android网络连接总结

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;
    }

未完待续

评论

1 楼 endual 2012-07-13  

大哥，您好歹第一句话说：记得配置android连接网络的权限哦