Android Post方式发送信息和获取URL中的图片

需要Internet权限，AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET"/>

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/LinearLayout1"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
        <TextView
            android:text="id:" 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            />
        <EditText 
            android:id="@+id/input_id"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="99"/>
    </LinearLayout>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content">
        <TextView
            android:text="name:" 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            />
        <EditText 
            android:id="@+id/input_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="测试名称"/>
    </LinearLayout>
    <Button
        android:id="@+id/btn01"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:text="发送Post请求" />
    
    <TextView
        android:id="@+id/info"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <Button
        android:id="@+id/btn02"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="获取图片" />
    <ImageView 
        android:id="@+id/img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</LinearLayout>

MainActivity.java

public class MainActivity extends Activity {
    private TextView info=null;
    private Button btn01=null;
    private static final String strURL="http://192.168.1.2/android.ashx";
    private boolean flag=false; //判断是否成功
    
    private EditText input_id=null;
    private EditText input_name=null;
    
    private Button btn02=null;
    private ImageView img=null;
    private static final String imgURL="http://www.baidu.com/img/bdlogo.gif";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        super.setContentView(R.layout.activity_main);
        this.input_id=(EditText)super.findViewById(R.id.input_id);
        this.input_name=(EditText)super.findViewById(R.id.input_name);
        this.info=(TextView)super.findViewById(R.id.info);
        this.btn01=(Button)super.findViewById(R.id.btn01);
        this.btn01.setOnClickListener(new OnClickListenerimpl());
        
        this.img=(ImageView)super.findViewById(R.id.img);
        this.btn02=(Button)super.findViewById(R.id.btn02);
        this.btn02.setOnClickListener(new OnClickListenerimpl());
    }
    
    private class OnClickListenerimpl implements OnClickListener{

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            switch (v.getId()) {
            case R.id.btn01:
                try {
                    HttpPost request=new HttpPost(strURL);
                    List<NameValuePair> params=new ArrayList<NameValuePair>();
                    params.add(new BasicNameValuePair("id", input_id.getText().toString()));
                    params.add(new BasicNameValuePair("name", input_name.getText().toString()));
                    request.setEntity(new UrlEncodedFormEntity(params,HTTP.UTF_8));
                    HttpResponse response=new DefaultHttpClient().execute(request);
                    if(response.getStatusLine().getStatusCode()!=404){
                        //flag=Boolean.parseBoolean(EntityUtils.toString(response.getEntity()).trim());
                        MainActivity.this.info.setText(EntityUtils.toString(response.getEntity()).trim());
                    }
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                
                break;
            case R.id.btn02:
                System.out.println(">>Btn02");
                try {
                    byte data[] = MainActivity.this.getUrlData();
                    System.out.println(">>data_length:"+data.length);
                    Bitmap bmp=BitmapFactory.decodeByteArray(data, 0, data.length); //二进制到图片
                    MainActivity.this.img.setImageBitmap(bmp);
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                break;
            default:
                break;
            }
        }
        
    }
    public byte[] getUrlData() throws Exception{
        ByteArrayOutputStream bos=null; //内存操作流
        try {
            URL url=new URL(imgURL);
            bos=new ByteArrayOutputStream();
            byte data[] =new byte[1024];
            HttpURLConnection conn=(HttpURLConnection)url.openConnection();
            InputStream input=conn.getInputStream();
            int len =0;
            while ((len=input.read(data))!=-1) {
                bos.write(data,0,len);
            }
            return bos.toByteArray();
        } catch (Exception e) {
            throw e;
        } finally{
            if(bos!=null){
                bos.close();
            }
        }
    }

使用C#的一般处理程序来接收Post来的信息，然后输出的内容会在Android程序上显示

android.ashx.cs

        public void ProcessRequest(HttpContext context)
        {
            context.Response.ContentType = "text/plain";
            int id = string.IsNullOrEmpty(context.Request.Form["id"]) ? 0 : Convert.ToInt32(context.Request.Form["id"]);
            string name = string.IsNullOrEmpty(context.Request.Form["name"]) ? "null" : context.Request.Form["name"].ToString();
            if (id != 0 && name != "null")
            {
                context.Response.Write(string.Format("传递参数的id是{0},传递参数的用户名是{1}", id, name));
            }
            else
            {
                context.Response.Write("参数错误");
            }
            
        }