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;  
    }