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Android 基础day05

Android 基础day05

作者: 键盘瞎 | 来源:发表于2016-08-08 22:12 被阅读31次

    Android基础网络第二天

    1 post方式提交数据乱码的解决

    一般在公司开发客户端和服务端的编码要保持一致。
    android端的默认编码是utf-8;
    
    做url请求时需要对参数进行URLEncode编码.
    
    URL url = new URL("http://192.168.13.83:8080/itheima74/servlet/LoginServlet?username="+URLEncoder.encode(username)+"&pwd="+URLEncoder.encode(password));
    
    
    connection.setDoOutput(true);
    connection.getOutputStream().write(parmes.getBytes());
    

    2 get方式提交数据乱码解决

    URLEncode
    

    3 httpclient方式提交数据到服务器

     HttpClient:
    
    get方式:
            //使用HttpClient请求服务器将用户密码发送服务器验证
                try{
                String path = "http://192.168.13.83:8080/itheima74/servlet/LoginServlet?username="+URLEncoder.encode(username,"utf-8")+"&pwd="+URLEncoder.encode(password,"utf-8");
                //1.创建一个httpClient对象
                HttpClient httpclient = new DefaultHttpClient();
                
                //2.设置请求的方式
                HttpGet httpget = new HttpGet(path);
                //3.执行一个http请求
                HttpResponse response = httpclient.execute(httpget);
                //4.获取请求的状态码,
                StatusLine statusLine = response.getStatusLine();
                int code = statusLine.getStatusCode();
                
                //5.判断状态码后获取内容
                if(code == 200){
                    HttpEntity entity = response.getEntity();//获取实体内容,中封装的有http请求返回的流信息
                    InputStream inputStream = entity.getContent();
                    //将流信息转换成字符串
                    String result = StreamUtils.streamToString(inputStream);
                    
                    Message msg = Message.obtain();
                    msg.what = 1;
                    msg.obj = result;
                    handler.sendMessage(msg);
                }
                
                }catch (Exception e) {
                    e.printStackTrace();
                }
    post方式:
    
    
            //使用UrlConncetion请求服务器将用户密码发送服务器验证
                try{
                        String path = "http://192.168.13.83:8080/itheima74/servlet/LoginServlet";
                        //1.创建一个httpclient对象
                        HttpClient httpclient = new DefaultHttpClient();
                        //2.创建一个请求方式
                        HttpPost httppost = new HttpPost(path);
                        //创建集合封装数据
                        ArrayList<BasicNameValuePair> arrayList = new ArrayList<BasicNameValuePair>();
                        BasicNameValuePair nameValuePair = new BasicNameValuePair("username",username);
                        arrayList.add(nameValuePair);
                        BasicNameValuePair nameValuePair1 = new BasicNameValuePair("pwd",password);
                        arrayList.add(nameValuePair1);
                        
                        //创建一个Entity
                        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(arrayList, "utf-8");
                        //设置请求时的内容
                        httppost.setEntity(entity);
                        
                        //3.执行一个请求,返回一个response对象
                        HttpResponse response = httpclient.execute(httppost);
                        //4.获取状态码
                        int code = response.getStatusLine().getStatusCode();
                        //5.判断并获取内容
                        if(code == 200){
                            HttpEntity entity1 = response.getEntity();//获取实体内容,中封装的有http请求返回的流信息
                            InputStream inputStream = entity1.getContent();
                            //将流信息转换成字符串
                            String result = StreamUtils.streamToString(inputStream);
                            Message msg = Message.obtain();
                            msg.what = 2;
                            msg.obj = result;
                            handler.sendMessage(msg);
                        }
    
                }catch (Exception e) {
                    e.printStackTrace();
                }
    

    4开源项目get post 方式提交 (asyncHttpClient)

        get方式:
    
    
                    public static void requestNetForGetLogin(final Context context,final Handler handler ,final String username, final String password) {
                //使用HttpClient请求服务器将用户密码发送服务器验证
                try{
                String path = "http://192.168.13.83:8080/itheima74/servlet/LoginServlet?username="+URLEncoder.encode(username,"utf-8")+"&pwd="+URLEncoder.encode(password,"utf-8");
        
                //创建一个AsyncHttpClient对象
                AsyncHttpClient asyncHttpClient = new AsyncHttpClient();
                asyncHttpClient.get(path, new AsyncHttpResponseHandler() {
                    
                    @Override
                    public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
                        //statusCode:状态码    headers:头信息  responseBody:返回的内容,返回的实体
                        //判断状态码
                        if(statusCode == 200){
                            //获取结果
                            try {
                                String result = new String(responseBody,"utf-8");
                                Toast.makeText(context, result, 0).show();
                            } catch (UnsupportedEncodingException e) {
                                // TODO Auto-generated catch block
                                e.printStackTrace();
                            }
                        }
                    }
                    
