获取Assets目录下的图片显示并上传

package com.jingle.getlocal;

import java.io.ByteArrayOutputStream;

import java.io.InputStream;

import org.apache.http.Header;

import sun.misc.BASE64Encoder;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;


import android.app.Activity;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;

public class MainActivity extends Activity {
    private String UPLOAD_URL = "http://192.168.1.101:8080/Login//servlet/UploadImg";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initImg();
        initBtnUploadImg();

    }

    private void initBtnUploadImg() {
        Button btn = (Button) findViewById(R.id.btn);
        btn.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                uploadImg();
            }
        });
    }

    private void uploadImg() {
        AsyncHttpClient client = new AsyncHttpClient();
        client.setTimeout(3000);
        RequestParams params = new RequestParams();
        //获取Bitmap对象
        Bitmap bmp = getImg("orca.jpg");
        //获取字节数组输出流
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        //压缩Bitmap对象到字节数组输出流
        bmp.compress(Bitmap.CompressFormat.JPEG, 90, baos);
        //将字节数组输出流转为字节数组
        byte[] ba = baos.toByteArray();
        //将字节数组编码成字符串
        String str = new BASE64Encoder().encode(ba);
        params.put("img", str);

        client.post(UPLOAD_URL, params, new AsyncHttpResponseHandler() {
            public void onSuccess(int arg0, Header[] arg1, byte[] arg2) {
                Log.i("ace", "post ok..");
            }

            public void onFailure(int arg0, Header[] arg1, byte[] arg2,
                    Throwable arg3) {
                arg3.printStackTrace();
            }
        });

    }

    private void initImg() {
        ImageView img = (ImageView) findViewById(R.id.img);
        img.setImageBitmap(getImg("orca.jpg"));//assets目录下文件名
    }

    //获取图片的Bitmap对象
    private Bitmap getImg(String file) {
        Bitmap bmp = null;
        //获取AssetsMng对象
        AssetManager am = getResources().getAssets();
        try {
            //打开文件,返回输入流
            InputStream is = am.open(file);
            //Bitmap工厂解码输入流,得到bmp对象
            bmp = BitmapFactory.decodeStream(is);
            is.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
        return bmp;
    }

}

服务器端:

package action;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import sun.misc.BASE64Decoder;




public class UploadImg extends HttpServlet {

    private static final long serialVersionUID = -8236824851962797021L;

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html");
        doPost(request, response);
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        
        System.out.println("do post..");
        String imgStr = request.getParameter("img");
        //将字符串解码为字节数组
        byte[] imgByte = new BASE64Decoder().decodeBuffer(imgStr);
        //新建文件输出流
        OutputStream os = new FileOutputStream("E:\up.jpg");
        //输出流写入字节数组
        os.write(imgByte);
        os.close();
        
        PrintWriter out = response.getWriter();
        out.flush();
        out.close();
    }

}