模拟浏览器请求get、post

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.net.URLEncoder;
import java.util.Map;

/**

• Created by wcy on 2019/7/12.
  */
  public class IntfUtil {

  /**

  • 调用接口方

  • @param url 对方或第三方提供的路径

  • @param data 向对方或第三方发送的数据，大多数情况下给对方发送JSON数据让对方解析
    */
    public static String interfaceUtilForyw(String data,String url) {
    HttpPost post = new HttpPost(url);
    String result = “”;
    try {
    post.setHeader(“Content-Type”, “application/json”);
    StringEntity entity = new StringEntity(data, “UTF-8”); // 中文乱码在此解决
    entity.setContentType(“application/json”);
    post.setEntity(entity);
    HttpResponse res = HttpClients.createDefault().execute(post);
    if (res.getStatusLine().getStatusCode() == 200) {
    result = EntityUtils.toString(res.getEntity());// 返回json格式：
    }

    } catch (Exception e) {
    e.printStackTrace();
    }
    return result.toString();
    }

    /**

    • 接口调用 GET
      */
      public static String httpURLConectionGET( String GET_URL) {
      StringBuilder sb = new StringBuilder();
      try {
      URL url = new URL(GET_URL); // 把字符串转换为URL请求地址
      HttpURLConnection connection = (HttpURLConnection) url.openConnection();// 打开连接
      connection.connect();// 连接会话
      // 获取输入流
      BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
      String line;

       while ((line = br.readLine()) != null) {// 循环读取流
           sb.append(line);
       }
       br.close();// 关闭流
       connection.disconnect();// 断开连接
       System.out.println(sb.toString());
      

      } catch (Exception e) {
      e.printStackTrace();
      System.out.println(“失败!”);
      }
      return sb.toString();
      }

    /**

    • 接口调用 POST
      */
      public static String sendPost(String url, Map<String, Object> parameters) {

      System.out.println(“请求地址—”+url);

      String result = “”;// 返回的结果
      BufferedReader in = null;// 读取响应输入流
      PrintWriter out = null;
      StringBuffer sb = new StringBuffer();// 处理请求参数
      String params = “”;// 编码之后的参数
      try {
      // 编码请求参数
      if (parameters.size() == 1) {
      for (String name : parameters.keySet()) {
      sb.append(name).append("=").append(java.net.URLEncoder.encode( parameters.get(name)+"", “UTF-8”));
      }
      params = sb.toString();
      } else {
      for (String name : parameters.keySet()) {
      sb.append(name).append("=").append(java.net.URLEncoder.encode(parameters.get(name)+"", “UTF-8”)).append("&");
      }
      String temp_params = sb.toString();
      params = temp_params.substring(0, temp_params.length() - 1);
      }
      // 创建URL对象
      java.net.URL connURL = new java.net.URL(url);
      // 打开URL连接
      java.net.HttpURLConnection httpConn = (java.net.HttpURLConnection) connURL.openConnection();
      // 设置通用属性

       httpConn.setRequestProperty("Charset", "UTF-8");
       httpConn.setRequestProperty("Accept", "*/*");
       httpConn.setRequestProperty("Connection", "Keep-Alive");
       httpConn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1)");
       // 设置POST方式
       httpConn.setDoInput(true);
       httpConn.setDoOutput(true);
       // 获取HttpURLConnection对象对应的输出流
       out = new PrintWriter(httpConn.getOutputStream());
       // 发送请求参数
       out.write(params);
       // flush输出流的缓冲
       out.flush();
       // 定义BufferedReader输入流来读取URL的响应，设置编码方式
       in = new BufferedReader(new InputStreamReader(httpConn.getInputStream(), "UTF-8"));
       String line;
       // 读取返回的内容
       while ((line = in.readLine()) != null) {
           result += line;
       }
      

      } catch (Exception e) {
      e.printStackTrace();
      } finally {
      try {
      if (out != null) {
      out.close();
      }
      if (in != null) {
      in.close();
      }
      } catch (IOException ex) {
      ex.printStackTrace();
      }
      }
      return result;
      }

}