微信小程序http连接访问解决方案的示例

package DataService;

 

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLConnection;

import java.sql.ResultSet;

 

import com.google.gson.Gson;

 

/*

 * Author:陈浩东

 * QQ:1025584691

 */

public class DouBanBook {

  //豆瓣接口实现

  public static String doPost(String url, String params, Integer connTimeout, Integer readTimeout, String contentType)

  {

    PrintWriter out = null;

    BufferedReader in = null;

    String result = "";

    try

    {

      URL realUrl = new URL(url);

      // 打开和URL之间的连接,根据url

      URLConnection conn = realUrl.openConnection();

      // 设置通用的请求属性

      conn.setRequestProperty("accept", "*/*");

      conn.setRequestProperty("connection", "Keep-Alive");

      conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

      conn.setRequestProperty("Content-Type", contentType == null? "application/json" : contentType);

      // 发送POST请求必须设置如下两行

      conn.setDoOutput(true);

      conn.setDoInput(true);

   

      // 设置请求超时时间和读取超时时间

      conn.setConnectTimeout(connTimeout == null ? 180 : connTimeout);

      conn.setReadTimeout(readTimeout == null ? 180 : readTimeout);

   

      // 获取URLConnection对象对应的输出流，设置utf-8编码

      out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(), "utf-8"));

      // 发送请求参数

      out.print(params);

      // flush输出流的缓冲

      out.flush();

      // 定义BufferedReader输入流来读取URL的响应,设置utf-8编码

      in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "utf-8"));

      String line;

      while ((line = in.readLine()) != null)

        result += line;

    }

    catch (Exception e)

    {

      e.printStackTrace();

      result = null;

    }

    //使用finally块来关闭输出流、输入流

    finally

    {

      try

      {

        if (out != null)

        {

          out.close();

        }

        if (in != null)

        {

          in.close();

        }

      }

      catch (IOException ex)

      {

        ex.printStackTrace();

      }

    }

    return result;

  }

}

package Servlet;

 

import java.io.IOException;

import java.io.Writer;

import java.util.HashMap;

import java.util.Map;

 

import javax.servlet.ServletException;

import javax.servlet.annotation.WebServlet;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

import com.google.gson.Gson;

 

import DataService.DouBanBook;

 

/**

 * Servlet implementation class doubanbook

 */

@WebServlet("/doubanbook")

public class doubanbook extends HttpServlet {

  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

     request.setCharacterEncoding("utf-8");

      response.setContentType("text/html;charset=utf-8");

      response.setHeader("Access-Control-Allow-Origin", "*");

      response.setHeader("Access-Control-Allow-Methods", "GET,POST");

      String isbn = request.getParameter("isbn")==null?"no":request.getParameter("isbn");

      String sshpwd = request.getParameter("ssh_secret")==null?"no":request.getParameter("ssh_secret");

      System.out.println(sshpwd);

      System.out.println(isbn);

      Map<String, Object> result = new HashMap<String, Object>();

      String json = new Gson().toJson(result);

      Writer out = response.getWriter();

      out.write(DouBanBook.doPost("https://api.douban.com/v2/book/isbn/"+isbn, null, null, null, null));

   

      out.flush();

  }

  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    // TODO Auto-generated method stub

    doGet(request, response);

  }

}

const cloud = require('wx-server-sdk')

 

cloud.init()

 

// 云函数入口函数

exports.main = async (event, context) => {

 console.log(event)

 console.log(context)

 

 return new Promise((resolve, reject) => {

 

  var url = event.url;//前端小程序传的data

 

  var https = require('https');

  https.get(url, function (res) {

   var size = 0;

   var chunks = [];

   res.on('data', function (chunk) {

    size += chunk.length;

    chunks.push(chunk);

   });

   res.on('end', function () {

    var data = Buffer.concat(chunks, size).toString();

    console.log(data)

    resolve(JSON.parse(data))

   });

  }).on('error', (e) => {

   console.log(`url:${url} error: ${e.message}`);

  });

 })

}