HttpURLConnection上传图片到服务器

package com.bruce.testloadimg;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;

import java.io.ByteArrayOutputStream;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class MainActivity extends AppCompatActivity {
    String url = "http://www.123edu.com/App/head_upload/token/f28414b157a03486719f646593b63e09";

    //Content-Type: multipart/form-data
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);

//
        findViewById(R.id.btn).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new Thread(new Runnable() {
                    @Override
                    public void run() {
                        String content = uploadBitmap1(url, Bitmap2Bytes(bitmap), "userhead");
                        Log.w("tag", content);
                    }
                }).start();

            }
        });
    }

    public byte[] Bitmap2Bytes(Bitmap bm) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
        return baos.toByteArray();
    }

    public String uploadBitmap1(String urlHost, byte[] imageBytes, String key) {
        String endString = "\r\n";
        String twoHyphen = "--";
        String boundary = "*****";
        try {
            URL url = new URL(urlHost);
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
            //con.setRequestProperty("content-type", "text/html");
            //允许input、Output,不使用Cache
            con.setDoInput(true);
            con.setDoOutput(true);
            con.setUseCaches(false);

            //设置传送的method=POST
            con.setRequestMethod("POST");

            //setRequestProperty
            con.setRequestProperty("Connection", "Keep-Alive");
            con.setRequestProperty("Charset", "utf-8");
            con.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);

            //设置DataOutputStream
            DataOutputStream dsDataOutputStream = new DataOutputStream(con.getOutputStream());
            dsDataOutputStream.writeBytes(twoHyphen + boundary + endString);
            dsDataOutputStream.writeBytes("Content-Disposition:form-data;" + "name=\"" + key + "\";filename=\"" +
                    "11.jpg\"" + endString);
            dsDataOutputStream.writeBytes(endString);

            //取得文件的FileInputStream
            dsDataOutputStream.write(imageBytes, 0, imageBytes.length);

            dsDataOutputStream.writeBytes(endString);
            dsDataOutputStream.writeBytes(twoHyphen + boundary + twoHyphen + endString);

            dsDataOutputStream.close();

            int cah = con.getResponseCode();
            if (cah == 200) {
                InputStream isInputStream = con.getInputStream();
                int ch;
                StringBuffer buffer = new StringBuffer();
                while ((ch = isInputStream.read()) != -1) {
                    buffer.append((char) ch);
                }
                return buffer.toString();
            } else {
                return "false";
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return "false";
    }

}