                    @Override
                    public void onFailure(int statusCode, Header[] headers,
                            byte[] responseBody, Throwable error) {
                        
                        System.out.println("...............onFailure");
                        
                    }
                });
                }catch (Exception e) {
                    e.printStackTrace();
                }
    }
    
    
        post方式:
    
    
                    String path = "http://192.168.13.83:8080/itheima74/servlet/LoginServlet";
    
            AsyncHttpClient asyncHttpClient = new AsyncHttpClient();
            RequestParams params = new RequestParams();
            params.put("username", username);
            params.put("pwd", password);
            
            //url:   parmas:请求时携带的参数信息   responseHandler:是一个匿名内部类接受成功过失败
            asyncHttpClient.post(path, params, new AsyncHttpResponseHandler() {
                
                @Override
                public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
                    //statusCode:状态码    headers:头信息  responseBody:返回的内容,返回的实体
                    
                    //判断状态码
                    if(statusCode == 200){
                        //获取结果
                        try {
                            String result = new String(responseBody,"utf-8");
                            Toast.makeText(context, result, 0).show();
                        } catch (UnsupportedEncodingException e) {
                            // TODO Auto-generated catch block
                            e.printStackTrace();
                        }
                    }
                    
                }
                
                @Override
                public void onFailure(int statusCode, Header[] headers,
                        byte[] responseBody, Throwable error) {
                    
                }
            });
    

    5 文件上传的操作

        使用第三方utils做文件上传。
            
    public void fileupload(View v){
        try{
        EditText et_filepath = (EditText) findViewById(R.id.et_filepath);
        //获取输入的文件地址
        String filepath = et_filepath.getText().toString().trim();
        
        //使用开源Utils做上传操作
        AsyncHttpClient asyncHttpClient = new AsyncHttpClient();
        
        RequestParams params = new RequestParams();
        params.put("filename", new File(filepath));
        //url : 请求服务器的url
        asyncHttpClient.post("http://192.168.13.83:8080/itheima74/servlet/UploaderServlet", params, new AsyncHttpResponseHandler() {
            
            @Override
            public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
                if(statusCode == 200){
                    Toast.makeText(MainActivity.this, "上传成功", 0).show();
                }
            }
            @Override
            public void onFailure(int statusCode, Header[] headers,
                    byte[] responseBody, Throwable error) {
            }
        });
        
        }catch (Exception e) {
            e.printStackTrace();
        }
    }
    

    6 多线程加速下载的原理

        1.线程越多下载越快?? 不是。 与 本地网络带宽, 服务器资源的带宽 有关
        2.迅雷:3-5个。
    
        多线程下载的步骤:
    
        1.要知道服务端资源的大小。
        
            通过URLConnection请求服务器url获取。
            UrlConnection.getContentLength();//资源的大小
            
        2.在本地创建一个与服务端资源同样大小的一个文件(占位)
                //file :  文件; mode:文件的模式,rwd:直接写到底层设备,硬盘
                RandomAccessFile randomfile =new RandomAccessFile(File file,String mode)
                    
                randomfile.setLength(long size);//创建一个文件和服务器资源一样大小
                
        3.要分配每个线程下载文件的开始位置和结束位置。
                
        4.开启线程去执行下载
                通过UrlConnection下载部分资源。
                注意:
                 1.需要Range头,key:Range   value:bytes:0-499 
                        urlconnection.setRequestPropety("Range","bytes:0-499")
                 2.需要设置每个线程在本地文件的保存的开始位置
                        RandomAccessFile randomfile =new RandomAccessFile(File file,String mode)
                        randomfile.seek(int startPostion);//本次线程下载保存的开始位置。
                        
        5.要知道每个线程下载完毕。
    

    7 javase 多线程下载

    8 多线程断点续传实现

    9 Android版本多线程下载

            安智: sdcard没有判断。uc
    

    10 开源项目实现多线程下载 (xutils)

        public void download(View v){
        EditText et_url = (EditText) findViewById(R.id.et_url);
        String url = et_url.getText().toString().trim();
        //1.创建httpUtils对象
        HttpUtils httpUtils = new HttpUtils();
        //2.调用download方法  url:下载的地址  target:下载的目录   callback:回调 
        httpUtils.download(url, "/sdcard/feiqiu/feiq.exe", new RequestCallBack<File>() {
            @Override
            public void onLoading(long total, long current, boolean isUploading) {
                System.out.println("total:"+total+";current:"+current);
                super.onLoading(total, current, isUploading);
            }
            @Override
            public void onSuccess(ResponseInfo<File> responseInfo) {
                System.out.println(responseInfo.result);
            }
            @Override
            public void onFailure(HttpException error, String msg) {
                // TODO Auto-generated method stub
                
            }
        });
    }
    

    2天网络内容大复习

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