Android(安卓)上传头像(文件)到服务器

现在很多app都用到了头像的功能，我的项目中也用到了。
头像上传分几步：
1.获取头像
2.剪裁头像
3.文件上传
4.服务器的接受保存
首先第一步，无非就是两种方式
1，拍照
2，相册选择
之前的博客中有现到，不重复，链接：
http://blog.csdn.net/w18756901575/article/details/52087242
http://blog.csdn.net/w18756901575/article/details/52085157
第二步，裁剪头像
这一步我用的时鸿洋大神的东西，是个自定的控件，不过我对其中代码进行了一点点的修改，使之更适合自己的项目，里面原理就是监听onTouchEvent来对缩放，双击事件进行相应的处理，裁剪就是根据大小，创建一个新的bitmap，当然说起来挺简单，如果没有别人的代码可以借鉴参考，估计有的搞了，在此谢谢鸿洋大神，下面是鸿洋大神的博客链接：
http://blog.csdn.net/lmj623565791/article/details/39761281
裁剪图片好像还可以调用Android自带的裁剪功能，不过我没用过，
第三步，上传图片，
上传图片不过也就是上传文件，可以将文件转化为byte数组然后进行base64转码后进行上传，在服务器接收到后，将string解码成byte数组，然后在转化为文件。
当然上传的方法有很多，肯定不止这一种，因为项目的Android和web接口都是我写的所已我就这样写啦…谁让自己的web技术有限呢，原来写Android的时候一直说调用接口接口，原来自己写了才知道，其实就是一个配置好servlet的java文件.⊙﹏⊙||
写接口和写Android差不过嘛，都是用Java写的，本家嘛
对了文件上传的时候如果从本地读取，会需要读取sd卡的权限，我在6.0的模拟器上测试的时候，一直有问题，找了半天才发现是因为，没有申请权限，，，设立的权限不仅仅时AndroidManifest里面的权限声明，在6.0的系统中需要用代码弹出对话框向用户申请..
贴下请求代码

    /**     * 请求权限     */    public void getUserPar() {//        Log.d("测试--授权信息", ContextCompat.checkSelfPermission(this,//                Manifest.permission.WRITE_EXTERNAL_STORAGE) + "");//        Log.d("测试--已授权", PackageManager.PERMISSION_GRANTED + "");//        Log.d("测试--未授权", PackageManager.PERMISSION_DENIED + "");        if (ContextCompat.checkSelfPermission(this,                Manifest.permission.WRITE_EXTERNAL_STORAGE)                == PackageManager.PERMISSION_GRANTED && ContextCompat.checkSelfPermission(this,                Manifest.permission.READ_EXTERNAL_STORAGE)                == PackageManager.PERMISSION_GRANTED) {        } else {            ActivityCompat.requestPermissions(this,                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE},                    1);        }    }    @Override    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {        switch (requestCode) {            case 1: {                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {                    L.d("同意");                } else {                    L.d("拒绝");                }                return;            }        }    }

还有文件和数组相互转化的代码

    /**     * 将file文件转化为byte数组     *     * @param filePath     * @return     */    public static byte[] getBytes(String filePath) {        byte[] buffer = null;        try {            File file = new File(filePath);            FileInputStream fis = new FileInputStream(file);            ByteArrayOutputStream bos = new ByteArrayOutputStream(1000);            byte[] b = new byte[1000];            int n;            while ((n = fis.read(b)) != -1) {                bos.write(b, 0, n);            }            fis.close();            bos.close();            buffer = bos.toByteArray();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return buffer;    }    /**     * 将byte数组转化为file文件     *     * @param bfile     * @param filePath     * @param fileName     */    public static void getFile(byte[] bfile, String filePath, String fileName) {        BufferedOutputStream bos = null;        FileOutputStream fos = null;        File file = null;        try {            File dir = new File(filePath);            if (!dir.exists() && dir.isDirectory()) {// 判断文件目录是否存在                dir.mkdirs();            }            file = new File(filePath + "\\" + fileName);            fos = new FileOutputStream(file);            bos = new BufferedOutputStream(fos);            bos.write(bfile);            bos.flush();        } catch (Exception e) {            e.printStackTrace();        } finally {            if (bos != null) {                try {                    bos.close();                } catch (IOException e1) {                    e1.printStackTrace();                }            }            if (fos != null) {                try {                    fos.close();                } catch (IOException e1) {                    e1.printStackTrace();                }            }        }    }

