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【问题解决】HttpURLConnection如何以POST的方式发送请求，传递form表单格式的数据到外部接口

news 来源：原创 2024/9/29 5:32:06

JAVA对接外部接口（无视凭证）

问题点：

给到图片URL，需要将图片先下载下来，然后以流的形式（form表单的数据格式）传给外部接口
对方域名证书过期

package com.jeesite.test;import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import java.security.cert.X509Certificate;public class FileUpload {public static void main(String[] args) {String imgURL = "你的图片地址";String FILE_UPLOAD_URL = "外部接口地址";String token = "请求接口校验的token";try {//处理图片链接获取名字方法工具类，可以忽略String imgName = getImgName(imgURL);// 忽略证书验证（就是这一段）TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager() {public X509Certificate[] getAcceptedIssuers() {return null;}public void checkClientTrusted(X509Certificate[] certs, String authType) {}public void checkServerTrusted(X509Certificate[] certs, String authType) {}}};SSLContext sc = SSLContext.getInstance("SSL");sc.init(null, trustAllCerts, new java.security.SecureRandom());HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());HostnameVerifier allHostsValid = (hostname, session) -> true;HttpsURLConnection.setDefaultHostnameVerifier(allHostsValid);// 请求地址URL url = new URL(FILE_UPLOAD_URL);HttpURLConnection connection = (HttpURLConnection) url.openConnection();connection.setDoOutput(true);connection.setRequestMethod("POST");//这个可要可不要，看自己connection.setRequestProperty("Cookie", "SESSION=MzVhOTJlMzMtZmZjMy00M2Y5LTk1NDAtNDNlMzVjMWVlMTIw");//注意数据格式connection.setRequestProperty("Content-Type", "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW");//用于分隔多个实体（如文件、表单字段等）的标识符（HTTP协议中，不太了解的话自行知识填充）String boundary = "----WebKitFormBoundary7MA4YWxkTrZu0gW";OutputStream outputStream = connection.getOutputStream();// 文件部分outputStream.write(("--" + boundary + "\r\n").getBytes());outputStream.write(("Content-Disposition: form-data; name=\"file\"; filename=\"" + imgName + "\"\r\n").getBytes());outputStream.write(("Content-Type: image/png\r\n\r\n").getBytes());InputStream inputStream = new URL(imgURL).openStream();byte[] buffer = new byte[4096];int bytesRead;while ((bytesRead = inputStream.read(buffer)) != -1) {outputStream.write(buffer, 0, bytesRead);}inputStream.close();outputStream.write(("\r\n").getBytes());// parentId部分outputStream.write(("--" + boundary + "\r\n").getBytes());outputStream.write(("Content-Disposition: form-data; name=\"parentId\"\r\n\r\n").getBytes());outputStream.write(("huanwei\r\n").getBytes());// name部分outputStream.write(("--" + boundary + "\r\n").getBytes());outputStream.write(("Content-Disposition: form-data; name=\"name\"\r\n\r\n").getBytes());outputStream.write((""+imgName+"\r\n").getBytes());// 结束outputStream.write(("--" + boundary + "--\r\n").getBytes());outputStream.flush();outputStream.close();// 读取响应int responseCode = connection.getResponseCode();BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));String inputLine;StringBuilder response = new StringBuilder();while ((inputLine = in.readLine()) != null) {response.append(inputLine);}in.close();JSONObject jsonObject = JSON.parseObject(response.toString());System.out.println(jsonObject);} catch (Exception e) {e.printStackTrace();}}public static String getImgName(String imgURL) {return imgURL.substring(imgURL.lastIndexOf("/") + 1);}
}