HttpsURLConnection上传文件流(实例讲解)

项目需要对接外部接口，将图片文件流发送到外部接口，下面代码就是HttpsURLConnection如何上传文件流：

/**
   * HttpsURLConnection上传文件流
   *
   * @param args
   * @throws Exception
   */
  public static void main(String[] args) throws Exception {
    //本地图片
    java.io.File file = new java.io.File("/Users/jikukalun/Pictures/id1.jpg");
    FileInputStream fileInputStream = new FileInputStream(file);
    //对接外部接口
    String urlString = "************";

    URL url = new URL(urlString);
    HttpsURLConnection con = (HttpsURLConnection) url.openConnection();
    // 设置是否向httpUrlConnection输出，因为这个是post请求，参数要放在
    // http正文内，因此需要设为true, 默认情况下是false;
    con.setDoOutput(true);
    // 设置是否从httpUrlConnection读入，默认情况下是true;
    con.setDoInput(true);
    // 设定请求的方法为"POST"，默认是GET
    con.setRequestMethod("POST");
    // Post 请求不能使用缓存
    con.setUseCaches(false);
    // 设定传送的内容类型是可序列化的java对象
    // (如果不设此项,在传送序列化对象时,当WEB服务默认的不是这种类型时可能抛java.io.EOFException)
//    con.setRequestProperty("Content-type", "application/x-java-serialized-object");
    OutputStream out = con.getOutputStream();

    //读取本地图片文件流
    FileInputStream inputStream = new FileInputStream(file);
    byte[] data = new byte[2048];
    int len = 0;
    int sum = 0;
    while ((len = inputStream.read(data)) != -1) {
      //将读取到的本地文件流读取到HttpsURLConnection,进行上传
      out.write(data, 0, len);
      sum = len + sum;
    }

    System.out.println("上传图片大小为:" + sum);

    out.flush();
    inputStream.close();
    out.close();

    int code = con.getResponseCode(); //获取post请求返回状态
    System.out.println("code=" + code + " url=" + url);
    if (code == 200) {
      InputStream inputStream2 = con.getInputStream();
      ByteArrayOutputStream bos = new ByteArrayOutputStream();
      while ((len = inputStream2.read(data)) != -1) {
        bos.write(data, 0, len);
      }
      inputStream2.close();
      String content = bos.toString();
      bos.close();
      System.out.println("result =" + content);
      //将返回的json格式的字符串转化为json对象
      JSONObject json = JSONObject.parseObject(content);
      try {
        System.out.println("name=" + json.getString("name") + ", people=" + json.getString("people") + ", sex=" + json.getString("sex")
            + ", id_number=" + json.getString("id_number") + ", type=" + json.getString("type") + ", address=" + json.getString("address")
            + ", birthday=" + json.getString("birthday"));
      } catch (JSONException e) {
        e.printStackTrace();
      }
    }
    //断开HttpsURLConnection连接
    con.disconnect();
  }

引用jar包：

import com.alibaba.fastjson.JSONException;
import com.alibaba.fastjson.JSONObject;
import javax.net.ssl.HttpsURLConnection;
import java.io.*;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;

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