还有base64转码的：

http://blog.csdn.net/w18756901575/article/details/51073847

嗯，好像只有这些，，没了，，end

对了还有圆角，模糊，图片压缩,,,一起放上去吧

圆形图片效果：

import android.content.Context;import android.content.res.TypedArray;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Paint;import android.graphics.PorterDuff;import android.graphics.PorterDuffXfermode;import android.graphics.RectF;import android.util.AttributeSet;import android.util.TypedValue;import android.widget.ImageView;import com.yesun.league.R;import com.yesun.league.code.utils.DimensUtils;/** * 自定义View，实现圆角，圆形等效果 * * @author zhy */public class CustomImageView extends ImageView {    /**     * TYPE_CIRCLE / TYPE_ROUND     */    private int type;    private static final int TYPE_CIRCLE = 0;    private static final int TYPE_ROUND = 1;    /**     * 图片     */    private Bitmap mSrc;    /**     * 圆角的大小     */    private int mRadius;    /**     * 控件的宽度     */    private int mWidth;    /**     * 控件的高度     */    private int mHeight;    public CustomImageView(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public CustomImageView(Context context) {        this(context, null);    }    /**     * 初始化一些自定义的参数     *     * @param context     * @param attrs     * @param defStyle     */    public CustomImageView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        TypedArray a = context.getTheme().obtainStyledAttributes(attrs,                R.styleable.CustomImageView, defStyle, 0);        int n = a.getIndexCount();        for (int i = 0; i < n; i++) {            int attr = a.getIndex(i);            switch (attr) {                case R.styleable.CustomImageView_src:                    mSrc = BitmapFactory.decodeResource(getResources(),                            a.getResourceId(attr, 0));                    break;                case R.styleable.CustomImageView_type:                    type = a.getInt(attr, 0);// 默认为Circle                    break;                case R.styleable.CustomImageView_borderRadius:                    mRadius = a.getDimensionPixelSize(attr, (int) TypedValue                            .applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10f,                                    getResources().getDisplayMetrics()));// 默认为10DP                    break;            }        }        a.recycle();    }    @Override    public void setImageBitmap(Bitmap bm) {        super.setImageBitmap(bm);        this.mSrc = bm;        postInvalidate();    }    /**     * 计算控件的高度和宽度     */    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        /**         * 设置宽度         */        int specMode = MeasureSpec.getMode(widthMeasureSpec);        int specSize = MeasureSpec.getSize(widthMeasureSpec);        if (specMode == MeasureSpec.EXACTLY)// match_parent , accurate        {            mWidth = specSize;        } else {            // 由图片决定的宽            int desireByImg = getPaddingLeft() + getPaddingRight()                    + mSrc.getWidth();            if (specMode == MeasureSpec.AT_MOST) {//wrap_content                mWidth = Math.min(desireByImg, specSize);            } else                mWidth = desireByImg;        }        /***         * 设置高度         */        specMode = MeasureSpec.getMode(heightMeasureSpec);        specSize = MeasureSpec.getSize(heightMeasureSpec);        if (specMode == MeasureSpec.EXACTLY) {// match_parent , accurate            mHeight = specSize;        } else {            int desire = getPaddingTop() + getPaddingBottom()                    + mSrc.getHeight();            if (specMode == MeasureSpec.AT_MOST) {// wrap_content                mHeight = Math.min(desire, specSize);            } else                mHeight = desire;        }        setMeasuredDimension(mWidth, mHeight);    }    /**     * 绘制     */    @Override    protected void onDraw(Canvas canvas) {        switch (type) {            // 如果是TYPE_CIRCLE绘制圆形            case TYPE_CIRCLE:                int min = Math.min(mWidth, mHeight);                /**                 * 长度如果不一致，按小的值进行压缩                 */                mSrc = Bitmap.createScaledBitmap(mSrc, min, min, false);                canvas.drawBitmap(createCircleImage(mSrc, min), 0, 0, null);                //下面是绘制圆环的，不喜欢的可以不要                Paint paint=new Paint();                int centre = getWidth()/2; //获取圆心的x坐标                int radius = (int) (centre - DimensUtils.dp2px(getContext(),3)/2); //圆环的半径                paint.setColor(0x88ffffff); //设置圆环的颜色                paint.setStyle(Paint.Style.STROKE); //设置空心                paint.setStrokeWidth(DimensUtils.dp2px(getContext(),3)); //设置圆环的宽度                paint.setAntiAlias(true);  //消除锯齿                canvas.drawCircle(centre, centre, radius, paint); //画出圆环                break;            case TYPE_ROUND:                mSrc = Bitmap.createScaledBitmap(mSrc, mWidth, mHeight, false);                canvas.drawBitmap(createRoundConerImage(mSrc), 0, 0, null);                break;        }    }    /**     * 根据原图和变长绘制圆形图片     *     * @param source     * @param min     * @return     */    private Bitmap createCircleImage(Bitmap source, int min) {        final Paint paint = new Paint();        paint.setAntiAlias(true);        Bitmap target = Bitmap.createBitmap(min, min, Config.ARGB_8888);        /**         * 产生一个同样大小的画布         */        Canvas canvas = new Canvas(target);        /**         * 首先绘制圆形         */        canvas.drawCircle(min / 2, min / 2, min / 2, paint);        /**         * 使用SRC_IN，参考上面的说明         */        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));//相交部分取后绘制上去的//        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));//相交部分取        /**         * 绘制图片         */        canvas.drawBitmap(source, 0, 0, paint);        return target;    }    /**     * 根据原图添加圆角     *     * @param source     * @return     */    private Bitmap createRoundConerImage(Bitmap source) {        final Paint paint = new Paint();        paint.setAntiAlias(true);        Bitmap target = Bitmap.createBitmap(mWidth, mHeight, Config.ARGB_8888);        Canvas canvas = new Canvas(target);        RectF rect = new RectF(0, 0, source.getWidth(), source.getHeight());        canvas.drawRoundRect(rect, mRadius, mRadius, paint);        paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SRC_IN));        canvas.drawBitmap(source, 0, 0, paint);        return target;    }}

