Android上传图片（PHP服务器）

package com.example.uploadfile.app;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.os.StrictMode;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

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

public class MainActivity extends Activity
{
    private String fileName = "image.jpg";  //报文中的文件名参数
    private String path = Environment.getExternalStorageDirectory().getPath();  //Don‘t use "/sdcard/" here
    private String uploadFile = path + "/" + fileName;    //待上传的文件路径
    private String postUrl = "http://mycloudnote.sinaapp.com/upload.php"; //处理POST请求的页面
    private TextView mText1;
    private TextView mText2;
    private Button mButton;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //"文件路径：\n"+
        mText1 = (TextView) findViewById(R.id.myText1);
        mText1.setText(uploadFile);
        //"上传网址：\n"+
        mText2 = (TextView) findViewById(R.id.myText2);
        mText2.setText(postUrl);
        /* 设置mButton的onClick事件处理 */
        mButton = (Button) findViewById(R.id.myButton);
        mButton.setOnClickListener(new View.OnClickListener()
        {
            public void onClick(View v)
            {
                uploadFile();
            }
        });
    }

    /* 上传文件至Server的方法 */
    private void uploadFile()
    {
        String end = "\r\n";
        String twoHyphens = "--";
        String boundary = "*****";
        try
        {
            URL url = new URL(postUrl);
            HttpURLConnection con = (HttpURLConnection) url.openConnection();
          /* Output to the connection. Default is false,
             set to true because post method must write something to the connection */
            con.setDoOutput(true);
          /* Read from the connection. Default is true.*/
            con.setDoInput(true);
          /* Post cannot use caches */
            con.setUseCaches(false);
          /* Set the post method. Default is GET*/
            con.setRequestMethod("POST");
          /* 设置请求属性 */
            con.setRequestProperty("Connection", "Keep-Alive");
            con.setRequestProperty("Charset", "UTF-8");
            con.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);
          /*设置StrictMode 否则HTTPURLConnection连接失败，因为这是在主进程中进行网络连接*/
            StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());
          /* 设置DataOutputStream，getOutputStream中默认调用connect()*/
            DataOutputStream ds = new DataOutputStream(con.getOutputStream());  //output to the connection
            ds.writeBytes(twoHyphens + boundary + end);
            ds.writeBytes("Content-Disposition: form-data; " +
                    "name=\"file\";filename=\"" +
                    fileName + "\"" + end);
            ds.writeBytes(end);
          /* 取得文件的FileInputStream */
            FileInputStream fStream = new FileInputStream(uploadFile);
          /* 设置每次写入8192bytes */
            int bufferSize = 8192;
            byte[] buffer = new byte[bufferSize];   //8k
            int length = -1;
          /* 从文件读取数据至缓冲区 */
            while ((length = fStream.read(buffer)) != -1)
            {
            /* 将资料写入DataOutputStream中 */
                ds.write(buffer, 0, length);
            }
            ds.writeBytes(end);
            ds.writeBytes(twoHyphens + boundary + twoHyphens + end);
          /* 关闭流，写入的东西自动生成Http正文*/
            fStream.close();
          /* 关闭DataOutputStream */
            ds.close();
          /* 从返回的输入流读取响应信息 */
            InputStream is = con.getInputStream();  //input from the connection 正式建立HTTP连接
            int ch;
            StringBuffer b = new StringBuffer();
            while ((ch = is.read()) != -1)
            {
                b.append((char) ch);
            }
          /* 显示网页响应内容 */
            Toast.makeText(MainActivity.this, b.toString().trim(), Toast.LENGTH_SHORT).show();//Post成功
        } catch (Exception e)
        {
            /* 显示异常信息 */
            Toast.makeText(MainActivity.this, "Fail:" + e, Toast.LENGTH_SHORT).show();//Post失败
        }
    }
}

<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"
    tools:context="${packageName}.${activityClass}">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/myText1"
        android:layout_above="@+id/myText2"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="80dp"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/myText2"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"/>

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Upload"
        android:id="@+id/myButton"
        android:layout_marginTop="80dp"
        android:layout_below="@+id/myText2"
        android:layout_centerHorizontal="true"/>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.uploadfile.app" >

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.uploadfile.app.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
    <uses-sdk android:minSdkVersion="9" android:targetSdkVersion="15" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
</manifest>