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 }
郑重声明:本站内容如果来自互联网及其他传播媒体,其版权均属原媒体及文章作者所有。转载目的在于传递更多信息及用于网络分享,并不代表本站赞同其观点和对其真实性负责,也不构成任何其他建议。