压缩，模糊都在这个工具类中，自己看吧：

import android.annotation.TargetApi;import android.content.Context;import android.content.res.Resources;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.PixelFormat;import android.graphics.drawable.BitmapDrawable;import android.graphics.drawable.Drawable;import android.os.Build;import android.renderscript.Allocation;import android.renderscript.Element;import android.renderscript.RenderScript;import android.renderscript.ScriptIntrinsicBlur;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.FileInputStream;import java.io.IOException;/** * Created by wkk on 2016/8/23. *  * 工具类 */public class BitmapUtils {    //   compile 'com.yolanda.nohttp:nohttp:1.0.4'    /**     * 从本地读取图片     *     * @param path     * @return     */    public static Bitmap getBitmapForPath(String path) {        try {            FileInputStream in = new FileInputStream(path);            Bitmap bitmap = BitmapFactory.decodeStream(in);            in.close();            return bitmap;        } catch (Exception e) {        }        return null;    }    /**     * 获取资源文件中的图片     *     * @param context     * @param resourcesId     * @return     */    public static Drawable getDrawableFormResources(Context context, int resourcesId) {        Resources resources = context.getResources();        return new BitmapDrawable(resources, BitmapFactory.decodeResource(resources, resourcesId));    }    /**     * 从资源文件中获取bitmap对象     *     * @param context     * @param resourcesId     * @return     */    public static Bitmap getBitmapFromResources(Context context, int resourcesId) {        return BitmapFactory.decodeResource(context.getResources(), resourcesId);    }    /**     * bitmap转byte数组     *     * @param bitmap     * @return     */    public static byte[] getBitmapbyte(Bitmap bitmap) {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        bitmap.compress(Bitmap.CompressFormat.PNG, 100, baos);        byte[] datas = baos.toByteArray();        try {            baos.flush();            baos.close();        } catch (IOException e) {            e.printStackTrace();        }        return datas;    }    /**     * byte转bitmap数组     *     * @param b     * @return     */    public static Bitmap getBitmaoFrombyte(byte[] b) {        return BitmapFactory.decodeByteArray(b, 0, b.length);    }    /**     * 压缩1     *     * @param srcPath     * @return     */    public static Bitmap getimage(String srcPath) {        BitmapFactory.Options newOpts = new BitmapFactory.Options();        //开始读入图片，此时把options.inJustDecodeBounds 设回true了        newOpts.inJustDecodeBounds = true;        Bitmap bitmap = BitmapFactory.decodeFile(srcPath, newOpts);//此时返回bm为空        newOpts.inJustDecodeBounds = false;        int w = newOpts.outWidth;        int h = newOpts.outHeight;        //现在主流手机比较多是800*480分辨率，所以高和宽我们设置为        float hh = 800f;//这里设置高度为800f        float ww = 480f;//这里设置宽度为480f        //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可        int be = 1;//be=1表示不缩放        if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放            be = (int) (newOpts.outWidth / ww);        } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放            be = (int) (newOpts.outHeight / hh);        }        if (be <= 0)            be = 1;        newOpts.inSampleSize = be;//设置缩放比例        //重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了        bitmap = BitmapFactory.decodeFile(srcPath, newOpts);        return compressImage(bitmap);//压缩好比例大小后再进行质量压缩    }    /**     * 压缩2     *     * @param image     * @return     */    public static Bitmap comp(Bitmap image) {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);        if (baos.toByteArray().length / 1024 > 1024) {//判断如果图片大于1M,进行压缩避免在生成图片（BitmapFactory.decodeStream）时溢出            baos.reset();//重置baos即清空baos            image.compress(Bitmap.CompressFormat.JPEG, 50, baos);//这里压缩50%，把压缩后的数据存放到baos中        }        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());        BitmapFactory.Options newOpts = new BitmapFactory.Options();        //开始读入图片，此时把options.inJustDecodeBounds 设回true了        newOpts.inJustDecodeBounds = true;        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);        newOpts.inJustDecodeBounds = false;        int w = newOpts.outWidth;        int h = newOpts.outHeight;        //现在主流手机比较多是800*480分辨率，所以高和宽我们设置为        float hh = 800f;//这里设置高度为800f        float ww = 480f;//这里设置宽度为480f        //缩放比。