向后会带上state参数，开发者可以填写a-zA-Z0-9的参数值，最多128字节
调用结果：
如果用户同意授权，页面将跳转至
http://0708.pinzhi365.com/index_tb.html?code=011bdbf34b5748203155ef831321b9af&state=STATE
------------------------------------------------------------------------------------------------------------
②通过code换取网页access_token
接口链接示例：
https://api.weixin.qq.com/sns/oauth2/access_token?
appid=wxbafc7fdf3664b600&secret=81f9832f79e858b247aa6a2d09d66341&code=011bdbf34b5748203155ef831321b9af&grant_type=authorization_code
参数说明：
appid 同①
secret 服务号自带，即appSecret，为固定值
code 从①获取的值
grant_type 固定值
调用结果：
示例：
{
"access_token": "OezXcEiiBSKSxW0eoylIeByO7M0QcUqqAnU8rzQAkrRdZmwxk9aQoDf5WT5aSvx6wBenI2Jmz_jBs-025_piaJ81bvZrb9Q1oEPOPZq7RMQRZT2sBN3-mk6siHEeXIN9WD1ybSIfoHaITDowh1AN8Q",
"expires_in": 7200,
"refresh_token": "OezXcEiiBSKSxW0eoylIeByO7M0QcUqqAnU8rzQAkrRdZmwxk9aQoDf5WT5aSvx695Vnx345AXlPPDt50Fbl0zfUI5eTGht57oMtwLx_aMyjYF3Juj4AVA_VX0hltk10WL47Z3_v6BnKCD_o9v2S5Q",
"openid": "oAhzJs2lQRR6Dd1U95S1lrlMKjSE",
"scope": "snsapi_userinfo",
"unionid": "o_LdHt0WTwyrk41R2vcAs2v5XFQk"
}
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③通过access_token和openid获取用户信息
接口链接示例：
https://api.weixin.qq.com/sns/userinfo?access_token=OezXcEiiBSKSxW0eoylIeByO7M0QcUqqAnU8rzQAkrRdZmwxk9aQoDf5WT5aSvx6wBenI2Jmz_jBs-025_piaJ81bvZrb9Q1oEPOPZq7RMQRZT2sBN3-mk6siHEeXIN9WD1ybSIfoHaITDowh1AN8Q&openid=oAhzJs2lQRR6Dd1U95S1lrlMKjSE&lang=zh_CN
参数说明：
access_token 由②所获取
openid 由②所获取
lang 语言类型，为固定值
调用结果：
示例：
{
"openid": "oAhzJs2lQRR6Dd1U95S1lrlMKjSE",
"nickname": "雨天发呆",
"sex": 1,
"language": "zh_CN",
"city": "",
"province": "",
"country": "中国",
"headimgurl":
"http://wx.qlogo.cn/mmopen/TTQibyKjrickytMz9ZYicsibWECY84XyItRFZMp5kYv7vVyNxGMCkl1x1L6eOzGIT2ZGhApDx3n0jDfMy3aodO8PXQ/0",
"privilege": [],
"unionid": "o_LdHt0WTwyrk41R2vcAs2v5XFQk"
}
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附：
JAVA发送http get请求的方法：
所必须的jar包：commons-httpclient-3.0.1.jar
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public static String sendGet(String url) {
String newStr = "";
// 构造HttpClient的实例
HttpClient httpClient = new HttpClient();
// 设置 Http 连接超时为3秒
httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(3000);
// 创建GET方法实例
GetMethod getMethod = new GetMethod(url);
// 设置 get 请求超时为 3秒
getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, 3000);
// 使用系统提供的默认的恢复策略
getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,
new DefaultHttpMethodRetryHandler());
try {
// 执行getMethod
int statusCode = httpClient.executeMethod(getMethod);
if (statusCode != HttpStatus.SC_OK) {
System.err.println("Method failed: " + getMethod.getStatusLine());
}
// 读取内容
newStr = new String(getMethod.getResponseBodyAsString().getBytes("ISO8859-1"),"UTF-8").trim();
} catch (HttpException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
// 释放连接
getMethod.releaseConnection();
}
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
System.out.println(newStr);
return newStr;
}
利用json-lib-2.3-jdk15.jar来解析json的方法：
String openIdJson = "
{
"access_token": "OezXcEiiBSKSxW0eoylIeByO7M0QcUqqAnU8rzQAkrRdZmwxk9aQoDf5WT5aSvx6wBenI2Jmz_jBs-025_piaJ81bvZrb9Q1oEPOPZq7RMQRZT2sBN3-mk6siHEeXIN9WD1ybSIfoHaITDowh1AN8Q",
"expires_in": 7200,
"refresh_token": "OezXcEiiBSKSxW0eoylIeByO7M0QcUqqAnU8rzQAkrRdZmwxk9aQoDf5WT5aSvx695Vnx345AXlPPDt50Fbl0zfUI5eTGht57oMtwLx_aMyjYF3Juj4AVA_VX0hltk10WL47Z3_v6BnKCD_o9v2S5Q",
"openid": "oAhzJs2lQRR6Dd1U95S1lrlMKjSE",
"scope": "snsapi_userinfo",
"unionid": "o_LdHt0WTwyrk41R2vcAs2v5XFQk"
}
";
JSONObject jo = JSONObject.fromObject(openIdJson);
String openId = jsonObjectOpenId.getString("openid");