HttpsURLConnection上传文件流

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;