Android使用HttpURLConnection和HttpClient请求服务器数据

HTTP提交方式有多种，最常用的的就是POST和GET，另外还有PUT、DELETE、HEAD。好久没学习了，Android这边又生疏了，近三个月来毫无建树，整天都忙也没学到什么东西，打算继续学习Android！

1.0 HttpURLConnection

1.1 HttpURLConnection:GET

public boolean loginByGet(String path, String username , String password) throws Exception{                    String url_path = path +"?username=" + URLEncoder.encode(username, "utf-8") + "&password="+password;                    URL url = new URL(url_path);          HttpURLConnection conn = (HttpURLConnection) url.openConnection();                    conn.setRequestMethod("GET");          conn.setConnectTimeout(5000);          if(conn.getResponseCode() == 200){              return true;          }                              return false;      }

1.2 HttpURLConnection:POST

public boolean loginByPost(String path,String username , String password) throws Exception{            System.out.println("LoginService的loginByPost()");          URL url = new URL(path);          HttpURLConnection conn = (HttpURLConnection) url.openConnection();                    conn.setRequestMethod("POST");          conn.setConnectTimeout(5000);                    String value = "username=" + username +"&" + "password=" +password;          byte[] entity = value.getBytes();                     conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");          conn.setRequestProperty("Content-Length", entity.length + "");                    conn.setDoOutput(true);          OutputStream os = conn.getOutputStream();          os.write(entity);                    if(conn.getResponseCode() == 200){              return true;          }                    return false;      }

2.0 HttpClient

2.1 HttpClient:GET

public boolean loginByHttpClientGet(String path,String username , String password) throws Exception{                              String value = path + "?username=" + username +"&password=" + password;           HttpClient httpClient =  new DefaultHttpClient();          HttpGet httpGet = new HttpGet(value);                    HttpResponse httpResponse = httpClient.execute(httpGet);          if(httpResponse.getStatusLine().getStatusCode() == 200){              return true;          }                    return false;      }

2.2 HttpClient:POST

public boolean loginByHttpClientPost(String path,String username , String password)throws Exception{                    HttpClient httpClient = new DefaultHttpClient();          HttpPost httpPost = new HttpPost(path);                    List<NameValuePair> parameters = new ArrayList<NameValuePair>();          parameters.add(new BasicNameValuePair("username", username));          parameters.add(new BasicNameValuePair("password", password));                    UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters,"utf-8");          httpPost.setEntity(entity);          HttpResponse httpResponse = httpClient.execute(httpPost);          if(httpResponse.getStatusLine().getStatusCode() == 200){              return true;          }                    return false;      }

1.0 HttpURLConnection

1.1 HttpURLConnection:GET

1.2 HttpURLConnection:POST

2.0 HttpClient

2.1 HttpClient:GET

2.2 HttpClient:POST

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