微信開發系列（六）_js呼叫微信掃碼
阿新 • • 發佈：2019-02-17
package com.weixin.util;import java.io.IOException;import org.apache.http.HttpEntity;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 com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONObject;public class HttpUtil { private static String access_Token = ""; /** * get請求獲取網址 * @param url * @param charset * @return */ public static String sendGet(String url,String charset){ CloseableHttpClient httpClient=HttpClients.createDefault(); HttpGet get=new HttpGet(url); CloseableHttpResponse response = null; String result=null; try { response=httpClient.execute(get); HttpEntity entity=response.getEntity(); //System.out.println(entity.getContentType().getValue()); result=EntityUtils.toString(entity,charset); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return result; } //獲取tickect public static String getJsTicket(){ JSONObject jsonObject = new JSONObject(); String ticket = ""; if(access_Token ==""){//如果是第一次獲取就直接去請求新的 ticket = getTicket(); }else{//否則就請求舊的 jsonObject = JSON.parseObject(result); String resultCode = jsonObject.getString("errcode"); if(resultCode !="0"){//請求舊的如果不行 ticket = getTicket();//再去請求新的 } else{//如果請求的新的ok ticket = jsonObject.getString("ticket");//直接獲取 } } return ticket; } /** * 獲取最新的ticket * @return */ public static String getTicket(){ JSONObject jsonObject = new JSONObject(); access_Token = WX_Token.getAccessTokenByNet().getAccess_token();//獲取Access_token程式碼就不貼了 String result = sendGet("https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token="+WX_Token.getAccessTokenByNet().getAccess_token()+"&type=jsapi","UTF-8"); jsonObject = JSON.parseObject(result); return jsonObject.getString("ticket"); }}