android-网络请求

java.net

Get请求

 

try {
            URL url = new URL("");    
            URLConnection connection = url.openConnection();
            HttpURLConnection httpConnection = (HttpURLConnection)connection;
            httpConnection.setConnectTimeout(30 * 1000);
            httpConnection.connect();

            if (httpConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                //这里使用的byte[]就相当于iOS中的NSData
                byte[] buffer = new byte[1024];
                ByteArrayOutputStream outStream = new ByteArrayOutputStream();
                InputStream inStream = httpConnection.getInputStream();
                int len = 0;
                while ((len = inStream.read(buffer)) != -1) { 
                    //inputStream是写入了内存后的内容，比如从网络访问回来的结果或从硬盘中读取数据。outputStream是从内存中输出出去的内容，比如输出到网络或硬盘。
                    //这个while循环就是从网络中按字节为单位地将数据获取，inputStream的read是将网络获取下来的数据读到buffer并返回数据字节数。
                    //若果上次读入数据成功且是有数据返回，则继续申请获取数据，用outStream的write，并将上一次读入操作得到的字节数、缓存变量传入，让目标源知道这次该返回些什么数据。
                    outStream.write(buffer, 0, len);  
                }  
                inStream.close();  
                System.out.println(new String(outStream.toByteArray()));
            }
            httpConnection.disconnect();
        } catch (Exception e) {
            System.out.println("get"+e.getLocalizedMessage());
        }

 

Post请求

try {
            String path = "https://reg.163.com/logins.jsp";
            String params = "id=" + URLEncoder.encode("helloworld", "UTF-8")
                    + "&pwd=" + URLEncoder.encode("android", "UTF-8");
            // 请求的参数转换为byte数组
            byte[] postData = params.getBytes();
            
            URL url = new URL(path);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setConnectTimeout(30 * 1000);
            // Post请求必须设置允许输出
            urlConnection.setDoOutput(true);
            urlConnection.setUseCaches(false);
            urlConnection.setRequestMethod("POST");
            urlConnection.setInstanceFollowRedirects(true);
            urlConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencode");
            urlConnection.connect();
            
            //发送请求参数
            DataOutputStream dos = new DataOutputStream(urlConnection.getOutputStream());
            dos.write(postData);
            dos.flush();
            dos.close();
            
            if (urlConnection.getResponseCode() == HttpURLConnection.HTTP_OK) {
                //xml解析（DOM）
                InputStream in = urlConnection.getInputStream();
                DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
                DocumentBuilder db = dbf.newDocumentBuilder();
                Document dom = db.parse(in);
                Element docEle = (Element) dom.getDocumentElement();
                NodeList nl = docEle.getElementsByTagName("input");
                if (nl != null && nl.getLength()>0) {
                    for (int i = 0; i < nl.getLength(); i++) {
                        Element input = (Element) nl.item(i);
                        String name = input.getAttribute("name");
                        System.out.println("XML parse excice result : 163's input feild name");
                    }
                } 
                
                //普通字节流获取
//                ByteArrayOutputStream outStream = new ByteArrayOutputStream();
//                InputStream inStream = urlConnection.getInputStream();
//                int len = 0;
//                byte[] buffer = new byte[1024];
//                while ((len = inStream.read(buffer)) != -1) {  
//                    outStream.write(buffer, 0, len);  
//                }  
//                inStream.close();  
//                System.out.println(new String(outStream.toByteArray()));
                
            }
        } catch (Exception e) {
            System.out.println("post"+e.getLocalizedMessage());
        }

org.apache.http

Get请求

try {
            String path = "";
            HttpGet httpGet = new HttpGet(path);
            HttpClient httpClient = new DefaultHttpClient();
            HttpResponse httpResp = httpClient.execute(httpGet);
            if (httpResp.getStatusLine().getStatusCode() == HttpURLConnection.HTTP_OK) {
                String result = EntityUtils.toString(httpResp.getEntity(),"UTF-8");
                //JSON解析
                String message = new JSONObject(result).getString("message");
                System.out.println("HttpGet "+"message:"+message);
            }
        } catch (Exception e) {
            System.out.println("HttpGet "+e.getLocalizedMessage());
        }

Post请求

try {
            String path = "";
            HttpPost httpPost = new HttpPost(path);
            // Post参数
            List<NameValuePair> params = new ArrayList<NameValuePair>();
            params.add(new BasicNameValuePair("id", "helloworld"));
            params.add(new BasicNameValuePair("pwd", "android"));
            // 设置字符集
            HttpEntity entity = new UrlEncodedFormEntity(params, HTTP.UTF_8);
            // 设置参数实体
            httpPost.setEntity(entity);
            HttpClient httpClient = new DefaultHttpClient();
            HttpResponse httpResp = httpClient.execute(httpPost);
            if (httpResp.getStatusLine().getStatusCode() == HttpURLConnection.HTTP_OK) {
                String result = EntityUtils.toString(httpResp.getEntity(), "UTF-8");
            }
        } catch (Exception e) {
            System.out.println("HttpPost "+e.getLocalizedMessage());
        }