获取Assets目录下的图片显示并上传

  1 package com.jingle.getlocal;

  2 

  3 import java.io.ByteArrayOutputStream;

  4 

  5 import java.io.InputStream;

  6 

  7 import org.apache.http.Header;

  8 

  9 import sun.misc.BASE64Encoder;

 10 

 11 import com.loopj.android.http.AsyncHttpClient;

 12 import com.loopj.android.http.AsyncHttpResponseHandler;

 13 import com.loopj.android.http.RequestParams;

 14 

 15 

 16 import android.app.Activity;

 17 import android.content.res.AssetManager;

 18 import android.graphics.Bitmap;

 19 import android.graphics.BitmapFactory;

 20 

 21 import android.os.Bundle;

 22 import android.util.Log;

 23 import android.view.View;

 24 import android.view.View.OnClickListener;

 25 import android.widget.Button;

 26 import android.widget.ImageView;

 27 

 28 public class MainActivity extends Activity {

 29     private String UPLOAD_URL = "http://192.168.1.101:8080/Login//servlet/UploadImg";

 30 

 31     @Override

 32     protected void onCreate(Bundle savedInstanceState) {

 33         super.onCreate(savedInstanceState);

 34         setContentView(R.layout.activity_main);

 35 

 36         initImg();

 37         initBtnUploadImg();

 38 

 39     }

 40 

 41     private void initBtnUploadImg() {

 42         Button btn = (Button) findViewById(R.id.btn);

 43         btn.setOnClickListener(new OnClickListener() {

 44 

 45             public void onClick(View v) {

 46                 uploadImg();

 47             }

 48         });

 49     }

 50 

 51     private void uploadImg() {

 52         AsyncHttpClient client = new AsyncHttpClient();

 53         client.setTimeout(3000);

 54         RequestParams params = new RequestParams();

 55         //获取Bitmap对象

 56         Bitmap bmp = getImg("orca.jpg");

 57         //获取字节数组输出流

 58         ByteArrayOutputStream baos = new ByteArrayOutputStream();

 59         //压缩Bitmap对象到字节数组输出流

 60         bmp.compress(Bitmap.CompressFormat.JPEG, 90, baos);

 61         //将字节数组输出流转为字节数组

 62         byte[] ba = baos.toByteArray();

 63         //将字节数组编码成字符串

 64         String str = new BASE64Encoder().encode(ba);

 65         params.put("img", str);

 66 

 67         client.post(UPLOAD_URL, params, new AsyncHttpResponseHandler() {

 68             public void onSuccess(int arg0, Header[] arg1, byte[] arg2) {

 69                 Log.i("ace", "post ok..");

 70             }

 71 

 72             public void onFailure(int arg0, Header[] arg1, byte[] arg2,

 73                     Throwable arg3) {

 74                 arg3.printStackTrace();

 75             }

 76         });

 77 

 78     }

 79 

 80     private void initImg() {

 81         ImageView img = (ImageView) findViewById(R.id.img);

 82         img.setImageBitmap(getImg("orca.jpg"));//assets目录下文件名

 83     }

 84 

 85     //获取图片的Bitmap对象

 86     private Bitmap getImg(String file) {

 87         Bitmap bmp = null;

 88         //获取AssetsMng对象

 89         AssetManager am = getResources().getAssets();

 90         try {

 91             //打开文件,返回输入流

 92             InputStream is = am.open(file);

 93             //Bitmap工厂解码输入流,得到bmp对象

 94             bmp = BitmapFactory.decodeStream(is);

 95             is.close();

 96         } catch (Exception e) {

 97             e.printStackTrace();

 98         }

 99         return bmp;

100     }

101 

102 }

服务器端:

 1 package action;

 2 

 3 import java.io.FileOutputStream;

 4 import java.io.IOException;

 5 import java.io.OutputStream;

 6 import java.io.PrintWriter;

 7 

 8 import javax.servlet.ServletException;

 9 import javax.servlet.http.HttpServlet;

10 import javax.servlet.http.HttpServletRequest;

11 import javax.servlet.http.HttpServletResponse;

12 

13 import sun.misc.BASE64Decoder;

14 

15 

16 

17 

18 public class UploadImg extends HttpServlet {

19 

20     private static final long serialVersionUID = -8236824851962797021L;

21 

22     public void doGet(HttpServletRequest request, HttpServletResponse response)

23             throws ServletException, IOException {

24         response.setContentType("text/html");

25         doPost(request, response);

26     }

27 

28     public void doPost(HttpServletRequest request, HttpServletResponse response)

29             throws ServletException, IOException {

30         

31         System.out.println("do post..");

32         String imgStr = request.getParameter("img");

33         //将字符串解码为字节数组

34         byte[] imgByte = new BASE64Decoder().decodeBuffer(imgStr);

35         //新建文件输出流

36         OutputStream os = new FileOutputStream("E:\\up.jpg");

37         //输出流写入字节数组

38         os.write(imgByte);

39         os.close();

40         

41         PrintWriter out = response.getWriter();

42         out.flush();

43         out.close();

44     }

45 

46 }