HttpsURLConnection上传文件流(实例讲解)_JAVA教程

HttpsURLConnection上传文件流(实例讲解)

2020-11-26 14:44Java教程网 JAVA教程

下面小编就为大家带来一篇HttpsURLConnection上传文件流(实例讲解)。小编觉得挺不错的，现在就分享给大家，也给大家做个参考。一起跟随小编过来看看吧

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;