习惯了okhttp和 retrofit的银。回退版本去使用HttpURLConnection，真的感觉凉凉

package com.senseplay.ssp.ota.upload;


import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;

import com.senseplay.mframe.tool.MUtilTool;
import com.senseplay.ssp.http.HttpUrls;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.UUID;


public class UploadTask {

    private final static String BOUNDARY = UUID.randomUUID().toString()
            .toLowerCase().replaceAll("-", "");// 边界标识
    private final static String PREFIX = "--";// 必须存在
    private final static String LINE_END = "\r\n";

    private static final String TAG = "UploadTask";

    public UploadTask() {

    }

    public static String uploadPic(File file, HashMap<String, String> paramsMap) {

        Log.i(TAG, "uploadPic: ------开始上传"+file.length());
        HttpURLConnection conn = null;

        OutputStream os = null;
        BufferedReader br = null;
        String result=null;

        try {

            String httpUrl = "http://192.168.93.113:8044/diary/user/upload";
            URL url = new URL(httpUrl);
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoOutput(true);
            conn.setDoInput(true);
            conn.setUseCaches(false);
            conn.setConnectTimeout(1000 * 10);
            conn.setReadTimeout(1000 * 10);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Accept", "*/*");
            conn.setRequestProperty("Connection", "keep-alive");
            conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
            conn.setRequestProperty("Charset", "UTF-8");
            conn.setRequestProperty("Content-Type", "multipart/form-data; boundary=" + BOUNDARY);
            conn.connect();


            // 往服务器端写内容 也就是发起http请求需要带的参数
            os = new DataOutputStream(conn.getOutputStream());

            // 请求参数部分
//            if (paramsMap != null && paramsMap.size() > 0) {
//                String params = getParams(paramsMap, 1);
//                byte[] postData = params.getBytes();
//                os.write(postData);
//            }


            // 请求参数部分
            writeParams(paramsMap, os);
            Log.i(TAG, "上传文件: **********************************************************************************");
            // 请求上传文件部分
            writeFile(file, os);
            // 请求结束标志
            String endTarget = PREFIX + BOUNDARY + PREFIX + LINE_END;
            os.write(endTarget.getBytes());
            os.flush();

            if (conn.getResponseCode() == 200) {
               result = MUtilTool.streamToString(conn.getInputStream());

                Log.i(TAG, "uploadPic: ----------result:" + result);
            } else {
                Log.e(TAG, "Post Error " + conn.getResponseCode());
            }

            return result;

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (conn != null) {
                    conn.disconnect();
                    conn = null;
                }

                if (os != null) {
                    os.close();
                    os = null;
                }

                if (br != null) {
                    br.close();
                    br = null;
                }
            } catch (IOException ex) {
                ex.printStackTrace();
            }

        }
        return null;

    }


    private static void writeParams(HashMap<String, String> paramsMap, OutputStream os) {
        try{
            String msg = "请求参数部分:\n";
            if (paramsMap == null || paramsMap.isEmpty()) {
                msg += "空";
            } else {
                StringBuilder requestParams = new StringBuilder();
                Set<Map.Entry<String, String>> set = paramsMap.entrySet();
                Iterator<Map.Entry<String, String>> it = set.iterator();
                while (it.hasNext()) {
                    Map.Entry<String, String> entry = it.next();
                    requestParams.append(PREFIX).append(BOUNDARY).append(LINE_END);
                    requestParams.append("Content-Disposition: form-data; name=\"")
                            .append(entry.getKey()).append("\"").append(LINE_END);
                    requestParams.append("Content-Type: text/plain; charset=utf-8")
                            .append(LINE_END);
                    requestParams.append("Content-Transfer-Encoding: 8bit").append(
                            LINE_END);
                    requestParams.append(LINE_END);// 参数头设置完以后需要两个换行，然后才是参数内容
                    requestParams.append(entry.getValue());
                    requestParams.append(LINE_END);
                }
                os.write(requestParams.toString().getBytes());
                os.flush();

                msg += requestParams.toString();
            }

            System.out.println(msg);
        }catch(Exception e){
           e.printStackTrace();

        }


    }


    private static void writeFile(File file, OutputStream os) {
        InputStream is = null;
        StringBuilder requestParams = new StringBuilder();
        try {
            requestParams.append(PREFIX).append(BOUNDARY).append(LINE_END);
//            requestParams.append("Content-Disposition: form-data; name=\"")
//                    .append(file).append("\"; filename=\"")
//                    .append(file.getName()).append("\"")
//                    .append(LINE_END);
            requestParams.append("Content-Disposition: form-data; name=\"file\"")
                    .append("; filename=\"")
                    .append(file.getName()).append("\"")
                    .append(LINE_END);
            requestParams.append("Content-Type: ")
                    .append("image/png")
                    .append(LINE_END);
            requestParams.append("Content-Transfer-Encoding: 8bit").append(
                    LINE_END);
            requestParams.append(LINE_END);// 参数头设置完以后需要两个换行，然后才是参数内容

            System.out.println(requestParams.toString());

            os.write(requestParams.toString().getBytes());

            is = new FileInputStream(file);

            byte[] buffer = new byte[1024 * 1024];
            int len = 0;
            while ((len = is.read(buffer)) != -1) {
                os.write(buffer, 0, len);
            }
            os.write(LINE_END.getBytes());
            os.flush();

        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }


        }

    }

    public static Bitmap getNetBitmap(String url) {

        URL imgUrl = null;
        Bitmap bitmap = null;
        try {
            imgUrl = new URL(url);
            HttpURLConnection conn = (HttpURLConnection) imgUrl
                    .openConnection();
            conn.setDoInput(true);
            conn.connect();
            InputStream is = conn.getInputStream();
            bitmap = BitmapFactory.decodeStream(is);
            is.close();
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return bitmap;
    }
}