java使用multipart/form-data POST上传文件

最近写微信API的“上传临时素材接口”时，正好遇到该需求，经百度解决完毕后整理发出。

主逻辑参照下链接完成，这已经是一个好用的demo：构建multipart/form-data实现文件上传 - _herbert - 博客园构建multipart/form-data实现文件上传 通常文件上传都是通过form表单中的file控件，并将form中的content-type设置为multipart/form-data。现在我们https://www.cnblogs.com/yfrs/p/uploadbyjavacode.html在此基础上加入https请求的实现。下面内容的请求体格式与上文略有不同，是我参考微信API进行修改后的结果。希望能够帮助到大家。

package com.hstech.util.common;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.net.ssl.*;
import java.io.*;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.security.cert.X509Certificate;
import java.util.UUID;


public class FileUploadUtil {

	private static final Logger log = LoggerFactory.getLogger(FileUploadUtil.class);

	
	public static String postUploadSSL(String url, File file, String fileName) {
		StringBuilder result = new StringBuilder();
		try {
			SSLContext sc = SSLContext.getInstance("SSL");
			sc.init(null, new TrustManager[]{new TrustAnyTrustManager()}, new java.security.SecureRandom());
			URL console = new URL(url);
			HttpsURLConnection conn = (HttpsURLConnection) console.openConnection();
			// 构建请求头
			conn.setRequestMethod("POST");
			conn.setRequestProperty("accept", "*
	private static class TrustAnyTrustManager implements X509TrustManager {
		@Override
		public void checkClientTrusted(X509Certificate[] chain, String authType) {
		}

		@Override
		public void checkServerTrusted(X509Certificate[] chain, String authType) {
		}

		@Override
		public X509Certificate[] getAcceptedIssuers() {
			return new X509Certificate[]{};
		}
	}

	
	private static class TrustAnyHostnameVerifier implements HostnameVerifier {
		@Override
		public boolean verify(String hostname, SSLSession session) {
			return true;
		}
	}
}