由于是固定比例缩放，只用高或者宽其中一个数据进行计算即可        int be = 1;//be=1表示不缩放        if (w > h && w > ww) {//如果宽度大的话根据宽度固定大小缩放            be = (int) (newOpts.outWidth / ww);        } else if (w < h && h > hh) {//如果高度高的话根据宽度固定大小缩放            be = (int) (newOpts.outHeight / hh);        }        if (be <= 0)            be = 1;        newOpts.inSampleSize = be;//设置缩放比例        newOpts.inPreferredConfig = Bitmap.Config.RGB_565;//降低图片从ARGB888到RGB565        //重新读入图片，注意此时已经把options.inJustDecodeBounds 设回false了        isBm = new ByteArrayInputStream(baos.toByteArray());        bitmap = BitmapFactory.decodeStream(isBm, null, newOpts);        return compressImage(bitmap);//压缩好比例大小后再进行质量压缩    }    /**     * 质量压缩     *     * @param image     * @return     */    public static Bitmap compressImage(Bitmap image) {        ByteArrayOutputStream baos = new ByteArrayOutputStream();        image.compress(Bitmap.CompressFormat.JPEG, 100, baos);//质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中        int options = 100;        while (baos.toByteArray().length / 1024 > 100) {    //循环判断如果压缩后图片是否大于100kb,大于继续压缩            baos.reset();//重置baos即清空baos            options -= 10;//每次都减少10            image.compress(Bitmap.CompressFormat.JPEG, options, baos);//这里压缩options%，把压缩后的数据存放到baos中        }        ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray());//把压缩后的数据baos存放到ByteArrayInputStream中        Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null);//把ByteArrayInputStream数据生成图片        return bitmap;    }    /**     * 获取图片大小     *     * @param bitmap     * @return     */    public static long getBitmapsize(Bitmap bitmap) {        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1) {            return bitmap.getByteCount();        }        return bitmap.getRowBytes() * bitmap.getHeight();    }    /**     * 对图片进行模糊处理     *     * @param bitmap     * @param context     * @return     */    @TargetApi(Build.VERSION_CODES.JELLY_BEAN_MR1)    public static Bitmap blurBitmap(Bitmap bitmap, Context context) {        Bitmap outBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);        RenderScript rs = RenderScript.create(context.getApplicationContext());        ScriptIntrinsicBlur blurScript = ScriptIntrinsicBlur.create(rs, Element.U8_4(rs));        Allocation allIn = Allocation.createFromBitmap(rs, bitmap);        Allocation allOut = Allocation.createFromBitmap(rs, outBitmap);        blurScript.setRadius(25f);        blurScript.setInput(allIn);        blurScript.forEach(allOut);        allOut.copyTo(outBitmap);        bitmap.recycle();        rs.destroy();        return outBitmap;    }    public static Bitmap drawableToBitmap(Drawable drawable) {        Bitmap bitmap = Bitmap.createBitmap(                drawable.getIntrinsicWidth(),                drawable.getIntrinsicHeight(),                drawable.getOpacity() != PixelFormat.OPAQUE ? Bitmap.Config.ARGB_8888 : Bitmap.Config.RGB_565);        Canvas canvas = new Canvas(bitmap);        //canvas.setBitmap(bitmap);        drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());        drawable.draw(canvas);        return bitmap;    }    /**     * 水平方向模糊度     */    private static float hRadius = 10;    /**     * 竖直方向模糊度     */    private static float vRadius = 10;    /**     * 模糊迭代度     */    private static int iterations = 7;    private static float a = 1.3f;    /**     * 模糊图片     * @param bmp     * @return     */    public static Drawable BoxBlurFilter(Bitmap bmp) {        hRadius = hRadius * a;        vRadius = vRadius * a;        iterations = (int) (iterations * a);        int width = bmp.getWidth();        int height = bmp.getHeight();        int[] inPixels = new int[width * height];        int[] outPixels = new int[width * height];        Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);        bmp.getPixels(inPixels, 0, width, 0, 0, width, height);        for (int i = 0; i < iterations; i++) {            blur(inPixels,                    outPixels, width, height, hRadius);            blur(outPixels,                    inPixels, height, width, vRadius);        }        blurFractional(inPixels,                outPixels, width, height, hRadius);        blurFractional(outPixels,                inPixels, height, width, vRadius);        bitmap.setPixels(inPixels,                0,                width, 0,                0,                width, height);        