微信公众号开发常用工具类源码，包含菜单事件，网页授权token获取，openid获取，文件上传工具类源码

package com.chenyun.cloud.utils; import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.ConnectException; import java.net.URL; import java.util.HashMap; import java.util.Map; import javax.net.ssl.HttpsURLConnection; import javax.net.ssl.SSLContext; import javax.net.ssl.SSLSocketFactory; import javax.net.ssl.TrustManager; import org.apache.http.HttpEntity; import org.apache.http.HttpStatus; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.util.EntityUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.util.StringUtils; import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONObject; import com.chenyun.cloud.config.MyX509TrustManager; import com.chenyun.cloud.constant.WeixinConstant; import com.google.gson.Gson; /** * 创建时间：2019年3月19日 下午3:47:54 * 项目名称：chenyun-cloud-hello-service * 类说明： * @author guobinhui * @since JDK 1.8.0_51 */ public class WeiXinUtil { private final static Logger logger= LoggerFactory.getLogger(WeiXinUtil.class); public static JSONObject HttpGet(String URL) { String result = null; JSONObject jsonObj = null; CloseableHttpClient httpclient = HttpClients.createDefault(); CloseableHttpResponse response = null; try { // 创建httpGet. HttpGet httpGet = new HttpGet(URL); // 通过请求对象获取响应对象 response = httpclient.execute(httpGet); // 判断网络连接状态码是否正常(0--200都数正常) if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { HttpEntity entity = response.getEntity();//从HttpResponse中获取结果 if(!StringUtils.isEmpty(entity)){ result = EntityUtils.toString(entity,"utf-8"); logger.info("请求的数据结果为{}",result); jsonObj = JSONObject.parseObject(result);//字符串类型转换为JSON对象 } } } catch (Exception e) { e.printStackTrace(); } finally { try { if (response != null) { response.close(); } httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return jsonObj; } public static Map <String,Object> cacheTokenAndTicket() throws IOException { Gson gson = new Gson(); Map <String,Object> map = new HashMap <String,Object> (); String token = null; String ticket = null; JSONObject tokenObj = null; //需要获取的access_token对象; JSONObject ticketObj = null;//需要获取的jsapi_ticket对象; System.out.println(System.getProperty("user.dir")); String filePath = System.getProperty("user.dir")+"/src/main/resources/static/token.txt"; // String filePath = "C:/application/token.txt"; File file = new File(filePath);//Access_token保存的位置 if (!file.exists()) file.createNewFile(); // 如果文件大小等于0，说明第一次使用，存入Access_token if (file.length() == 0) { tokenObj = WeiXinUtil.getToken(); token = (String)tokenObj.get("access_token"); FileOutputStream fos = new FileOutputStream(filePath, false);// 不允许追加 tokenObj.put("expires_in",System.currentTimeMillis()/1000+""); String json = gson.toJson(tokenObj); fos.write(json.getBytes()); fos.close(); }else { //读取文件内容 @SuppressWarnings("resource") FileInputStream fis = new FileInputStream(file); byte[] b = new byte[2048]; int len = fis.read(b); String jsonAccess_token = new String(b, 0, len);// 读取到的文件内容 JSONObject access_token = gson.fromJson(jsonAccess_token,JSONObject.class); if (access_token.get("expires_in") != null) { String lastSaveTime = (String)access_token.get("expires_in"); long nowTime = System.currentTimeMillis()/1000; long remianTime = nowTime - Long.valueOf(lastSaveTime); if (remianTime < WeixinConstant.EXPIRESIN_TIME) { JSONObject access = gson.fromJson(jsonAccess_token,JSONObject.class); token = (String)access.get("access_token"); } else { tokenObj = WeiXinUtil.getToken(); FileOutputStream fos = new FileOutputStream(file, false);// 不允许追加 tokenObj.put("expires_in",System.currentTimeMillis()/1000+""); String json = gson.toJson(tokenObj); fos.write((json).getBytes()); fos.close(); } } } map.put("access_token",token); map.put("jsapi_ticket",ticket); return map; } /** * 此处通过appid和appaecret获取的公众号调用凭证access_token用于生成js_ticket */ public static JSONObject getToken()throws IOException{ String url = WeixinConstant.GET_ACCESS_TOKEN.replace("APPID",WeixinConstant.APPID).replace("APPSECRET",WeixinConstant.APPSECRET); JSONObject tokenObj = HttpGet(url); return tokenObj; } /** * 此处通过code获取的access_token用于公众号网页授权 */ public static JSONObject getAccessToken(String code) throws IOException{ String host = "http://127.0.0.1:9001/home"; String url = WeixinConstant.ACCESS_TOKEN_URL.replace("APPID",WeixinConstant.APPID).replace("REDIRECT_URI",host).replace("CODE",code); JSONObject AccessToken = HttpGet(url); return AccessToken; } public static JSONObject getJsTicket(String access_token) throws IOException{ String url = WeixinConstant.TICKET_CREATE_URL.replace("ACCESS_TOKEN",access_token); JSONObject ticketObj = HttpGet(url); return ticketObj; } public static void main(String args[]) throws IOException { cacheTokenAndTicket(); } public static JSONObject httpPost(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); // 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 = n