<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

     xmlns:tools="http://schemas.android.com/tools"

     android:layout_width="match_parent"

     android:layout_height="match_parent"

     android:paddingBottom="@dimen/activity_vertical_margin"

     android:paddingLeft="@dimen/activity_horizontal_margin"

     android:paddingRight="@dimen/activity_horizontal_margin"

     android:paddingTop="@dimen/activity_vertical_margin"

     tools:context=".MainActivity" >

     <TextView

         android:id="@+id/textView1"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:textSize="20sp"

         android:text="上传文件" />

     <TextView

         android:id="@+id/textView2"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:layout_below="@+id/textView1"

         android:text="TextView" />

     <Button

         android:id="@+id/button1"

         android:layout_width="wrap_content"

         android:layout_height="wrap_content"

         android:layout_below="@+id/textView2"

         android:text="确定上传" />

 </RelativeLayout>

package com.itcastupfile;

import java.io.BufferedReader;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import android.os.AsyncTask;

import android.os.Bundle;

import android.app.Activity;

import android.app.AlertDialog;

import android.app.ProgressDialog;

import android.content.DialogInterface;

import android.view.Menu;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

import android.widget.Toast;

public class MainActivity extends Activity {

    private String uploadFile = "/mnt/sdcard/DCIM/Camera/IMG_20160406_114143.JPG";

    private String srcPath = "/mnt/sdcard/DCIM/Camera/IMG_20160406_114143.JPG";

    private String actionUrl = "http://10.6.78.90/xampp/sse/index.php/home/Index/upload_file";

    private TextView mText1;

    private TextView mText2;

    private Button mButton;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        mText1 = (TextView)findViewById(R.id.textView1);

        mText1.setText("文件路径：\n"+uploadFile);

        mText2 = (TextView)findViewById(R.id.textView2);

        mText2.setText("上传网址：\n"+actionUrl);

        mButton = (Button)findViewById(R.id.button1);

        mButton.setOnClickListener(new OnClickListener() {

            @Override

            public void onClick(View v) {

                // TODO Auto-generated method stub

                uploadFile(actionUrl);

                //FileUploadTask fileuploadtask = new FileUploadTask();

                //fileuploadtask.execute();

            }

        });

    }

   private  void uploadFile(String actionUrl) {

        // TODO Auto-generated method stub

       String end = "\r\n";

        String twoHyphens = "--";

        String boundary = "******";

       try{

        URL url = new URL(actionUrl);

          HttpURLConnection httpURLConnection = (HttpURLConnection) url

              .openConnection();

          // 设置每次传输的流大小，可以有效防止手机因为内存不足崩溃

          // 此方法用于在预先不知道内容长度时启用没有进行内部缓冲的 HTTP 请求正文的流。

          httpURLConnection.setChunkedStreamingMode(128 * 1024);// 128K

          // 允许输入输出流

          httpURLConnection.setDoInput(true);

          httpURLConnection.setDoOutput(true);

          httpURLConnection.setUseCaches(false);

          // 使用POST方法

          httpURLConnection.setRequestMethod("POST");

          httpURLConnection.setRequestProperty("Connection", "Keep-Alive");

          httpURLConnection.setRequestProperty("Charset", "UTF-8");

          httpURLConnection.setRequestProperty("Content-Type",

              "multipart/form-data;boundary=" + boundary);

          DataOutputStream dos = new DataOutputStream(

              httpURLConnection.getOutputStream());

          dos.writeBytes(twoHyphens + boundary + end);

          dos.writeBytes("Content-Disposition: form-data; name=\"uploadedfile\"; filename=\""

              + srcPath.substring(srcPath.lastIndexOf("/") + 1)

              + "\""

              + end);

          dos.writeBytes(end);

          FileInputStream fis = new FileInputStream(srcPath);

          byte[] buffer = new byte[8192]; // 8k

          int count = 0;

          // 读取文件

          while ((count = fis.read(buffer)) != -1)

          {

            dos.write(buffer, 0, count);

          }

          fis.close();

          dos.writeBytes(end);

          dos.writeBytes(twoHyphens + boundary + twoHyphens + end);

          dos.flush();

          InputStream is = httpURLConnection.getInputStream();

          InputStreamReader isr = new InputStreamReader(is, "utf-8");

          BufferedReader br = new BufferedReader(isr);

          String result = br.readLine();

          Toast.makeText(this, result, Toast.LENGTH_LONG).show();

          dos.close();

          is.close();

        } catch (Exception e)

        {

          e.printStackTrace();

          setTitle(e.getMessage());

        }

      }

    @Override

    public boolean onCreateOptionsMenu(Menu menu) {

        // Inflate the menu; this adds items to the action bar if it is present.

        getMenuInflater().inflate(R.menu.main, menu);

        return true;

    }

}

    <uses-permission android:name="android.permission.INTERNET" />