Drawable drawable = new BitmapDrawable(bitmap);        return drawable;    }    public static void blur(int[] in, int[] out, int width, int height, float radius) {        int widthMinus1 = width - 1;        int r = (int) radius;        int tableSize = 2 * r + 1;        int divide[] = new int[256 * tableSize];        for (int i = 0; i < 256 * tableSize; i++)            divide[i] = i / tableSize;        int inIndex = 0;        for (int y = 0; y < height; y++) {            int outIndex = y;            int ta = 0, tr = 0, tg = 0, tb = 0;            for (int i = -r; i <= r; i++) {                int rgb = in[inIndex + clamp(i, 0, width - 1)];                ta += (rgb >> 24) & 0xff;                tr += (rgb >> 16) & 0xff;                tg += (rgb >> 8) & 0xff;                tb += rgb & 0xff;            }            for (int x = 0; x < width; x++) {                out[outIndex] = (divide[ta] << 24) | (divide[tr] << 16) | (divide[tg] << 8)                        | divide[tb];                int i1 = x + r + 1;                if (i1 > widthMinus1)                    i1 = widthMinus1;                int i2 = x - r;                if (i2 < 0)                    i2 = 0;                int rgb1 = in[inIndex + i1];                int rgb2 = in[inIndex + i2];                ta += ((rgb1 >> 24) & 0xff) - ((rgb2 >> 24) & 0xff);                tr += ((rgb1 & 0xff0000) - (rgb2 & 0xff0000)) >> 16;                tg += ((rgb1 & 0xff00) - (rgb2 & 0xff00)) >> 8;                tb += (rgb1 & 0xff) - (rgb2 & 0xff);                outIndex += height;            }            inIndex += width;        }    }    public static void blurFractional(int[] in, int[] out, int width, int height, float radius) {        radius -= (int) radius;        float f = 1.0f / (1 + 2 * radius);        int inIndex = 0;        for (int y = 0; y < height; y++) {            int outIndex = y;            out[outIndex] = in[0];            outIndex += height;            for (int x = 1; x < width - 1; x++) {                int i = inIndex + x;                int rgb1 = in[i - 1];                int rgb2 = in[i];                int rgb3 = in[i + 1];                int a1 = (rgb1 >> 24)                        & 0xff;                int r1                        = (rgb1 >> 16)                        & 0xff;                int g1                        = (rgb1 >> 8)                        & 0xff;                int b1                        = rgb1 & 0xff;                int a2                        = (rgb2 >> 24)                        & 0xff;                int r2                        = (rgb2 >> 16)                        & 0xff;                int g2                        = (rgb2 >> 8)                        & 0xff;                int b2                        = rgb2 & 0xff;                int a3                        = (rgb3 >> 24)                        & 0xff;                int r3                        = (rgb3 >> 16)                        & 0xff;                int g3                        = (rgb3 >> 8)                        & 0xff;                int b3                        = rgb3 & 0xff;                a1                        = a2 + (int)                        ((a1 + a3) * radius);                r1                        = r2 + (int)                        ((r1 + r3) * radius);                g1                        = g2 + (int)                        ((g1 + g3) * radius);                b1                        = b2 + (int)                        ((b1 + b3) * radius);                a1                        *= f;                r1                        *= f;                g1                        *= f;                b1                        *= f;                out[outIndex]                        = (a1 << 24)                        | (r1 << 16)                        | (g1 << 8)                        | b1;                outIndex                        += height;            }            out[outIndex]                    = in[width - 1];            inIndex                    += width;        }    }    public static int clamp(int x,                            int a,                            int b) {        return (x                < a) ? a : (x > b) ? b : x;    }}

嗯哼，，真的没了，，end

2017/10/12 08:49
关于上传文件到服务器的.两种思路或者是方法.
1.将文件转成base64编码放在字段里面,像正常的http交互一样去访问服务器上传
2.将文件写入流中上传

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