五、网络多线程
16lz
2021-01-26
Android基础网络第二天
1 get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.final String urlStr = "http://192.168.1.104:8080/itheima74/servlet/LoginServlet?username=" + URLEncoder.encode(username, "utf-8") + "&pwd=" + URLEncoder.encode(password, "utf-8");2 post方式提交数据乱码解决
connection.setDoOutput(true);OutputStream out = connection.getOutputStream();out.write(("username=" + URLEncoder.encode(username, "utf-8") + "&pwd=" + URLEncoder.encode(password, "utf-8")).getBytes());2 服务器端都是这样
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username = new String(request.getParameter("username").getBytes("iso-8859-1"),"utf-8"); String pwd = new String(request.getParameter("pwd").getBytes("iso-8859-1"),"utf-8");}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 arrayList = new ArrayList(); 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
//服务器端public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { boolean isMultipart = ServletFileUpload.isMultipartContent(request); if (isMultipart) { String realpath = request.getSession().getServletContext().getRealPath("/files"); System.out.println("realpath-"+realpath); File dir = new File(realpath); if (!dir.exists()) dir.mkdirs(); FileItemFactory factory = new DiskFileItemFactory(); ServletFileUpload upload = new ServletFileUpload(factory); upload.setHeaderEncoding("UTF-8"); try { List items = upload.parseRequest(request); for (FileItem item : items) { if (item.isFormField()) { String name1 = item.getFieldName(); String value = item.getString("UTF-8"); System.out.println(name1 + "=" + value); } else { item.write(new File(dir, System.currentTimeMillis() + item.getName().substring(item.getName().lastIndexOf(".")))); } } } catch (Exception e) { e.printStackTrace(); }finally{ } } } 使用第三方 AsyncHttpClient 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。uc10 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() { @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 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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