java获取点击微信自定义菜单的用户openid

测试：

先上 请求类 HttpRequesto

package reyo.sdk.utils.weixin;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.URL;
import java.net.URLConnection;
import java.util.Iterator;
import java.util.Map;

public class HttpRequestor {
	private String charset = "utf-8";
	private Integer connectTimeout = null;
	private Integer socketTimeout = null;
	private String proxyHost = null;
	private Integer proxyPort = null;

	/**
	 * Do GET request
	 * 
	 * @param url
	 * @return
	 * @throws Exception
	 * @throws IOException
	 */
	public String doGet(String url) throws Exception {

		URL localURL = new URL(url);

		URLConnection connection = openConnection(localURL);
		HttpURLConnection httpURLConnection = (HttpURLConnection) connection;

		httpURLConnection.setRequestProperty("Accept-Charset", charset);
		httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

		InputStream inputStream = null;
		InputStreamReader inputStreamReader = null;
		BufferedReader reader = null;
		StringBuffer resultBuffer = new StringBuffer();
		String tempLine = null;

		if (httpURLConnection.getResponseCode() >= 300) {
			throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
		}

		try {
			inputStream = httpURLConnection.getInputStream();
			inputStreamReader = new InputStreamReader(inputStream, "UTF-8");
			reader = new BufferedReader(inputStreamReader);

			while ((tempLine = reader.readLine()) != null) {
				resultBuffer.append(tempLine);
			}

		} finally {

			if (reader != null) {
				reader.close();
			}

			if (inputStreamReader != null) {
				inputStreamReader.close();
			}

			if (inputStream != null) {
				inputStream.close();
			}

		}

		return resultBuffer.toString();
	}

	/**
	 * Do POST request
	 * 
	 * @param url
	 * @param parameterMap
	 * @return
	 * @throws Exception
	 */
	public String doPost(String url, Map<?, ?> parameterMap) throws Exception {

		/* Translate parameter map to parameter date string */
		StringBuffer parameterBuffer = new StringBuffer();
		if (parameterMap != null) {
			Iterator<?> iterator = parameterMap.keySet().iterator();
			String key = null;
			String value = null;
			while (iterator.hasNext()) {
				key = (String) iterator.next();
				if (parameterMap.get(key) != null) {
					value = (String) parameterMap.get(key);
				} else {
					value = "";
				}

				parameterBuffer.append(key).append("=").append(value);
				if (iterator.hasNext()) {
					parameterBuffer.append("&");
				}
			}
		}

		System.out.println("POST parameter : " + parameterBuffer.toString());

		URL localURL = new URL(url);

		URLConnection connection = openConnection(localURL);
		HttpURLConnection httpURLConnection = (HttpURLConnection) connection;

		httpURLConnection.setDoOutput(true);
		httpURLConnection.setRequestMethod("POST");
		httpURLConnection.setRequestProperty("Accept-Charset", charset);
		httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
		httpURLConnection.setRequestProperty("Content-Length", String.valueOf(parameterBuffer.length()));

		OutputStream outputStream = null;
		OutputStreamWriter outputStreamWriter = null;
		InputStream inputStream = null;
		InputStreamReader inputStreamReader = null;
		BufferedReader reader = null;
		StringBuffer resultBuffer = new StringBuffer();
		String tempLine = null;

		try {
			outputStream = httpURLConnection.getOutputStream();
			outputStreamWriter = new OutputStreamWriter(outputStream);

			outputStreamWriter.write(parameterBuffer.toString());
			outputStreamWriter.flush();

			if (httpURLConnection.getResponseCode() >= 300) {
				throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());
			}

			inputStream = httpURLConnection.getInputStream();
			inputStreamReader = new InputStreamReader(inputStream);
			reader = new BufferedReader(inputStreamReader);

			while ((tempLine = reader.readLine()) != null) {
				resultBuffer.append(tempLine);
			}

		} finally {

			if (outputStreamWriter != null) {
				outputStreamWriter.close();
			}

			if (outputStream != null) {
				outputStream.close();
			}

			if (reader != null) {
				reader.close();
			}

			if (inputStreamReader != null) {
				inputStreamReader.close();
			}

			if (inputStream != null) {
				inputStream.close();
			}

		}

		return resultBuffer.toString();
	}

	private URLConnection openConnection(URL localURL) throws IOException {
		URLConnection connection;
		if (proxyHost != null && proxyPort != null) {
			Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort));
			connection = localURL.openConnection(proxy);
		} else {
			connection = localURL.openConnection();
		}
		return connection;
	}

	/*
	 * Getter & Setter
	 */
	public Integer getConnectTimeout() {
		return connectTimeout;
	}

	public void setConnectTimeout(Integer connectTimeout) {
		this.connectTimeout = connectTimeout;
	}

	public Integer getSocketTimeout() {
		return socketTimeout;
	}

	public void setSocketTimeout(Integer socketTimeout) {
		this.socketTimeout = socketTimeout;
	}

	public String getProxyHost() {
		return proxyHost;
	}

	public void setProxyHost(String proxyHost) {
		this.proxyHost = proxyHost;
	}

	public Integer getProxyPort() {
		return proxyPort;
	}

	public void setProxyPort(Integer proxyPort) {
		this.proxyPort = proxyPort;
	}

	public String getCharset() {
		return charset;
	}

	public void setCharset(String charset) {
		this.charset = charset;
	}
}

 直接获取

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        
        String code = request.getParameter("code");
        String appid = "wx4b4009c4fce00e0c";
        String secret = "4d3aea976157935e563f8ef01c7a4293";
        String requestUrl = "https://api.weixin.qq.com/sns/oauth2/access_token?appid="+appid+"&secret="+secret+"&code="+wxCode+"&grant_type=authorization_code";
        //第一次请求 获取access_token 和 openid
        String  oppid = new HttpRequestor().doGet(requestUrl);
        JSONObject oppidObj =JSONObject.fromObject(oppid);
        String access_token = (String) oppidObj.get("access_token");
        String openid = (String) oppidObj.get("openid");
        String requestUrl2 = "https://api.weixin.qq.com/sns/userinfo?access_token="+access_token+"&openid="+openid+"&lang=zh_CN";
        String userInfoStr = new HttpRequestor().doGet(requestUrl2);
        JSONObject wxUserInfo =JSONObject.fromObject(userInfoStr); 
}

然后用微信的地址 跳转https://open.weixin.qq.com/connect/oauth2 /authorize?appid=wx4b4009c4fce00e0c&redirect_uri=这里填写你要跳到请求页面授权域名l& amp;response_type=code&scope=snsapi_base&state=123#wechat_redirect

跳转后会生成一个code  获取code便可以找到用户基本信息