[转]android网络连接

本文转自：http://dev.10086.cn/cmdn/wiki/index.php?doc-view-3685.html

一：HttpURLConnection 

URL sourceUrl;
String fileName ="";

        try {
            sourceUrl = new URL("网址");
            fileName = sourceUrl.getFile();
            fileName = fileName.substring(fileName.lastIndexOf('/') + 1);
            fileName = "/sdcard/"+(new Date()).getTime()+fileName;
             /*创建临时文件
                File myTempFile = File.createTempFile("temfile",                                 "."+"mp3");//文件扩展名
         记录临时文件名
        currentTempFilePath = myTempFile.getAbsolutePath();
              */
            FileOutputStream fos = new FileOutputStream(fileName);
            int read = 0;
            byte[] buffer = new byte[512];

            HttpURLConnection conn = (HttpURLConnection) sourceUrl.openConnection();
            conn.setDoInput(true);
            conn.connect();
            int length = conn.getContentLength();

            InputStream is = conn.getInputStream();

            do{
                 read = is.read(buffer);
                 if(read > 0){
                      fos.write(buffer, 0, read);
                 }
            }while(read != -1);

        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return;
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
            return;
        }
        if(fileName !=""){
            File file = new File(fileName);
            if (file.exists()){
                //根据filename，操作这个文件
            }
        }

URL imageUrl = null;
   Bitmap bitmap = null;
   try
   {
     /* new URL对象将网址传入 */
     imageUrl = new URL(uriPic);
   }
   catch (MalformedURLException e)
   {
     e.printStackTrace();
   }
   try
   {
     /* 取得连接 */
     HttpURLConnection conn = (HttpURLConnection) imageUrl
         .openConnection();
     conn.connect();
     /* 取得返回的InputStream */
     InputStream is = conn.getInputStream();
     mTextView1.setText(conn.getResponseCode()+"="+conn.getResponseMessage());
     /* 将InputStream变成Bitmap */
     bitmap = BitmapFactory.decodeStream(is);
     /* 关闭InputStream */
     is.close();
   }
   catch (IOException e)
   {
     e.printStackTrace();
   }

处理文字数据 

/* 将InputStream转成Reader */
      BufferedReader in = new BufferedReader(new InputStreamReader(
          conn.getInputStream()));
      String inputLine;
      /* 图文件路径 */
      String uriPic = "";
      /* 一行一行读取 */
      while ((inputLine = in.readLine()) != null)
      {
        uriPic += inputLine;
      }

URLConnection 获取图片 

URL aryURI = new URL(myImageURL[position]);

URLConnection conn = aryURI.openConnection();
conn.connect();

InputStream is = conn.getInputStream();

Bitmap bm = BitmapFactory.decodeStream(is);

is.close();

imageView.setImageBitmap(bm);

注:URL可以直接InputStream is = URL.openStream(); 

XML 的应用 

URL url = new URL(ConstData.queryString+cityParamString);

                    SAXParserFactory spf = SAXParserFactory.newInstance();
                    SAXParser sp = spf.newSAXParser();


                    XMLReader xr = sp.getXMLReader();

                    myHandler gwh = new myHandler();
                    xr.setContentHandler(gwh);

                    InputStreamReader isr =new InputStreamReader(url.openStream(),"GBK");
                    InputSource is=new InputSource(isr);

                    xr.parse(is);

向服务器上传文件 

private void uploadFile()
  {
    String end = "\r\n";
    String twoHyphens = "--";
    String boundary = "*****";
    try
    {
      URL url =new URL(actionUrl);
      HttpURLConnection con=(HttpURLConnection)url.openConnection();
      /* 允许Input、Output，不使用Cache */
      con.setDoInput(true);
      con.setDoOutput(true);
      con.setUseCaches(false);
      /* 设置传送的method=POST */
      con.setRequestMethod("POST");
      /* setRequestProperty */
      con.setRequestProperty("Connection", "Keep-Alive");
      con.setRequestProperty("Charset", "UTF-8");
      con.setRequestProperty("Content-Type",
                         "multipart/form-data;boundary="+boundary);
      /* 设置DataOutputStream */
      DataOutputStream ds =
        new DataOutputStream(con.getOutputStream());
      ds.writeBytes(twoHyphens + boundary + end);
      ds.writeBytes("Content-Disposition: form-data; " +
                    "name=\"file1\";filename=\"" +
                    newName +"\"" + end);
      ds.writeBytes(end);

      /* 取得文件的FileInputStream */
      FileInputStream fStream = new FileInputStream(uploadFile);
      /* 设置每次写入1024bytes */
      int bufferSize = 1024;
      byte[] buffer = new byte[bufferSize];

      int length = -1;
      /* 从文件读取数据至缓冲区 */
      while((length = fStream.read(buffer)) != -1)
      {
        /* 将资料写入DataOutputStream中 */
        ds.write(buffer, 0, length);
      }
      ds.writeBytes(end);
      ds.writeBytes(twoHyphens + boundary + twoHyphens + end);

      /* close streams */
      fStream.close();
      ds.flush();

      /* 取得Response内容 */
      InputStream is = con.getInputStream();
      int ch;
      StringBuffer b =new StringBuffer();
      while( ( ch = is.read() ) != -1 )
      {
        b.append( (char)ch );
      }
      /* 将Response显示于Dialog */
      showDialog(b.toString().trim());
      /* 关闭DataOutputStream */
      ds.close();
    }
    catch(Exception e)
    {
      showDialog(""+e);
    }
  }

DefaultHttpClient 
用户登录验证 

/* 账号：david */
   /* 密码：1234 */
   String uriAPI = "http://www.dubblogs.cc:8751/Android/Test/API/TestLogin/index.php";
   String strRet = "";

   try
   {
     DefaultHttpClient httpclient = new DefaultHttpClient();
     HttpResponse response;
     HttpPost httpost = new HttpPost(uriAPI);
     List <NameValuePair> nvps = new ArrayList <NameValuePair>();
     nvps.add(new BasicNameValuePair("uid", strUID));
     nvps.add(new BasicNameValuePair("upw", strUPW));

     httpost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));

     response = httpclient.execute(httpost);
     HttpEntity entity = response.getEntity();
     //entity = response.getEntity();

     Log.d(TAG, "HTTP POST getStatusLine: " + response.getStatusLine());

     /* HTML POST response BODY */
     strRet = EntityUtils.toString(entity);
     Log.i(TAG, strRet);
     strRet = strRet.trim().toLowerCase();

     List<cookie> cookies = httpclient.getCookieStore().getCookies();
     if (entity != null)
     {
       entity.consumeContent();
     }

     Log.d(TAG, "HTTP POST Initialize of cookies.");
     cookies = httpclient.getCookieStore().getCookies();
     if (cookies.isEmpty())
     {
       Log.d(TAG, "HTTP POST Cookie not found.");
       Log.i(TAG, entity.toString());
     }
     else
     {
       for (int i = 0; i < cookies.size(); i++)
       {
         Log.d(TAG, "HTTP POST Found Cookie: " + cookies.get(i).toString());
       }
     }


     if(strRet.equals("y"))
     {
       Log.i("TEST", "YES");
       return true;
     }
     else
     {
       Log.i("TEST", "NO");
       return false;
     }
   }
   catch(Exception e)
   {
     e.printStackTrace();
     return false;
   }