<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
</dependency>
<dependency>
	 <groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

public class AccessToken {
private String access_token;//获取到的凭证
private int expires_in;//凭证有效时间
public String getAccess_token() {
return access_token;
}
public void setAccess_token(String access_token) {
this.access_token = access_token;
}
public int getExpires_in() {
return expires_in;
}
public void setExpires_in(int expires_in) {
this.expires_in = expires_in;
}
}	

2.3 添加redis缓存处理

import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
public final
class RedisUtil {
//Redis服务器IP
private static String ADDR = "127.0.0.1";
//Redis的端口号
private static int PORT = 6379;
//访问密码
private static String AUTH = "123456";
//可用连接实例的最大数目，默认值为8；
//如果赋值为-1，则表示不限制；如果pool已经分配了maxActive个jedis实例，则此时pool的状态为exhausted(耗尽)。
private static int MAX_ACTIVE = 1024;
//控制一个pool最多有多少个状态为idle(空闲的)的jedis实例，默认值也是8。
private static int MAX_IDLE = 200;
//等待可用连接的最大时间，单位毫秒，默认值为-1，表示永不超时。如果超过等待时间，则直接抛出JedisConnectionException；
private static int MAX_WAIT = 10000;
private static int TIMEOUT = 10000;
//在borrow一个jedis实例时，是否提前进行validate操作；如果为true，则得到的jedis实例均是可用的；
private static boolean TEST_ON_BORROW = true;
private static JedisPool jedisPool = null;
/**
* 初始化Redis连接池
*/
static {
try {
JedisPoolConfig config = new JedisPoolConfig();
config.setMaxTotal(MAX_ACTIVE);
config.setMaxIdle(MAX_IDLE);
config.setMaxWaitMillis(MAX_WAIT);
config.setTestOnBorrow(TEST_ON_BORROW);
jedisPool = new JedisPool(config, ADDR, PORT, TIMEOUT);//如果你的redis设置了密码，在创建时添加AUTH参数
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 获取Jedis实例
* @return
*/
public synchronized static Jedis getJedis() {
try {
if (jedisPool != null) {
Jedis resource = jedisPool.getResource();
return resource;
} else {
return null;
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 释放jedis资源
* @param jedis
*/
@SuppressWarnings("deprecation")
public static void returnResource(final Jedis jedis) {
if (jedis != null) {
jedisPool.returnResource(jedis);
}
}
}

2.4 处理调用接口post与get请求，获取access_token

package com.yuanjun.weixindemo.util;
import java.io.IOException;
import net.sf.json.JSONObject;
import org.apache.http.HttpEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import redis.clients.jedis.Jedis;
import com.yuanjun.weixindemo.bean.AccessToken;
import com.yuanjun.weixindemo.redis.RedisUtil;
/**
*
* 类名称: WeiXinUtil
* 类描述:
* @author yuanjun
* 创建时间:2017年12月8日下午4:38:42
*/
public class WeiXinUtil {
/**
* 开发者id
*/
private static final String APPID = "换成你自己的appid";
/**
* 开发者秘钥
*/
private static final String APPSECRET="开发秘钥";
private static final String ACCESS_TOKEN_URL = "https://api.weixin.qq.com/cgi-bin/token?"
+ "grant_type=client_credential&appid=APPID&secret=APPSECRET";
/**
* 处理doget请求
* @param url
* @return
*/
public static JSONObject doGetstr(String url){
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet(url);
JSONObject jsonObject = null;
try {
CloseableHttpResponse response = httpclient.execute(httpGet);
HttpEntity entity = response.getEntity();
if(entity!=null){
String result = EntityUtils.toString(entity);
jsonObject = JSONObject.fromObject(result);
}
} catch (IOException e) {
e.printStackTrace();
}
return jsonObject;
}
/**
* 处理post请求
* @param url
* @return
*/
public static JSONObject doPoststr(String url,String outStr){
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpPost httpPost = new HttpPost(url);
JSONObject jsonObject = null;
try {
httpPost.setEntity(new StringEntity(outStr, "utf-8"));
CloseableHttpResponse response = httpclient.execute(httpPost);
String result = EntityUtils.toString(response.getEntity(),"utf-8");
jsonObject =JSONObject.fromObject(result);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return jsonObject;
}
public static AccessToken getAccessToken(){
System.out.println("从接口中获取");
Jedis jedis
= RedisUtil.getJedis();
AccessToken token = new AccessToken();
String url = ACCESS_TOKEN_URL.replace("APPID", APPID).replace("APPSECRET", APPSECRET);
JSONObject json = doGetstr(url);
if(json!=null){
token.setAccess_token(json.getString("access_token"));
token.setExpires_in(json.getInt("expires_in"));
jedis.set("access_token", json.getString("access_token"));
jedis.expire("access_token", 60*60*2);
}
RedisUtil.returnResource(jedis);
return token;
}
/**
* 获取凭证
* @return
*/
public static String
getAccess_Token(){
System.out.println("从缓存中读取");
Jedis jedis
= RedisUtil.getJedis();
String access_token = jedis.get("access_token");
if(access_token==null){
AccessToken token = getAccessToken();
access_token = token.getAccess_token();
}
RedisUtil.returnResource(jedis);
return access_token;
}
}

import com.yuanjun.weixindemo.util.WeiXinUtil;
public class Test {
public static void main(String[] args) {
String access_token = WeiXinUtil.getAccess_Token();
System.out.println("调用成功access_token:"+access_token);
}
}