微信公众号(一)获取access_token

1、获取access_token
access_token是公众号的全局唯一接口调用凭据，公众号调用各接口时都需使用access_token。开发者需要进行妥善保存。access_token的存储至少要保留512个字符空间。

package com.wx;

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.ConnectException;
import java.net.URL;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import org.junit.Test;
import com.common.weixin.utils.MyX509TrustManager;
import net.sf.json.JSONObject;

public class wxUtils {

    /**
     * appid、appsecret
     * 在公众号中直接拿到的信息
     */
    String appid ="wx33090a711ff23423";
    String appsecret="7bde1203699c33566800base35fg567";
    /**
     * 获取微信公众号的access_token
     */
    @Test
    public  void getAccessToken() {

        String URL="https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid="+appid
        +"&secret="+appsecret;

        JSONObject jsonObject = httpRequest(URL, "GET", null);  
        try {
            if(jsonObject.getString("errcode")!=null){

            }
        }catch (Exception e) {
        }

         String access_token=jsonObject.getString("access_token");

    }


    public  JSONObject httpRequest(String requestUrl, String requestMethod, String outputStr) {
        JSONObject jsonObject = null;
        StringBuffer buffer = new StringBuffer();
        try {
            // 创建SSLContext对象，并使用我们指定的信任管理器初始化
            TrustManager[] tm = { new MyX509TrustManager() };
            SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
            sslContext.init(null, tm, new java.security.SecureRandom());
            // 从上述SSLContext对象中得到SSLSocketFactory对象
            SSLSocketFactory ssf = sslContext.getSocketFactory();

            URL url = new URL(requestUrl);
            HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();
            httpUrlConn.setSSLSocketFactory(ssf);

            httpUrlConn.setDoOutput(true);
            httpUrlConn.setDoInput(true);
            httpUrlConn.setUseCaches(false);
            // 设置请求方式（GET/POST）
            httpUrlConn.setRequestMethod(requestMethod);

            if ("GET".equalsIgnoreCase(requestMethod))
                httpUrlConn.connect();

            // 当有数据需要提交时
            if (null != outputStr) {
                OutputStream outputStream = httpUrlConn.getOutputStream();
                // 注意编码格式，防止中文乱码
                outputStream.write(outputStr.getBytes("UTF-8"));
                outputStream.close();
            }

            // 将返回的输入流转换成字符串
            InputStream inputStream = httpUrlConn.getInputStream();
            InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
            BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

            String str = null;
            while ((str = bufferedReader.readLine()) != null) {
                buffer.append(str);
            }
            bufferedReader.close();
            inputStreamReader.close();
            // 释放资源
            inputStream.close();
            inputStream = null;
            httpUrlConn.disconnect();
            jsonObject = JSONObject.fromObject(buffer.toString());
        } catch (ConnectException ce) {
        } catch (Exception e) {
        }
        return jsonObject;
    }

}






package com.common.weixin.utils;

import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
mport javax.net.ssl.X509TrustManager;
/**
 * 微信请求--信息管理器
 * @author m
 *
 */
public class MyX509TrustManager implements X509TrustManager{

    public MyX509TrustManager() {
        // TODO Auto-generated constructor stub
    }
      @Override
        public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }
        @Override
        public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
        }
        @Override
        public X509Certificate[] getAcceptedIssuers() {
        //        return new X509Certificate[0];
            return  null;
        }

}

maven依赖

<dependency>      
            <groupId>net.sf.json-lib</groupId>     
            <artifactId>json-lib</artifactId>      
            <version>2.4</version>  
             <classifier>jdk15</classifier>        
        </dependency>   
        <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.11</version>
        </dependency>