package com.moucong;import com.alibaba.fastjson.JSONObject;import java.io.*;import java.net.HttpURLConnection;import java.net.MalformedURLException;import java.net.URL;import java.text.ParseException;public class get_post { /** * Created by chengxia on 2018/12/4. */ public String doPost(String URL){ OutputStreamWriter out = null; BufferedReader in = null; StringBuilder result = new StringBuilder(); HttpURLConnection conn = null; try{ URL url = new URL(URL); conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("POST"); //发送POST请求必须设置为true conn.setDoOutput(true); conn.setDoInput(true); //设置连接超时时间和读取超时时间 conn.setConnectTimeout(30000); conn.setReadTimeout(10000); conn.setRequestProperty("Content-Type", "application/json"); conn.setRequestProperty("Accept", "application/json"); //获取输出流 out = new OutputStreamWriter(conn.getOutputStream()); //向post请求发送json数据 String jsonStr = "{\"touser\":\"\", \"msgtype\":\"text\", \"text\":{" + " \"content\":\"\"}}"; out.write(jsonStr); out.flush(); out.close(); //取得输入流，并使用Reader读取 if (200 == conn.getResponseCode()){ in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8")); String line; while ((line = in.readLine()) != null){ result.append(line); System.out.println(line); } }else{ System.out.println("ResponseCode is an error code:" + conn.getResponseCode()); } }catch (Exception e){ e.printStackTrace(); }finally { try{ if(out != null){ out.close(); } if(in != null){ in.close(); } }catch (IOException ioe){ ioe.printStackTrace(); } } return result.toString(); } public String doGet(String URL){ HttpURLConnection conn = null; InputStream is = null; BufferedReader br = null; StringBuilder result = new StringBuilder(); try{ //创建远程url连接对象 URL url = new URL(URL); //通过远程url连接对象打开一个连接，强转成HTTPURLConnection类 conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); //设置连接超时时间和读取超时时间 conn.setConnectTimeout(15000); conn.setReadTimeout(60000); conn.setRequestProperty("Accept", "application/json"); //发送请求 conn.connect(); //通过conn取得输入流，并使用Reader读取 if (200 == conn.getResponseCode()){ is = conn.getInputStream(); br = new BufferedReader(new InputStreamReader(is, "UTF-8")); String line; while ((line = br.readLine()) != null){ result.append(line);// System.out.println(line); } //json类型字符串转为jsonObject// System.out.println(result); JSONObject jsonObject = JSONObject.parseObject(String.valueOf(result)); //根据key值获取数据value System.out.println(jsonObject.getString("access_token")); //输出value1 Writer writer = null; StringBuilder outputString = new StringBuilder(); try { outputString.append(jsonObject.getString("access_token") + "\r\n"); writer = new FileWriter("test.txt"); // true表示追加 writer.write(outputString.toString()); } catch (IOException e) { e.printStackTrace(); } finally { try { writer.close(); } catch (IOException e2) { e2.printStackTrace(); } } }else{ System.out.println("ResponseCode is an error code:" + conn.getResponseCode()); } }catch (MalformedURLException e){ e.printStackTrace(); }catch (IOException e){ e.printStackTrace(); }catch (Exception e){ e.printStackTrace(); }finally { try{ if(br != null){ br.close(); } if(is != null){ is.close(); } }catch (IOException ioe){ ioe.printStackTrace(); } conn.disconnect(); } return result.toString(); } /** 读取文件数据，存入集合中 * @return*/ public static String readtFile(File file) throws IOException, ParseException { InputStreamReader read = null;// 考虑到编码格式 try { read = new InputStreamReader(new FileInputStream(file), "utf-8"); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (FileNotFoundException e) { e.printStackTrace(); } BufferedReader bufferedReader = new BufferedReader(read); String lineTxt = null; StringBuffer buffer = new StringBuffer(); String line = " "; while ((line = bufferedReader.readLine()) != null) {// System.out.println(lineTxt); buffer.append(line); } read.close(); return buffer.toString(); } public static void main(String[] args) throws Exception { get_post http = new get_post();// System.out.println("Testing 1 - Do Http GET request"); //获取token的get方法// http.doGet("https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=&secret="); System.out.println("\nTesting 2 - Do Http POST request"); File file = new File("test.txt"); String token = readtFile(file); System.out.println(token); http.doPost("https://api.weixin.qq.com/cgi-bin/message/custom/send?access_token="+token); } }
来源：https://www.cnblogs.com/setname/p/11964815.html