HttpURLConnection和HttpClient

URLConnection

String urlAddress = "http://192.168.1.102:8080/AndroidServer/login.do";  
    URL url;  
    HttpURLConnection uRLConnection;  
    public UrlConnectionToServer(){  
  
    }  
    //向服务器发送get请求
    public String doGet(String username,String password){  
        String getUrl = urlAddress + "?username="+username+"&password="+password;  
        try {  
            url = new URL(getUrl);  
            uRLConnection = (HttpURLConnection)url.openConnection();  
            InputStream is = uRLConnection.getInputStream();  
            BufferedReader br = new BufferedReader(new InputStreamReader(is));  
            String response = "";  
            String readLine = null;  
            while((readLine =br.readLine()) != null){  
                //response = br.readLine();  
                response = response + readLine;  
            }  
            is.close();  
            br.close();  
            uRLConnection.disconnect();  
            return response;  
        } catch (MalformedURLException e) {  
            e.printStackTrace();  
            return null;  
        } catch (IOException e) {  
            e.printStackTrace();  
            return null;  
        }  
    }  
      
    //向服务器发送post请求
    public String doPost(String username,String password){  
        try {  
            url = new URL(urlAddress);  
            uRLConnection = (HttpURLConnection)url.openConnection();  
            uRLConnection.setDoInput(true);  
            uRLConnection.setDoOutput(true);  
            uRLConnection.setRequestMethod("POST");  
            uRLConnection.setUseCaches(false);  
            uRLConnection.setInstanceFollowRedirects(false);  
            uRLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");  
            uRLConnection.connect();  
              
            DataOutputStream out = new DataOutputStream(uRLConnection.getOutputStream());  
            String content = "username="+username+"&password="+password;  
            out.writeBytes(content);  
            out.flush();  
            out.close();  
              
            InputStream is = uRLConnection.getInputStream();  
            BufferedReader br = new BufferedReader(new InputStreamReader(is));  
            String response = "";  
            String readLine = null;  
            while((readLine =br.readLine()) != null){  
                //response = br.readLine();  
                response = response + readLine;  
            }  
            is.close();  
            br.close();  
            uRLConnection.disconnect();  
            return response;  
        } catch (MalformedURLException e) {  
            e.printStackTrace();  
            return null;  
        } catch (IOException e) {  
            e.printStackTrace();  
            return null;  
        }  
    }  

HTTPClient

String urlAddress = "http://192.168.1.102:8080/qualityserver/login.do";  
public HttpClientServer(){  
          
 }  
      
public String doGet(String username,String password){  
    String getUrl = urlAddress + "?username="+username+"&password="+password;  
    HttpGet httpGet = new HttpGet(getUrl);      //创建get方法实例
    HttpParams hp = httpGet.getParams();       //设置参数
    hp.getParameter("true");  
    //hp.  
    //httpGet.setp  
    HttpClient hc = new DefaultHttpClient();     //单例模式，类似于只有一个标签页的浏览器
    try {  
        HttpResponse ht = hc.execute(httpGet);    //执行get方法获得http实例对象
        if(ht.getStatusLine().getStatusCode() == HttpStatus.SC_OK){       //可以直接写200， SC_OK = State Code OK
            HttpEntity he = ht.getEntity();       // 获得实体，BasicHttpEntity这个类就是一个输入流的内容包装类，包装内容的相关的编码格式，长度等 
            InputStream is = he.getContent();  //获得实体的内容，即响应数据
            BufferedReader br = new BufferedReader(new InputStreamReader(is));  
            String response = "";  
            String readLine = null;  
            while((readLine =br.readLine()) != null){  
                //response = br.readLine();  
                response = response + readLine;  
            }  
            
            br.close(); 
            is.close();
              
            //String str = EntityUtils.toString(he);  
            System.out.println("========="+response);  
            return response;  
        }else{  
            return "error";  
        }  
    } catch (ClientProtocolException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
        return "exception";  
    } catch (IOException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
        return "exception";  
    }      
}  
  


public String doPost(String username,String password){  
    //String getUrl = urlAddress + "?username="+username+"&password="+password;  
    HttpPost httpPost = new HttpPost(urlAddress);   //创建post方法实例
    List params = new ArrayList();  
    NameValuePair pair1 = new BasicNameValuePair("username", username);   //名称值对，POST方法中常见
    NameValuePair pair2 = new BasicNameValuePair("password", password);  
    params.add(pair1);  
    params.add(pair2);  
      
    HttpEntity he;  
    try {  
        he = new UrlEncodedFormEntity(params, "gbk");  
        httpPost.setEntity(he);  
          
    } catch (UnsupportedEncodingException e1) {  
        // TODO Auto-generated catch block  
        e1.printStackTrace();  
    }   
      
    HttpClient hc = new DefaultHttpClient();  
    try {  
        HttpResponse ht = hc.execute(httpPost);  
        //连接成功  
        if(ht.getStatusLine().getStatusCode() == HttpStatus.SC_OK){  
            HttpEntity het = ht.getEntity();  
            InputStream is = het.getContent();  
            BufferedReader br = new BufferedReader(new InputStreamReader(is));  
            String response = "";  
            String readLine = null;  
            while((readLine =br.readLine()) != null){  
                //response = br.readLine();  
                response = response + readLine;  
            }  
            is.close();  
            br.close();  
              
            //String str = EntityUtils.toString(he);  
            System.out.println("=========&&"+response);  
            return response;  
        }else{  
            return "error";  
        }  
    } catch (ClientProtocolException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
        return "exception";  
    } catch (IOException e) {  
        // TODO Auto-generated catch block  
        e.printStackTrace();  
        return "exception";  
    }     
}  

（摘自：http://www.cnblogs.com/devinzhang/archive/2012/01/17/2325092.html）