Java HTTP 网络请求库框架的使用

JAVA中只有有几种HttpURLConnection 和HttpClient

在Android也可以使用，但是Android封装了2种新的网络请求方式：分别是volley和android-async-http

第一种：HttpURLConnection：

GET方式：

URL url = new URL("http://fanyi.youdao.com/openapi.do?keyfrom=fadabvaa&key=522071532&type=data&doctype=xml&version=1.1&q=Americans");URLConnection connection = url.openConnection();//connection.addRequestProperty("encoding", "UTF-8");InputStream is =connection.getInputStream();//字符流InputStreamReader isr =new InputStreamReader(is,"UTF-8");//字节流BufferedReader bfr =new BufferedReader(isr);String line;StringBuffer sb =new StringBuffer();while ((line=bfr.readLine())!=null) {sb.append(line);}is.close();isr.close();bfr.close();System.out.println(sb.toString());POST方式：

URL url =new URL("http://fanyi.youdao.com/openapi.do");HttpURLConnection conection=(HttpURLConnection) url.openConnection();conection.addRequestProperty("encding", "UTF-8");conection.setDoOutput(true);conection.setDoInput(true);conection.setRequestMethod("POST");//输出流可以采用匿名方式 OutputStream os =conection.getOutputStream();OutputStreamWriter osw =new OutputStreamWriter(os);BufferedWriter bw =new BufferedWriter(osw);bw.write("keyfrom=fadabvaa&key=522071532&type=data&doctype=xml&version=1.1&q=China");bw.flush(); //输入流可以采用匿名方式 InputStream is =conection.getInputStream();InputStreamReader isr =new InputStreamReader(is);BufferedReader br =new BufferedReader(isr);String line;StringBuffer sb =new StringBuffer();while ((line =br.readLine())!=null) {sb.append(line);}os.close();osw.close();bw.close();is.close();isr.close();br.close();System.out.println(sb.toString());

第二种是：HttpClient 中的HttpGet：

HttpClient httpclient =HttpClients.createDefault();@Overridepublic void run() {HttpGet get =new HttpGet("http://fanyi.youdao.com/openapi.do?keyfrom=fadabvaa&key=522071532&type=data&doctype=xml&version=1.1&q=Americans");try {HttpResponse response =httpclient.execute(get);HttpEntity entity=response.getEntity();String result =EntityUtils.toString(entity,"UTF-8");System.out.println(result);} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}HttpPost:

HttpClient httpclient = HttpClients.createDefault();@Overridepublic void run() { HttpPost post = new HttpPost("http://fanyi.youdao.com/openapi.do");try {java.util.List parameters=new ArrayList<>();parameters.add(new BasicNameValuePair("keyfrom", "fadabvaa"));parameters.add(new BasicNameValuePair("key", "522071532"));parameters.add(new BasicNameValuePair("type", "data"));parameters.add(new BasicNameValuePair("doctype", "xml"));parameters.add(new BasicNameValuePair("version", "1.1"));parameters.add(new BasicNameValuePair("q", "Americans"));post.setEntity(new UrlEncodedFormEntity(parameters,"UTF-8"));HttpResponse response = httpclient.execute(post);HttpEntity entity = response.getEntity();if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {String result = EntityUtils.toString(entity, "UTF-8");System.out.println(result);}} catch (ClientProtocolException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}第三种Android volley：

GET：

String url = "http://apis.juhe.cn/mobile/get?phone=13666666666&key=335adcc4e891ba4e4be6d7534fd54c5d";StringRequest request =new StringRequest(Request.Method.GET, url, new Response.Listener() {    @Override    public void onResponse(String s) {        Toast.makeText(MainActivity.this, s,                Toast.LENGTH_LONG).show();    }},new Response.ErrorListener(){    @Override    public void onErrorResponse(VolleyError volleyError) {        Toast.makeText(MainActivity.this, "网络请求失败",                Toast.LENGTH_LONG).show();    }});request.setTag("abcGet");MyApplication.queue.add(request);

POST:

StringRequest request = new StringRequest(Method.POST, url,  listener, errorListener) {      @Override      protected Map getParams() throws AuthFailureError {          Map map = new HashMap();          map.put("params1", "value1");          map.put("params2", "value2");          return map;      }  };

第四种：

android-async-http

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