FileDownload.java

package iShamrock.Postal.database.photo;

import android.app.ProgressDialog;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Environment;

import java.io.*;
import java.net.HttpURLConnection;
import java.net.URL;

/**
 * Created by zhangqi on 15/2/28.
 */
public class FileDownload extends Thread {
    private final static String TAG = "IcsTestActivity";
    private final static String ALBUM_PATH
            = Environment.getExternalStorageDirectory() + "/download_test/";

    private ProgressDialog mSaveDialog = null;
    private Bitmap mBitmap;
    private String mFileName;
    private String mSaveMessage;
   private String urladdress;
    private String uri;
    private  String fromuser;


    public FileDownload(String name, String url, String fromuser){
        this.mFileName=name;
        this.urladdress=url;
        this.fromuser=fromuser;

    }
    /**
     * Get image from newwork
     * @param path The path of image
     * @return byte[]
     * @throws Exception
     */

    public byte[] getImage(String path) throws Exception{
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(5 * 1000);
        conn.setRequestMethod("GET");
        InputStream inStream = conn.getInputStream();
        if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){
            return readStream(inStream);
        }
        return null;
    }

    /**
     * Get image from newwork
     * @param path The path of image
     * @return InputStream
     * @throws Exception
     */
    public InputStream getImageStream(String path) throws Exception{
        URL url = new URL(path);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setConnectTimeout(5 * 1000);
        conn.setRequestMethod("GET");
        if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){
            return conn.getInputStream();
        }
        return null;
    }
    /**
     * Get data from stream
     * @param inStream
     * @return byte[]
     * @throws Exception
     */
    public static byte[] readStream(InputStream inStream) throws Exception{
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int len = 0;
        while( (len=inStream.read(buffer)) != -1){
            outStream.write(buffer, 0, len);
        }
        outStream.close();
        inStream.close();
        return outStream.toByteArray();
    }

    /**
     * 保存文件
     * @param bm
     * @param fileName
     * @throws java.io.IOException
     */
    public void saveFile(Bitmap bm, String fileName) throws IOException {
        File dirFile = new File(ALBUM_PATH);
        if(!dirFile.exists()){
            dirFile.mkdir();
        }
        dirFile = new File(ALBUM_PATH+fromuser+"/");
        if(!dirFile.exists()){
            dirFile.mkdir();
        }
        File myCaptureFile = new File(ALBUM_PATH +fromuser+"/"+ fileName);
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(myCaptureFile));
        bm.compress(Bitmap.CompressFormat.JPEG, 80, bos);
        bos.flush();
        bos.close();
    }

    private Runnable saveFileRunnable = new Runnable(){
        @Override
        public void run() {
            try {
                saveFile(mBitmap, mFileName);
                mSaveMessage = "图片保存成功！";
            } catch (IOException e) {
                mSaveMessage = "图片保存失败！";
                e.printStackTrace();
            }
        //    messageHandler.sendMessage(messageHandler.obtainMessage());
        }

    };


    /*
     * 连接网络
     * 由于在4.0中不允许在主线程中访问网络，所以需要在子线程中访问
     */

        @Override
        public void run() {
            try {
                String filePath=urladdress;//+mFileName;
                //    String filePath = "http://img.my.csdn.net/uploads/201402/24/1393242467_3999.jpg";


                //以下是取得图片的两种方法
                //////////////// 方法1：取得的是byte数组, 从byte数组生成bitmap
                byte[] data = getImage(filePath);
                if(data!=null){
                    mBitmap = BitmapFactory.decodeByteArray(data, 0, data.length);// bitmap
                }else{
         //           Toast.makeText(IcsTestActivity.this, "Image error!", 1).show();
                }
                ////////////////////////////////////////////////////////

                //******** 方法2：取得的是InputStream，直接从InputStream生成bitmap ***********/
                mBitmap = BitmapFactory.decodeStream(getImageStream(filePath));
                //********************************************************************/

                // 发送消息，通知handler在主线程中更新UI
        //        connectHanlder.sendEmptyMessage(0);
             //   Log.d(TAG, "set image ...");

                saveFile(mBitmap, mFileName);
            } catch (Exception e) {
            //    Toast.makeText(IcsTestActivity.this,"无法链接网络！", 1).show();
                e.printStackTrace();
            }

        }




}